CXA2525AN Ver la hoja de datos (PDF) - Sony Semiconductor

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componentes Descripción

Fabricante

CXA2525AN

RF Amplifier for CD Player and CD-ROM

Sony Semiconductor 

CXA2525AM/AN

Tracking Error Amplifier

Each signal current from the photodiodes E and F is I-V converted and input to Pins 8 and 9. These signals

undergo operational amplification at the tracking error amplifier and tracking drive amplifier, and are output to

Pin 12.

11P

VC

5P

E

I-V

8

F

I-V

9

112k

320k

73.4k

TE

44k

12

VC

44k

112k

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

VTE =

112k

44k

×

320k

73.4k

× (F – E)

= 11.1 × (F – E)

Center Voltage Generation Circuit

The center voltage of VR = (VCC + GND) is supplied.

The maximum current is approximately ±3mA.

Vcc

Vcc

40k

Vc Buffer

25 VR

10

VC

40k

APC Circuit

When the laser diode is driven with constant current, the optical output possesses large negative temperature

characteristics. Therefore, the current must be controlled with the monitor photodiode to ensure the output

remains constant. When APC_ON pin is connected to GND, APC is ON; connected to VCC, it is OFF.

PD

2

VCC

100µ

56k

22

10k

1k LD

1

55k

56k

10k

10k

1.25V

10µH

1µ

100

500

– 11 –

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