CXA2542Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA2542Q

RF Signal Processing Servo Amplifier for CD Player

Sony Semiconductor 

CXA2542Q

Description of Functions

RF Amplifier

The photodiode currents input to the input pins (PD1 and PD2) are each I-V converted through a 58kΩ

equivalent resistor by the PD I-V amplifiers. These signals are added by the RF summing amplifier, and the

photodiode (A + B + C + D) current-voltage converted voltage is output to the RFO pin. An eye-pattern check

can be performed at this pin.

1k

3.3µ

A

PD1

C

36

iPD1→

58k

VA 10k

B

PD1 IV AMP

VC

58k

PD2

D

37

iPD2→

VB 10k

PD2 IV AMP

VC

22k

RF_M

32

RF_O

31

RF SUMMING AMP

VC

The low frequency component of the RFO output voltage is VRFO = –2.2 × (VA + VB) = 127.6kΩ × (iPD1 + iPD2).

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