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CXA1998

Recording/Playback Equalizer Amplifier

Sony Semiconductor 

CXA1998AQ

Pin

No.

Symbol

DC

voltage

I/O

I/O

resistance

36 RFC

8.0V — —

37 IREF

48 FP CAL

1.2V — —

Equivalent circuit

VCC

×3

VCC

×3

36

147

GND

Vcc

× 250

To each RFS

Vcc

×2

37

48 147

GND

GND

Description

Connects a resistor

and capacitor for

obtaining stable

voltage with power

supply ripple rejected.

Connects a resistor

(12kΩ) for determining

equalizer gains.

Connects a resistor for

determining the high-

band peak frequency

of recording equalizer.

Reference setting

resistance is 27kΩ.

38 PB OUT2

47 PB OUT1

2.8V

Vcc

×3

500

38

O 147Ω 47

147

500

×6

15p

GND

GND

Vcc

Playback equalizer

output.

39 PB FB22

46 PB FB21

2.8V

——

VCC

147

39

46

2k

×4

7k × 3

×3

RFS

2k

×4

Connects a capacitor

for determining

playback equalizer

time constants, such

as 120µs and 70µs.

GND

GND

GND

–8–

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