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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)： | 10/20頁 |
| 文件大?。?/td> | 143K |
| 代理商： | HA12220F |
HA12220F
Rev.1, Apr. 1997, page 10 of 20
RF Amplifiers
The output from PDIC is summed by RFS amplifier.
Figure 4 shows the equivalent circuit for the EQ block in figure 3. The peaking characteristics can be
changed with 4-bit data from the HD49250.
On resistance of SC1 to SC4 are 600
Typ.
1
28
to AGC
2
RFS
–
+
3
EQ
12k
12k
12k
12k
RF1
RF2
RF3
RF4
Figure 3 RFS Amplifier
SC3
SC2
1.58k
4k
4k
SC1
SC4
4p
8p
0.3p
16p
Figure 4 RFS Amplifier Equalizer Equivalent Circuit
The RFS amplifier output is input to the AGC amplifier internally in the IC.
Pin 24 is used to connect the capacitor that sets cut-off frequency of high-pass filter between the RFS
amplifier and the AGC amplifier. The cut-off frequency will typically be 80Hz with the external constants
shown in figure 5.
The RF signal is rectified by an internal resistor and an external capacitor connected to pin 23.
The pins 28, 1, 2, and 3 expect an input level of about 0.1Vpp. The AGC amplifier output (pin 22) will
have an amplitude of 1.2Vpp Typ.
When CD-RW mode is set by 1-bit data from the HD49250, the AGC amplifier gain is increased by 12dB.
This allows the IC to output a 1.2Vpp Typ amplitude even during CD-RW playback.
0.1
μ
AGCF
RFC
1
μ
+
24
23
to HD49250
to DEFECT MIRR
AGCO
from RFS
22
AGC
Gain changing
Figure 5 AGC Amplifier
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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