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參數(shù)資料
| 型號： | SAA7708H |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Car Radio Digital Signal Processor |
| 中文描述： | 汽車無線電數(shù)字信號處理器 |
| 文件頁數(shù)： | 22/60頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAA7708H |
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1998 May 19
22
Philips Semiconductors
Preliminary specification
Car Radio Digital Signal Processor
SAA7708H
10.7.12 IAC
TESTING
The internal IAC trigger signal is visible on DSP-OUT2 pin if the IAC_trigger bit of the IAC control register is set. In this
mode the effect of the parameter settings on the IAC performance can be verified.
10.8
Analog outputs
10.8.1
D/A
CONVERTERS
Each of the two low noise high dynamic range D/A convertors consists of a 15 bit signed magnitude DAC with current
output. This DAC current is split in two parts by means of a fader. Each part of the current is fed to an operational
amplifier, which converts the current into an output voltage. The fader makes it possible to make 4 outputs with only two
DACS.
10.8.2
U
PSAMPLE FILTER
To reduce spectral components above the audio band, a fixed 4 times oversampling and interpolating 18 bits digital IIR
filter is used. It is realised as a bit serial design and consists of two consecutive filters. The data path in these filters is 22
bits to prevent overflow and to maintain a theoretical SNR above 105 dB.
The word clock for the upsample filter (4*asf) is derived from the audio source timing. If the internal audio source is
selected, the sample frequency can be either 44.1 kHz or 38 kHz. In case of external digital sources (CD1, SPDIF), a
sample frequency from 32 kHz to 48 kHz is possible.
10.8.3
V
OLUME CONTROL
The total volume control has a dynamic range of more than 100 dB. With the signed magnitude noise shaped 15 bit DAC
and the internal 18 bits registers of the DSP core a useful digital volume control range of 100 dB is possible by calculating
Fig. 7 Typical THD+N curve versus output level
-80.0
-70.0
-60.0
-50.0
-40.0
-30.0
-20.0
-10.0
0.0
-80.0
-70.0
-60.0
-50.0
-40.0
-30.0
-20.0
Output Level (dB)
THD+N (dB)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7709/N107 | 制造商:PHILIPS-SEMI 功能描述: |
| SAA7709H/N103 | 功能描述:音頻 DSP DIGITAL SIGNAL PROCESSOR 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 |
| SAA7709H/N103,518 | 功能描述:音頻 DSP DIRAC-2 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 |
| SAA7709H/N103,557 | 功能描述:音頻 DSP DIGITAL SIGNAL 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 |
| SAA7709H/N103/S420 | 功能描述:音頻 DSP Car radio Digital Signal Processor 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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