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TEA7089 Fiches technique(PDF) 2 Page - STMicroelectronics

No de pièce TEA7089
Description  LOW-RANGE PHONE DEDICATED CHIP
Download  17 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA7089 Fiches technique(HTML) 2 Page - STMicroelectronics

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PIN DESCRIPTION
Name
Pin N
°
Description
SOFT
1
Transmit Softclipping Time Constant
RECIN
2
Receiving Input
SN
3
Sidetone Network Input
AGC
4
Line Current Regulation Stop Value
MIC1
5
Microphone Input
MIC2
6
Microphone Input
GTR
7
Transmit Gain Adjustment
VCC
8
Transmit and Receive Part Power Supply
GND
9
Ground
IVLS
10
Line Current Source Power Supply
VS
11
Voltage Stabilizer
VL
12
Positive Line
VMC
13
Unregulated Microcontroller Power Supply
GREC
14
Receive Gain Adjustment
EAR-
15
Negative Earphone Output
EAR+
16
Positive Earphone Output
BUZ
17
Ringer Buzzer Output
VRING
18
Ring Power Supply
RES
19
Reset
PON
20
Power On
RI
21
Ring Indicator
OSC
22
Oscillator Input
MSK
23
Mask, Ring Melody Input
DATA
24
Data Input
DCL
25
Data Clock Input
VRMC
26
Microcontroller Stabilized Power Supply
VREF
27
Reference Voltage (VCC/2)
DTMF
28
DTMF Filter
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 removed by 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
TEA7089A ringer. 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 TEA7089A.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
TEA7089A.The power supply is specifically designed
to copewitha longflash or a long groundkey duration.
The TEA7089A 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 TEA7089A.
The microcontroller drives the TEA7089A through
a 2 wires serial interface.
TEA7089A
2/17


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