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)

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


  




TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DAC80508  8-Channel, True 16-Bit, SPI, Voltage-Output DAC With Precision Internal Reference  Digital-to-Analog Converters (DACs)  Sample & Buy Not Available
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  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

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 Views TI Recommends
PDF 3786 26 Feb 2018 186
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 304 26 Feb 2018 65
ZIP 723 26 Feb 2018 50
PDF 863 26 Feb 2018 35
PDF 227 26 Feb 2018 32
PDF 57 26 Feb 2018 53
PDF 344 26 Feb 2018 359

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