ADAU1702:SigmaDSP(R) 28/56位音频处理器，内置两个ADC和四个DAC
ADAU1702是一款完整的单芯片音频系统，内置28/56位音频DSP、ADC、DAC及类似微控制器的控制接口。信号处理技术包括均衡、分频、低音增强、多频段动态处理、延迟补偿、扬声器补偿和立体声声像加宽，可以用来弥补扬声器、功放和听音环境的实际限制，从而明显改善音质体验。
这种信号处理技术堪比高端演播室设备所用的技术。大部分处理采用完全56位双精度模式完成，因而低电平信号性能极佳。ADAU1702是一款完全可编程的DSP。借助方便易用的SigmaStudio软件，用户可以利用双二阶滤波器、动态处理器、电平控制和GPIO接口控制等模块，以图形方式配置自定义信号处理流程。
ADAU1702程序可以在上电时通过其自引导机制从串行EEPROM加载，或者从外部微控制器加载。关断时，可以将参数的当前状态从ADAU1702写回EEPROM，以便下次运行程序时重新调用。两个Σ-Δ型ADC和四个Σ-Δ型DAC提供98.5 dB的模拟输入至模拟输出动态范围。各ADC的THD + N为-83 dB，各DAC的THD + N为-90 dB。利用数字输入和输出端口，可以与其它ADC和DAC实现无缝连接。ADAU1702通过I2C总线或四线式SPI端口进行通信。
The ADAU1702 is a complete single-chip audio system with a 28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like control interfaces. Signal processing includes equalization, cross-over, bass enhancement, multiband dynamics processing, delay compensation, speaker compensation, and stereo image widening and can be used to compensate for real-world limitations of speakers, amplifiers, and listening environments, providing a dramatic improvements of perceived audio quality.
Its signal processing is comparable to that found in high end studio equipment. Most processing is done in full 56-bit, double-precision mode, resulting in very good low level signal performance. The ADAU1702 is a fully programmable DSP. The easy to use SigmaStudio software allows the user to graphically configure a custom signal processing flow using blocks such as biquad filters, dynamics processors, level controls, and GPIO interface controls.
ADAU1702 programs can be loaded on power-up either from a serial EEPROM through its own self-boot mechanism or from an external microcontroller. On power-down, the current state of the parameters can be written back to the EEPROM from the ADAU1702 to be recalled the next time the program is run.
Two Σ-Δ ADCs and four Σ-Δ DACs provide a 98.5 dB analog input to analog output dynamic. Each ADC has a THD + N of -83 dB, and each DAC has a THD + N of -90 dB. Digital input and output ports allow a glueless connection to additional ADCs and DACs. The ADAU1702 communicates through an I^2C(R) bus or a 4-wire SPI(R) port.
ADAU1702 特点
- 28-/56位、25 MIPS数字音频处理器
- 2个ADC：SNR为100 dB，THD + N为-83 dB
- 4个DAC：SNR为104 dB，THD + N为-90 dB
- 完全独立工作 从串行EEPROM自引导 辅助ADC配有4路输入多路复用器，用于模拟控制 GPIOs 用于数字控制和输出
- 可利用SigmaStudioTM图形工具实现完全编程
- 28位× 28位乘法器，内置56位累加器，可实现完全双精度处理
- 时钟振荡器可从晶振产生主时钟
- 欲了解更多特性，请参考数据手册
- 28-/56-bit, 25 MIPS digital audio processor
- Two ADCs: SNR of 100 dB, THD + N of -83 dB
- Four DACs: SNR of 104 dB, THD + N of -90 dB
- Complete standalone operation Self-boot from serial EEPROM Auxiliary ADC with 4-input mux for analog control GPIOs for digital controls and outputs
- Fully programmable with SigmaStudioTM graphical tool
- 28-bit × 28-bit multiplier with 56-bit accumulator for full double-precision processing
- Clock oscillator for generating master clock from crystal
- Please see data sheet for additional features
ADAU1702 技术指标
- Instructions/Cycles: 512
- DAC DNR (dB): 104dB
- DAC THD+N @ 1 kHz (-3dB): 90dB
- Digital I/O Channels: 8/8
- Analog I/O Channels: 2/4
- Product Description: 28-/56-bit audio processor with 2 ADCs and 4 DACs
ADAU1702 应用领域
- 多媒体扬声器系统
- MP3播放器扬声器埠
- 汽车音响主机
- 迷你型立体声系统
- 数字电视
- 演播室监听系统
- 扬声器分频器
- 乐器音效处理器
- 座椅音响系统（飞机/长途汽车）
ADAU1702 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADAU1702JSTZ | 量产 | 48 ld LQFP | 48 | 商业 |
| ADAU1702JSTZ-RL | 量产 | 48 ld LQFP | 48 | 商业 |