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參數(shù)資料
| 型號： | U3762MB |
| 英文描述： | Stellaris Programming Services |
| 中文描述： | 通用電話芯片-所有的功能集成 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大?。?/td> | 248K |
| 代理商： | U3762MB |
U3762MB
Preliminary Information
Rev. A1, 15-Sep-98
5 (23)
Configuration
Function
Symbol
Pin
11
MFIND
Output switches to low being in temporary
DTMF mode. Reset by on hook condition.
VDD
MFIND
ê
PD
MFIND
12
GND
Ground
13
14
MIC 1
MIC 2
Inverting input of microphone amplifier
Non-inverting input of microphone amplifier
MIC2
VI
MIC1
ê
ê
ê
PD
PD
1V
1V
50K
50K
15
MICO
Transmit pre-amp output which is normally
capacitively coupled to Pin TIN
VI
MICO
ê
ê
ê
PD
16K
16
VL
Positive supply voltage input to the device.
The current through this pin is modulated by
the transmit signal.
VL
RDC
PD
PD
16V
17
RDC
An external resistor (1 W) is required from
this pin to GND to control the DC input im-
pedance of the circuit. It has a nominal value
of 39 for low-voltage operation. Values up
to 100 may be used to increase the available
transmit output voltage swing at the expense
of low-voltage operation.
RDC
AGC
VL
ê
PD
PD
18
TIN
Input to the line output driver amplifier.
Transmit AGC applied to this stage.
TIN
êê
êê
PD
5.6K
16V
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