ADI AD7768-1F 24位Σ－Δ模拟数转换器(ADC)解决方案

ADI公司的AD7768-1F是低功耗高性能24位Σ-Δ模拟数转换器(ADC),集成了Σ-Δ调制器和数字滤波器,以用于AC和DC信号的精密转换,动态范围108.5dB,失调误差±30 μV,增益误差±30 ppm, INL±1.1 ppm,低波纹FIR 带宽(BW)为DC到110.8kHz,适用于单路低功耗数据收集系统(DAQ)设计,主要用在仪器和传感器类型,声音和振动,声学和材料科学研究和开发,闭环验证的控制和硬件,电测试和测量,音频测试以及电压与电流测量,门诊EEG,EMG和EGG生命体征监测,基于USB,PXI和以太网的模块DAQ,以及通路隔离的模块DAQ设计.本文介绍了AD7768-1F主要特性,功能框图已以及评估板EV-AD7768-1FMCZ主要特性,电路图,材料清单和PCB设计图.
The AD7768-1 is a low power, high performance, Σ-Δ analog-to-digital converter (ADC), with a Σ-Δ modulator and digital filter for precision conversion of both ac and dc signals. The AD7768-1 is a single-channel version of the AD7768, an 8-channel, simultaneously sampling, Σ-Δ ADC. The AD7768-1 provides a single configurable and reusable data acquisition (DAQ) footprint, which establishes a new industry standard in combined ac and dc performance and enables instrumentation and industrial system designers to design across multiple measurement variants for both isolated and nonisolated applications.
The AD7768-1 achieves a 108.5 dB dynamic range when using the low ripple, finite impulse response (FIR) digital filter at 256 kSPS, giving 110.8 kHz input bandwidth (BW), combined with ±1.1 ppm integral nonlinearity (INL), ±30 μV offset error, and ±30 ppm gain error.A wider bandwidth, up to 500 kHz Nyquist (filter −3 dB point of 204 kHz), is available using the sinc5 filter, enabling a view of signals over an extended range.
The AD7768-1 offers the user the flexibility to configure and optimize for input bandwidth vs. output data rate (ODR) and vs. power dissipation. The flexibility of the AD7768-1 allows dynamic analysis of a changing input signal, making the device particularly useful in general-purpose DAQ systems. The selection of one of three available power modes allows the designer to achieve required noise t...