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參數(shù)資料
| 型號： | ADAU1701 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | SigmaDSP 28/56-Bit Audio Processor with 2ADC/4DAC |
| 中文描述： | SigmaDSP的28/56-Bit音頻處理器2ADC/4DAC |
| 文件頁數(shù)： | 25/43頁 |
| 文件大?。?/td> | 625K |
| 代理商： | ADAU1701 |
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Preliminary Technical Data
ADAU1701
SIGNAL PROCESSING
OVERVIEW
The ADAU1701 is designed to provide all signal processing
functions commonly used in stereo or multichannel playback
systems. The signal processing flow is designed using the ADI-
supplied SigmaStudio software, which allows graphical entry
and real-time control of all signal processing functions.
Rev. PrF | Page 25 of 43
Many of the signal processing functions are coded using full,
56-bit double-precision arithmetic. The input and output word
lengths are 24 bits. Four extra headroom bits are used in the
processor to allow internal gains up to 24 dB without clipping.
Additional gains can be achieved by initially scaling down the
input signal in the signal flow.
The signal processing blocks can be arranged in a custom pro-
gram that can be loaded to the ADAU1701’s RAM. The
available signal processing blocks are explained in the following
sections.
NUMERIC FORMATS
It is common in DSP systems to use a standardized method of
specifying numeric formats. Fractional number systems are
specified by an A.B format, where A is the number of bits to the
left of the decimal point and B is the number of bits to the right
of the decimal point.
The ADAU1701 uses the same numeric format for both the
coefficient values (stored in the parameter RAM) and the signal
data values. The format is as follows:
Numerical Format: 5.23
Range: –16.0 to (+16.0 1 LSB)
Examples:
1000 0000 0000 0000 0000 0000 0000 = –16.0
1110 0000 0000 0000 0000 0000 0000 = –4.0
1111 1000 0000 0000 0000 0000 0000 = –1.0
1111 1110 0000 0000 0000 0000 0000 = –0.25
1111 1111 1111 1111 1111 1111 1111 = (1 LSB below 0.0)
0000 0000 0000 0000 0000 0000 0000 = 0.0
0000 0010 0000 0000 0000 0000 0000 = 0.25
0000 1000 0000 0000 0000 0000 0000 = 1.0
0010 0000 0000 0000 0000 0000 0000 = 4.0
0111 1111 1111 1111 1111 1111 1111 = (16.0 – 1 LSB).
The serial port accepts up to 24 bits on the input and is sign-
extended to the full 28 bits of the core. This allows internal
gains of up to 24 dB without encountering internal clipping.
A digital clipper circuit is used between the output of the DSP
core and the outputs (see Figure 30). This clips the top four bits
of the signal to produce a 24-bit output with a range of 1.0
(minus 1 LSB) to –1.0.
4-BIT SIGN EXTENSION
DATA IN
SERIAL PORT
1.23
5.23
SIGNAL PROCESSING
(5.23 FORMAT)
DIGITAL
CLIPPER
5.23
1.23
0
Figure 30. Numeric Precision and Clipping Structure
PROGRAMMING
On power-up, the ADAU1701’s default program passes the
unprocessed input signals to the outputs (Figure 15), but the
outputs are muted by default (see Power-Up Sequence section).
There are 1,024 instruction cycles per audio sample, resulting in
an internal clock rate of 49.152 MHz (for f
s
= 48 kHz). This DSP
runs in a stream-oriented manner, meaning all 1,024
instructions are executed each sample period. The ADAU1701
may also be set up to accept double or quad-speed inputs by
reducing the number of instructions/sample, which can be set
in the core control register.
The part can be programmed easily using SigmaStudio, a
graphical tool provided by Analog Devices. No knowledge of
writing line-level DSP code is required.
相關PDF資料 |
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| ADAU1701JSTZ | SigmaDSP 28/56-Bit Audio Processor with 2ADC/4DAC |
| ADAU1701JSTZ-RL | SigmaDSP 28/56-Bit Audio Processor with 2ADC/4DAC |
| ADAV400 | Audio Codec with Embedded SigmaDSP Processor |
| ADAV400KSTZ | Audio Codec with Embedded SigmaDSP Processor |
| ADAV400KSTZ-REEL | Audio Codec with Embedded SigmaDSP Processor |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADAU1701JSTZ | 功能描述:IC AUDIO PROC 2ADC/4DAC 48-LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SigmaDSP® 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| ADAU1701JSTZ-RL | 功能描述:IC AUDIO PROC 2ADC/4DAC 48-LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SigmaDSP® 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| ADAU1701MINIBZ | 制造商:Analog Devices 功能描述:EVAL BD SIGMADSPMULTICHANAUDIO PROCESSOR - Bulk |
| ADAU1702 | 制造商:AD 制造商全稱:Analog Devices 功能描述:SigmaDSP 28-56-Bit Audio Processor with Two ADCs and Four DACs |
| ADAU1702JSTZ | 功能描述:IC AUDIO PROC 2ADC/4DAC 48-LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SigmaDSP® 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
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