u3760mb-n ATMEL Corporation, u3760mb-n Datasheet - Page 5

• Manufacturer Part Number: u3760mb-n
• Description: Low-voltage Standard Telephone Circuit
• Manufacturer: ATMEL Corporation

Rev. A1, 31-May-99
SSO44
13
14
15
16
17
18
19
20
Symbol
MUTE
MIC 1
MIC 2
MICO
RDC
TIN
VL
V
I
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
able transmit output voltage swing at the ex-
pense of low-voltage operation.
Input to the line output driver amplifier.
Transmit AGC applied to this stage.
This internal voltage bias line must be con-
nected to VL via an external resistor, R
which dominates the ac input impedance of
the circuit and should be 680
input impedance or 1.2 k for a 900
impedance.
Pin for testing
W
W
for low-voltage operation. Values up
may be used to increase the avail-
Preliminary Information
Function
for an 600
B
input
,
W
MUTE
AGC
MICO
RDC
RDC
VL
MIC1
MIC2
MIC2
TIN
PD
VI
U3760MB-N
Configuration
50K
50K
16V
PD
PD
PD
1V
1V
6.7V
16V
PD
PD
16V
5.6K
30K
Ê
Ê
Ê
Ê
Ê Ê Ê Ê
Ê
VI
VI
16K
MUTE
1V
Ê
Ê
Ê
PD
PD
5 (20)
VI
PD
VBG
PD
1V
Ê
VL