CXA2557 查看數據表（PDF） - Sony Semiconductor

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CXA2557

RF Amplifier for CD Player/CD-ROM

Sony Semiconductor 

Pin

No.

Symbol

I/O

32 RW SW I

CXA2557R

Equivalent circuit

15k 40k

80k

15k

Description

20k 20k

20k

60k

124

32

CD-ROM/RW switching input.

RW when connected to VCC,

ROM when connected to GND.

15k 40k

80k

15k

33

AGC

SW

I

15k 20k

15k

60k

33

124 80k

40k 15k

34

15k

34 MODE 1 I

80k 15k

40k

15k

80k 15k

40k

15k

35 MODE 2 I

80k 15k

35

40k

15k

–8–

AGC/VCA switching input.

AGC when connected to VCC,

VCA when connected to GND.

Double-speed mode switching

pins.

MODE 1 MODE 2 fc

L

X

×n

L

× 2n

M

M

× 4n

H

× 6n

H

X

×N

∗ X = L or M or H

n is determined by the external

resistor connected to Pin 44.

N is determined by the external

resistor connected to Pin 45

and the Pin 43 input voltage.

Pin 34 also serves as switching

pin for the tracking error

amplifier cut-off frequency and

RFO2 output ON/OFF switching

pin.

MODE 1 MODE 2 fc

L

20kHz ON

M

250kHz OFF

H

∗ L = GND, M = VC, H = VCC

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