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參數(shù)資料
| 型號： | LA9220M |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 247K |
| 代理商： | LA9220M |
LA9220M
No.5188–9/20
Focus determination
Focus is assumed to be obtained when the focus error signal “S” curve reaching REF +0.2V is detected, and the “S”
curve subsequently returns to REF.
DEFECT
The mirrored surface level is maintained by the capacitor for LF2 (pin 59) ; when a drop in the EFM signal (RFSM
output) reaches 0.35V or more, a high signal is output to DEF (pin 49). If DEF (pin 49) goes high, the tracking servo
enters THLD mode. In order to prevent the tracking servo from entering THLD mode when a defect is detected,
prevent DEFECT from being output by either shorting DEF (pin 49) to GND, or shorting LF2 (pin 59) to GND. The
DEFECT output is driven by constant current (approximately 100
A).
VCC /REF/GND
VCC1 (pin 64)
: RF system
VCC2 (pin 56)
: SERVO system, DIGITAL system
AGND (pin 22)
: RF system, SERVO system
DGND (pin 45)
: DIGITAL system
PLL circuit
VCOC is the loop filter setting amplifier for the EFM signal PLL, and equalizes the PLL phase comparison output
from the DSP, and outputs it to the internal VCO.
VCO is the VCO circuit for the EFM signal PLL, and requires the reference clock from the DSP (4.23MHz only ;
does not support 2.1609MHz for the LC7860KA, etc.). The VCO free-running frequency can be varied according to
the current input to LF (pin 55). The VCO output can be turned on or off by using the VCO-OLT ON/OFF command.
Reset circuit
The power-on reset is released when VCC exceeds approximately 2.8V.
Microprocessor interface
Because the Reset (Nothing) command initializes the LA9220M, it must be used carefully.
The LA9220M command acceptance (mode switching) timing is defined by the internal clock (4.23MHz divided to
130kHz) after the falling edge of CE (RWC) ; therefore, when commands are sent consecutively, CE must go low for
at least 10
s. For this reason, the 4.23MHz clock is required even when VCO of LA9220M is not used. 2BYTE-
COMMAND RESET is used only for the purpose of masking two-byte data.
All instructions can be input by setting CE high and sending commands synchronized with the CL clock from the
microprocessor to DAT (pin 52) in LSB first format. Note that the command is executed at the falling edge of CE.
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