MAXREFDES74#: 18-bit high-precision data acquisition system

Overview

The MAXREFDES74# reference design performs high-speed, 18-bit, high-precision data acquisition and is based on Maxim's leading-edge, high-precision, low-power data converters . MAXREFDES74# is designed as a module for high-speed, low-power, high-precision data acquisition and control systems in industrial process control and automation , as well as high-speed protection systems in power distribution and automation. 16-bit data acquisition systems can also be tested with pin-compatible 16-bit ADC and DAC devices such as the MAX11166 and MAX5316 .

Features of the MAXREFDES74# reference design include:

• Power and data isolation

• Flexible, configurable inverting or non-inverting input method

• Unipolar or bipolar input (ADC) and output (DAC)

MAX11156

• 18-bit resolution, no missing codes

• Signal-to-noise ratio: 94.4dB

• Total harmonic distortion: -107dB @ 1kHz

• Buffered internal or external voltage reference input

• Internal reference has a temperature coefficient of -6ppm/°C (typ)

• 5V single power supply

• True bipolar ±5V input range

MAX5318

• 18-bit resolution, no missing codes

• High accuracy ±2 LSB INL (maximum)

• 3µs settling time

• User programmable offset and gain calibration

• ±0.5ppm/°C (typ) offset and gain drift (all temperature range)

• Loading/sensing output

• 50MHz SPI compatible interface, 1.8V to 5.5V logic levels