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CXA2525AN

RF Amplifier for CD Player and CD-ROM

Sony Semiconductor 

CXA2525AM/AN

Note on Operation

The RF AC maximum output amplitude is 1.3 Vpp when Pin 13 and 14 are capacitor-coupled shown in

Application Circuit.

Description of Operation

RF Amplifier

The signal currents from the photodiodes A, B, C and D are I-V converted, and input to Pins 3, 4, 5 and 6.

These signals are added at the RF summing amplifier and inverted at the RF drive amplifier and then output to

Pin 14.

A

I-V

3

B

I-V

4

C

I-V

5

I-V

D6

390

1k 3.9k

1p

RF_ M

4.9k

RFO

17

14

10k

10k

10k

10k

2k

10k

VC RF

VC

RF Drive Amp

Summing Amp

68p

13p

LPF_SW BPF_SW

15

16

The low frequency component of RFO output voltage is as follows:

VRFO =

10k

10k

×

4.9k

2k

× (A + B + C + D)

= 2.45 × (A + B + C + D)

Focus Error Amplifier

The operation of (B + D) – (A + C) is performed and the resulting signal is output to Pin 12.

15P

348k

A

I-V

3

64k

FE

B

64k

I-V

4

12

Focus

C

64k

I-V

5

Error Amp

D

64k

I-V

6

348k

174k 15P

VC

The low frequency component of FE output voltage is as follows:

VFE =

348k

64k

× (B + D – A – C)

= 5.43 × (B + D – A + C)

– 10 –

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