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參數(shù)資料
| 型號： | LA9705W |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | SQFP-64 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 177K |
| 代理商： | LA9705W |
Operational Description
(1) Customer Operational Amplifier
The LA9705W provides a high-band operational amplifier for customer use. Pin 1 is the noninverting (+) input, pin
64 is the inverting (–) input, and pin 62 is the output.
If this circuit is not used, short pins 62 and 64 together and connect pin 1 to pin 58.
(2) RF Amplifier
The RF signal differentially input to pins 59 and 61 passes through the AGC VCA and the equalizer and is output as a
differential signal from pins 54 and 55. The IC detects the peak level and the DC level from the differential signal
output from pins 54 and 55. The AGC VCA is controlled based on the detected peak signal, thus forming the AGC
loop. The time constant for peak level detection is determined by the capacitor connected to pin 50. The AGC circuit
can be set to a fixed gain by setting pin 23 high. The DC servo is formed by adding the detected DC value to the
AGC VCA front end. The DC servo band can be set with the value of the capacitor connected to pin 52.
Setting pin 25 high increases the pin 59 and 61 input stage amplifier gain by a factor of 5. Also, setting pin 20 high
reduces the pin 59 and 61 input stage amplifier gain by a factor of 1/4.6.
(3) RF Equalizer
The equalizer is switched to the DVD band by setting pin 26 high, and to the CD band by setting that pin low. The
equalizer band is set by the value of the resistor connected between pin 57 and ground. Also, the equalizer f0
frequency can be modified with the DC voltage on pin 34. The amount of boost provided by the equalizer depends on
the pin 33 DC voltage.
(4) Peak Hold and Bottom Hold Circuits
Pins 47 and 46 output the peak and bottom envelope waveform detected from the differential signal output from pins
55 and 54. When pin 24 is high, the peak envelope detection constant is set by the value of the resistor connected
between pin 49 and ground. The bottom hold band can be roughly doubled by setting pin 31 low.
(5) Reflection amplifier
The current signal input to pins 9 and 10 is I/V converted and added by a summation amplifier. The pit component of
the input signal is removed by a low-pass filter. The summed signal passes through the VCA circuit, which adjusts
the servo gain, and is output from pin 38. The VCA that adjusts the servo gain is controlled by the DC voltage
applied to pin 32.
Note that when pin 25 is at the high level, the gain is increased by a factor of 5.
(6) FE Amplifier
The current signal input to pins 9 and 10 is I/V converted and after being passed through a balance adjustment VCA,
the difference is taken. Then, after passing through a servo gain adjustment VCA, the signal is output from pin 39.
The gain of the balance adjustment VCA is adjusted by the DC voltage input to pin 35. The servo gain adjustment
VCA is controlled by the DC voltage applied to pin 32.
Note that when pin 25 is at the high level, the gain is increased by a factor of 5.
(7) TE Amplifier (for 3-beam systems)
The current signal input to pins 13 and 14 is I/V converted and a balance adjustment VCA, the difference is taken.
The signal passes through a servo gain adjustment, and, after band switching, is output from pin 40. The gain of the
balance adjustment VCA is adjusted by the DC voltage input to pin 36. The servo gain adjustment VCA is controlled
by the DC voltage applied to pin 32. 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, the output is shunted to SREF.
Note that when pin 25 is at the high level, the gain is increased by a factor of 5.
No. 7771-6/15
LA9705W
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