Datasheet TEA7091 Datasheet (SGS Thomson Microelectronics)

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
SOFTWAR E PROGRAMMABLE

SOFTCLIPPING ON Tx CHANNEL
SQUELCH TO REDUCE Tx NOISE ENVI-

ROMENT AND TO IMPROVE HOWLING IM­MUNITY IN LOUDHEARING MODE

RECEIVING AMPLIFIER FOR PIEZO OR
ELECTRO DYNAMIC TRANS DUCE RS

+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

TEA7091

TELEPHONE ANALOG FRONT END

PRODUCT PREVIEW

PLCC44

PQFP44

PLY TO FEED THE LOUDSP EAKER AMPLI­FIER DURING RING MODE

DIGITAL VOLUME CONTROL (8 STEPS OF
4dB EACH) THROUGH MICROCONTROL­LER BUS

RING FREQUENCY GENERATOR PRO­GRAMMED THROUGH MICROCONTROL­LER BUS

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

ANTIL ARSEN A TTENUAT ION ( 4 DIF FEREN T
LEVELS) PROGRAMMABLE THROUGH MI­CROCONT RO LLER BUS

HANDSFRE E INTERF ACE

PIN AND SOFTWARE FACILITY FOR EASY
INTERCONNECTION WITH HANDSFREE
CONTRO L LE R IC.

RING ON LOUDSPEAKER

EMBEDDED SWITCH MODE POWER SUP-

September 1993

This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

DIALLING

DTMF GENERATOR (CONTROLLED BY
MCU BUS)

DC MASK VALUE DURING MAKE PERIOD
PROGRAMMABLE THROUGH MICROCON­TROLLER BUS

MICROCO NTR OL LER INTE RF ACE

STABILIZED VOLTAGE FOR MICROCON­TROLLER

2 WIRE SERIAL BUS
RING INDICATOR
POWER-ON SIGNAL
RESET SIGNAL
LINE CURRENT VARIATION INDICATO R

SELF BIASED LOUDSPEAKER AMPLIFIER FOR
ANSWER ING MA CHIN E

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TEA7091

DESCRIP TION

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), E lectronic Hook Switch and upgraded

PINS CON NE CT ION (T op views)

SWP

RSU

RCO

GNDP

LSOUT

VLS

VMC

VREFL

LSIN

LSSOF

DTMF

VRMC

OSC

RI/VI

RESET

N.C.

7

8

9

VL

10

11

12

13

14

15

16

17

VZP

123564

PLCC44

2322211918 20 28272624 25

GREC

EAR-

EAR+

ISL

40414244 43

39

ILL

38

GNDA

37

SLP

36

VS

35

IREF

34

SOFTL

33

TSOFT

32

VCC

31

VREF

30

MIC2

29

MIC1

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 microcont roller.

– Replacement of configuration switches (PABX

/Public, Tone/Pulse...) by EEPROM set tings.

This also induces reliability and cost improve­ment.

LSOUT

GNDP

N.C.

RCO

SWP

RSU

VZP

GREC

EAR-

EAR+

ISL

44 43 42 41 3940 38 37 36 35 34

VLS

VMC

VREFL

LSIN

LSSOF

DTMF

VRMC

OSC.

RI/VI

RESET

1

2

3

VL

4

5

6

7

8

9

10

12 13 14 15 16

PQFP44

171118 19 20 21 22

ILL

33

GNDA

32

SLP

31

VS

30

IREF

29

SOFTL

28

TSOFT

27

VCC

26

VREF

25

MIC2

24

MIC1

23

PON

CLK

DATA

SNSL

SNLL

ACFSL

ACFFI

RECIN

REOUT

GTR

HFIN

D93TL010

PON

CLK

DATA

SNSL

SNLL

ACFSL

ACFFI

RECIN

REOUT

GTR

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

Operating Temperature – 25 to +70 °C
Storage Temperature – 55 to +150 °C
Supply Voltage (pin 3) 12 V
Supply Current 150 mA
CMOS part supply (Pin 8) 6 V
Junction Temperature – 25 to +150 °C

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V

T

op

T

stg

V

LM

I

LM

REGM

T

j

HFIN

D93TL011

PIN DESCRIPTIONS

TEA7091

PQFP44

o

N

Pins

1 7 VLS Loudspeaker power supply.
2 8 VMC Unregulated microcontroller supply.
3 9 VL Line voltage.
4 10 VREFL Loudspeaker reference voltage.
5 11 LSIN Loudspeaker input.
6 12 LSSOF Loudspeaker softclipping time constatnt.
7 13 DTMF DTMF filter.
8 14 VRMC Stabilized microcontroller supply.

9 15 OSC Oscillator input.
10 16 RI/VI Ring indicator / Line current variation indicator.
11 17 RESET Microcontroller reset.
12 18 PON Power on output.
13 19 CLK Clock data input.
14 20 DATA Data Input.
15 21 SNSL Short line sidetone input.
16 22 SNLL 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 29 MIC1 Microphone input.
24 30 MIC2 Microphone input.
25 31 VREF Transmit and receive reference voltage (VCC/2).
26 32 VCC Transmit and receive power supply.
27 33 TSOFT Transmit soft-clipping time constant.
28 34 SOFTL Maximum AC signal (Softclipping threshold).
29 35 IREF Internal reference current.
30 36 VS Shunt regulator capacitor.
31 37 SLP DC mask slope.
32 38 GNDA Analog Ground (signal).
33 39 ILL Line current regulation start up.
34 40 ISL Line current regulation stop.
35 41 EAR+ Positive earphone output.
36 42 EAR– Negative earphone output.
37 43 GREC Receive gain adjustment.
38 44 VZP Switch mode power supply internal zener.
39 1 SWP Switch mode power supply output.
40 2 RSU Ring start up level.
41 3 RCO Ring capacitor optimization (output power).
42 4 N.C. Not Connected.
43 5 GNDP Power Ground.
44 6 LSOUT Loudspeaker Output.

PLCC44

No Pins

Names Functions

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TEA7091

Figure 1: Block Diagram.

VLS

VCC

VLS

SNLL

SNSL

RECIN

VL

VREFL

4

VREFL

VOLTAGE PEAK DETECT

1

& OUT TX

LOUDSPEAKER

POWER SUPPLY

16

15

19

3

LSOUT

5 LSSOF

44

POWER

VOLUME

STAGE

ANTIDISTORTION

AGC

VREF

STAGE

CONTROL

STAGE

MIXER

SIDETONE

AGC

+RING

LOUDSPEAKER

TEA 7091

SERIAL

REGULATOR

CURRENT

CONTROL

41 RCO

38 VZP

RING SIGNAL

OPTIMIZATION

OUTPUT POWER

EXTERNAL µP

BLOCK

SQUELCH

ANTILARSEN

39 SWP

40 RSU

POWER

SUPPLY

SWITCH MODE

RING

CONTROL

INDICATOR

CONTROL

LOGIC POWER

TX_AMP

AGC

PON &

RESET

CONTROL

MUTE

+

VLS

9

OSCILLATOR

RING MELODY

MICROCONTROLLER

BEEP

OSC

GENERATOR

RI

10

LOGIC CONTROL

11

RESET

12

PON

6

VRMC

2

VMC

34

ISL

33

ILL

13

INTERFACE

CLK

14

DATA

3.58 MHz

D93TL020A

4/7

LINE

VCC

VS

-1

AMPLIFIER

EARPHONE

EAR- 36

EAR-

PHONE

MUTE

ACFF1 18

26

-

30

IREF VREF VSTAB

LSIN 5

IREF 29

SLPE 31

VREF 25

REOUT 20

+

EAR+ 35

GREC 37

VL

SOFTCLIPPING

27

HFIN 22

MIC2 24

TSOFT

MIC1 23

PHONE

MICRO-

SOFTL 28

ACFSL 17

DAC HF

DAC LF

DTMF GENERATOR

GTR 21

GND 32

DTMF 7

GND 43

PLCC44 PACKAGE MECHANICAL DATA

TEA7091

DIM.

MIN. TYP. 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 0.68 0.027

E 14.99 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

mm inch

5/7

TEA7091

PQFP44 PACKAG E ME CHANICAL DAT A

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 3.40 0.134
A1 0.25 0.0098
A2 2.55 2.80 3.05 0.100 0.110 0.120

B 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

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 0.394

L 0.65 0.80 0.95 0.025 0.0315 0.0374

L1 1.60 0.063

K 0°(min.), 7°(max.)

D

D1

A1

2333

34

B

44

1

e

11

PQFP44

22

L1

E

L

E3D3E1

12

0.10mm
.004

Seating Plane

B

K

A

A2

C

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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

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