參數(shù)資料
型號(hào)： HA12220
廠(chǎng)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)： 13/20頁(yè)
文件大小： 143K
代理商： HA12220
HA12220F
Rev.1, Apr. 1997, page 13 of 20
Mirror Detection Circuit (MIRR)
As the pick-up travels across tracks, the EFM RF signal varies as in figure 11 (a). The mirror detection
circuit detects the mirror region from this signal.
The external capacitor on pin 19 integrates the track-crossing frequency component.
The internal time constant of the mirror detection circuit can be set for normal, 4
×
, or 8
×
speed by 2-bit
data from the HD49250, to raise the trackable range of track-crossing frequencies. The defect circuit
internal time constant is also switched at the same time.
(a) Pin 22
(b) Pin 18
Figure 11 Mirror Detection Waveform
Tracking Error Amplifiers
The sub-beam output of PDIC is passed through a resistor and input at pins 4 and 5. External resistances of
pins 4 and 5 should be set according to the pick-up so that the traverse signal at pin 8 is about 2Vpp Typ.
After a reset, the initial value of the feedback resistance BAL of TR1 amplifier is 400k
, the same as the
feedback resistance of TR2 amplifier.
BAL has a variable resistance value that is changed by 4-bit data from the HD49250. The variability range
here is from –16 to +14% in 2% steps. This resistance can be varied to adjust the EF balance of the
tracking error.
TE amplifier generates the tracking error signal.
TVR is a resistor that changes the tracking gain from –8 to +8dB in 4dB steps. This is set by 3-bit data
from the HD49250. TVR2 is a variable resistor used to increase the gain by 12dB in CD-RW mode. This
variable resistor is set by 1-bit data from the HD49250.
TLPF switches the tracking error cut-off frequency. The TE output cut-off frequency is set to either 30, 60,
100, or 200kHz (Typ) by 2-bit data from the HD49250.
4
TR1
–
+
TE
–
+
Gain=8dB Typ
TA
–
+
TVR2
TLPF
TVR
TR1
–
+
TVR
BAL
5
TR2
TR2
400k
1.2p
+
1.2p
–
TE
8
Figure 12 Tracking Error Amplifiers
相關(guān)PDF資料
PDF描述
HA12220F CD-ROM Drive Head Amplifier IC
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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)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA12220F 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:CD-ROM Drive Head Amplifier IC
HA12221F 制造商:RENESAS 制造商全稱(chēng):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(chēng):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(chēng):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(chēng):Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
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