DEDICATED CHIP. TEA7088A Datasheet

TEA7088A CHIP. Datasheet pdf. Equivalent

Part TEA7088A
Description LOW-RANGE PHONE DEDICATED CHIP
Feature TEA7088A LOW-RANGE PHONE DEDICATED CHIP . . . . . . . RING - GENERATION OF 8 MELODY TONES (Includi.
Manufacture ST Microelectronics
Datasheet
Download TEA7088A Datasheet

TEA7088A LOW-RANGE PHONE DEDICATED CHIP . . . . . . . RING TEA7088A Datasheet
Recommendation Recommendation Datasheet TEA7088A Datasheet




TEA7088A
TEA7088A
LOW-RANGE PHONE DEDICATED CHIP
. RING
- GENERATION OF 8 MELODY TONES
(Including the 3 German Melody Tones)
. - 4 STEPS DIGITAL CONTROL ON THE AM-
PLIFIER OUTPUT LEVEL
SPEECH
- TRANSMIT GAINEXTERNALLY ADJUSTABLE
- RECEIVINGGAINEXTERNALLYADJUSTABLE
- AGCSLOPEEXTERNALLYPROGRAMMABLE
- SOFTCLIPPING ON SENDING CHANNEL
- RECEIVE AMPLIFIER FOR PIEZO OR
ELECTRODYNAMIC TRANSDUCER
. - +6dB MODE ON RECEIVE CHANNEL
- LINE POWER MANAGEMENT
DIALING
- DTMF GENERATOR
- LOW DC MASK DURING MAKE PERIOD
. THROUGH MICROCONTROLLER SERIAL
BUS INTERFACE
MICROCONTROLLER INTERFACE
- 1.79MHz CLOCK OR 3.58MHz OSCILLATOR
INPUT
. MICROCONTROLLER POWER SUPPLY
. MICROCONTROLLER CONTROL INTER-
FACE INCLUDING SERIAL BUS
. LINE CURRENT EXTRACTOR FOR SUPPLY
OF EXTERNAL PERIPHERALS
SO28
(Plastic Package)
ORDER CODE : TEA7088AFP
PIN CONNECTIONS
S OFT
RECIN
SN
AGC
1
2
3
4
28 DTMF
27 VREF
26 VRMC
25 DCL
MIC1
5
24 DATA
MIC2
6
23 MSK
GTR
7
22 OSC
DESCRIPTION
The TEA7088A is a Telephone Analog Front End
device, TAFE, which integrates the three basic
functions of a standard telephone set :
- Speech network,
- DTMF generator,
- Ringer generator on buzzer.
A complete telephone set can be designed using
TEA7088A associated with a low cost microcon-
troller.
VCC
GND
IVLS
VS
VL
VMC
GREC
8
9
10
11
12
13
14
21 RI
20 PON
19 RES
18 VRING
17 BUZ
16 EAR+
15 EAR-
January 1998
1/17



TEA7088A
TEA7088A
SPEECH
The speech network includes :
- a low noise transmit channel suitable for any kind
of microphone transducer. Softclipping on trans-
mit line signal is provided by the chip.
- a low noise receive channel with symmetrical
outputs to be compatible with both piezoceramic
and electrodynamic earpiece. An additional 6dB
gain can be inserted in the receive channel
through software control.
- a line length gain control (AGC) with starting point
of gain regulation fixed at 25mAline current ; slope
of gain regulationis externallyadjustablewith one
resistor.AGC can be removedby hardware (maxi-
mum gain flat) or by software (-2dB flat).
The phone impedance and sidetone can be tuned
through external networks.
DTMF GENERATOR
The onboard DTMF generator fullfils the CEPT
requirements with an external single pole filter.
RINGER
Up to 8 different tones can be generated by the
TEA7088Aringer. The digital volume control of the
ringer can be performed through a specific com-
mand (4 steps). A ring indication signal is provided
to the microcontroller by the TEA7088A.If more
tones are requested the input RM/MSK allows to
inject tones generated by the microcontroller.
FURTHER ADVANTAGES
The microcontroller power supply is provided by the
TEA7088A.The power supply is specifically designed
to copewitha longflash or a long groundkey duration.
The TEA7088A is able to supply the necessary
current to an external speakerphone circuit
TEA7540 and loudspea ker amplifier TEA7532
without any additional circuitry.
Line current and reset indications are provided to
the microcontroller by the TEA7088A.
The microcontroller drives the TEA7088A through
a 2 wires serial interface.
PIN DESCRIPTION
Name
SOFT
RECIN
SN
AGC
MIC1
MIC2
GTR
VCC
GND
IVLS
VS
VL
VMC
GREC
EAR-
EAR+
BUZ
VRING
RES
PON
RI
OSC
MSK
DATA
DCL
VRMC
VREF
DTMF
Pin N°
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
2/17
Description
Transmit Softclipping Time Constant
Receiving Input
Sidetone Network Input
Line Current Regulation Stop Value
Microphone Input
Microphone Input
Transmit Gain Adjustment
Transmit and Receive Part Power Supply
Ground
Line Current Source Power Supply
Voltage Stabilizer
Positive Line
Unregulated Microcontroller Power Supply
Receive Gain Adjustment
Negative Earphone Output
Positive Earphone Output
Ringer Buzzer Output
Ring Power Supply
Reset
Power On
Ring Indicator
Oscillator Input
Mask, Ring Melody Input
Data Input
Data Clock Input
Microcontroller Stabilized Power Supply
Reference Voltage (VCC/2)
DTMF Filter





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