cxa1897q Sony Electronics, cxa1897q Datasheet - Page 7

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

Pin
No.
15 DECK AB
16 A EQ
20 SPEED
27 MODE
17 B EQ
18 REC OUT1
19 REC OUT2
Symbol
DC
voltage
OPEN)
2.5V
4.0V
(For
—
I/O I/O
O
I
I
resistance
53k
147
—
17
GND
Vcc
15
16
20
27
18
19
147 50k
GND
GND
Vcc
Vcc
147
Equivalent circuit
147
5k
GND
500
—7—
10
GND
3
5k
500
2
GND
Vcc
40k
Vcc
5p
Vcc
15
16
20
27
Deck B equalizer selector
switch.
Low :
Medium : CrO
High :
Recording equalizer output.
Playback input deck A/B
selector switch
Low : PB INA
High : PB INB
Deck A equalizer selector
switch.
Low : 120µs EQ
High : 70µs EQ
R e c o r d i n g / p l a y b a c k
equalizer speed selector
switch.
Low : Normal speed
High : High speed
(1.7 times normal speed)
Dolby NR mode selector
switch.
Low : Recording
High : Playback (decoding)
(encoding)
Normal tape, 120µs
EQ
Metal tape, 70µs
EQ
Description
2
tape, 70µs EQ
CXA1897Q