AN6426NK PANASONIC

Document overview

  • Manufacturer or author: Provided By digicamel.com
  • PDF pages: 9

Technical content

The AN6426NK incorporates both speech network and hands-free functions. Its well designed block configura- tion allows realization of a hands-free telephone with a minimal number of components. n Features

  • Incorporates all the functions required of a hands-free telephone.
  • Incorporates all the functions required of a handset.
  • Complies with AC and DC impedance requirements.
  • Provides a wide dynamic range.
  • A noise detecting circuit prevents inadvertent transmis- sion.
  • Operation on an external power supply is available.
  • Each mode can be easily controlled.
  • A built-in loudspeaker amplifier can operated either on line voltage or an external power supply. AN6426NK Hands-free Speech Network IC Unit : mm SDIP package with 42 pins (SDIP042-P-0600A) 3 to 15° 15.3–0.25 0.3 +0.1 – 0.05 13.7–0.3 36.8–0.3 0.9–0.25 0.5–0.1 4.76–0.25 4.5–0.25 0.96–0.25 T Log Send AP AP Buff- er 38 39 19 14 15 41 42 36 34 29 6 5 35 1 2543287910 Vrl V B V B V B V L V CC1 V CC2 GND V BVr2 Vr1 Vr1 V CC1 Vr1 AGC MA2 MA1 TATT Vrl R Log Rec Pre Vrl Power Regulator Power Regulator Matrix Circuit Matrix Circuit RATT S.AmpRec.2Rec.1Buffer Attenator Control Power Regulator Comp n Block Diagram

Pin No. DescriptionSymbol GND AGC SAO SAI Vr2 VPO RO1 RO2 RBO RPO RPI MAI1 MAO1 TL1 TLO ND1 ND2 TAI TAO ATC TAC AC RAC RVR RAO RAI RLO RLI V CC 2 Mute (R) HSu/SPu Mute (S) APC Vr1 VB VCC MAO2 MAO2 TSI MFI MF VL Ground Loudspeaker amp. time constant Loudspeaker amp. output Loudspeaker amp. input Reference voltage (2) Loudspeaker amp. power supply Receiver output (1) Receiver output (2) Receiver buffer output Receiver preamp. output Receiver preamp. input MIC amp. input (1) MIC amp. output (1) Transmitter LOG amp. input Transmitter LOG amp. output Noise detection time constant (1) Noise detection time constant (2) Transmitter att. input Transmitter att. output Att. timing control Transmitter att. control Pin No. DescriptionSymbol Att. control Receiver att. control To receiver rheostat Receiver att. output Receiver att. input Receiver LOG amp. output Receiver LOG amp. input Supply voltage (2) Receiver mute HS/HF switching Transmitter mute Auto. PAD control Reference voltage (1) Reference voltage Supply voltage (1) MIC amp. input (2) MIC amp. output (2) Transmitter signal input MF signal input Transmitter output Line voltage

ICs for Telephone AN6426NK V L IL PD Topr Tstg Supply voltage Supply current Power dissipation (Ta = 60˚C) Operating ambient temperature Storage temperature V mA mW Parameter Symbol Rating Unit n Absolute Maximum Ratings (Ta=25˚C) 14.4 120 1700 –20 to + 60 –55 to +150 Note) The IC must be used under the condition PD >V CC · ICC . Parameter Symbol Range n Recommended Operating Range (Ta=25˚C) Operating supply voltage range V L 3V to 12V Parameter Symbol Condition min typ max Unit n Electrical Characteristics (Ta=25˚C) Power Supply DC line voltage (1) 3.6V L (1) VVoltage at Pin42 with IL=20mA 4.2 5.2 DC line voltage (2) 9.0V L (2) VVoltage at Pin42 with IL=120mA 11.0 12.0 Int. supply voltage (1) 1.8V CC (1) VVoltage at Pin36 with IL=20mA 2.3 2.8 Int. supply voltage (2) 6.0V CC (2) VVoltage at Pin36 with IL=120mA 7.0 9.0 Int. regulated voltage (1) 0.95V B (1) VVoltage at Pin35 with IL=20mA 1.10 1.35 Int. regulated voltage (2) 1.10V B (2) VVoltage at Pin35 with IL=120mA 1.20 1.45 Trans. gain 26G S dB29 32 Rec. gain 36G R ni=–60dBm input pinoutput pin 11 7, 8 7, 8 dB39 42 Max. rec. level 4V R nO =4dBm fi=1kHz, ni=–25dBm ni=–25dBm37 7, 840 dBm71 0 MF rec. gain G MR 9d B36 fi=1kHz, nO =5dBm7, 840MF max. rec. level V MR 11 dBm58 Gain difference with ni=–60dBm as IL changes between 30 and 80mA 7, 811AP (R) characteristics DG R –4 dB–8 –6 fi=1kHz, ni=–25dBm4240MF trans. gain G MS 28 dB22 25 V PO =3V, THD=5%34Loudspeaker amp. (1) V OSP (1) dBm–10 –5 V PO =5V, THD=5%34Loudspeaker amp. (2) V OSP (2) dBm–4 1 V PO =7V, THD=5%34Loudspeaker amp. (3) V OSP (3) dBm04 fi=1kHz, nO =1dBm4240MF max. trans. level V MS 7 dBm14 Gain difference with ni=–25dBm as IL changes between 30 and 80mA 4237AP (S) characteristics DG S 0d B–6 –4 V 24=V 35, ni=–20dBm, IL=60mA 2526Rheostat characteristics (1) V V –22 dBm–28 –25 ni=–20dBm, I20=14µA T12–T11 Value 2526Att. trans. gain G ART –28 dB–38 –33 HS U Receiver HS U Transmitter SP U Receiver

+ ++ + Note) The circuit applies when a ceramic receiver is used. When a dynamic receiver is used, the following circuits apply. a a 0.033µF 10µF CS (HSU ) C6 C6 0.033µF SP(SPU ) CS(HS U ) MIC(SP U ) R37 2.2kW R12 22kW R10 5.1 kW R11 220 k WR9 2.2 1kW k W 220 kW 390 W 820W R2 1kW 220 kW R24 10kW D 6 100mAAC Adaptor C18°0.1µF C28 0.039µF C34 µF C33 4.7 µF C25 0.001 µF C26 220µF 0.068µF 220 µF C23 220 µF C22 C21 47µF C20 0.1 µF C18 1µF C19 1µF C17 µF µF C24 D.B. R132 1M W R29 100kW R28 33W R24A 12kW R23 680W R21 2.2kW R20 43kW 6.8 kW R19 R18 100kW R36 100kW R16 2.2 M W R14 kW R13 22kW R17 2.2 kW 20kB R15 SW S2 S3 a a ++ + ab b b b MF IN MIC(HS U ) 5.1 kW R22 R28A 20W R25 3.9kW R21 100kW R26 3.3kW R27 330W R31 680W DPin ZNR 390V Z GND R35 10Ω R3 1kW C12 F C27 22µF 820 pF AN6426NK C11 F 1µF C14 C16 2.2 µF C10 1µF 0.1µF 100µF 220 µF 10 µFC2 3300 pF 10µF100µF C32 C31 1000µF C30 100µF C50.033µF 0.033µF R10 100 k W C15 2.2µF M W SW6 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 7 8 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 n Application Circuit Parameter Symbol Condition min typ max Unit n Electrical Characteristics (cont.) (Ta=25˚C) SP U Transmitter Input pinsOutput pins ni=–60dBm IL=60mA1312MIC amp. gain G MAI 38 dB32 35 IL=60mA THD=5%1312MIC amp. max. output V MAI 7 dBm14 ni=–25dBm IL=60mA4239Trans. gain G TS 23 dB17 20 IL=60mA THD=10%4239Max. trans. level V TS 10 dBm47 ni=–20dBm ni=–20dBm IL=60mA1918Att. rec. gain DG ATR –24 dB–34 –29 ni=–20dBm IL=60mA1918Idling V Id –12 dB–18 –15 IL=60mA Ii= –1µA to –300µA Note) Unless otherwise specified, fi=1kHz, IL=30mA (HSU ), 60mA (SPU ). LOG amp. linearity LT dB40 50 LOG amp. linearity 40 LR dBIL=60mA, Ii=–1µA to –300µA 50 V 24=0V, ni=–20dBm, IL=60mA 2526Rheostat characteristics (2) DG V –17 dBm–27 –22

ICs for Telephone AN6426NK n Pin Descriptions 1. Hand Set Communications Block (HSu) [ Transmitter System] Microphone amplifier Input : pin3 (minus input), Output : Pin38 (collector out- put) The gain and frequency characteristics are determined by the external resistors R19 (6.8kW )and R20 (43kW ), and capacitors C24 (0.068µF)and C25 (1,000pF). R21 (2.2kW )is a resistor for the power supply for ECM. Transmitter selector switch Input : Pin39 (speech), Pin40 (MF, holding tone) The switch changes over transmitter input for hand set communications, transmitter input for hand-free communi- cations, and MF (Multi Frequency) input. The input impe- dance at the Pin39 is 3.9kW and DC is VR (Pin34) C33 (4.7µF) is a DC preventive capacitor. R22 (33kW ) is to adjust the input to the log amplifier. which is to detect the transmission level. It attenuates the amplifier input to The input impedance at the Pin40 is 3.35kW and DC is VR. C34 is input through 10µF. Transmitter automatic pad Control : Pin33 Varies the transmitter/receiver gain by the value of the current supplied to the IC. A variable point can be moved by R18 (100k W ). Increasing R18 causes AP to start operation at a higher line current. [Receiver System] Receiver preamplifier Input : Pin11(minus input), Output : Pin10 (collector out- put) The gain and frequency characteristics are determined by the external resistors R5 (1kW )and R4 (22kW ), and capac- itors C8 (0.1µF)and C7 (3,300pF) Receiver selector switch Input : Pin10, Pin40 The switch changes over receiver input for hand set com- munications and MF input. Receiver automatic pad Control : Pin33 Common with transmitter automatic pad Receiver buffer amplifier Output : Pin9 Outputs a receiver signal for hand-free communications at low inpedance. 37 38

n Pin Descriptions (cont.) Receiver output Output : Pin7, Pin8 Drives the ceramic receiver directly. The gain depends on an internal resistance and is about 23dB. The frequency characteristic control capacitors C5 (0.033µF) and C6 (0.033µF), and output level control resistors R2(1kW )and R3 (1kW )are attached. 2. Hand-free Speech network Block (SP U ) [Transmitter System] Microphone amplifier Input : Pin12(minus input), Output : Pin13(emitter out- put) The gain and frequency characteristics are determined by the external resistors R7(820W )and R6(47kW ), and capaci- tors C10 (1µF) and C9 (820pF). R37 (2.2kW ) is a resistor for the power supply to ECM. Transmitter log amplifier Input : Pin14(current input), Output : Pin15 (voltage out- put) The input voltage is converted into a current at R8(390W )and C11 (0.1µF). The attack and recovery time are determined by R9 (2.2MW )and C12(1µF). Receiver log amplifier Input : Pin28 (current input), Output : Pin27 (voltage out- put) The input voltage is converted into a current at R17 (2.2kW )and C20 (0.1µF). The attack and recovery time are determined by R16 (2.2MW )and C19 (1µF). Noise detector circuit Output : Pin16, Pin17 When a continuous sound (noise 9) is input, the transmitter is set to –10dB. The attack time for this operation is determined by R10 (100kW )and C27 (22 µF), and the recovery time by R11(220kW )and C15 (2.2µF). To stop the noise detector circuit, ground the Pin16. Receiver VR Control : Pin24 A smoothed voltage is given by C17 (33µF). Normally, VB (Pin35) is divided and given by R15 (20kW ). The output becomes maximum when the voltage at the Pin24 is VB, and –31dB when 0V. Transmitter attenuator Input : Pin18 (Zi=15kW ), Output : Pin19 (emitter out- put) The input is of only AC component due to C14 (1µF). At transmission time, an attenuation amount is varied with- in a range of about 0 to –36dB by the Gilbert circuit. The Pin18 is 15kW and connected to the VB Pin (1.2V) 8 7

ICs for Telephone AN6426NK n Pin Descriptions (cont.) Receiver attenuator Input : Pin26 (Zi=15kW ), Output : Pin25 (emitter out- put) The input is of only AC component due to C18 (1µF). At transmission time, an attenuation amount is varied with- in a range of about 0 to –36dB by the Gilbert circuit. The Pin25 is 15kkW and connected to the VB pin (1.2V). [Control System] High level ; 1 to 5V, Low level ; 0 to 0.5V Controllable with the microcomputer. HS U /SPU selector switch Control : Pin30 High : HS U , Low : SPU Transmitter mute switch Control : Pin32, High : Transmission, Low : Mute (MF transmission) Receiver mute switch Control : Pin30, High : Reception, Low : Mute (MF reception) Attenuator timing control (TAC) Control : Pin20 Controls the transmitter/receiver attenuator switching speed with C16(2.2µF). V 20–29 » 0V in the transmitter mode, and V20–29 » –120mV in the receiver mode. Transmitter attenuator control (TAC) Control : Pin21 Controls the transmitter attenuator gain with R12(22kW) . Receiver attenuator control (RAC) Control : Pin23 Controls the receiver attenuator gain with R13 (22kW ). Transmitter/receiver attenuator control (AC) Control : Pin22 Controls the transmitter/receiver attenuator gain with R14 (27kW ). Speaker amplifier Input : Pin4, Output : Pin3, AGC : Pin2 Plus input amplifier of about 34 dB and driven at 25W . The input is of only AC component due to C3 (10µF). The output drives the 25W speaker througt C2 (220µF). The attack time and recovery time for AGC is determined by C1 (10µF) and R1(220kW ). Logic Circuit 30 31 32 20 21 22 23 6 2

n Pin Descriptions (cont.) 3. Power Supply Block HSU voltage source (VCC1 ) Stabilized by the Pin36 and C22 (220µF). HSU reference voltage (Vr1) Results in VCC /2 by resistance division (20kW )from the Pin34 and VCC , and stabilized by C22 (220µF) Constant voltage source (VB) Results in 1.2V by the Pin35 (band gap reference). Stabilized by C23 (220µF) Ground pin (GND) Pin1 (common with the GND pin of the speaker amplifier) 4. Other Circuit Blocks Balance network circuit Prevents howling. (R25, R26, R24, C28, R27, R28) Telephone circuit connection circuit Determines the polarity of the telephone circuit. (DB, R30, Q1, R32, R29, Q2, R31, C29) Speaker amplifier voltage source (VPO) Pin6. It is necessary to stabilize the power supply in order to prevent a receiver signal from leaking to the cir- cuit.(R34, C30, D1, Q3, C31, R35, C32, Q4) An AC adapter is available. (Q5, R33, D2, S5) Speaker amplifier reference voltage (Vr2) Pin5 (V CC2 /2) Stabilized by C4 (100µF) SPU voltage source (VCC2 ) The Pin29 (normally connected to VCC Pin1) is stabilized by C21 (100µF). A voltage can be applied from the outside. (S4, Q6, R36, D3, S1) 3435 Bandgap reference Note) The above characteristics are design reference values and not guaranteed values. HS U IL=20mA, f=1kHz HS U IL=90mA, f=1kHz SPU IL=20mA, f=1kHz Parameter Symbol Condition min typ max Unit n Supplementary Explanation

  • Electrical Characteristics Design Reference Values (Ta=25°C) AC Impedance (1) AC Impedance (2) AC Impedance (3) Z ac (1) Zac (2) Zac (3) 450 450 450 610 610 610 750 750 750 W W W

ICs for Telephone AN6426NK 0 12020 40 60 80 1000 Circuit Voltage VL (V) Circuit Current IL (mA) V L — IL Receiver Output u 7—8 (dB) Receiver Input ( u 11) (dB) Handset Receiver I/O Characteristics –40 –30 –20 –10 IL=40mA f=1kHz Transmitter Output u 42 (dB) Microphone Input u 37 (dB) Handset Transmitter I/O Characteristics –40 –30 –20 –10 0 12020 40 60 80 100 Receiver Output u 7—8 (dB) Circuit Current IL (mA) Handset Receiver Automatic Pad Characteristics –30 –20 0 12020 40 60 80 100 Transmitter Output u 4—2 (dB) Circuit Current IL (mA) Handset Transmitter Automatic Pad Characteristics – 6 – 4 – 2 ui=25dBm f=1kHz – 0.1 –100 –1 –10 Log Amplifier Output Voltage Change Amount DVO (mV) Log Amplifier Input Current (µA) Log Amplifier Characteristics for Hands-free Speech Network –50 100 150 200 0 12020 40 60 80 100 Attenuation (dB) DV (V CC —V ATC ) (mV) Hands-free Speech network Transmitter Receiver Switching –30 –20 –10 Trabsnutter ( u 19) Receiver ( u 25) 40ms Hands-free Speech network Transmitter/Receiver Switching

1 VPP

2 VPP

/,/,/,/,/,/,/, /,/,/,/,/,/,/, /,/,/,/,/,/, /,/,/,/,/,/, /,/,/,/,/,/,/, /,/,/,/,/,/,/, 0 15025 50 75 100 1250 Power Dissipation PD (mW) Ambient Temperature Ta (°C) PD —Ta (IC Singular) 1000 2000 (1880mW) ui= 60dBm f=1kHz n Characteristics Curve