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| 型號： | SAF7849HL |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 存儲器 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 封裝： | SAF7843HL/M295<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.html<1<Always Pb-free,;SAF7849HL/M245<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.h |
| 文件頁數(shù)： | 9/93頁 |
| 文件大?。?/td> | 396K |
| 代理商： | SAF7849HL |
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SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
9 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
[1]
See
Table 3
for pin type definition.
6.
Functional description
6.1 Analog data acquisition
The input signals from the OPU photodiodes contain information used in the servo loops
and the high frequency data from which the audio samples are reconstructed. The
SAF784x contains all the necessary circuitry to process the photodiode signals directly
and hence removes the need for a separate external diode signal preamplifier.
6.1.1
LF acquisition
The LF signal path acquires the photodiode voltage signals and converts them into 4 MHz
pulse-density modulated digital data streams. These streams are processed within the
digital servo to control the focus, radial and sledge loops.
The servo processing makes use of the difference calculations D1
D2, D3
D4 and
R1
R2. Ideally these differences should be zero when the quantities D1 to R2 are equal
due to the laser illumination. However in a practical system, errors reduce the accuracy of
the signal processing. Two main forms of errors exist - DC offsets and relative gain
mismatch between the difference channels.
The DC offsets are minimized in the SAF784x by DC-offset compensation circuitry which
allows the DC present in the Pulse Density Modulation (PDM) streams to be measured
when the laser is switched off, and then subtracted from the signals in the digital domain
when the laser is on.
RA
FO
n.c.
142
143
144
O
O
-
radial actuator
focus actuator
not connected pad
Table 2.
All digital inputs and bidirectional pins are 5 V tolerant.
Symbol
Pin description
…continued
Pin
Type
[1]
Description
Table 3.
Type
AI
AO
AIO
AIB
ID
IDH
IU
IUH
O
B
P
Pin type definition
Definition
analog input
analog output
analog input/output
analog input or bidirectional
digital input with pull-down
digital input with pull-down and hysteresis
digital input with pull-up
digital input with pull-up and hysteresis
digital output, slew-rate limited
digital bidirectional, slew-rate limited
power connection
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SAF82525 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Data Communications ICs |
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