[原创] ADI AD7768八路同时取样Σ－Δ ADC解决方案

ADI公司的AD7768是每路都集成了Σ-Δ调制器和数字滤波器的八路同时取样Σ-Δ模数转换器(ADC),最大输入带宽110.8kHz时的动态范围108dB, INL ±2 ppm,失调误差±50 μV,增益误差±30 ppm,每路的ADC数据输出速率256 kSPS,主要用在数据采集系统如USB/PXI/以太网,仪器和工业控制回路,音频测试和测量,三相电源质量分析,声呐,高精度医疗EEG/EMG/ECG以及振动和资产监测.本文介绍了AD7768主要特性,功能框图,以及评估板EVAL-AD7768FMCZ主要特点,电路图,材料清单和PCB设计图.

The AD7768 is an 8-channel, simultaneous sampling Σ-Δ analog-to-digital converter (ADC) with a Σ-Δ modulator and digital filter per channel, enabling synchronized sampling of ac and dc signals.

The AD7768 achieves 108 dB dynamic range at a maximum input bandwidth of 110.8 kHz, combined with typical performance of ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.

The AD7768 user can trade off input bandwidth, output data rate, and power dissipation. Select one of three power modes to optimize for noise targets and power consumption. The flexibility of the AD7768 allows it to become a reusable platform for low power dc and high performance ac measurement modules.
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