TIDA-01583: Ultra-Low Noise Bias Voltage Reference Design for Microbolometer Detectors

Summary

Uncooled microbolometer detectors require accurate and ultra-low noise bias voltages for their operation. Such requirements cannot be simply met by switching power supplies, LDO or DAC outputs. Enabled by Texas Instruments’ precision DAC, low noise precision amplifier and high PSRR, low noise LDO, this reference design demonstrates how to generate accurate and ultra-low noise programmable bias voltages and power supplies for uncooled microbolometer detectors at low cost.

Features

  • Total output noise < 4µVRMS from 0.1Hz to 1MHz

  • Voltage accuracy better than ±10mV

  • Based on a true 16-bit, R-2R DAC with buffered rail-to-rail voltage output

  • Four programmable voltage outputs

  • Easily scalable in terms of DAC resolution, voltage range, number of channels

  • Output current capability: 10mA (without BJT) and 75mA (with external BJT)

Specifications

Manufacturer Texas Instruments
Category Other Solutions
Eval Board -
Purpose Ultra-Low-Noise Programmable Bias and Power Supply
Design Author Texas Instruments
Application / Target Market Auxiliary Power Supply
LCD and OLED Bias Supplies
Test and Measurement Equipment
Main I.C. Base Part DAC80508
OPA2192
TPS717
Date Created By Author 2018-02
Date Added To Library 2018-07

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