LA8638NV
Pin Descriptions
Pin Number
1
Pin Name
GND
Pin Voltage
2
1/2 VCC
VCC/2
29
VREF
VCC/2
3
CMP-NF
VCC/2
Equivalent Circuit
VCC
2
+
–
VREF
+
IN
–
45kΩ
29
A13523
VCC
22.5kΩ 22.5kΩ
3
A13524
REGURATOR VREF2 +
4
DT-VREF
1.25 V
4
–
5
RX-IN
1.25 V power
supply
6
RX-FIL-OUT
1.25 V
5
+
500Ω
–
A13525
TO DTSH IN
6
100kΩ
A13526
VREF
7
EXP-IN
VCC/2
7
30kΩ
VCC
VREF
+
8
Indeterminate
8
EXP-RCT (when there is
no signal)
–
15kΩ
Description
Ground for all circuits except BTL amplifier
Resistance voltage divider pin
Reference voltage for all circuits except
receiver block
AC feedback control for compressor's
summing amplifier
DC gain: 1 AC gain: Infinite
Reference voltage for receiver block.
This supplies the bias voltage for pin 5.
Filter buffer input
Filter buffer output
Expander input. Voltage-current converter
input. Full-wave rectifier input.
Full-wave rectifier output for expander block
(AC smoothing)
A13527
9
RX-ATT-ADJ
0.03 V
BIAS CIRCUIT
VCA
ATT CIRCUIT
Pin for setting attenuation for receiver output
level switching
9
A13528
10
RX-OUT
VCC/2
VREF
IN
+
–
60kΩ
10
Receiver block output
A13529
Continued on next page.
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