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CXA1897Q Datasheet(PDF) 7 Page - Sony Corporation

Part # CXA1897Q
Description  Dolby B Type Noise Reduction System with Recording/Playback Equalizer
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Manufacturer  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA1897Q Datasheet(HTML) 7 Page - Sony Corporation

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—7—
CXA1897Q
Pin
Symbol
DC
I/O
I/O
Equivalent circuit
Description
No.
voltage
resistance
15 DECK AB
I
16 A EQ
20 SPEED
27 MODE
17 B EQ
2.5V
I
53k
(For
OPEN)
18 REC OUT1
4.0V
O
147
19 REC OUT2
15
Playback input deck A/B
selector switch
Low : PB INA
High : PB INB
16
Deck A equalizer selector
switch.
Low : 120µs EQ
High : 70µs EQ
20
Recording/playback
equalizer speed selector
switch.
Low : Normal speed
High : High speed
(1.7 times normal speed)
27
Dolby NR mode selector
switch.
Low : Recording
(encoding)
High : Playback (decoding)
Deck B equalizer selector
switch.
Low :
Normal tape, 120µs
EQ
Medium : CrO2 tape, 70µs EQ
High :
Metal tape, 70µs
EQ
Recording equalizer output.
20
15
27
Vcc
GND
147
Vcc
GND
16
Vcc
GND
147 50k
5k
5k
GND
Vcc
17
19
Vcc
GND
147
500
GND
Vcc
500
×3
×10
×2
40k
5p
18


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