cxa1878q Sony Electronics, cxa1878q Datasheet - Page 9

• Manufacturer Part Number: cxa1878q
• Description: Dolby B-c Type Noise Reduction System With Recording/playback Equalizer Amplifier
• Manufacturer: Sony Electronics

No.
Pin
31
32
33
34
35
V
GP CAL
REC CAL
NR SW
S SW
EE
Symbol
Typical pin voltage
–7.0V
when
open
when
open
when
open
when
open
2.5V
2.5V
2.5V
2.5V
DC
AC
—
—
—
—
I/O Z (in)
I
I
I
I
54k
54k
50k
50k
33
34
35
– 9 –
32
54k
50k
DV
50k
DV
Equivalent circuit
CC
CC
54k
/2
/2
2k
2k
6k
6k
Negative power supply
Recording equalizer
amplifier high frequency
calibration
Recording equalizer
amplifier calibration
NR control
Dolby S type selection
Controlled with DC
voltages of 0 to 5V.
High: High frequency
Low : High frequency
Leave this pin open
when not using the
high frequency
calibration function.
Controlled with DC
voltages of 0 to 5V.
High: Recording level
Low : Recording level
Leave this pin open
when not using the
recording calibration
function.
High: C type
Medium: B type
Low: NR OFF
Select the calibration
mode with this pin.
High: CALIBRATION
Medium: B-C type
Low: S type
Description
level gain
increased
level gain
reduced
gain increased
gain reduced
CXA1878Q