– 10 –

CXA2550M/N

Tracking Error Amplifier

Each signal current from the photodiodes E and F is I-V converted and input to Pins 7 and 8 via a resistor

which determines the gain. The signal is amplified by the gain amplifier, operated by the tracking error

amplifier and then the (F-E) signal is output to Pin 11.

The balance adjustment is performed by varying the combined resistance value of the feedback resistors,

which are T type-configured at the E I-V amplifier, by using the external resistance value of EI pin.

= 403k

Ω

Leave EI pin open when the balance adjustment is not executed in this IC.

The gain for F I-V and E I-V amplifiers becomes the same when EI pin is left open.

11

I-V

F

30k

I-V

E

7

8

12p

26k

96k

96k

12p

26k

9

TE

30k

EI

22k

4.7k

270k

220k

220k