CXD3003R datasheet(99/137 Pages) SONY

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CXD3003R

§5-6. AGCNTL (Automatic Gain Control) Function

The AGCNTL function automatically adjusts the filter internal gain in order to obtain the appropriate gain with

the servo loop. AGCNTL not only copes with the sensitivity variation of the actuator and photo diode, etc., but

also obtains the optimal gain for each disc.

The AGCNTL command is sent when each servo is turned on. During AGCNTL operation, if the upper 8 bits of

the command register are 38 (Hex), the completion of AGCNTL operation can be confirmed through the SENS

pin. (See Timing Chart 5-4 and "Description of SENS Signals".)

Setting D9 and D8 of $38 to 1 set FCS (focus) and TRK (tracking) respectively to AGCNTL operation.

Note) During AGCNTL operation, each servo filter gain must be normal, and the anti-shock circuit (described

hereafter) must be disabled.

XLAT

SENS

(= AGOK)

Max. 11.4µs

AGCNTL completion

Timing Chart 5-4.

Coefficient K13 changes for AGF (focus AGCNTL) and coefficients K23 and K07 change for AGT (tracking

AGCNTL) due to AGCNTL.

These coefficients change from 01 to 7F (Hex), and they must also be set within this range when written

externally.

After AGCNTL operation has completed, these coefficient values can be confirmed by reading them out from

the SENS pin with the serial readout function (described hereafter).

AGCNTL related settings

The following settings can be changed with $35, $36 and $37.

FG6 to FG0; AGF convergence gain setting, effective setting range: 00 to 57 (Hex)

TG6 to TG0; AGT convergence gain setting, effective setting range: 00 to 57 (Hex)

AGS;

Self-stop on/off

AGJ;

Convergence completion judgment time

AGGF;

Internally generated sine wave amplitude (AGF)

AGGT;

Internally generated sine wave amplitude (AGT)

AGV1;

AGCNTL sensitivity 1 (during rough adjustment)

AGV2;

AGCNTL sensitivity 2 (during fine adjustment)

AGHS;

Rough adjustment on/off

AGHT;

Fine adjustment time

Note) Converging servo loop gain values can be changed with the FG6 to 0 and TG6 to 0 setting values. In

addition, these setting values must be within the effective setting range. The default settings aim for 0

dB at 1kHz. However, since convergence values vary according to the characteristics of each

constituent element of the servo loop, FG and TG values should be set as necessary.

CXD3003R Datasheet(PDF) 99 Page - Sony Corporation

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