TEA7091 TELEPHONE ANALOG FRONT END PRODUCT PREVIEW FEATURES: SPEECH DC LINE CURRENT RANGE FROM 6 TO 110mA Tx AND Rx GAIN EXTERNALLY ADJUSTABLE AGC IN Tx AND Rx EXTERNALLY PROGRAMMABLE AGC DISABLEABLE THROUGH MICROCONTROLLER BUS SINGLE/DOUBLE SIDETONE NETWORK SOFTWARE PROGRAMMABLE SOFTCLIPPING ON Tx CHANNEL SQUELCH TO REDUCE Tx NOISE ENVIROMENT AND TO IMPROVE HOWLING IMMUNITY IN LOUDHEARING MODE RECEIVING AMPLIFIER FOR PIEZO OR ELECTRODYNAMIC TRANSDUCERS +6dB MODE ON Rx CHANNEL (SELECTABLE THROUGH MICROCONTROLLER BUS) –6dB MODE ON Tx CHANNEL (SELECTABLE THROUGH MICROCONTROLLER BUS) FREQUENCY GENERATOR FOR WAITING MELODY ERROR BEEP GENERATOR HOLD LINE CURRENT DETECTOR FOR TRANSFER/ AUTO RELEASE GROUP LISTENING / ON-HOOK DIALING ANTI HOWLING WITH ACOUSTIC FEEDBACK SYSTEM COUPLED WITH SQUELCH DIGITAL VOLUME CONTROL (8 STEPS OF 4dB EACH) THROUGH MICROCONTROLLER BUS ANTILARSEN ATTENUATION (4 DIFFERENT LEVELS) PROGRAMMABLE THROUGH MICROCONTROLLER BUS HANDSFREE INTERFACE PIN AND SOFTWARE FACILITY FOR EASY INTERCONNECTION WITH HANDSFREE CONTROLLER IC. RING ON LOUDSPEAKER EMBEDDED SWITCH MODE POWER SUPSeptember 1993 PLCC44 PQFP44 PLY TO FEED THE LOUDSPEAKER AMPLIFIER DURING RING MODE DIGITAL VOLUME CONTROL (8 STEPS OF 4dB EACH) THROUGH MICROCONTROLLER BUS RING FREQUENCY GENERATOR PROGRAMMED THROUGH MICROCONTROLLER BUS DIALLING DTMF GENERATOR (CONTROLLED BY MCU BUS) DC MASK VALUE DURING MAKE PERIOD PROGRAMMABLE THROUGH MICROCONTROLLER BUS MICROCONTROLLER INTERFACE STABILIZED VOLTAGE FOR MICROCONTROLLER 2 WIRE SERIAL BUS RING INDICATOR POWER-ON SIGNAL RESET SIGNAL LINE CURRENT VARIATION INDICATOR SELF BIASED LOUDSPEAKER AMPLIFIER FOR ANSWERING MACHINE 1/7 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. TEA7091 DESCRIPTION The TEA7091 is a Telephone set Analog Front End (TAFE) interface intended for use in conjunction with a microcontroller. In this configuration the TEA7091 provides a worldwide mid-range telephone set with loudhearing on board and melody ringer on loudspeaker. Repertory dialer (memory on MCU) and various features (HOLD, Tone/Pulse, Flash, MUTE, adjustable Ringer and Loudhearing levels..) are programmable by MCU. Also high-range telephone set can be built around TEA7091 by adding Handsfree controller (TEA7540), Electronic Hook Switch and upgraded MCU (ST family) with LCD driver. The concept using TAFE + Microcontroller is called BICHIP approach. The benefits of this concept are: – Saving of external components. – Easy upgrade of the features (extra memories, LCD driver, Answering machine or Cordless interface..) through microcontroller. – Replacement of configuration switches (PABX /Public, Tone/Pulse...) by EEPROM settings. This also induces reliability and cost improvement. 39 ILL VMC 8 38 GNDA VL 9 37 SLP VREFL 10 36 VS LSIN 11 35 IREF LSSOF 12 34 SOFTL DTMF 13 33 TSOFT VRMC 14 32 VCC 18 19 20 21 22 23 24 25 26 27 28 PON CLK DATA SNSL SNLL ACFSL ACFFI RECIN REOUT GTR HFIN SWP VZP GREC EAR- EAR+ ISL 40 39 38 37 36 35 34 33 ILL VMC 2 32 GNDA VL 3 31 SLP VREFL 4 30 VS LSIN 5 29 IREF LSSOF 6 28 SOFTL DTMF 7 27 TSOFT VRMC 8 26 VCC OSC. 9 25 VREF RI/VI 10 24 MIC2 RESET 11 23 MIC1 PQFP44 VREF MIC2 MIC1 12 D93TL010 13 14 15 16 17 18 19 20 21 22 HFIN 29 17 RESET 41 GTR 30 16 RI/VI 42 REOUT 31 15 OSC 43 1 RECIN PLCC44 44 VLS ACFFI 40 ACFSL ISL 41 RSU EAR+ 42 RCO EAR- 43 SNLL GREC 44 N.C. VZP 1 SNSL SWP 2 GNDP RSU 3 CLK RCO 4 DATA N.C. 5 7 LSOUT GNDP 6 VLS PON LSOUT PINS CONNECTION (Top views) D93TL011 ABSOLUTE MAXIMUM RATINGS Symbol Value Unit – 25 to +70 – 55 to +150 °C °C Operating Temperature Storage Temperature VLM Supply Voltage (pin 3) 12 V ILM Supply Current CMOS part supply (Pin 8) 150 6 mA V – 25 to +150 °C VREGM Tj 2/7 Parameter Top Tstg Junction Temperature TEA7091 PIN DESCRIPTIONS PQFP44 No Pins PLCC44 No Pins 1 7 VLS Loudspeaker power supply. 2 8 VMC Unregulated microcontroller supply. 3 9 VL 4 5 10 11 VREFL LSIN 6 12 LSSOF Loudspeaker softclipping time constatnt. 7 8 13 14 DTMF VRMC DTMF filter. Stabilized microcontroller supply. 9 10 15 16 OSC RI/VI 11 17 RESET 12 18 PON Power on output. 13 14 19 20 CLK DATA Clock data input. Data Input. 15 16 21 22 SNSL SNLL Short line sidetone input. Long line sidetone input. 17 23 ACFSL Anti-acoustic feedback and squelch peak voltage. 18 24 ACFFI Anti-acoustic feedback and squelch filter. 19 25 RECIN Receiving Input. 20 26 REOUT Receive output. 21 27 GTR Transmit gain adjustment. 22 28 HFIN Handsfree microphone input. 23 24 29 30 MIC1 MIC2 Microphone input. Microphone input. 25 31 VREF Transmit and receive reference voltage (VCC/2). 26 27 32 33 VCC TSOFT 28 34 SOFTL 29 30 35 36 IREF VS 31 37 SLP 32 33 38 39 GNDA ILL 34 40 ISL Line current regulation stop. 35 36 41 42 EAR+ EAR– Positive earphone output. Negative earphone output. 37 38 43 44 GREC VZP Receive gain adjustment. Switch mode power supply internal zener. 39 1 SWP Switch mode power supply output. 40 41 2 3 RSU RCO Ring start up level. Ring capacitor optimization (output power). 42 4 N.C. 43 44 5 6 GNDP LSOUT Names Functions Line voltage. Loudspeaker reference voltage. Loudspeaker input. Oscillator input. Ring indicator / Line current variation indicator. Microcontroller reset. Transmit and receive power supply. Transmit soft-clipping time constant. Maximum AC signal (Softclipping threshold). Internal reference current. Shunt regulator capacitor. DC mask slope. Analog Ground (signal). Line current regulation start up. Not Connected. Power Ground. Loudspeaker Output. 3/7 4/7 MICROPHONE EARPHONE LINE 36 18 17 28 27 24 23 22 21 7 32 43 EAR- ACFSL SOFTL TSOFT MIC2 MIC1 HFIN GTR DTMF GND GND 35 EAR+ ACFF1 20 5 LSIN 37 31 SLPE GREC 29 IREF REOUT 25 VREF + VREF VL DAC HF DTMF GENERATOR DAC LF SOFTCLIPPING -1 3 VL BEEP VREF VSTAB MUTE 26 30 EARPHONE AMPLIFIER IREF VCC VS + 13 CLK 14 DATA 15 SNLL 34 ISL 33 16 ILL TX_AMP CURRENT CONTROL BLOCK SIDETONE MIXER MICROCONTROLLER INTERFACE MUTE AGC SQUELCH ANTILARSEN AGC 19 RECIN SNSL 1 VLS 2 VMC VLS 6 VRMC PON 12 RESET 11 PON & RESET CONTROL LOGIC POWER CONTROL EXTERNAL µP LOGIC CONTROL RI 10 D93TL020A RING MELODY GENERATOR OSC 9 44 39 40 41 38 3.58 MHz OSCILLATOR VREFL SWP RSU RCO VZP LSOUT 5 LSSOF 4 TEA 7091 VREFL SWITCH MODE POWER SUPPLY OUTPUT POWER RING SIGNAL OPTIMIZATION POWER STAGE RING INDICATOR CONTROL VOLUME CONTROL VOLTAGE PEAK DETECT ANTIDISTORTION STAGE AGC STAGE SERIAL REGULATOR LOUDSPEAKER POWER SUPPLY & OUT TX VCC VLS +RING LOUDSPEAKER TEA7091 Figure 1: Block Diagram. TEA7091 PLCC44 PACKAGE MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 17.4 17.65 0.685 0.695 B 16.51 16.65 0.650 0.656 C 3.65 3.7 0.144 0.146 D 4.2 4.57 0.165 0.180 d1 2.59 2.74 0.102 0.108 d2 E 0.68 14.99 0.027 16 0.590 0.630 e 1.27 0.050 e3 12.7 0.500 F 0.46 0.018 F1 0.71 0.028 G 0.101 0.004 M 1.16 0.046 M1 1.14 0.045 5/7 TEA7091 PQFP44 PACKAGE MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. A MIN. TYP. MAX. 3.40 A1 0.25 A2 2.55 B 0.134 0.0098 2.80 3.05 0.100 0.110 0.35 0.50 0.0138 0.0197 C 0.13 0.23 0.005 0.009 D 16.95 17.20 17.45 0.667 0.677 0.687 D1 13.90 14.00 14.10 0.547 0.551 0.555 D3 10.00 0.394 e 1.00 0.039 0.120 E 16.95 17.20 17.45 0.667 0.677 0.687 E1 13.90 14.00 14.10 0.547 0.551 0.555 E3 10.00 L 0.65 0.394 0.80 L1 0.95 0.025 0.0315 1.60 0.0374 0.063 0°(min.), 7°(max.) K D D1 A D3 A2 A1 33 23 34 22 0.10mm .004 B E E1 B E3 Seating Plane 12 44 11 1 C L L1 e K PQFP44 6/7 TEA7091 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 7/7