Analog Devices Inc. AD7768 24位ADC
Analog Devices AD7768 8通道/4通道、24位、Σ-Δ ADC的每个通道都包括一个Σ-Δ调制器和数字滤波器，以提供交流和直流信号的同步采样。AD7768 ADC的每个通道均可实现最高256kSPS的输出数据速率。AD7768 ADC实现了108dB动态范围，输入带宽达110.8kHz。典型的性能额定值包括±2ppm积分非线性 (INL)、±50µV偏置误差、±30ppm增益误差和−120dB总谐波失真 (THD)。
设计人员可以从AD7768的快速模式、中速模式和生态功耗模式中进行选择，以优化噪声性能和功耗。AD7768 ADC 有三种功率模式可选，同时提供用于低功率直流和高性能交流测量模块的可重复使用平台。
AD7768 ADC还具有广泛的数字滤波功能，sinc响应（通过sinc5滤波器）、低带宽的低延迟路径和低噪声测量。
特性
- 精密交流和直流性能
8通道同步采样
每个通道的输出数据速率：256kSPS
动态范围：108dB
输入带宽：110.8kHz（−3dB带宽 (BW)）
总谐波失真(THD)：−120dB（典型值）
±2ppm满量程范围 (FSR) 积分非线性 (INL)、±50μV偏置误差、±30ppm增益误差
经过优化的功耗、噪声和输入带宽
可选功耗、速度和输入带宽
快速：最高速度；110.8kHz BW，每通道51.5mW
中速：半速，55.4kHz BW、每通道27.5mW
生态：最低功耗，13.8kHz BW，每通道9.375mW
输入带宽范围：直流至110.8kHz
可编程输入带宽/采样率
数据接口支持循环冗余校验 (CRC) 错误检查
菊花链
线性相位数字滤波器
低延迟sinc5滤波器
宽带砖墙式滤波器：±0.005dB纹波（直流至102.4kHz） - 模拟输入预充电缓冲器
电源
AVDD1 = 5V，AVDD2 = 2.25V - 5V
IOVDD = 2.5V - 3.3V或IOVDD = 1.8V
64引脚LQFP封装，无焊盘
温度范围：−40°C 到 +105°C
应用
- 数据采集系统：USB/PXI/以太网
- 仪器仪表与工业控制环路
- 音频测试与测量
- 振动与资产情况监控
- 三相电源质量分析
- 声纳
- 高精度医疗EEG/EMG/ECG
框图
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