cxa1897q Sony Electronics, cxa1897q Datasheet - Page 4

• Manufacturer Part Number: cxa1897q
• Description: Dolby B Type Noise Reduction System With Recording/playback Equalizer
• Manufacturer: Sony Electronics

Pin Description
Pin
No.
32 AGC IN2
1
2
3
4
5
Vcc
RFC
AMS OUT
AMS GAIN 2.8V
AGC IN1
Symbol
DC
voltage
8.0V
8.0V
8.0V
4.0V
I/O
—
—
—
O
I
I/O
resistance
50k
—
—
—
—
4
32
5
2
GND
GND
Vcc
Vcc
GND
Vcc
3
147
1
GND
147
Vcc
Equivalent circuit
147
—4—
10k
2
147
40k
3
3
VGS
2
4
5p
10k
Vcc
to RFS
250
Vcc
Vcc
Vcc
(Ta=25°C, Vcc=8 V, no signals)
Power supply pin.
Connects the resistor and
capacitor for providing a ripple
eliminated stable voltage in
the power supply.
AMS output pin.
Connects the resistor and
capacitor which determine the
attack and recovery time
constants of the output to Vcc.
No signal supplied
level
Signal supplied
Connects the resistor which
determines the AMS signal
detection level.
AGC signal input pin.
The input resistance varies
from 50k to 10k .
AGC is applied when a signal
of –30dB or more level is input
to AGC.
(Pin 33 external 47µF //
300k )
Description
Low level
CXA1897Q
High