HA12220F Datasheet, PDF (9/20 Pages) Hitachi Semiconductor – CD-ROM Drive Head Amplifier IC

Table 2 Serial Data Control Command 2
HA12220F
Tracking error gain
Tracking error filter
Mirror
Defect
APC ON
FOK Vth
Stand-by
RFEQ
D7D6D5 D4
100 —
DATA
D3
D2
D1
Tracking error gain
D3 D2 D1
000
011
010
101
110
Gain (dB)
0
–4
–8
+7.9
+4.3
Note
D0
0
101
0
Mirror, Defect *1
D3 D2 Mode
Tracking error ^{0 0 Normal}
filter
01
4×
D4 D1 1 1
8×
1 1 30kHz
0 1 60kHz
1 0 100kHz
0 0 200kHz
110
FOK Vth
D4 D3 Vth
1 1 –12dB
0 1 –6dB
0 0 0dB
1 0 Prohibit
Stand-by
ON
APC ON
0 Stand-by
mode is
cleared by
setting
XRST on.
1 1 1 SC4
SC3
SC2
SC1 0
*2
Note: 1. Switches the mirror circuit and the defect circuit internal time constants at the same time.
Don’t use D3 = “1”, D2 = “0” mode.
2. The switch name surrouded by circle means that the switch turns on when the
corresponding bit is “1”. This switch changes the value of the RF peaking capacitor.
In case of peaking off all switches must be set off.
Rev.1, Apr. 1997, page 9 of 20