CXA2550M 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA2550M

RF Amplifier for CD Players

Sony Semiconductor 

CXA2550M/N

Description of Functions

RF Amplifier

The photodiode current input to the input pins (PD1, PD2) are current-to-voltage (I-V) converted by the

equivalent resistance of 58kΩ at PD I-V amplifiers, respectively. The signal is added by the RF summing

amplifier and then the I-V converted output voltage of the photodiode (A + B + C + D) is output to RFO pin.

This pin is used check the eye pattern.

GND

33k PD1

I-V

4

33k PD2

I-V

5

58k

VA 2k

Cp

5.5k

RFM

14

RFO

15

PD1 IV AMP

58k

VB 2k

RF SUMMING AMP

PD2 IV AMP

The frequency response of the RF output signal can be equalized by adding the capacitance (Cp) to RFI pin.

The low frequency component of the RFO output voltage is as follows;

VRFO = –2.75 × (VA + VB)

= 159.5kΩ × (iPD1 + iPD2)

Focus Error Amplifier

The difference between the RF I-V amplifier output VA and VB is obtained and the I-V converted voltage of the

photodiode (A + C – B – D) is output.

24p

VB 32k

– (B + D)

– (A + C)

VA 32k

87k

174k

24p

164k

13 FE

FE BIAS

12

VEE

VCC

47k

The FE output voltage (low frequency) is as follows;

VFE = 5.4 × (VA – VB)

= (iPD2 – iPD1) × 315kΩ

–9–

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