參數資料
型號： SAF7843HL
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： 51/93頁
文件大小： 396K
代理商： SAF7843HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
51 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
The SAF784x contains additional circuits to implement a servo feature called Flexi servo.
The purpose of the flexible servo system is, in conjunction with the existing analog and
digital LF path, to provide maximum flexibility in the use of the entire servo loop. This
scheme extends from the point of diode PDM generation at the analog ADC outputs
through to the servo actuator signals (RA, FO and SL) themselves.
From a system perspective, the simplest configuration provides an LF path that is
equivalent to the hardware servo (PDSIC) of the other audio devices such as SAA7826,
which uses the on-board hardware servo controller logic. However, an alternative setup
will provide additional fine DC-offset compensation (in addition to the coarse
compensation already found in the analog ADCs) and the potential for full software servo
control via the ARM microprocessor. Full system configuration details are given in the
block diagrams in the sections below.
6.6.2
Diode signal processing
The photo detector in conventional two-stage three-beam compact disc systems normally
contains six discrete diodes. Four of these diodes (three for single foucault systems) carry
the Central Aperture signal (CA) while the other two diodes (satellite diodes) carry the
radial tracking information. The CA signals are summed into an HF signal for the decoder
function and are also differenced (after A-D conversion) to produce the low frequency
focus control signals.
The low frequency content of the six (five if single Foucault) photodiode inputs are
converted to pulse-density modulated bit streams by a multiplexed 6-bit ADC followed by a
digital PDM generation circuit. This supports a range of OPUs in Voltage mode
mechanisms by having sixteen selectable gain ranges in two sets, one set for D1 to D4
and the other for R1 and R2.
Fig 28. Function of servo IRQ signal with respect to srv_fc0, srv_fc1 and inreq_clr
001aag332
IRQ cycle time of ~60
μ
s
natural duration of
IRQ (~45
μ
s)
srv_fc0
srv_fc1
IRQ
inreq_clr
IRQ #2
cleared by
inreq_clr
pulse
IRQ #3
cleared by
inreq_clr
pulse
int #1
int #2
int #3
IRQ cycle time of ~60
μ
s
IRQ cycle time of ~60
μ
s
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相關代理商/技術參數
參數描述
SAF7843HL/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
SAF7846HL/M210,557 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: 安裝風格: 封裝 / 箱體: 封裝:Tube
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
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