U4089B ATMEL | Alldatasheet
Document overview
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Technical content
Features
- Adjustable DC Characteristics Adjustable Transmit and Receive Gain Symmetrical Input of Microphone Amplifier Anti-clipping in Transmit Direction Automatic Line-loss Compensation Built-in Ear Protection DTMF and MUTE Input Adjustable Side Tone Suppression Independent of Sending and Receiving Amplification Integrated Amplifier for Loud-hearing Operation Anti-clipping for Loudspeaker Amplifier Improved Acoustical Feedback Suppression Selectable Line Impedance Voice Switch Supply Voltages for All Functional Blocks of a Subscriber Set Operation Possible from 10-mA Line Current Benefits Complete System Integration of Analog Signal Processing on One Chip Very Few External Components
Applications
Feature Phones Answering Machines Fax Machines Speaker Phones
Description
The telephone circuit U4089B-M is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, side tone equivalent and ear protection rectifiers. The circuit is line-powered and contains all components necessary for the amplification of signals and adaptation to the line. An integrated voice switch with a loudspeaker amplifier enables loud-hearing or hands-free operation. With an anti-feedback function, acoustical feedback during loud- hearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. Figure 1. Simple Block Diagram
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Figure 2. Block Diagram
Figure 3. Pinning SSO44
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4570A–CORD–04/03 Pin Description Pin Symbol Function 1 DTMF Input for DTMF signals. Also used for the answering machine and hands-free input.
3 MIC 2 Non-inverting input of microphone amplifier
4 MIC 1 Inverting input of microphone amplifier
6I N D The internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin. A resistor connected to ground may be used to reduce the DC line voltage. L Line voltage
8 GND Reference point for DC- and AC-output signals
9 SENSE A small resistor (fixed) connected from this pin to VL sets the slope of the DC characteristic and also affects the line- length equalization characteristics and the line current at which the loudspeaker amplifier is switched on.
10 V B Unregulated supply voltage for peripheral circuits (voice switch); limited to typically 7 V
11 SAO Output of loudspeaker amplifier
13 V MP Regulated 3.3 V supply voltage for peripheral circuits. The maximum output current is 2 mA.
20 IMPSEL
Control input for selection of line impedance 1) 600 /g87 2) 900 /g87 3) Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored
21 TSACL Time constant of anti-clipping of speaker amplifier
22 GSA Current input for setting the gain of the speaker amplifier. Adjustment characteristic is logarithmical. For RGSA > 2 M/g87/g44 the/g32speaker amplifier is switched off.
23 SA I Speaker amplifier input (for loudspeaker, tone ringer and hands-free use)
24 MUTX
Three-state input of transmit mute: 1) Speech condition; inputs MIC1/MIC2 active 2) DTMF condition; input DTMF active. A part of the input signal is passed to the receiving amplifier as a confidence signal during dialing. 3) Input DTMF used for answering machine and hands-free use; receive branch is not affected. 25 ATAFS Attenuation of acoustical feedback suppression. Maximum attenuation of the AFS circuit is set by a resistor at this pin. Without the resistor, AFS is switched off.
26 INLDT Input of transmit level detector
27 INLDR Input of receive level detector
28 TLDT Time constant of transmit level detector
29 TLDR Time constant of receive level detector
30 AGA Automatic gain adjustment with line current. A resistor connected from this pin to GND sets the starting point. Max. gain change is 6 dB.
31 IREF Internal reference current generation; RREF = 62 k /g87; IREF = 20 µA
32 STO Side tone reduction output. Output resistance is approximately 300 /g87. Maximum load impedance is 10 k/g87/g46 33 V M Reference node for microphone, earphone and loudspeaker amplifier. Supply for electret microphone (IM/g163 300 µA).
36 STI Input for side-tone network
39 RECO Output of receiving amplifier
R A resistor connected from this pin to GND sets the receiving amplification of the circuit; amplifier RA1 can be muted by applying VMP to GR
41 TTXA Time constant of anti-clipping in transmit path
42 RECIN Input of receiving path; input impedance is typically 80 k /g87
44 G T
A resistor from this pin to GND sets the amplification of the microphone and DTMF signals; the input amplifier can be muted by applying VMP to GT.
in parallel is unable to conduct current. at the 2 mA suitable for a microprocessor. Figure 4. DC Line Interface with Electronic Inductance and Generation of Regulated
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Figure 5. Functional Blocks for Power Supply
- In speech condition, the system is supplied by the line current. If the LIDET -block
is activated, thus switching on all blocks of the chip. currents of approximately 10 mA.
- Selecting IMPSEL = high impedance activates all switches at the ES line.
be attenuated. The overall loop gain remains constant under all operating conditions. pressed TX and RX envelope curves. detectors are shown in a simplified way (operational amplifiers with two diodes).
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Figure 8. Acoustic Feedback Suppression by Alternative Control of Transmit and Speaker Amplifier Gain A detailed diagram of the AFS (Acoustic Feedback Suppression) is given in Figure 8. by the differential pair of which direction should be transmitted.
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4570A–CORD–04/03 Absolute Maximum Ratings Parameters Symbol Value Unit Line current I L 140 mA DC line voltage V L 12 V Junction temperature T j 125 /g176C Ambient temperature T amb -25 to +75 /g176C Storage temperature T stg -55 to +150 /g176C Total power dissipation, Tamb = 60/g176C, SSO44 P tot 0.9 W Thermal Resistance Parameters Symbol Value Unit Junction ambient SSO44 R thJA 70 K/W
Electrical Characteristics
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k/g87, Tamb = 25/g176C, RGSA = 560 k/g87, Zear = 68 nF + 100 /g87, ZM = 68 nF , Pin 20 open, VMUTX = GND, unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit DC Characteristics DC voltage drop over circuit I L = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA VL 4.6 8.8 2.4 5.0 7.5 9.4 5.4 10.0 V V V V Transmission Amplifier, I L = 14 mA, VMIC = 2 mV, RGT = 27 k/g87, Unless Otherwise Specified Adjustment range of transmit gain GT 40 45 50 dB Transmitting amplification RGT = 12 k/g87 RGT = 27 k/g87 GT 39.8 48 49 41.8 dB Frequency response IL /g179 14 mA, f = 300 to 3400 Hz /g68GT /g1770.5 dB Gain change with current Pin 20 open (AGA), IL = 14 to 100 mA /g68GT /g1770.5 dB Gain deviation T amb = -10 to +60/g176C /g68GT /g1770.5 dB CMRR of microphone amplifier CMRR 60 80 dB Input resistance of MIC amplifier RGT = 12 k/g87 RGT = 27 k/g87 Ri 45 75 110 k/g87 Distortion at line IL > 14 mA VL = 700 mVrms dt 2% Maximum output voltage IL > 19 mA, d < 5% Vmic = 25 mV CTXA = 1 µF VLmax 1 . 834 . 2 d B m Noise at line psopho- metrically weighted IL > 14 mA GT = 48 dB no -80 -72 dBmp
4570A–CORD–04/03 Anti-clipping attack time release time CTXA = 1 µF each 3 dB overdrive 0.5 ms ms Gain at low operating current IL = 10 mA IMP = 1 mA RDC = 68 k/g87 Vmic = 1 mV IM = 300 µA GT 40 42.5 dB Distortion at low operating current IL = 10 mA IM = 300 µA IMP = 1 mA RDC = 68 k/g87 Vmic = 10 mV dt 5% Line-loss compensation IL = 100 mA, RAGA = 20 k/g87 /g68GTI -6.4 -5.8 -5.2 dB Mute suppression, MIC muted (microphone preamplifier) IL /g179/g3214 mA Mutx = open GTM 60 80 dB Receiving Amplifier, IL = 14 mA, RGR = 62 k/g87, Unless Otherwise Specified, VGEN = 300 mV Adjustment range of receiving gain IL /g179 14 mA, single-ended GR -8 +2 dB Receiving amplification RGR = 62 k/g87 RGR = 22 k/g87 GR -7.75 -7 1.5 -6.25 dB Amplification of DTMF signal from DTMF IN to RECO IL /g179/g3214 mA VMUTX = VMP GRM 147 d B Frequency response IL > 14 mA, f = 300 Hz to 3400 Hz /g68GRF ±0.5 dB Gain change with current I L = 14 to 100 mA /g68GR ±0.5 dB Gain deviation T amb = -10 to +60/g176C /g68GR ±0.5 dB Ear protection IL /g179/g3214 mA VGEN = 11 Vrms EP 1.1 Vrms MUTE suppression DTMF operation IL /g179/g3214 mA VMUTX = VMP /g68GR 60 dB Output voltage d /g163/g322% IL = 14 mA Zear = 68 nF 0.5 V rms Maximum output current d /g163/g322% Zear = 100 /g87 4 mA (peak) Receiving noise psophometrically weighted Zear = 68 nF + 100 /g87 IL /g179 14 mA ni -80 -77 dBmp Output resistance Output against GND R o 10 /g87 Line-loss compensation RAGA = 20 k/g87, IL = 100 mA /g68GRI -7.0 -6.0 -5.0 dB AC impedance Z imp 840 900 960 /g87 Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k/g87, Tamb = 25/g176C, RGSA = 560 k/g87, Zear = 68 nF + 100 /g87, ZM = 68 nF , Pin 20 open, VMUTX = GND, unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
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4570A–CORD–04/03 Gain at low operating current IL = 10 mA IMP = 1 mA IM = 300 µA VGEN = 560 mV RDC = 68 k/g87 GR -8 -7 -6 dB Distortion at low operating current IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 k/g87 dR 5% Speaker Amplifier Minimum line current for operation No AC signal I Lmin 15 mA Input resistance 24 14 22 k /g87 Gain from SAI to SAO VSAI = 3 mV , IL = 15 mA, RGSA = 560 k/g87 RGSA = 20 k/g87 GSA 35.5 36.5 37.5 dB dB Output power Load resistance RL = 50 /g87, d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA PSA PSA mW mW Output noise (input SAI open) psopho-metrically weighted IL > 15 mA n SA 200 µV psoph Gain deviation IL = 15 mA Tamb = -10 to +60/g176C /g68GSA ±1 dB Mute suppression IL = 15 mA, VL = 0 dBm, VSAI = 4 mV Pin 23 open VSAO -60 dBm Gain change with current I L = 15 to 100 mA /g68GSA ±1 dB Resistor for turning off speaker amplifier IL = 15 to 100 mA RG SA 0.8 1.3 2 M /g87 Gain change with frequency IL = 15 mA f = 300 to 3400 Hz /g68GSA ±0.5 dB Attack time of anti-clipping 20 dB over drive t r 5m s Release time of anti-clipping t f 80 ms DTMF Amplifier Test Conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF gain IL = 15 mA Mute active GD 40 50 dB DTMF amplification IL = 15 mA, VDTMF = 8 mV Mute active: MUTX = VMP GD 40.7 41.7 42.7 dB Gain deviaton IL = 15 mA Tamb = -10 to +60/g176C GD ±0.5 dB Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k/g87, Tamb = 25/g176C, RGSA = 560 k/g87, Zear = 68 nF + 100 /g87, ZM = 68 nF , Pin 20 open, VMUTX = GND, unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
4570A–CORD–04/03 Input resistance RGT = 27 k/g87, RGT = 15 k/g87 Ri 180 300 130 k/g87 Distortion of DTMF signal IL /g179/g3215 mA VL = 0 dBm dD 2% Gain deviation with current I L = 15 to 100 mA /g68GD ±0.5 dB AFS Acousting Feedback Suppression Range of attenuation I L /g179/g3215 mA 0 50 dB Attenuation of transmit gain IL /g179/g3215 mA, IINLDT = 0 µA RATAFS = 30 k/g87 IINLDR = 10 µA /g68GT 45 dB Attenuation of speaker amplifier IL /g179/g3215 mA IINLDP = 0 µ RATAFS = 30 k/g87 IINLDR = 10 µ /g68GSA 50 dB AFS disable I L /g179/g3215 mA V ATA FS 1.5 V Supply Voltages, Vmic = 25 mV, Tamb = -10 to +60/g176C VMP IL = 14 mA, RDC = 68 k/g87 IMP = 2 mA VMP 3.1 3.3 3.5 V VM IL /g179 14 mA, IM = 300 µA RDC = 130 k/g87 VM 1.4 3.3 V VB IB = +20 mA, IL = 0 mA VB 77 . 6V MUTX Input (see Figure 20) Input current VMUTX = VMP VMUTX = GND IMUTX IMUTX +20 -20 +30 -30 µA µA Input voltage Input high V MUTX VMP -
0.3 V V
Input low V MUTX 0.3 V Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k/g87, Tamb = 25/g176C, RGSA = 560 k/g87, Zear = 68 nF + 100 /g87, ZM = 68 nF , Pin 20 open, VMUTX = GND, unless otherwise specified. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
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4570A–CORD–04/03 U4089B-M Control AFS = Acoustical feedback-suppression control AGA = Automatic gain adjustment TXACL = Transmit anti-clipping control ES = External supply MUTX MODE MIC 1/2 transmit enabled receive enable AFS = on AGA = on TXACL = on Speech Z DTMF transmit enabled receive enable AFS = on AGA = on TXACL = on For answering machine DTMF transmit enabled DTMF to receive enable AFS = off AGA = off TXACL = off DTMF dialling IMPSEL MODE Line impedance = 600 /g87 TXA = on ES = off Speech 0 to Z Line impedance = 600 /g87 TXA = off ES = on T ransmit mute 1 to Z Line impedance = 900 /g87 TXA = off ES = on T ransmit mute Line impedance = 900 /g87 TXA = on ES = off Speech Logic Level 0 = < (0.3 V) Z = > (1 V) < (V MP - 1 V) or (open input)
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Figure 14. Typical Adjustment Range of the Receive Gain Figure 15. Typical AGA Characteristic
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Figure 18. Typical Load Characteristic of VB for a Minimum DC Characteristic
Figure 19. DC Voltage Absolute
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Figure 20. DC Voltage Current Test
Figure 21. DC Ramps
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Figure 22. AC Tests
Figure 23. Application for Hands-free Operation
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4570A–CORD–04/03 Table 1. Typical Values of External Components (see Figure 23)
Package Information
N a m eV a l u eN a m eV a l u eN a m eV a l u eN a m eV a l u e C2 4.7 nF C 16 47 µF R 3 >68 k/g87 R16 1 k/g87 C3 10 µF C 17 10 µF R 4 10 k/g87 R17 1.2 k/g87 C4 220 µF C 18 10 µF R 6 62 k/g87 R18 30 k/g87 C5 47 µF C 21 1 µF R 8 22 k/g87 R21 15 k/g87 C7 1 µF C 23 6.8 nF R 9 330 k/g87 R22 330 k/g87 C8 100 µF C 24 10 nF R 10 3 k/g87 R23 220 k/g87 C10 150 nF C 25 100 nF R 11 62 k/g87 R24 68 k/g87 C11 68 nF C 26 470 nF R 12 30 k/g87 R25 2 k/g87 C12 33 nF C 27 33 nF R 13 62 k/g87 R26 3.3 k/g87 C14 100 nF C 28 10 µF R 14 120 k/g87 R29 1 k/g87 C15 1 µF R 2 20 k/g87 R15 47 k/g87 R30 12 k/g87
Ordering Information
Extended Type Number Package Remarks U4089B-MFN SSO44 Tubes U4089B-MFNG3 SSO44 Taped and reeled technical drawings according to DIN specifications Dimensions in mm 0.25 0.10 0.3 0.8 18.05 17.80 16.8 2.35 9.15 8.65 7.50 7.30 10.50 10.20 0.25 44 23 1 22
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