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參數(shù)資料
| 型號： | LA9239T |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO36 |
| 封裝： | TSSOP-36 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 76K |
| 代理商： | LA9239T |
No. 7131-4/9
LA9239T
(6) BH (RF bottom hold signal)
The HFL (mirror) detection signal is generated at BH (pin 35), and HFL (mirror) is detected in the DSP. The DSP
detects the track jump direction using the phase difference with TES. Moreover, this BH circuit has a band switching
function that can be controlled with BHH (pin 17). (BHH = Hi for wide band)
(7) PH (RF peak hold signal)
The RF peak hold signal used for defect detection is output from PH. The DSP performs defect detection judgments
based on this signal. Since the EFM signal level is not necessarily stable due to the influence of the disk's reflection
factor, consideration must be paid to using as reference the PH signal level measured when there are no scratches, for
defect judgment. Moreover, the PH circuit performs constant settings during PH demodulation according to the speed.
This is controlled along with the RF equalizer by the EQS (pin 18) control pin.
The system is designed so that, during focus balance adjustment, the peak and bottom levels of the 3T component are
detected and output as the error signal. During focus balance adjustment, 3T is extracted and output from PH and BH
by setting 3TON (pin 6) to Hi.
(8) Sleep
The sleep status can be selected in order to reduce the current drain of the IC.
(Sleep is selected with EQS (pin 18) = GND.)
Usage Note
The level of the signals input to FIN1 (pin 7), FIN2 (pin 8), E (pin 9), and F (pin 10) must be set so that it is higher than
the reference voltage (VREF).
Relationships between control pin voltages and operation modes
1. 3TON (pin 6)
Extracts 3T and performs focus balance adjustment.
Mode
Min
Max
Extraction Frequency
3TON
3.0 V
5.0 V
10 MHz
3TOFF
0 V
2.0 V
—
2. LDON (pin 15)
Laser ON and laser power-up (20%) switch control
Mode
Min
Max
Laser
Power Up
PUPH
3.5 V
5.0 V
ON
Hi
LDOF
2.0 V
3.0 V
OFF
Low
LDON+PUPL
0 V
1.5 V
ON
Low
3. GHS (pin 16)
RF and TS gain-up (+14 dB) switch control
Mode
Min
Max
Gain Up
RW support
3.0 V
5.0 V
Hi
CD support
0 V
2.0 V
Low
4. BHH (pin 17)
Reduces the time constant during bottom hold when the access speed is slow.
Mode
Min
Max
Band (fc)
Hi (during normal operation)
3.0 V
5.0 V
450 kHz
Low (when access speed is slow)
0 V
2.0 V
80 kHz
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