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

(ACTIVE) TIDA-01583

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Key Document

Description

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)

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Schematic/Block Diagram

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DAC80508  True 16-bit, 8-channel, SPI, voltage-output DAC in WCSP package with precision internal reference  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
OPA2192  36-V, Precision, RRIO, Low Offset Voltage, Low Input Bias Current Op Amp With e-trim  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS717  150mA, High PSRR, Low Quiescent Current, Low Noise LDO  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
DAC80508 Download Download
OPA2192 Download
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TPS717 Download Download
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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date
PDF 3786 26 Feb 2018
Design files (6)
Title Abstract Type Size (KB) Date
ZIP 304 26 Feb 2018
ZIP 723 26 Feb 2018
PDF 863 26 Feb 2018
PDF 227 26 Feb 2018
PDF 57 26 Feb 2018
PDF 344 26 Feb 2018

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