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參數(shù)資料
| 型號(hào)： | SAF7847HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號(hào)轉(zhuǎn)換 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 中文描述： | COLOR SIGNAL DECODER, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, SOT486-1, MS-026, PLASTIC, QFP-144 |
| 文件頁數(shù)： | 11/93頁 |
| 文件大?。?/td> | 396K |
| 代理商： | SAF7847HL |
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SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
11 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
6.1.2
HF acquisition
The HF data (EFM) signal is obtained by summing the signals from the three or four
central diodes of the OPU and filtering and converting the signals to a digital
representation via a 6-bit HF ADC.
Figure 4
shows a simplified block diagram of the HF
path.
The four diode signals D1, D2, D3 and D4 are summed in the first RF amplifier. The gain
of the first amplifier is controlled by register AGCGain[7:4].
A second gain stage has been added to lessen the gain bandwidth requirements of a
single gain stage operational amplifier and also to act as dynamic Automatic Gain Control
(AGC). The gain of this amplifier is set by register AGCGain[3:0] and can be changed
on-the-fly from the ARM microprocessor. The gain range accommodates 12 dB of gain
needed to boost the signal when the laser tracks across a fingerprint defect on the disc.
CD-R, CD-RW, and finger prints, not only reduce the AC signal amplitude compared to a
perfectly pressed disc but also reduces the DC pedestal voltage. The high-pass filter will
remove all DC present at the input, but offsets will be added by the second and third gain
stages. A 5-bit plus-sign DAC controlled by register OffsetComp[5:0] adds a current to
compensate for this offset. The current reduces in linear dB steps and follows the AC gain.
Fig 4.
HF acquisition block diagram
001aag308
20 k
RF AMP1
0 dB ... 24 dB
register AGCGain[7:4]
register
RFControl2[1]
HIGH-PASS
FILTER
D1
20 k
D2
20 k
D3
20 k
20 k
20 k
20 k
80 k
80 k
register
RFControl2[2]
single-ended-to-
differential
4
×
converter
register
OffsetComp[5:0]
decoded to [31:0]
D4
HF_MON
RF AMP2
0 dB ... 12 dB
register AGCGain[3:0]
A
NOISE
FILTER
D
E
G
H
H
G
E
D
C
B
A
B
C
noise_filt_sel
register
RFControl2[3]
register
RFControl1[6:4]
register
RFControl1[3:0]
67.7376 MHz
from PLL
67.7376 MHz
sys_clk
register
RFControl2[4]
register
RFControl2[0]
register
RFControl2[1]
register
RFControl2[5]
rf_adc_out[5:0]
to channel decoder
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAF7847HL/M201,557 | 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M245,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M295,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAF7860HL/M2,557 | 制造商:NXP Semiconductors 功能描述:DSP |
| SAF82520PVB2 | 制造商:SIEMENS 功能描述:New |
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