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參數(shù)資料
| 型號(hào)： | LA9705W |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | SQFP-64 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大小： | 177K |
| 代理商： | LA9705W |
(8) DPD Circuit
The signal input to pin 3 is phase compared to the signals input to pins 4, 5, 6, and 7 and the result is output from pin
40. The phase comparison signal is output as a current by the pin 37 constant current charge pump and converted to a
voltage by the external capacitor and resistor connected to pin 37. The voltage converted signal is passed through a
buffer amplifier, band limited by the band switching circuit, and then output from pin 40. The charge pump goes to
the off state when pin 30 is at the high level. The band switching circuit operates as a 30 kHz low-pass filter when pin
31 is high, and as a 200 kHz low-pass filter when pin 31 is low. When pin 30 is low, pin 37 is shunted to SREF.
(9) APC Circuit
A servo loop that holds the laser power fixed can be implemented by inputting the monitor signal to pin 16 and
connecting pin 15 to the laser driver. The threshold voltage is 180 mV when pin 20 is low and VCC – 1.5 V when pin
20 is high. The laser can be turned off by setting pin 21 low.
The LA9705W provides two APC systems; the other system consists of pin 18 (monitor input), pin 17 (driver
output), and pin 22 (laser on/off control). The threshold voltage for this APC system is 180 mV.
(10)Reference Circuit
A voltage created by resistor dividing VCC by 2 internally is output from pin 58. The pin 58 voltage is a dedicated
pickup reference voltage.
The pin 48 voltage is resistor divided by 2 internally and output from pin 51. The pin 51 voltage is a reference level
supplied to the DSP and other circuits.
Design Notes
Setting the RF signal input level
In the mode where pin 20 (GD) is low and pin 25 (GU) is also low, set the RF level input to RFP and RFN to be under
700 mVpp using a TCD-785 test disc. If a signal with a level higher than that is input, the waveform may be distorted and
the player may not be able to read discs.
No. 7771-7/15
LA9705W
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