參數(shù)資料
型號(hào)： HA12220F
廠商： Hitachi,Ltd.
英文描述： CD-ROM Drive Head Amplifier IC
中文描述： CD - ROM驅(qū)動(dòng)頭功放IC
文件頁(yè)數(shù)： 11/20頁(yè)
文件大小： 143K
代理商： HA12220F
HA12220F
Rev.1, Apr. 1997, page 11 of 20
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.
FOK
+
BUF
FOK
FSA
120k
120k
120k
120k
RF1
RF2
RF3
RF4
600k
5p
–
+
–
2
1
28
3
17
CO
CI10
11
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.
–
+
6
MD
LD
7
1k
APC
Figure 7 APC
相關(guān)PDF資料
PDF描述
HA12226 Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
HA12227F Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
HA12226F Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
HA12228F Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.)
HA12229F Audio Signal Processor for Car Deck(Decode only Dolby B-type NR with PB Amp.)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA12221F 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Audio Signal Processor for Car Deck (Decode only Dolby B type NR with PB Amp.)
HA12222F 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.)
HA12223F 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Audio Signal Processor for Car Deck (Decode only Dolby B type NR with PB Amp.)
HA12226 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
HA12226F 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
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