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PDF HA12220F Data sheet ( Hoja de datos )
| Número de pieza | HA12220F | |
| Descripción | CD-ROM Drive Head Amplifier IC | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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
1 page  
Pin Description and Equivalent Circuit (cont)
Pin No. Pin Name Equivalent Circuit
21 DFH
22 AGCO
23 AGCF
24 RFC
25 VCF
26 BYPS
27 V
CC
—
5k 5k
100k
4k
2k 4k
VCC
40k 4k
40k
GND
VCC
20k
HA12220F
Function
Defect envelope hold signal
output
AGC amplifier output
Capacitor connection for AGC
Capacitor connection for AGC
Capacitor connection for
reference voltage ripple filter
Capacitor connection for ripple
filter
V
CC
Rev.1, Apr. 1997, page 5 of 20
5 Page 
HA12220F
FOK Detection Circuit
This detector is a comparator that generates the FOK signal. FOK is one of the signals that activate the
focus servo.
The FSA amplifier (fc = 53kHz Typ) summes the output from the PDIC. When this output signal becomes
lower than the reference voltage by Vth, pin 17 goes high. This Vth can be set by 2-bit data from the
HD49250.
Vth is set to 0.8V (0dB) after a reset.
Using µ-com ADC & DAC the voltage of pin 11 had better be set the same voltage as the voltage of pin 10
before focus searching in order to reduce the effect of DC offset voltage at FSA amplifier output.
28 RF1
1 RF2
2 RF3
3 RF4
120k
120k
120k
120k
5p
600k
–
+
FSA
BUF
–
+ 11
CO
FOK
+
–
FOK 17
CI 10
µ-COM DAC
µ-COM ADC
Figure 6 FOK Detection
APC
This circuit is for the Psub laser diode. This circuit is turned on or off by 1-bit data from the HD49250.
MD
6
APC
1k
LD
7
Figure 7 APC
Rev.1, Apr. 1997, page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet HA12220F.PDF ] | |
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