參數(shù)資料
型號(hào)： SAF7846HL
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)： 41/93頁(yè)
文件大小： 396K
代理商： SAF7846HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
41 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
6.5.9.3
Soft mute and error detection
The audio data going to the I
2
S and/or EBU interface can be processed by a soft mute
block. This block can ramp the audio volume down from 0 dB to
90 dB, making use of 64
stages of about
1.5 dB each. The current stage can be monitored and changed by
software read or write register MuteVolume. This allows the implementation of a software
mute scheme. If the hardware mute logic is triggered by the error detection block
(explained in the next paragraph), it ramps the volume down from maximum until fully
muted in 3 / N ms, where N is the X-rate of the disc. The mute logic can be enabled
separately for the I
2
S and EBU outputs, by setting the corresponding bits in register
MuteConfig.
The back end also contains an error detection block, that scans the data for a
programmable number (via register MuteOnDefectDelay) of consecutive corrupted stereo
samples. If such a pattern is found, and MuteConfig bit MUTEERREN is turned on, the
soft mute will be triggered to start its volume ramp down. This detection will also trigger an
InterruptStatus1 bit AUDIOERRORDETECTED interrupt.
6.5.9.4
Hard mute on EBU
The EBU can be hard muted (EBU main data and flags set to 0, status and user channel
still valid) by setting EBUConfig bit EBUHARDMUTE.
6.5.9.5
Silence detection and kill generation
The silence detector looks for 250 ms of digital silence (2’s complement data = all ‘1s’ or
all ‘0s’) on either one or both channels and can trigger the kill logic when it is found. This
feature is enabled via KillConfig bit KILLSILENCEEN.
The kill logic generates left and right kill signal outputs from the channel decoder that can
be used to gate the left and right channels of an audio DAC. The kill signals can be
triggered on both channels together by the detection of stereo silence, or on each channel
separately by the detection of mono silence. The operation that is active depends on the
setting of register KillConfig. It is also possible to set the left and right kill signals by
software writing directly to bits KILLLEFT and KILLRIGHT in this register.
Another condition that sets both left and right kill signals is the soft mute block reaching
‘fully muted’ (volume-stage 0).
6.5.9.6
De-emphasis filter
This feature only affects the I
2
S, not the EBU output. The de-emphasis filter can be used
to remove pre-emphasis from tracks which have been recorded using the standard
emphasis as described in the CD Red Book (IEC 60908) The de-emphasis filter has the
inverse response of the emphasis characteristics as described in the standard.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
SAF7860HL/M2,557 制造商:NXP Semiconductors 功能描述:DSP
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