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參數(shù)資料
| 型號： | HA12220F |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | CD-ROM Drive Head Amplifier IC |
| 中文描述： | CD - ROM驅(qū)動頭功放IC |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 143K |
| 代理商： | HA12220F |
HA12220F
Rev.1, Apr. 1997, page 12 of 20
Focus Error Amplifiers
The FE amplifier adds and subtracts the output from the PDIC.
FVR2 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.
FVR is a variable resistor that changes the focus error gain over the range –8 to +8dB in ±4dB steps. This
variable resistor is set by 3-bit data from the HD49250.
An offset of between –0.7 and 0.7V (in 0.1V steps) is inserted into the focus error signal. This is set by 4-
bit data from the HD49250. The FE output cut-off frequency (fc) is 60kHz Typ.
3
160k
160k
RF4
RF3
RF2
RF1
160k
160k
160k
160k
10p
10p
2
1
28
FE
–
+
FA2
160k
10p
–
+
FA
–
+
Gain=12dB Typ
FVR2
FVR
Offset
FE
9
Figure 8 Focus Error Amplifiers
Defect Detection Circuit
When a scratched disc is played, the EFM RF signal has the shape shown in figure 10 (a). The defect
detection circuit detects the drop-out area of this signal.
0.015
μ
DFH
DFT
21
HD49250
20
MIRR
HD49250
18
MIRH
0.033
μ
19
DEFECT
MIRR
from AGC
Figure 9 Mirror Detection, Defect Detection
(a) Pin 22
(b) Pin 20
Figure 10 Defect Detection Waveform
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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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