AN8807SB 参数 Datasheet PDF下载

ICs for CD/CD-ROM Player

AN8807SB

The VCBA is for focus balance adjustment. Connecting 47kΩ of external resistance toPin299, signal ratio between A+C and

B+D can be controlled as shown in Table 1.

Table 1

V

C

1.5V

2.5V

3.5V

A+C

B+D

0.14

1.0

7.0

B+D

A+C

7.0

1.0

0.14

• Tracking Error Amplifier

As shown in Figure 3, the tracking error amplifier receives the output currents E and F of three-beam method pin photo diode

for sub-beam detection, and outputs the operation result of E–F to TEOUT (Pin25).

V

REF

32

470kΩ

f

C

6100kHz

E

33

–

VCBA

+

Subtraction

V

REF

31

470kΩ

26

–

25

+

F

34

–

VCBA

20kΩ

+

30

–

+

Figure 3 : Tracking Error Amplifier