CXA2542AR
• Focus bias adjustment
The focus bias adjustment switches IFB1 to IFB6 can be controlled by setting D6 = 0 and D7 = 1. The switches
are set using D0 to D5.
At this time, SENS1 outputs FOH and SENS2 outputs FOL.
Data is set by specifying switch conditions D0 to D5 and sending a latch pulse with D6 = 0 and D7 = 1.
START
IFB1 to IFB6
Switch Control
SENS1/2
BIAS OK ?
NO
YES
Adjustment Completed
Focus bias adjustment method
• TGFL
The tracking gain can be switched by setting D5 with D6 = 1 and D7 = 0.
The tracking gain is GAIN UP with D5 = 1 and NORMAL GAIN with D5 = 0.
The TEO signal level can be made higher by approximately 6dB for GAIN UP.
When the TEO signal level is low and TGH (SENS1 pin) does not go Low during tracking adjustment, the
gain should be raised with the TGFL command for adjustment.
• LPC
The laser power control circuit can be turned ON and OFF by setting D0 with D6 = 1 and D7 = 1.
The circuit is ON with D0 = 1 and OFF with D0 = 0.
• LPCL
The laser power control limit can be switched between ±30% and ±50% by setting D1 with D6 = 1 and D7 = 1.
The control limit is ±30% with D1 = 0 and ±50% with D1 = 1.
• LDON
The laser diode can be turned ON and OFF by setting D2 with D6 = 1 and D7 = 1.
The laser diode is ON with D2 = 1 and OFF with D2 = 0.
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SONY [ SONY CORPORATION ]
