AD7768(U 2010)1 Reference Platform

Introduction

This document describes the DataStorm DAQ Platform when connected to a EVAL-AD7768-1FMCZ board containing the AD7768-1 device, and includes an example of how to initialize it.

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 has three modes: fast mode (256 kSPS maximum, 52.2 kHz input bandwidth, 26.4 mW per channel), median mode (128 kSPS maximum, 55.4 kHz input bandwidth, 19.7 mW per channel), and low power mode (32 kSPS maximum, 13.85 kHz input bandwidth, 6.75 mW per channel). It offers extensive digital filtering capabilities such as a wideband, low ±0.005 dB pass-band ripple, A low latency sinc5 filter, low latency sinc3 filter that is fully programmable, with 50 Hz/60 Hz rejection capabilities.

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. Wider bandwidth, up to 500 kHz Nyquist, 204 kHz, −3 dB, is available using the sinc5 filter, enabling a view of signals over an extended range.

Applications

• Sound and vibration, acoustic, and material science research and development
• Control and hardware in loop verification
• Condition monitoring for predictive maintenance
• Electrical test and measurement
• Audio testing and current and voltage measurement
• Clinical electroencephalogram (EEG), electromyogram (EMG), and electrocardiogram (ECG) vital signs monitoring
• USB-, PXI-, and Ethernet-based modular DAQ
• Channel to channel isolated modular DAQ designs

Supported Devices

• AD7768-1

Evaluation Boards

• EVAL-AD7768-1FMCZ

A platform is typically comprised of:

• Carrier card with SoC FPGA and FMC LPC connector
• ADI® FMC converter board

Example designs include:

• FPGA HDL code
• Linux operating system
• Custom IIO Linux device drivers with LibIIO libraries
• IIO Oscilloscope, a Linux user space application

Each platform is provided with a unique Quick Start Guide, ensuring a good out-of-box experience. Complete example design source code is provided in repositories. This includes source for Linux and FPGA HDL code.

The following platforms are available

• AD7768-1 Platform User Guide

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