U4089B ATMEL Corporation, U4089B Datasheet

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U4089B

Manufacturer Part Number
U4089B
Description
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer
ATMEL Corporation
Datasheet
Features
Benefits
Applications
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
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
Complete System Integration of Analog Signal Processing on One Chip
Very Few External Components
Feature Phones
Answering Machines
Fax Machines
Speaker Phones
Speech
circuit
switch
Voice
amplifier
Audio
Dialer
Monolithic
Integrated
Feature Phone
Circuit
U4089B-M
Rev. 4570A–CORD–04/03
1

Related parts for U4089B

U4089B Summary of contents

Page 1

... Speaker Phones Description The telephone circuit U4089B 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. ...

Page 2

... Figure 2. Block Diagram 4 MIC1 MIC 3 MIC2 1 DTMF 41 TX TTXA ACL 27 INLDR 26 INLDT Acoustical 29 feedback TLDR suppression 28 TLDT control 25 ATAFS 11 SAO SACL 21 TSACL 23 SAI 22 GSA U4089B STO 600 W 900 W TXA Impedance Transmit mute control MUTX RECO GR SENSE V V IMPSEL AGA IND Power supply ...

Page 3

... Pin Configuration Figure 3. Pinning SSO44 4570A–CORD–04/ DTMF MIC2 4 41 MIC1 IND GND 9 36 SENSE SAO VMP IMPSEL 21 24 TSACL 23 22 GSA U4089B RECIN TTXA GR RECO NC NC STI STO IREF AGA TLDR TLDT INLDR INLDT ATAFS MUTX SAI 3 ...

Page 4

... Time constant of anti-clipping in transmit path 42 RECIN Input of receiving path; input impedance is typically resistor from this pin to GND sets the amplification of the microphone and DTMF signals; the input amplifier can muted by applying V U4089B-M 4 sets the slope of the DC characteristic and also affects the line ...

Page 5

... NPN BOPT in parallel is unable to conduct current. The U4089B-M contains a series regulator which provides a supply voltage V at the 2 mA suitable for a microprocessor. Figure 4. DC Line Interface with Electronic Inductance and Generation of Regulated and Unregulated Supply ...

Page 6

... Selection of the active channel is made by comparison of the logarithmically com- pressed TX and RX envelope curves. The system configuration for group listening, which is realized in the U4089B-M, is illus- trated in Figure 7. TXA and SAI represent the two attenuators; the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes). ...

Page 7

... GSA SAI SAI 4570A–CORD–04/03 Figure 6. Basic Voice-switch System Handset microphone Logarithmic Loud speaker INLDT TLDT STO - VBG + AFS control Max AGA att. - VBG + TLDR RECO INLDR U4089B-M TX attenuation Hybrid Attenuation control Logarithmic RX attenuation Zint RECIN GR STI STO STN Line 7 ...

Page 8

... Figure 8. Acoustic Feedback Suppression by Alternative Control of Transmit and Speaker Amplifier Gain RLDT RLDR U4089B-M 8 TLDT TXA INLDT INLDR IATGSA TLDR ATAFS RATAFS A detailed diagram of the AFS (Acoustic Feedback Suppression) is given in Figure 8. Receive and transmit signals are first processed by logarithmic rectifiers in order to pro- duce the speech envelopes at TLDT and RLDT ...

Page 9

... Figure 10. Threshold of Speaker Amplifier off Figure 11. Comparator Thresholds Depend on the DC Mask and Line Impedance RATAFS RATAFS not usable GSA 36 dB GSA (dB off ¥ 130 (mA) L ILON at line impedance = 600 W ILOFF at line impedance = 600 W ILON at line impedance = 900 W ILOFF at line impedance = 900 W U4089B-M 9 ...

Page 10

... RGT = > Distortion at line V = 700 > 19 mA, d < Maximum output voltage V mic CTXA = 1 µF Noise at line psopho- I > metrically weighted U4089B-M 10 Symbol amb T stg P tot Symbol R thJA = 2 mA, RDC = 130 kW amb = GND, unless otherwise specified. MUTX Pin = 2 mV, RGT = 27 kW, Unless Otherwise Specified MIC = -10 to +60° ...

Page 11

... GND, unless otherwise specified. MUTX Pin = -10 to +60° rms = 100 100 W = 25°C, RGSA = 560 kW, Symbol Min. Typ. 0 -6.4 -5 300 mV GEN - -7.0 -6 840 900 imp U4089B-M Max. Unit -6. ±0.5 dB ±0.5 dB ±0.5 dB 1.1 Vrms dB V rms mA (peak) -77 dBmp 960 11 ...

Page 12

... DTMF Amplifier Test Conditions: IMP = 2 mA 0.3 mA, V Adjustment range of DTMF gain Mute active mA, L VDTMF = 8 mV DTMF amplification Mute active: MUTX = VMP Gain deviaton T amb U4089B mA, RDC = 130 kW amb = GND, unless otherwise specified. MUTX Pin = 560 560 mV -10 to +60° VMP MUTX = -10 to +60°C = 25° ...

Page 13

... GND, unless otherwise specified. MUTX Pin = 0 µ µ µ µ = -10 to +60° GND = 25°C, RGSA = 560 kW, Symbol Min. Typ. 60 180 DGD 1.5 ATAFS V 3 +20 MUTX I -20 MUTX MUTX 0 MUTX U4089B-M Max. Unit 300 kW 130 2 % ±0 3.5 V 3.3 V 7.6 V +30 µA -30 µ ...

Page 14

... U4089B-M Control U4089B-M 14 MUTX MIC 1/2 transmit enabled receive enable AFS = on 0 AGA = on TXACL = on DTMF transmit enabled receive enable AFS = on Z AGA = on TXACL = on DTMF transmit enabled DTMF to receive enable AFS = off 1 AGA = off TXACL = off IMPSEL Line impedance = 600 W 0 TXA = on ...

Page 15

... Figure 12. Typical DC Characteristic Figure 13. Typical Adjustment Range of the Transmit Gain G (dB) T U4089B-M 15 ...

Page 16

... U4089B-M 16 Figure 14. Typical Adjustment Range of the Receive Gain Figure 15. Typical AGA Characteristic 4570A–CORD–04/03 ...

Page 17

... Figure 16. Typical Load Characteristic Characteristic and a 3-mW Loudspeaker Output Figure 17. Typical Load Characteristic of V (RDC = 130 and a 3-mW Loudspeaker Output U4089B-M for a Maximum (RDC = infinity) B for a Medium DC Characteristic B 17 ...

Page 18

... U4089B-M 18 Figure 18. Typical Load Characteristic of V (RDC = and a 3-mW Loudspeaker Output for a Minimum DC Characteristic B 4570A–CORD–04/03 ...

Page 19

... Figure 19. DC Voltage Absolute 4570A–CORD–04/03 U4089B-M 19 ...

Page 20

... Figure 20. DC Voltage Current Test U4089B-M 20 4570A–CORD–04/03 ...

Page 21

... Figure 21. DC Ramps 4570A–CORD–04/03 U4089B-M 21 ...

Page 22

... Figure 22. AC Tests U4089B-M 22 4570A–CORD–04/03 ...

Page 23

... Figure 23. Application for Hands-free Operation 4570A–CORD–04/03 U4089B-M 23 ...

Page 24

... Table 1. Typical Values of External Components (see Figure 23) Name Value C 4 µ 220 µ µ µ 100 µ 150 100 µF 15 Ordering Information Extended Type Number U4089B-MFN U4089B-MFNG3 Package Information Package SSO44 Dimensions in mm 0.3 0 U4089B-M 24 Name Value Name C 47 µ µ µ µ 6 100 470 µF ...

Page 25

... Atmel Corporation 2003. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...

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