| ADI ADAV400音频CODEC应用方案 |
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| 作者：未知 来源：本站原创 点击数：413 更新时间：2007-10-12 |
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ADI公司的音频编译码ADAV400嵌入了SigmaDSP 音频处理器,具有高度性能的模拟和数字I/O以及功能强大的音频专用的可编程内核,使设计者能是他们的产品具有音频性能差异化. 音频处理内核是基于ADI公司的SigmaDSP技术,具有28位处理能力(双精度模式为56位),是完全可编程的动态处理器,以及具有延迟存储器.广泛应用在ATV和AV的音频部分,TV的音频处理,机顶盒(STB),HTiB以及通用音频性能增强.本文主要介绍了ADAV400的主要性能,功成名就能方框图,以及应用电路图.
Audio Codec with Embedded SigmaDSP Processor ADAV400
The ADAV400 is an enhanced audio processor. Integrating high performance analog and digital I/Os with a powerful, audio-specific, programmable core enables designers to differentiate their products through audio performance.
The audio processing core is based on Analog Devices SigmaDSP® technology featuring full 28-bit processing (56-bit in double precision mode); a sophisticated, fully programmable dynamics processor; and delay memory.
This technology allows the system designer to compensate for real-world limitations of speakers, amplifiers, and listening environments. This compensation results in a dramatic improvement of the perceived audio quality through speaker equalization, multiband compression and limiting, and third-party-branded algorithms.
The analog I/O integrates Analog Devices proprietary continuous time, multibit, sigma-delta (Σ-Δ) architecture. This integration brings a higher level of performance to systems that are required to meet system branding certification by third-party algorithm providers. The analog inputs feature a 95 dB dynamic range stereo ADC fed from a four-stereo input mux. The four stereo analog outputs are each driven by a 95 dB dynamic range DAC. A dedicated headphone channel is included with integrated amplifiers.
The ADAV400 supports multichannel digital inputs and outputs. An integrated SRC on one channel provides the capability to support any input sample rate in the range of 5 kHz to 50 kHz, synchronizing this input to the internal DSP engine.
The ADAV400 is supported by a powerful graphical programming tool that includes blocks such as general filters, EQ filters, dynamics processing, mixers, volume, and third-party algorithms for fast development of custom signal flows.
主要特性:
Fully programmable audio digital signal processing (DSP) for enhanced sound processing
Scalable digital audio delay line
Pool of 400 ms @ 48 kHz (200 ms for stereo channel)
High performance, integrated analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
1 stereo analog input (ADC)
4 stereo analog inputs with mux-to-stereo ADC
4 stereo (8-channel) analog outputs (DACs)
Dedicated headphone output with integrated amplifier
Multichannel digital I/O
8-channel I2S input and output modes
8- and 16-channel TDM input and output modes
2-channel (1 stereo) asynchronous I2S input with integrated sample rate converter (SRC), supporting sample rates from 5 kHz to 50 kHz
Features SigmaStudio™, a proprietary graphical programming tool for fast development of custom signal flows
Includes various third-party audio algorithms
I2C control interface
Operates from 3.3 V (analog), 1.8 V (digital core), 3.3 V (digital interface)
Features on-chip regulator for single 3.3 V operation
80-lead LQFP (14 mm × 14 mm)
Temperature range: 0°C to 70°C
主要应用:
ATV and AV audio applications
TV audio processing
Set-top box (STB)
HTiB
General audio enhancement
图1:ADAV400功能方框图.
图2:ADAV400应用电路图.
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