HA12220 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12220

CD-ROM Drive Head Amplifier IC

Hitachi -> Renesas Electronics 

HA12220F

Operation

Control by Serial Data

The IC’s internal switches can be operated by sending control data from the HD49250.

The signal timing is shown in figure 1, and the control commands are listed in table 1 and 2.

Pin 15 DATA

Pin 14 CLK

Pin 16 XLT

0123456 7

T1

T2

T3

T4

Item

Symbol Min Typ

Clock frequency fCLK

—

—

Clock pulse width T1, T2 0.96 —

Delay time

T3

1

—

Latch pulse width T4

2

—

Max Unit

520 kHz

— µs

—

µs

— µs

Figure 1 Timing Diagram for Serial Data Control

Signals from the HD49250 are input at pins 14 to 16. Pin13 is connected to the microcomputer.

A low input at the XRST pin resets the IC. Normally this pin should be kept high.

The serial data from the HD49250 switches the following settings.

1. Tracking error EF balance

2. Focus offset

3. Tracking gain, Focus gain

4. FOK Vth

5. Mirror circuit, defect circuit normal speed / 4× speed / 8× speed mode

6. Tracking error cut-off frequency

7. APC amplifier ON/OFF

8. RF equalizer

9. Stand-by mode (cleared by setting XRST on)

Rev.1, Apr. 1997, page 6 of 20

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