CN-0177 Circuit Note describes how to use the AD5781 18-bit true voltage output DAC and AD8676 ultra-high precision, 36 V, 2.8 nV√Hz dual rail-to-rail output operational amplifier to create an 18-bit, linear, low-noise, precision dual-polarity ±10 V DC voltage source.
This application note presents a tested circuit design for a high-precision, low-noise, bipolar ±10 V DC voltage source. The design integrates the AD5781 18-bit voltage-output DAC, the AD8676 ultra-precision dual op amp, and the ADR445 ultra-low noise LDO reference voltage source. The circuit is intended for high-precision system integration applications requiring high accuracy and low nonlinearity error. This manual is written in Chinese.
The AD5781 can be configured with a gain of 2 using external components.
The peak-to-peak noise measures 43.33 μV over a 100-second interval.