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TEA7088A डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - LOW-RANGE PHONE DEDICATED CHIP - ST Microelectronics

भाग संख्या TEA7088A
समारोह LOW-RANGE PHONE DEDICATED CHIP
मैन्युफैक्चरर्स ST Microelectronics 
लोगो ST Microelectronics लोगो 
पूर्व दर्शन
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<?=TEA7088A?> डेटा पत्रक पीडीएफ

TEA7088A pdf
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

विन्यास 17 पेज
डाउनलोड[ TEA7088A Datasheet.PDF ]


शेयर लिंक


अनुशंसा डेटापत्रक

भाग संख्याविवरणविनिर्माण
TEA7088ALOW-RANGE PHONE DEDICATED CHIPST Microelectronics
ST Microelectronics


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