cxa1897q Sony Electronics, cxa1897q Datasheet - Page 5

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

Pin
No.
31 AGC OUT2
30 D RECIN2
28 D PBIN2
10 NRSW
6
7
9
8
AGC OUT1
D RECIN1
D PBIN1
D IREF
Symbol
DC
voltage
OPEN)
4.0V
4.0V
4.0V
1.2V
2.5V
(For
I/O
—
O
I
I
I
I/O
resistance
147
40k
40k
53k
—
10
31
6
GND
GND
Vcc
Vcc
28
30
8
7
9
147 50k
147
GND
GND
Vcc
Vcc
2
Equivalent circuit
5k
147
147
4
GND
40k
—5—
500
500
VGS
2
5k
15k
21k
4k
Vcc
5k
4
10k
15k
VGS
Vcc
VGS
Vcc
Vcc
AGC output pin.
Dolby NR recording
(encoding) input pin.
Dolby NR playback (decoding)
input pin.
Connects the 18k resistor for
providing the reference
current of the Dolby NR
section internal filter.
Dolby NR ON/OFF switch.
Low :
Medium :OFF
High :
ON
1.7 times normal
speed
Description
CXA1897Q