CXA2647 View Datasheet(PDF) - Sony Semiconductor

Part Name

Description

Manufacturer

CXA2647

RF Signal Processor for CD Players

Sony Semiconductor 

CXA2647N

• Focus Error

The signals input to the A and C pins and the B and D pins are arithmetically amplified and the focus error

signal is output.

This circuit has ROM/RW switching and offset addition functions.

VC

100k

ROM

23.5k

A6

30k

C8

30k

B7

30k

D9

ROM

VOFST

RW

30k

47k

200k

FE = Gain { (B + D) – (A + C) }

Low frequency gain ROM: 15.5dB

RW: 27.5dB

RW

100k

ROM

47k

RW

200k

FEI 17

124

50k

DVC

16 FE

124

Cut-off frequency fc (typ.) ROM: 400kHz

RW: 300kHz

• Tracking Error

The signals input to the E and F pins are arithmetically amplified and the tracking error signal is output.

This circuit has ROM/RW switching and offset addition functions.

VC

Control bias

VC – 1V to VC + 1V

TE_BAL 19

20k

F

11

gm

ROM

VOFST

VC

RW

20k

63k

251k

10k

63k ROM

251k RW

20k 10 E gm

VC

20k

10k

31.5k

125.5k

ROM RW

TE = Gain (F – E)

Low frequency gain ROM: 16dB

RW: 28dB

18 TE

TE balance adjustment

(F – E) low frequency gain = ±6dB

Cut-off frequency fc (typ.)

ROM: 200kHz

RW: 150kHz

VC

External resistance value vs. Low frequency gain for E and F input pins

22

15.5

12.5

10k

20k

30k

Resistance value [Ω]

– 11 –

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