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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
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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 PINS CONNECTION (Top views)
LSOUT
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.
LSOUT
GNDP
GREC
GREC
GNDP
EAR+
EAR+
35
EAR-
SWP
RCO
EAR-
RSU
SWP
N.C.
RCO
VZP
RSU
N.C.
VZP
ISL
6 VLS VMC VL VREFL LSIN LSSOF DTMF VRMC OSC RI/VI RESET 7 8 9 10 11 12 13 14 15 16 17
5
4
3
2
1
44
43
42
41
40 39 38 37 36 35 ILL GNDA SLP VS IREF SOFTL TSOFT
44 VLS VMC VL VREFL LSIN LSSOF DTMF
32 31 30 29 VCC
43
42
41
40
39
38
37
36
34 33 32 31 30 29 ILL GNDA SLP VS IREF SOFTL TSOFT VCC VREF MIC2 MIC1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
PLCC44
34 33
PQFP44
ISL
28 27 26 25 24 23
VRMC
VREF
OSC.
MIC2
RI/VI
MIC1
RESET
18 19 20 21 22 23 24 25 26 27 28
PON
CLK
DATA
SNSL
SNLL
ACFSL
ACFFI
RECIN
REOUT
GTR
DATA
SNSL
SNLL
ACFSL
RECIN
REOUT
ACFFI
HFIN
HFIN
PON
CLK
GTR
D93TL010
D93TL011
ABSOLUTE MAXIMUM RATINGS
Symbol Top Tstg VLM ILM VREGM Tj Operating Temperature Storage Temperature Supply Voltage (pin 3) Supply Current CMOS part supply (Pin 8) Junction Temperature Parameter Value - 25 to +70 - 55 to +150 12 150 6 - 25 to +150 Unit C C V mA V C
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TEA7091
PIN DESCRIPTIONS
PQFP44 No Pins 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 PLCC44 No Pins 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 1 2 3 4 5 6 Names VLS VMC VL VREFL LSIN LSSOF DTMF VRMC OSC RI/VI RESET PON CLK DATA SNSL SNLL ACFSL ACFFI RECIN REOUT GTR HFIN MIC1 MIC2 VREF VCC TSOFT SOFTL IREF VS SLP GNDA ILL ISL EAR+ EAR- GREC VZP SWP RSU RCO N.C. GNDP LSOUT Loudspeaker power supply. Unregulated microcontroller supply. Line voltage. Loudspeaker reference voltage. Loudspeaker input. Loudspeaker softclipping time constatnt. DTMF filter. Stabilized microcontroller supply. Oscillator input. Ring indicator / Line current variation indicator. Microcontroller reset. Power on output. Clock data input. Data Input. Short line sidetone input. Long line sidetone input. Anti-acoustic feedback and squelch peak voltage. Anti-acoustic feedback and squelch filter. Receiving Input. Receive output. Transmit gain adjustment. Handsfree microphone input. Microphone input. Microphone input. Transmit and receive reference voltage (VCC/2). 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. Line current regulation stop. Positive earphone output. Negative earphone output. Receive gain adjustment. Switch mode power supply internal zener. Switch mode power supply output. Ring start up level. Ring capacitor optimization (output power). Not Connected. Power Ground. Loudspeaker Output. Functions
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VCC VLS VL RECIN SNSL 19 4 VOLTAGE PEAK DETECT VREFL VREFL 15 16 1 SNLL VLS 3 VSTAB LOUDSPEAKER POWER SUPPLY & OUT TX ANTIDISTORTION STAGE VREF AGC STAGE VOLUME CONTROL POWER STAGE 44 LSOUT 5 LSSOF AGC SIDETONE MIXER LOUDSPEAKER
TEA7091
LINE
VS
VCC
30
26
VREF
25
Figure 1: Block Diagram.
IREF
29
IREF
VREF
SLPE
31
LSIN
5
REOUT
20
GREC
37
EAR+
35
+
EARPHONE
EARPHONE AMPLIFIER
EAR-
36
-1
ACFF1 CURRENT CONTROL BLOCK SERIAL REGULATOR SQUELCH ANTILARSEN EXTERNAL P TX_AMP AGC LOGIC POWER CONTROL RING INDICATOR CONTROL
18
MUTE
TEA 7091
38 OUTPUT POWER RING SIGNAL OPTIMIZATION 41 VZP RCO
+RING
ACFSL
17
SOFTL
28
VL
TSOFT
27
SOFTCLIPPING
MIC2
24
40 SWITCH MODE POWER SUPPLY 39
RSU SWP
MICROPHONE
MIC1
23
HFIN
22
GTR PON & RESET CONTROL
21
DTMF
7
DAC LF
DAC HF
+
MUTE
GND BEEP MICROCONTROLLER INTERFACE
32 RING MELODY GENERATOR LOGIC CONTROL OSCILLATOR
GND
43
DTMF GENERATOR
14 DATA CLK ILL ISL
13
33
34
2 VMC
6 VRMC
12 PON
11 RESET
10 RI
9 OSC 3.58 MHz
D93TL020A
VLS
TEA7091
PLCC44 PACKAGE MECHANICAL DATA
DIM. MIN. A B C D d1 d2 E e e3 F F1 G M M1 1.16 1.14 14.99 1.27 12.7 0.46 0.71 0.101 0.046 0.045 17.4 16.51 3.65 4.2 2.59 0.68 16 0.590 0.050 0.500 0.018 0.028 0.004 mm TYP. MAX. 17.65 16.65 3.7 4.57 2.74 MIN. 0.685 0.650 0.144 0.165 0.102 0.027 0.630 inch TYP. MAX. 0.695 0.656 0.146 0.180 0.108
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TEA7091
PQFP44 PACKAGE MECHANICAL DATA
DIM. MIN. A A1 A2 B C D D1 D3 e E E1 E3 L L1 K 0.65 16.95 13.90 0.25 2.55 0.35 0.13 16.95 13.90 17.20 14.00 10.00 1.00 17.20 14.00 10.00 0.80 1.60 0(min.), 7(max.) 0.95 0.025 17.45 14.10 0.667 0.547 2.80 3.05 0.50 0.23 17.45 14.10 mm TYP. MAX. 3.40 0.0098 0.100 0.0138 0.005 0.667 0.547 0.677 0.551 0.394 0.039 0.677 0.551 0.394 0.0315 0.063 0.0374 0.687 0.555 0.110 0.120 0.0197 0.009 0.687 0.555 MIN. inch TYP. MAX. 0.134
D D1 D3 A1
33 34 23 22
0.10mm .004 Seating Plane
A A2
E3
E1
B
44 1 11
12
E
B C K
e L1
PQFP44
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L
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. (c) 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.
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