參數(shù)資料
型號(hào)： SAF7843HL
廠商： NXP Semiconductors N.V.
元件分類： 存儲(chǔ)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(yè)數(shù)： 61/93頁(yè)
文件大?。?/td> 396K
代理商： SAF7843HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
61 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
Sigma-delta noise shaper
: this block regenerates a PDM data stream from a given
multi-bit value, which is provided at its inputs.
6.7.1
Modes of operation
The flexible servo can be used in six main modes, they are described in the following
sections.
6.7.1.1
Hardware servo-only
This mode uses the hardware servo (PDSIC) only without any additional processing
taking place on either the diode input signals or the servo output signals.
6.7.1.2
Hardware servo with fine offset compensation
This mode is the same as hardware servo-only mode but has the addition of the fine offset
compensation functionality in the digital domain. The fine offset compensation is
additional to the coarse offset compensation, which is available in all flexible servo modes.
6.7.1.3
Fully flexible servo
Also known as software servo. The diode signals have the fine offset applied to them and
are passed to registers for reading by the ARM microprocessor. The complete servo
functionality is implemented in software running on the ARM; the PDSIC hardware servo
is switched out of the loop entirely. The ARM calculates values, which are used to
generate servo signals for driving the mechanism actuators. The PDM generation for the
servo output signals is performed by the sigma-delta block.
6.7.1.4
Pre-processing with hardware servo
The diode signals have the fine offset applied to them and are passed to registers for
reading by the ARM microprocessor. The ARM pre-processes these signals and they are
fed back to the inputs of the hardware servo via sigma-delta noise shapers. The hardware
servo (PDSIC) performs all the control functions (on the modified input signals) and
outputs the servo signals as hardware servo-only mode.
6.7.1.5
Hardware servo with post-processing
The diode signals are passed directly to the hardware servo inputs (can be with, or
without, fine-offset compensation added). The PDSIC servo output signals are passed to
registers for reading by the ARM microprocessor. The ARM executes any post-processing
it deems necessary on the signals and passes new values back which are used to drive
the mechanism actuators. The servo outputs are therefore generated by the ARM, rather
than the PDSIC, but based on the signals provided by the PDSIC.
6.7.1.6
Pre-processing with hardware servo plus post-processing
The diode signals have the fine offset applied to them and are passed to registers for
reading by the ARM microprocessor. The ARM pre-processes these signals and they are
fed back to the inputs of the hardware servo via sigma-delta noise shapers. The hardware
servo performs all the control, and the servo output signals are passed to registers for
reading by the ARM microprocessor. The ARM executes any post-processing it deems
necessary on the signals and passes new values back which are used to drive the
mechanism.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)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(fēng)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(fēng)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(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
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