ADAV4322: 用于高级电视的音频处理器,内置声音IF解调器和立体声解码器
The ADAV43x2/ADAV44x2 are part of a family of enhanced audio processors targeting advanced TV applications, with full support for digital and analog baseband audio as well as multistandard broadcast SIF demodulation and decoding.
The audio processor, by default, loads a dedicated TV audio flow that incorporates full matrix switching (any input to any output), automatic volume control that compensates for volume changes during advertisements or when switching channels, dynamic bass, a multiband equalizer, and up to 200 ms of stereo delay memory for audio-video synchronization.
Alternatively, Analog Devices offers an award-winning graphical programming tool (SigmaStudioTM) that allows custom flows to be quickly developed and evaluated. This allows the creation of customer-specific audio flows, including the use of Analog Devices' library of third-party algorithms.
The analog I/O integrates Analog Devices' proprietary continuous-time, multibit Σ-Δ architecture to bring a higher level of performance to ATV systems, required by third-party algorithm providers to meet system branding certification. The analog input is provided by 95 dB dynamic range (DNR) ADCs, and the analog output is provided by 95 dB DNR DACs.
The main speaker outputs can be supplied as a voltage out from the integrated DAC channels (ADAV4312 and ADAV4322) or as a digitally modulated PWM stream to support digital amplifiers (ADAV4412 and ADAV4422).
The ADAV43x2/ADAV44x2 include multichannel digital inputs and outputs. In addition, two of the digital input channels can be routed through integrated sample rate converters (SRC), which are capable of supporting any arbitrary sample rate from 5 kHz to 50 kHz.
在默认情况下,音频处理器可提供从任一输入到任一输出的全矩阵切换的专用电视音频流；用于在插播广告或切换频道时补偿音量变化的自动音量控制；动态低音调节、多频带均衡器；以及用于音/视频同步的高达200 ms的立体声延迟存储器。
同时,ADI公司提供获奖的图形化编程工具（SigmaStudioTM）,允许定制流的快速开发与评估。该工具可生成用户专用的音频流,包括使用ADI第三方算法库。
模拟I/O集成了ADI公司特有的连续的、多比特Σ-Δ架构,为高级电视系统带来更高级的性能,满足第三方算法供应商进行系统商标认证所需。模拟输入由95 dB动态范围(DNR)的ADC提供,模拟输出则由95 dB动态范围(DNR)的DAC提供。主扬声器输出可由集成DAC通道（ADAV4312与ADAV4322）的输出电压供电,或作为数字调制PWM流来支持数字放大器 （ADAV4412与ADAV4422）。ADAV43x2/ADAV44x2包括多通道数字输入和输出。此外,还有两个数字输入通道,可经由综合采样率转换器（钢骨混凝土） ,这是能够支持从5千赫至50千赫的任意采样率。
ADAV4322 特点
- 中音频处理器 SIF解调器和广播立体系统解码
- 用于高级电视音响的完全可编程28-bit音频处理器,在复位时可以加载缺省音频流
- 支持ADI公司的SigmaStudioTM以及第三方伙伴为定制设计开发的专有算法。
- High performance 24-bit ADC and DAC 95 dB DNR performance on DAC channels 95 dB DNR performance on ADC channels
Dual headphone outputs with integratedamplifiers - 24-bit ADC和DAC的高性能 DAC通道上的95 dB DNR性能 ADC通道上的95 dB DNR性能 具有集成放大器的双重耳机输出
- 4路立体声同步数字I2S(R)输入通道
- 集成2个立体声异步I2S通道
- 采样率转换（SRC）功能支持5 kHz～50 kHz的输入采样速率
- 1个立体声同步数字I2S输出
ADAV4322 技术指标
- # ADC Input Channels: 4
- # DAC Outputs: 11
- ADC THD+N (dB): -90dB
- DAC DNR (dB): 95dB
- DAC THD+N @ 1 kHz (-3dB): 85dB
- Digital I/O Channels: 8/2
- Instructions/Cycles: 2560
ADAV4322 应用领域
- General-purpose consumer audio postprocessing Home audio DVD-Rs Home-theater-in-a-box (HTIB) systems and DVD receivers
- Audio processing subsystems for DTV-ready TVs
- Analog broadcast capability for iDTVs
- 通用消费类音频后处理
- 家庭音频
- DVD录像机
- 家庭影院（HTIB）系统与DVD接收机 - 用于DTV-ready电视的音频处理子系统
- 用于iDTV的模拟广播能力
ADAV4322 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADAV4322BSTZ | 量产 | 80 ld LQFP (14x14mm) | 80 | 待定 |