AN12941A PANASONIC
Document overview
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Technical content
Publication date: April 2004 SDC00056AEB 1 AN12941A Audio power IC for notebook PC ■ Overview The AN 12941A is an amplifier IC for stereo speakers which can output 1 W by 8 Ω or 2 W by 4 Ω. The AGC circuit is built-in to prevent the resonance or the vibration by the speaker's energy and the clipping distortion what is called "broken up sound." of the speakers. Also, to reduce power consumption, AN 12941A has a built-in function which automatically detects the input signal and can automatically enter power save mode when there is no signal. ■ Features Speaker amplifier is
1 W × 2-channel: 8 Ω, VCC = 5 V or
2 W × 2-channel: 4 Ω, VCC = 5 V
Built-in AGC circuit Prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker by AGC at excessive input signal (with AGC on/off switch). Built-in automatic power saving function It detects input signals and switches on/off (with the on/off switch for the automatic power saving). Operating supply voltage: V CC 3.0 V to 5.5 V/ VCC_SP 3.0 V to 5.5 V ■ Applications Notebook PC, LCD monitor with speaker ■ Block Diagram 4 Ω to 8 Ω AGC Speaker amplifier AGC L R Automatic power save Standby SW Main signal mute SW Signal automatic detection SW SP power save SW AGC SW AGC on level SW Audio signal detection sensitivity SW Input1 Input2 Input3 Input4 Mix circuit Automatic detection 14.00±0.10 0.20±0.05(0.25) (1.00) 0° to 8° 0.50±0.10 0.15 ±0.05 Seating plane Seating plane (6.90) (5.45) 56 29 281 (2.25) (3.70) 6.10±0.100.10±0.10 8.10±0.201.20 max. (1.00) 0.10 M 0.50 0.10 Area of no resin flash Unit: mm HSOP056-P-0300A (Lead-free package)
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■ Application Circuit Example 2829 10 µF VCC _SP VCC _SP VCC _SP +14 dB 10 µF VCC _SP+14 dB Power Save−16 dBV −16 dBV +4 dBV R-channel SP out 4 Ω to 16 Ω −2 dBV −2 dBV +4 dBV L-channel SP out 4 Ω to 16 Ω −2 dBV −2 dBV SP save on/off Save CTL SP GND +14 dB
36 Control
GND 10 kΩ 0.47 µF Mute Signal Det. Mute 10 kΩ 47 kΩ SP GND +14 dB 0.047 µF 4.7 µF VREF (SP) AGC on/off GND 0.47 µF Det. 0 dB 0 dB −16 dBV −16 dBV 0.47 µF 1 µF 100 kΩ GND +9 dB 0.47 µF HP amplifier L-channel HP out L-channel +3 dB −16 dBV −16 dBV GND+9 dB +3 dB 0 dB −16 dBV −16 dBV VREF Signal on/off 0 dB 0 dB 0 dB 2.4 V −22 dBV −28 dBV VREF 10 kΩ 20 kΩ 0.47 µF HP amplifier R-channel HP out R-channel −22 dBV −28 dBV −22 dBV −28 dBV VREF 20 kΩ 0.47 µF 0.47 µF 1 µF R-channel in Signal on/off STB −16 dBV −22 dBV −16 dBV −22 dBV 10 µF REG VCC −22 dBV −28 dBV Standby −6 dB −22 dBV −28 dBV 0.47 µF Beep −6 dB −6 dB −22 dBV −28 dBV −22 dBV −28 dBV 0.47 µF 0.47 µF 4.7 µF from beep −6 dB −16 dBV −22 dBV −16 dBV −22 dBV VREF −22 dBV −28 dBV L-channel in −16 dBV −22 dBV 0.47 µF −6 dB +3 dB +3 dB 0.47 µF AGCAGC AGC on lebel change Supply voltage 5 V Supply voltage 3.3 V Automatic detection output Audio automatic detection on/off control Audio control volume from PCcard SP gain high/low SW from modem Audio control volume 8
■ Pin Description Pin No. Description Pin No. Description
1 VCC 29 VCC_SP L-channel
2 SP gain high/low SW 30 SP amplifier L-channel negative phase output (−)
3 REG ripple filter pin 31 SP amplifier L-channel negative phase output (−)
4 Input for PCcard 32 SP amplifier L-channel positive phase output (+)
5 Standby on/off control 33 SP amplifier L-channel positive phase output (+)
6 R-channel input 34 GND_SP L-channel
7 Main signal mute on/off control 35 SP power save control
8 VREF R-channel for volume 36 AGC on level control
9 Audio mix amplifier R-channel output 37 GND
10 V olume control signal R-channel input 38 Signal auto detection amplifier R-channel input
11 R-channel output for HP amplifier 39 Signal auto detection mix amplifier
12 Negative feedback pin for alarm mix
amplifier R-channel
40 AGC demodulation pin
13 Alarm mix amplifier R-channel output 41 SP amplifier L-channel input
14 AGC R-channel output 42 GND
15 GND 43 AGC L-channel output
16 SP amplifier R-channel input 44 Alarm mix amplifier L-channel output
17 Signal automatic detection on/off control 45 Negative feedback pin for alarm mix
amplifier L-channel
18 AGC on/off control 46 L-channel output for HP amplifier
19 VREF_SP 47 V olume control signal L-channel input
20 GND 48 Audio mix amplifier L-channel output
21 Demodulation pin for signal automatic detection 49 V oltage output for AGC level change
22 Signal automatic detection output 50 Signal auto detection amplifier L-channel input
23 GND_SP R-channel 51 Signal auto detection mix amplifier
24 SP amplifier R-channel positive phase output (+) 52 L-channel input
25 SP amplifier R-channel positive phase output (+) 53 VREF
26 SP amplifier R-channel negative phase output (−) 54 Input for modem
27 SP amplifier R-channel negative phase output (−) 55 GND
28 VCC_SP R-channel 56 Input for beep
Note) SP: Speaker HP: Headphone REG: Regulator
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■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage *1 VCC 5.75 V VCC_SP 5.75 Supply current ICC Ａ Power dissipation *2 PD 517 mW Operating ambient temperature *3 Topr −20 to +75 °C Storage temperature *3 Tstg −55 to +150 °C Operating ambient atmospheric pressure Popr 1.013 × 105 ± 0.61 × 105 Pa Operating constant gravity Gopr 9 810 m/s2 Operating shock Sopr 4 900 m/s2 Note) *1: The values under the condition the above absolute maximum ratings and the power dissipation. *2: Ta = 75°C, the value under the condition which this device is mounted on a four-layer printed wiring board and in addition its radiation part is soldered. (Reference to ■ Technical Data, • Power dissipation of package HSOP056-P-0300A) *3: Except for the storage temperature and operating ambient temperature, all ratings are for Ta = 25°C. ■ Recommended Operating Range Parameter Symbol Rating Unit Supply voltage VCC 3.0 to 5.5 V VCC_SP* 3.0 to 5.5 Note) *: The values under the condition the above absolute maximum ratings and the power dissipation. ■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Circuit current Circuit current 1A at non-signal (VCC) IVCCA VCC = 3.3 V, at non-signal, Automatic distinction: on 4.4 8.7 13.0 mA Circuit current 2A at non-signal (VCC_SP) IVCCSA VCC = 3.3 V, at non-signal, Automatic distinction: on 400 600 µA Circuit current 1B at non-signal (VCC) IVCCB VCC = 3.3 V , at non-signal, Power save: off at non-automatic distinction 4.8 9.5 14.2 mA Circuit current 2B at non-signal (VCC_SP) IVCCSB VCC = 3.3 V , at non-signal, Power save: off at non-automatic distinction 8.1 16.2 mA Circuit current 1C at non-signal (VCC) IVCCC VCC = 3.3 V , at non-signal, Power save: on at non-automatic distinction 4.1 8.1 12.1 mA Circuit current 2C at non-signal (VCC_SP) IVCCSC VCC = 3.3 V , at non-signal, Power save: on at non-automatic distinction 400 600 µA
■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued) Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Circuit current (continued) Circuit current 1D at non-signal (VCC) IVCCD VCC = 3.3 V , at standby mode 10 50 µA Circuit current 2D at non-signal (VCC_SP) IVCCSD VCC = 3.3 V , at standby mode 10 50 µA Speaker amplifier (Pin 52, pin 6 → pin 24 to pin 27, pin 33 to pin 30) L-channel audio output level VOSPL VIN = −22 dBV , 1 kHz, RL = 8 Ω 2.0 4.0 6.0 dBV R-channel audio output level VOSPR VIN = −22 dBV , 1 kHz, RL = 8 Ω 2.0 4.0 6.0 dBV L-channel audio output distortion THSPL VIN = −22 dBV , 1 kHz, RL = 8 Ω, to THD fifth 0.04 0.5 % R-channel audio output distortion THSPR VIN = −22 dBV , 1 kHz, RL = 8 Ω, to THD fifth 0.04 0.5 % L-channel audio output noise VNSPL At non-signal, RL = 8 Ω, A curve filter −65 −62 dBV R-channel audio output noise VNSPR At non-signal, RL = 8 Ω, A curve filter −74 −68 dBV L-channel maximum output power VM8SPL VIN = 1 kHz, at THD = 10%, RL = 8 Ω to THD fifth, at AGC = off 0.7 1.0 W R-channel maximum output power VM8SPR VIN = 1 kHz, at THD = 10%, RL = 8 Ω to THD fifth, at AGC = off 0.7 1.0 W L-channel maximum output power VM4SPL VIN = 1 kHz, at THD = 10%, RL = 4 Ω to THD fifth, at AGC = off 2.0 W R-channel maximum output power VM4SPR VIN = 1 kHz, at THD = 10%, RL = 4 Ω to THD fifth, at AGC = off 2.0 W Cross talk R-channel → L-channel VCTSPL VIN = −22 dBV , 1 kHz, RL = 8 Ω A curve filter 64 68 dB Cross talk L-channel → R-channel VCTSPR VIN = −22 dBV , 1 kHz, RL = 8 Ω A curve filter 64 68 dB AGC output level VAGSPL VAGSPR VIN = −6 dBV , 1 kHz, RL = 8 Ω A curve filter 5.5 7.0 8.5 dBV Mix amplifier characteristic 1 (Pin 4, pin 54, pin 56 → pin 46, pin 11) L-channel, R-channel output level at beep signal mix VBESPL VBESPR VIN = −10 dBV , 1 kHz, pin 56 input −17 −16 −15 dBV L-channel, R-channel output level at modem signal mix VMDSPL VMDSPR VIN = −10 dBV , 1 kHz, pin 54 input −17 −16 −15 dBV L-channel, R-channel output level at PCcard signal mix VPCSPL VPCSPR VIN = −10 dBV , 1 kHz, pin 4 input −17 −16 −15 dBV Each entry pin max input level VIN = 1 kHz, VIN at THD = 1% 0.6 V[rms] Maximum amplifier output for the HP amplifier VHPMAL VHPMAR VIN = 1 kHz, VIN at THD = 1% 0.3 V[rms]
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■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued) Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Mix amplifier characteristic 2 (continued) (Pin 56, pin 54, pin 52, pin 4, pin 6 → pin 44, pin 13) L-channel, R-channel mix amplifier cross talk in case of signal off VOFSPL VOFSPR VIN = −16 dBV , 1 kHz pins 4, 6, 52, 54, 56: input −81 −75 dBV Signal detection system characteristic (Pin 52, pin 6, pin 54, pin 56, pin 4 → pin 51, pin 39) Pre-amplifier output at L-channel input VSDTL VIN = −46 dBV , 1 kHz −22 −20 −18 dBV Pre-amplifier output at R-channel input VSDTR VIN = −46 dBV , 1 kHz −22 −20 −18 dBV Pre-amplifier output at beep signal input VSDTBE VIN = −46 dBV , 1 kHz −22 −20 −18 dBV Pre-amplifier output at modem signal input VSDTMD VIN = −46 dBV , 1 kHz −22 −20 −18 dBV Pre-amplifier output at PCcard signal input VSDTPC VIN = −46 dBV , 1 kHz −22 −20 −18 dBV Detection level 1 at high sensitivity VSDTTH VIN = 1 kHz −65 −60 −55 dBV Distinction output high level VSDTHI VIN = 1 kHz 2.3 3.3 V Distinction output low level VSDTLO VIN = 1 kHz 0.1 1.0 V Voltage holding mode Entry signal on/off V oltage range holding on V7H 2.0 5.0 V Entry signal on/off V oltage range holding off V7L 0.0 0.8 V AGC on/off V oltage range holding on V18H 2.0 5.0 V AGC on/off V oltage range holding off V18L 0.0 0.8 V Signal automatic detection function V oltage range holding on V17H 2.0 5.0 V Signal automatic detection function V oltage range holding off V17L 0.0 0.8 V Sandby on/off V oltage range holding off V5H 2.0 5.0 V Sandby on/off V oltage range holding on V5L 0.0 0.8 V SP amplifier power save on/off V oltage range holding off V35H 2.0 5.0 V SP amplifier power save on/off V oltage range holding on V35L 0.0 0.8 V
■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued) Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Voltage holding mode (continued) SP gain high/low SW +6 dB/0 dB V oltage range holding +6 dB V2H 2.0 5.0 V SP gain high/low SW +6 dB/0 dB V oltage range holding 0 dB V2L 0.0 0.8 V ■ Control terminal , The mode table Pin No. Pin Name Voltage of Pin Remarks Low High
7 Entry signal on/off Signal off Signal on
18 AGC on/off AGC off AGC on
17 Signal automatic detection function Automatic
5 Standby on/off STB on STB off
35 SP power save on/off Save on
(SP off) Save off (SP on) The power saving operation by pin 35 has priority over any automatic detection
2 SP gain high/low SW 0 dB +6 dB The gain difference is about
Pin No. Pin Name Voltage of Pin 0.5 V to 1.5 V
36 At the time of AGC: on,
It changes on level. On level: −3 dB to +3 dB Note) *: The holding range of control voltage is shown in page 6 to page 7 of ■ Electrical Characteristics. ■ Terminal Equivalent Circuits Pin No. Equivalent Circuits Description Corrugation and Voltage 28, VCC_SP: It is the specifically designed power pin of the speaker amplifier. Pin 28 is for R-channel Pin 29 is for L-channel Because the big electric current flows,it is desirable to separate from the VCC line to the other power pin on the board pattern. DC 5 V
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■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 24, 25, 26, 30, 31, 32, 3.6 kΩ 18 kΩ Pin 31 Pin 30 VCC_SP (5.0 V) Speaker Output: It is output pins of the speaker amplifier. It becomes BTL output. The L-channel positive phase output pin: Pin 32, pin 33 The L-channel negative phase output pin: Pin 30, pin 31 The R-channel positive phase output pin: Pin 24, pin 25 The R-channel negative phase output pin: Pin 26, pin 27 To reduce voltage loss by the wire resistance in maximum output, it makes output 2 pins. Also, when the speaker amplifier saves power, too, DC voltage is maintained. The output impedance: Equal to or less than 10 Ω DC 2.2 V AC 4 dBV Pin 32, pin 33 Pin 24, pin 25 positive Pin 30, pin 31 Pin 26, pin 27 negative 23, GND: It is GND pin for the speaker amplifier. Pin 23 is for R-channel Pin 34 is for L-channel Because the big electric current flows, it is desirable to separate from the GND line to the other GND pin on the board pattern. Also, it isn't connected with the substrate potential in the IC. DC 0 V 2245 kΩ Audio signal automatic detection distinction output: It outputs the distinction result of the audio signal automatic detection circuit. The output form is the open collector output from of the NPN transistor. Therefore, the pull rises and uses for the power by the external resistance (equal to or more than 10 k Ω). Signal's there being: Output high Signal nothing: Output low Open collector output The electric current ability: Equal to or more than 100 µA Signal nothing DC 0 V Signals there being DC 3.3 V
■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage VREG (3.0 V) 90 Ω 90 kΩ Audio automatic detecting detection pin: It connects a condenser for the peak detection. It is the circuit which detects a peak after rectifying the audio signal of the audio signal automatic detection circuit in both waves. By changing a capacity value, the time which the power saving depends on in case of the switchover which is without signal with signal's there being can be changed. Signal less time: Constant current source Signal's there being: Emitter follower The output impedance: About 200 Ω Signal nothing DC 0 V Signals there being DC 2 V 15, 20, 37, 42, GND: It is the GND pin of the signal system. It is connected with the substrate potential of the IC. Pin 15, pin 42 connect with the lead frame of the IC. DC 0 V 133 kΩ 137 kΩ VCC_SP (5.0 V) VREF_SP: It is the standard voltage pin to fix the DC bias of the speaker output. It connects a condenser to remove a ripple. The output impedance: About 60 kΩ DC 2.2 V 45 kΩ 9 kΩ 27 kΩ 63 kΩ 9 kΩ 49-pin (2.4 V) Signal automatic detection function on/off control pin: We change an audio signal automatic detection function in on/off. In case of automatic detection off, it controls power saving by speaker with the manual with the power saving on/off pin. High: Function on Low: Function off The entry impedance: The high impedance DC
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■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 16, 50 kΩ VREF (1.5 V) Pin 16 Speaker amplifier entry: It is the voice input pins of the speaker amplifier. To make offset voltage in power saving on/off changing by the Speaker amplifier amplifier little, it combines capacity. (It makes pop noise small). Pin 16: R-channel SP amplifier entry Pin 41: L-channel SP amplifier entry The entry impedance: About 50 kΩ DC 1.5 V AC −16 dBV 14, 90 Ω VREG (3.0 V) Pin 14 AGC amplifier output: It is the output pin of the AGC circuit to hold an output clip in excessive output of the speaker output. Pin 14: The AGC R-channel output Pin 43: The AGC L-channel output The output impedance: Equal to or less than about 10 Ω DC 1.5 V AC −16 dBV 13, VREG (3.0 V) VREG (3.0 V) Pin 13 Pin 12 18 kΩ12.7 kΩ 9 kΩ Alarm mix amplifier output pins: It is output pins of the mix amplifier to mix an alarm signal and an audio signal. Pin 13: R-channel output Pin 44: L-channel output The output impedance: Equal to or less than about 10 Ω DC 1.5 V AC −25 dBV 12, Alarm mix amplifier negative feedback pins: It is the negative feedback of the mix amplifier to mix an alarm signal and an audio signal. It is possible to adjust in the direction which lowers the gain of the mix amplifier in putting resistance among above mentioned mix amplifier output pins. Pin 12: R-channel negative feedback pin Pin 45: L-channel negative feedback pin The entry impedance: The high impedance DC 1.5 V
■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage VREG (3.0 V) Pin 9 4.6 kΩ 4.6 kΩ Audio signal mix amplifier output pin: It is the output of the mix amplifier to mix a signal from the modem, the beep, the PCcard to an audio signal. Pin 9: The R-channel output Pin 48: The L-channel output The output impedance: Equal to or less than about 10 Ω DC 1.5 V AC −28 dBV 10, Pin 10 VREG (3.0 V) Entry for EVR: It is the amplifier entry to adjust an output level to the HP amplifier. It becomes the entry of the EVR adjustment signal. The entry impedance: The high impedance DC AC −28 dBV 90 kΩ 81 kΩ 126 kΩ 49-pin (2.4 V) Audio signal on/off changing control pin: It is the control pin which changes whether to communicate an audio signal to the amplifier to mix an alarm signal and an audio signal. At the time of off, only an alarm audio is output from the mix amplifier. High: Signal on Low: Signal off The entry impedance: The high impedance DC VREG (3.0 V) 25.2 kΩ 25.2 kΩ VREF (1.5 V) Pin 6 Audio signal input: It enters a main audio signal. Pin 6: R-channel entry Pin 52: L-channel entry The entry impedance: About 45 k Ω DC 1.5V AC −22 dBV
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■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 4 VREG (3.0 V) 25.2 kΩ 25.2 kΩ VREF (1.5 V) PCcard signal entry: It is the entry pin to enter a signal from the PCcard. With the audio signal mix amplifier of the following paragraph, the same signal is entered both by L-channel and R-channel. Also, it has the function which is the same as the beep entry of pin 56, the modem entry by pin 54 completely. The entry impedance: About 45 kΩ DC 1.5V AC −16 dBV 243 kΩ 207 kΩ VCC (3.3 V) VREG (3.0 V) 9 kΩ Ripple removal condenser pin for the regulator: To remove a power ripple with the regulator circuit to create the inner power (VREG), it puts a condenser. The entry impedance: About 100 kΩ DC 1.5 V 90 kΩ 81 kΩ 126 kΩ 49-pin (2.4 V) SP gain high/low CTL: It is the terminal which controls gain 0 dB/+6 dB of SP output. High: +6 dB Low: 0 dB The entry impedance: The high impedance DC 1 VCC : It is the power (VCC) pin to supply the regulator circuit to create the inner power V REG with the voltage. It is separating from VCC_SP of pin 28, pin 29 fully inside. It is desirable to separate as far as it finishes coming out about the P board pattern, too. DC 3.3 V
■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 90 kΩ 270 kΩ
5 Standby on/off changing SW:
It changes whether or not it makes this IC an operation condition or whether or not it makes it a standby. High: The operation condition Low: Standby In that the power changes a connected condition to the standby, the circuit electric current can be almost made The entry impedance: About 80 k Ω Open voltage DC 0 V 25.2 kΩ 25.2 kΩ VREF (1.5 V) Beep input: It is the entry pin to enter beep signal. The same signal is entered both by L-channel and R-channel with the audio signal mix amplifier of the following paragraph. Also, it has the function which is the same as the PCcard signal entry by pin 4, the modem signal entry by pin 54 completely. The entry impedance: About 45 kΩ DC 1.5 V AC −22 dBV 180 kΩ 180 kΩ VREG (3.0 V) VREF: With the pin to fix the bias voltage (the operation point) of the system which the inner power (VREG) works, it becomes 1/2VREG (V). To remove noise, it connects a condenser with the interval of between pin 53 and GND. The entry impedance: About 80 k Ω DC 1.5 V 25.2 kΩ 25.2 kΩ VREF (1.5 V) VREG (3.0 V) Modem input: It is the entry pin to enter a signal from the modem. With the audio signal mix amplifier of the following paragraph, the same signal is entered both by L-channel and R-channel. Also, it has the function which is the same as the PCcard signal entry by pin 4, the beep signal entry by pin 56 completely. The entry impedance: About 45 kΩ DC 1.5 V AC −22 dBV
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■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 39, VREG (3.0 V) Pin 39 0.9 kΩ 9 kΩ VREF (1.5 V) The signal detection system pre-amplifier negative return terminal: It is the output terminal for signal detection system pre-amplifier. The output impedance: Equal to or less than about 10 Ω DC 1.5 V AC −22 dBV 38, 10 kΩ VREF (1.5 V) Pin 38, Pin 50 The signal detection system pre-amplifier input terminal: It is the input terminal for signal detection system pre-amplifier. The entry impedance: About 10 kΩ DC 1.5 V AC −22 dBV VREG (3.0 V) 1.8 kΩ 144 kΩ AGC detection pin: It is the detection circuit to detect the signal level of the AGC circuit of the SP output for the clip prevention. It connects a condenser for the detection. The entry impedance: Unsettled DC 0 V to 1 V 90 kΩ 9 kΩ 17 kΩ 63 kΩ 9 kΩ 49-pin (2.4 V) AGC on/off control pin: It is the pin which controls the operating operation of the AGC circuit of the SP output for the clip prevention in on/off. At the time of off, the AGC circuit doesn't work. High: AGC on Low: AGC off The entry impedance: The high impedance DC
■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 8.1 kΩ 11.3 kΩ VREG (3.0 V) DC output for the AGC on level adjustment: It is an DC voltage output terminal for the AGC on level adjustment. The output impedance: Equal to or less than about 10 Ω DC 2.4 V 36 36 It changes AGC on level: It is the pin which changes the on level of AGC. The entry impedance: The high impedance DC 1.5 V 45 kΩ 81 kΩ 128 kΩ 49-pin (2.4 V) SP amplifier power saving on/off control pin: It is the pin which controls power saving by the SP amplifier. At the time of on in addition to the control in case of automatic distinction function off, too, power saving on by pin 50 has priority over. The entry impedance: The high impedance DC 1.3 V 8 VREG (3.0 V) VREF DC 1.5 V Standard bias source for EVR: It is possible to use as GND (the DC bias source) AC when connecting external EVR. It is possible to attenuate in the AC signal without cutting a signal system in "C". The output impedance: Equal to or less than about 10 Ω DC 1.5 V
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■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description Corrugation and Voltage 11, VREG (3.0 V) Pin 11 Output pins for the HP amplifier: It is output pins for the external HP amplifier. The signal which was adjusted in the volume in EVR can be output by the low impedance. The output impedance: Equal to or less than about 10 Ω DC 1.5 V AC −28 dBV
■ Application Notes Circuit Descriptions 1. Input inverting amplifier and signal mix circuit block Input inverting amplifier block 1) The input impedance of each input pin is about 50 k Ω. 2) Each input impedance is ±10% of variation exists by diffusion variation. 3) The gain of the input part is able to lowered by adding resistance to input pin in series. When addition resistance is set to Ra (k Ω) Ga = 25.2 50 + Ra Signal mix circuit block 1) It is added (mix) in the inverting amplifier method. Mix ratio is 1 to 1 for each input. 2) Connect volume to this mix amplifier output, allowing you to vary the next stage input level. 3) Pin 8 is the V REF output pin for volume reference. 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ 25.2 kΩ Mix Mix Mix Mix Mix Mix R-channel L-channel 0 dB 0 dB VREF VREF It becomes the volume for sound control by external resistance change. Gain is 0 dB at maximumvolume. It adds to the main audio signals in inverting amplifier form. Mix ratio is 1 to 1.
- Signal from PCcard
- Beep signal
- Signal from modem Vol.out audio signal External volume External volume Vol.out audio signal Audio signal L-channel input Audio signal R-channel input Modem signal input Beep input PCcard input 47 46 10 11 0dB 0dB
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■ Application Notes (continued) 2. Signal detection system mix circuit block Signal detection system mix circuit block 1) Each input signal in accordance with mix ratio of 1 to 1. Signals are detected by separate systems to prevent cancellation in the case of negative phase input for main signal R-channel and L-channel. Main audio signal L-channel Main audio signal R-channel Beep signal Signal from PCcard Signal from modem 2) Signal detection sensitivity can be adjusted with 10 kΩ external resistance connected between pin 50 and pin 51 or pin 38 and pin 39. 3) The signals input via pin 38 and pin 50 first undergo double-wave rectification, and then peak detection is performed using the external condensor connected to pin 21. 10 kΩ 10 kΩ 10 kΩ 10 kΩ 0.47 µF 0.47 µF 0.047 µF Signal detection Audio signal L-channel input Modem signal input Beep input Audio signal R-channel input PCcard input 51 50 39 38 Note) Adjust the detection sensitivity using 10 kΩ external resistance. If noise is high for the set, use more than 10 kΩ (between about 10 kΩ and 200 kΩ).
■ Application Notes (continued) 2. Signal detection system mix circuit block (continued) Detection sensitivity threshold values vs. external resistance −70 −60 −50 −40 1 10 100 1 000 Detection threshold value (L-channel) Detection threshold value vs. resistance constant (L-channel) between pin 50 and pin 51 Detection threshold value (L-channel input level) (dBV) Resistance constant (between pin 50 and pin 51) (kΩ) Power save of speaker power amplifier 1) When input signal level is lower than a certain value due to signal automatic detection circuit, power save of speaker power amp will be operated. 2) This automatic detecting function is able to stopped by pin 17. 3) When the automatic detection is off, it control manual control by pin 35. 4) Also when the automatic detection is on, manual power save on is prioritized. When it control only the automatic detecting function, set pin 35 to power save off. Signal detecting distinction output 1) The result of automatic signal detection is output from pin 22. 47 kΩ 0.047 µF Signal detection VCC VCC VCC Automatic signal detection function on/off Automatic signal detection monitor pin Power save on/of f Power save of speaker power amplifier 51 50 39 38
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■ Application Notes (continued) 3. Main signal on/off change and alarm signal mix circuit block Main signal on/off circuit 1) The speaker amplifier section is set to Mute when main signal is off. 2) High: Signal on , Low: Signal off Main signal level adjustment 1) The gain of this inverting amplifier can be reduced by adding external resistance in parallel between pin 12 and pin 13 or pin 44 and pin 45. When addition resistance is set to Rd (k Ω) Gd = 18 × (9 + Rd) 12.7 kΩ 18 kΩ9 kΩ 9 kΩ 18 kΩ 12.7 kΩ VCC Rd Rd +9 dB+3 dB +9 dB+3 dB 3 dB 3 dB AGC AGC Headphone VREF VREF Headphone Mute 9 10 11 12 13 47 46 45 44
■ Application Notes (continued) 4. Signal detection system mix circuit block AGC detection 1) The signal inputted from pin 41 and pin 16 is rectified on both waves and then mixed with L + R. 2) The above signal is peak-detected by the external part of pin 40. External is giving double-detection constant. 3) When the voltage of pin 40 is equal or more than 0.7 V , AGC is on. +9 dB +3 dB +9 dB +3 dB AGC AGC AGC on/off AGC detection 2.4 V for setting AGC level 44 43 41 36 14 16 The output wave at the time of AGC operation It is the following output wave form chart at the AGC operation time. Graph showing output wave when identical sound signals are input to two AN12941A ICs, one with AGC set to off and the other with AGC set to on. Using identical input signals, V CC, VCC_SP = 5 V R L = 8 Ω ← AGC off ← AGC on
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■ Application Notes (continued) 5. Speaker amplifier circuit block DC shift circuit 1) Shift circuit operating point of signal (bias voltage at a no signal) from V REF to VREF_SP. DC voltage (speaker output) of output becomes V REF_SP. Speaker amplifier 1) Speaker amplifier is BTL amplifier system of 2-channel. −10 dBV 50 kΩ 50 kΩ 0 dB 0 dB 0 dBVREF Out-L (SP) Out-R (SP) 4 Ω to 8 Ω 4 Ω to 8 Ω −10 dBV 0 dB 0 dB 0 dBVREF Power save Power save DC shift DC shift Muted in sync with power save of speaker amplifier. An operating point is shifted from VREF to VREF_SP. 6. Control order at power supply on/off chcange Power supply on When switching power on, it is recommended to use a speaker amplifier during a transient period from power on till a stable condition of a circuit to ensure that a circuit start up smoothly by protecting from any shock noise of a speaker circuit. 1) Control order 1. Power supply (V CC_SP, VCC): Change off to on 2. Standby control: Change on to off 3. Speaker amplifier power save control: Change on to off
■ Application Notes (continued) 6. Control order at power supply on/off change (continued) Power supply on (continued) 2) Control timing VCC_SP (Pin 28, pin 29) VCC (Pin 1) Standby control (Pin 5) Speaker pawer save control (Pin 35) Power supply on Standby control reset (Control voltage: Change low to high) Speaker pawer save control reset (Control voltage: Change low to high) Time difference: Equal to or more than 1.0 sec Standby reset after VCC_SP and VCC reach normal voltage Time difference would not cause any abnormality at VCC_SP and VCC atart up Note) *1: Time covering from standby control cancellation until a circuit stabilization to normal state. It depends on the capacitance connected to reference voltage (V REF, VREF_SP) pin. It is recommendation value of 4.7 µF. Power supply off When switching power off, it is recommended to take the order of first applying power save control to a speaker amplifier so that a circuit transient change may not effect on a speaker output. 1) Control order 1. Speaker amplifier power save control: Change off to on 2. Standby control: Change off to on 3. Power supply (V CC_SP, VCC): Change on to off
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■ Application Notes (continued) 6. Control order at power supply on/off chcange (continued) Power supply off (continued) 2) Control timing VCC_SP (Pin 28, pin 29) VCC (Pin 1) Standby control (Pin 5) Speaker pawer save control (Pin 35) Speaker pawer save control on (Control voltage: Change high to low) Standby control on (Control voltage: Change high to low) Power supply off Time difference would not cause any abnormality at VCC_SP and VCC atart down Time difference: Equal to or more than 100 msec Time difference: Equal to or more than 100 msec After power supply start up (Usual operating condition) Shock noise is likely to occur if you switch a standby control without applying a speaker power save. Therefore, do not forget to apply speaker save before switching to standby control. 7. Power dissipation of package HSOP056-P-0300A PD Ta Power dissipation PD (W) 0.000 1.000 2.000 1.572 3.000 4.000 5.000 4.280 0 2 5 150125 Ambient temperature Ta (°C) 50 75 100 Mounted on stndard board Rth(j-a) = 79.5°C/W Mounted on four layers of stndard board Rth(j-a) = 29.2°C/W Independent IC without a heat sink Rth( j-a) = 144.9°C/W 0.862 Note) The above characteristic is a reference value in case of design and is not a guarantee value.
■ Application Notes (continued) Main characteristics 1) I/O characteristics, frequency characteristics (1) SP I/O level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = On, SP gain setting = High, VCC = 3.3 V , VCC_SP = 5.0 V , Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (1) SP I/O level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = On, SP gain setting = Low, VCC = 5.0 V , VCC_SP = 5.0 V , Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (2) SP I/O level, distortion characteristics (Beep) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC = 3.3 V , VCC_SP = 5.0 V , Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (3) SP frequency level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = On, SP gain setting = High, VCC = 3.3 V , VCC_SP = 5.0 V , Input level = −22 dBV
■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (3) SP frequency level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = On, SP gain setting = Low, VCC = 5.0 V , VCC_SP = 5.0 V , Input level = −16 dBV
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■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (4) SP frequency level, distortion characteristics (Beep) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC = 3.3 V , VCC_SP = 5.0 V , Input level = −22 dBV
■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (5) SP − AGC I/O level, distortion characteristics (R-channel, L-channel) AGC = On, Automatic detection = On, VCC = 3.3 V , VCC_SP = 5.0 V , Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (6) SP − AGC frequency level, distortion characteristics (R-channel, L-channel) AGC = On, Automatic detection = On, VCC = 3.3 V , VCC_SP = 5.0 V , Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz
■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (7) Mix amplifier I/O level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC = 3.3 V , VCC_SP = 5.0 V , Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (8) Mix amplifier frequency level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC = 5.0 V , VCC_SP = 5.0 V , Input level = −10 dBV
■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (1) SP output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V , Vin = −22 dBV Input frequency = 1 kHz, RL = 8 Ω, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (1) SP output level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V , Vin = −22 dBV Input frequency = 1 kHz, RL = 4 Ω, HPF: 400 Hz, LPF: 30 kHz
■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (2) SP maximum output level characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V Input frequency = 1 kHz, RL = 8 Ω, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (3) SP − AGC output level characteristics (R-channel, L-channel) AGC = On, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V , P36 = 1.05 V Vin = −6 dBV , Input frequency = 1 kHz, RL = 8 Ω, HPF: 400 Hz, LPF: 30 kHz
■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (4) Mix amplifier output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC_SP = 5.0 V Vin = −10 dBV , Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
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■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (5) Signal detection threshold value (R-channel, L-channel) AGC = Off, Automatic detection = On, VCC_SP = 5.0 V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
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