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)： 42/93頁(yè)
文件大?。?/td> 396K
代理商： SAF7846HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
42 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
The de-emphasis filter is controlled via FilterConfig bit DEEMPHCONTROL. The filter can
be enabled or disabled under software control, or automatically by hardware. In the latter
case, the filter is turned on when a ‘pre-emphasis’ bit is detected in the control byte of the
Q-channel subcode, and turned off when this bit is missing.
There are two detection modes possible:
According to the CD Red Book (IEC 60908) the ‘pre-emphasis’ bit is only checked
during the lead-in area (allowed to change), and during pauses between tracks
According to the CD Orange Book pre-emphasis is checked on every subcode frame
6.5.9.7
Upsample filter (four times)
This feature only affects the I
2
S, not the EBU output. When it is enabled, the audio data is
upsampled by a factor of four. The upsampling provides the frequency response
described in
Table 11
.
When upsampling is enabled, the audio data output rate on the I
2
S interface is four times
higher than without upsampling. Therefore, the I
2
S wclk frequency has to be four times
higher. This means the I
2
S bclk speed needs to be programmed to be four times higher
than normally required for the X-rate when upsampling would be disabled.
Fig 22. De-emphasis characteristics
001aag326
τ
= 50
μ
s
(3.18 kHz)
τ
= 15
μ
s
(10.6 kHz)
frequency
gain
(dB)
0
10
Table 11.
Passband
0 Hz to 9 kHz
9 kHz to 20 kHz
-
-
-
-
-
-
-
Upsample filter frequency response
Stop-band
-
-
24 kHz
24 kHz to 27 kHz
27 kHz to 35 kHz
35 kHz to 64 kHz
64 kHz to 68 kHz
68 kHz
69 kHz to 88 kHz
Attenuation
≤
0.001 dB
≤
0.03 dB
≥
25 dB
≥
38 dB
≥
40 dB
≥
50 dB
≥
31 dB
≥
35 dB
≥
40 dB
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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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