u3762mb ETC-unknow, u3762mb Datasheet - Page 5

• Manufacturer Part Number: u3762mb
• Description: Universal Telephone Functions Integrated
• Manufacturer: ETC-unknow

Rev. A1, 15-Sep-98
Pin
12
13
14
15
16
17
18
11
Symbol
MFIND
MIC 1
MIC 2
MICO
GND
RDC
TIN
VL
Output switches to low being in temporary
DTMF mode. Reset by on hook condition.
Ground
Inverting input of microphone amplifier
Non-inverting input of microphone amplifier
Transmit pre-amp output which is normally
capacitively coupled to Pin TIN
Positive supply voltage input to the device.
The current through this pin is modulated by
the transmit signal.
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
to 100
transmit output voltage swing at the expense
of low-voltage operation.
Input to the line output driver amplifier.
Transmit AGC applied to this stage.
W
W
for low-voltage operation. Values up
may be used to increase the available
Preliminary Information
Function
AGC
MICO
RDC
MFIND
RDC
VL
MIC1
MIC2
TIN
PD
Configuration
Ê
16V
PD
50K
50K
VDD
U3762MB
1V
PD
1V
16V
PD
PD
5.6K
Ê
Ê
Ê
Ê
Ê Ê Ê Ê
VI
VI
16K
1V
PD
PD
Ê
Ê
MFIND
5 (23)
VI
PD
PD
1V
Ê
VL