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CXA1878Q

Dolby∗ B-C Type Noise Reduction System with Recording/Playback Equalizer Amplifier

Sony Semiconductor 

Pin

No.

Symbol

31 VEE

Typical pin voltage

I/O Z (in)

DC AC

–7.0V

Equivalent circuit

32 GP CAL

2.5V

when —

open

I 54kΩ

54k

32

2.5V

33 REC CAL when —

open

I 54kΩ

54k

33

CXA1878Q

Description

Negative power supply

Recording equalizer

amplifier high frequency

calibration

∗ Controlled with DC

voltages of 0 to 5V.

High: High frequency

level gain

increased

Low : High frequency

level gain

reduced

∗ Leave this pin open

when not using the

high frequency

calibration function.

Recording equalizer

amplifier calibration

∗ Controlled with DC

voltages of 0 to 5V.

High: Recording level

gain increased

Low : Recording level

gain reduced

∗ Leave this pin open

when not using the

recording calibration

function.

34 NR SW

2.5V

when —

open

I 50kΩ

34

50k

2k 6k

DVCC/2

NR control

High: C type

Medium: B type

Low: NR OFF

35 S SW

2.5V

when —

open

I 50kΩ

35

50k

2k 6k

DVCC/2

–9–

Dolby S type selection

∗ Select the calibration

mode with this pin.

High: CALIBRATION

Medium: B-C type

Low: S type

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