HA12220F
CD-ROM Drive Head Amplifier IC
ADE-207-230 (Z)
Target Specification
1st. Edition
April 1997
Functions
RF amplifier (Built-in equalizer changing circuit)
Focus error amplifier (fc = 60kHz Typ)
Tracking error amplifier (Built-in cut-off frequency changing circuit fc = 30kHz, 60kHz, 100kHz,
200kHz Typ)
FOK detection circuit (Built-in Vth changing circuit)
Mirror detection circuit
Defect detection circuit
APC amplifier
RFAGC amplifier
Features
Built-in variable resistors (+14 to 16% 2% steps) for adjusting tracking error EF balance
Built-in variable resistors (8 to +8dB 4dB steps) for rough adjusting tracking gain
Built-in variable resistors (8 to +8dB 4dB steps) for rough adjusting focus gain
Built-in focus offset insertion circuit (0.7 to +0.7V in 0.1V steps)
RF amplifier frequency characteristics 30MHz (3dB) in case of peaking off
High-speed access support (The mirror circuit internal time constant can be switched between normal,
4
and 8
modes.)
Support for CD-RW playback
Few external components
Available to set the stand-by mode
FP-28TB package
HA12220F
Rev.1, Apr. 1997, page 2 of 20
Block Diagram
28
1
RF2
0.1
RF1
27
V
CC
26
BYPS
VCB
2
RF3
3
RF4
4
TR1
0.1
AGCF
10
25
VCF
RFC
RFS
FOK
FSA
+
1
24
+
+
GND
23
0.015
DFH
DFT
21
HD49250
AGCO
22
HD49250
20
FOK
HD49250
MIRR
HD49250
18
MIRH
0.033
XLT
HD49250
DATA
HD49250
+
+
+
FE
+
FA2
+
+
FA
+
TE
+
Gain=12dB Typ
Gain=8dB Typ
FVR2
+
TA
+
TVR2
TVR
FVR
Offset
EQ
BIAS
AGC
DEFECT
MIRR
TR1
+
TVR
BAL
5
TR2
6
MD
LD
TR2
APC
+
7
TE
100
8
HD49250
FE
9
CI
HD49250
-COM
DAC
-COM
ADC
VC
BUF
CO
11
-COM
XRST
HD49250
CLK
GND
GND
GND
IIL
Interface
+
12
13
14
10
15
16
17
19
+
TLPF
Gain changing
HA12220F
Rev.1, Apr. 1997, page 3 of 20
Pin Description and Equivalent Circuit
Pin No.
Pin Name
Equivalent Circuit
Function
1
RF2
28
4k
5p
600k
160k
12k
120k
160k
12k
120k
160k
12k
120k
160k
12k
120k
160k
160k
10p
10p
1
2
3
RF FE FSA amplifier input2
2
RF3
RF FE FSA amplifier input3
3
RF4
RF FE FSA amplifier input4
28
RF1
RF FE FSA amplifier input1
4
TR1
4k
1.2p
32k
80k
40k
11.4k
TR1 amplifier input
5
TR2
4k
1.2p
32k
80k
40k
11.4k
TR2 amplifier input
6
MD
4k
APC amplifier input
7
LD
1k
150k
APC amplifier output
8
TE
40k
Tracking error signal output
9
FE
Focus error signal output
HA12220F
Rev.1, Apr. 1997, page 4 of 20
Pin Description and Equivalent Circuit (cont)
Pin No.
Pin Name
Equivalent Circuit
Function
10
CI
2.5k
FSA amplifier output monitor
11
CO
10k
Setting FOK reference voltage
12
VC
20k
Reference voltage output
13
XRST
4k
Reset input
14
CLK
Serial data synchronous clock
input
15
DATA
Serial data input
16
XLT
Serial data latch input
17
FOK
20k
V
CC
FOK detection signal output
18
MIRR
10k
V
CC
Mirror detection signal output
19
MIRH
100k
Mirror envelope hold signal
output
20
DFT
20k
V
CC
Defect detection signal output
HA12220F
Rev.1, Apr. 1997, page 5 of 20
Pin Description and Equivalent Circuit (cont)
Pin No.
Pin Name
Equivalent Circuit
Function
21
DFH
Defect envelope hold signal
output
22
AGCO
5k
5k
AGC amplifier output
23
AGCF
100k
4k
Capacitor connection for AGC
24
RFC
2k
4k
Capacitor connection for AGC
25
VCF
4k
40k
V
CC
40k
GND
Capacitor connection for
reference voltage ripple filter
26
BYPS
20k
V
CC
Capacitor connection for ripple
filter
27
V
CC
--
V
CC
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