M62475FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M62475FP

AUTOMATIC ADJUSTMENT CD PREAMPLIFIER SERVO CONTROLLER

MITSUBISHI ELECTRIC  

MITSUBISHI SOUND PROCESSOR ICs

M62475FP

AUTOMATIC ADJUSTMENT CD PREAMPLIFIER SERVO CONTROLLER

AUTOMATIC ADJUSTMENT FUNCTION

The IC is capable of automatically adjusting the three places of

tracking balance, tracking gain and focus gain.

TRACKING BALANCE ADJUSTMENT

The input resistance of the I/V conversion amplifier connected to E

and F pickups and the 8-step adjustment resistance built in a

feedback resistance are switched for the adjustment. The

adjustment precision is approximately 3% by the step.

The automatic adjustment operation enters an oscillation signal

from the automatic adjustment signal generator of MCU into a

servo loop to forcibly make the beam cross the track. When this is

the case, the output voltage of I/V conversion amplifier is

integrated. If the E and F output signals are well balanced and are

the same, an error voltage is not generated in the output voltage

after this integration and a reference voltage is obtained. If they

are not balanced, a voltage of a DC component is generated. The

result of having compared this output voltage and the reference

voltage is converted into a logical level and is then output to the

monitor terminal. The MCU is used for control and the result is

judged. According to the result, the adjustment resistance of the

I/V conversion amplifier is sequentially switched step by step for

the adjustment in the direction of reversing the current logical

result. At the time when the result has been reversed, the error is

judged to be put within a one-step error and the adjustment is

complete.

TRACKING FOCUS GAIN ADJUSTMENT

The input resistance of the tracking focus error amplifier and the 8-

step adjustment resistance built in a feedback resistance are

switched for the adjustment. The adjustment precision is

approximately 1 dB by the step.

The adjustment operation enters an oscillation signal with the

output gain of -3 dB in a servo loop from the automatic adjustment

signal generator of MCU into a servo loop to forcibly generate a

gap in the track and focus. A waveform adjusted signal of the

generated tracking focus error signal and the MCU oscillation

signal are collated with each other with respect to the phase and is

then integrated to convert the phase difference into the voltage.

The result of having compared this output voltage and the

reference voltage is converted into a logical level and is then

output to the monitor terminal. The MCU is used for control and

the result is judged. According to the result, the input resistance of

the amplifier is sequentially switched step by step in feedback

resistance for the adjustment in the direction of reversing the

current logical result. At the time when the result has been

reversed, the error is judged to be put within a one-step error and

the adjustment is complete.

EQUIVALENT CIRCUIT (Tracking Balance)

TRACKING

ACTUATOR

PD

ADJUSTMENT

RESISTANCE

EF

I/V CONVERSION

AMPLIFIER

ADJUSTMENT

RESISTANCE

VOLTAGE

COMPARATOR

MONITOR

TERMINAL

(to MCU)

BIAS

VOLTAGE

BIAS

VOLTAGE

EQUIVALENT CIRCUIT (Tracking Focus Gain)

GAIN ADJUSTMENT

ERROR AMPLIFIER

EX-OR

TRACKING ACTUATOR

OR FOCUS ACTUATOR

VOLTAGE

COMPARISON

ACTUATOR

To DATA-OUT

MCU

MCU

BIAS

COMMAND VOLTAGE

LATCH SIGNAL

MITSUBISHI

ELECTRIC

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