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參數(shù)資料
| 型號： | TEA7088A |
| 廠商： | 意法半導體 |
| 英文描述： | LOW-RANGE PHONE DEDICATED CHIP |
| 中文描述： | 低檔手機專用芯片 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 184K |
| 代理商： | TEA7088A |
TheStart Up Conditions of the TEA7088A
Assoonas RESETis highand beforesendingany
code the circuit is in the followingdefault configu-
ration :
- Speech
- No mask
- AGC ON in transmitand receive channels
- Normalgain on receive channel
- 1.79MHz input clock (oscillator in standby)
6 bit Codes
Between two DTMF or ring frequencies,introduc-
ing a Mute or speech code implies to wait 1ms to
end the sinewave or square period.
DTMF Dialing
To dial in DTMF the following sequence of codes
must be sent :
DTMF Frequencycode : 00XXXX
Dialing Mode code
: 010001
Mute or SPEECHcode : 010010 or 010000
The duration of the DTMF signal is fixed by the
delay between Dialing mode code and MUTE or
SPEECHcode.
PulseDialing
The pulse dialing function is performed by the
microcontroller through the high voltage stage.
The ”MAKE” voltage over the TEA7088A during
dialing can be reduced by sending the mask code
0010101.To recover the normalspeechvoltageat
the end of dialing the mask code must be sent
again.
If the mask code is not used the voltage over the
TEA7088Aduringdialing is thesame as in speech
mode.
Ring Indicator(RI)
In ring mode TEA7088A generates a high logic
levelon PinRI as soonasthevoltageon PinV
RING
is higherthanV
THRI
ON(19VTyp.),andthevoltage
on V
RMC
is higher than 3.4V.
When the voltage on V
RMC
becomes higher than
2.6V,RESET signal becomes also high.
Mask Input(MSK)
MSK inputmust be high by default (Figure 10).
In speech configuration forcing MSK input to low
level will have same functionality than the MASK
code.
For ring mode when it is necessary to send other
frequenciesthanthe 8basicones,thisinputallows
to drive the buzzer output.
MICROCONTROLLER INTERFACE WITH TEA7088A
(continued)
a0
a1
a2
a3
a4
a5
a6
t1
t2
t4
t5
CLK Data
Data
Synchro
Datas with a Change During CLK= 1
t3
t3
t0
t0, t1, t2, t3, t4, t5 > 1
μ
s
7
Figure 9 :
DATA/CLOCKTiming
I
L
MSK
PULSE MODE
OTHER MODES
OTHER MODES
FLASH MODE
7
Figure 10 :
MASKTiming
TEA7088A
10/17
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| TEA7089A | Low-Range Phone Dedicated Chip(電話模擬前端) |
| TEA7089 | LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089AFP | LOW-RANGE PHONE DEDICATED CHIP |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA7088AFP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089AFP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7091 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TELEPHONE ANALOG FRONT END |
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