LA9242M データシートの表示（PDF） - SANYO -> Panasonic

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LA9242M

Analog Signal Processor (ASP) for CD Players

SANYO -> Panasonic 

LA9242M

6. Sled servo

The response characteristics are set by SLEQ (pin 28). The amplifier positioned after SLEQ (pin 28) has a mute

function that is applied when the SLED OFF command is issued. The sled is moved by inputting current to SL–

(pin 30) and SL+ (pin 31) ; specifically, the pins are connected to the microprocessor output ports via resistors, and

the movement gain is set by the resistance value of that resistor. It is important to note that if there is a deviation in

the resistance values for SL– (pin 30) and SL+ (pin 31), an offset will arise in the SLD output.

7. Spindle servo

This configures the servo circuit, which maintains the linear velocity of the disc at a constant speed, along with the

DSP. This circuit accepts signals from the DSP through CV– (pin 39) and CV+ (pin 40) and sets the equalizer

characteristics through SP (pin 24), SP– (pin26), and SPD (pin 27), which are output to SPD (pin 27). The 12-cm

mode amplifier gain is set by the resistor connected between SPG (pin 25) and the reference voltage. In 8-cm

mode, this amplifier serves as an internal buffer, and SPG (pin 25) is ignored. Note that the gain setting is made for

8-cm mode first, and then 12-cm mode. If SPG (pin 25) is left open, the gain is forcibly set for 8-cm mode, regard-

less of whether 8-cm or 12-cm mode is in effect.

8. TES and HFL (traverse signals)

When moving the pickup from the outer track to the inner track, the EF output from the pickup must be connected

so that the phase relationship of TES and HFL is as shown in the diagram below. For the TESI input, the TES

comparator has negative polarity and hysteresis of approximately ±100mV. An external bandpass filter is needed in

order to extract only the required signal from the TE signal.

3.0V

RFSM

2.1V

1.5V

HFL

TES

TE

9. DRF (luminous energy determination)

DRF goes high when the peak of the EFM signal (RFSM output) held by the PH1 (pin 60) capacitor exceeds

approximately 2.3V. The PH1 (pin 60) capacitor affects the DRF detection time constant and the RFAGC response

bidirectional setting. The DRF output is driven by a constant current (250µA).

DRF

RFSM

3.0V

2.3V

1.5V

FE

Pickup position

Focus

10. 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.

REF+0.2V

Focus

No.7097–8/20

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