STMICROELECTRONICS TEA7091

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
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.
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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
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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
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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
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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