TIDA-01583

Ultra-Low Noise Bias Voltage Reference Design for Microbolometer Detectors in Thermal Cameras

TIDA-01583

Design files

Overview

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
  • No. of 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)

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUDL8.PDF (3786 K)

Reference design overview and verified performance test data

TIDRVQ3.PDF (344 K)

Detailed schematic diagram for design layout and components

TIDRVQ4.PDF (57 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRVQ5.PDF (227 K)

Detailed overview of design layout for component placement

TIDRVQ7.ZIP (723 K)

Files used for 3D models or 2D drawings of IC components

TIDCEJ1.ZIP (304 K)

Design file that contains information on physical board layer of design PCB

TIDRVQ6.PDF (863 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS717150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision DACs (<=10MSPS)

DAC80508True 16-bit, 8-channel, SPI, voltage-output DAC in WCSP package with precision internal reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA219236-V, Precision, RRIO, Low Offset Voltage, Low Input Bias Current Op Amp With e-trim

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Ultra-Low-Noise, Program Bias, and PS Reference Design for Thermal Image Sensor Feb. 26, 2018

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