Product details

PGA/VGA PGA Number of channels (#) 2 Vs (Max) (V) 5 Vs (Min) (V) 2.7 Slew rate (Typ) (V/us) 0.5 Operating temperature range (C) -40 to 125
PGA/VGA PGA Number of channels (#) 2 Vs (Max) (V) 5 Vs (Min) (V) 2.7 Slew rate (Typ) (V/us) 0.5 Operating temperature range (C) -40 to 125
TSSOP (PW) 16 22 mm² 5 x 4.4
  • Complete Bridge Sensor Conditioner
  • Voltage Output: Ratiometric or Absolute
  • Digital Cal: No Potentiometers/Sensor Trims
  • Sensor Error Compensation
    • Span, Offset, and Temperature Drifts
  • Low Error, Time-Stable
  • Sensor Linearization Circuitry
  • Temperature Sense: Internal or External
  • Calibration Lookup Table Logic
    • Uses External EEPROM (SOT23-5)
  • Over/Under-Scale Limiting
  • Sensor Fault Detection
  • +2.7V TO +5.5V Operation
  • –40°C to +125°C Operation
  • Small TSSOP-16 Package
  • APPLICATIONS
    • Bridge Sensors
    • Remote 4-20mA Transmitters
    • Strain, Load, and Weigh Scales
    • Automotive Sensors
  • APPLICATIONS
    • Hardware Designer’s Kit (PGA309EVM)
      • Temperature Eval of PGA309 + Sensor
      • Full Programming of PGA309
      • Sensor Compensation Analysis Tool
  • All other trademarks are the property of their respective owners.

    • Complete Bridge Sensor Conditioner
    • Voltage Output: Ratiometric or Absolute
    • Digital Cal: No Potentiometers/Sensor Trims
    • Sensor Error Compensation
      • Span, Offset, and Temperature Drifts
    • Low Error, Time-Stable
    • Sensor Linearization Circuitry
    • Temperature Sense: Internal or External
    • Calibration Lookup Table Logic
      • Uses External EEPROM (SOT23-5)
    • Over/Under-Scale Limiting
    • Sensor Fault Detection
    • +2.7V TO +5.5V Operation
    • –40°C to +125°C Operation
    • Small TSSOP-16 Package
    • APPLICATIONS
      • Bridge Sensors
      • Remote 4-20mA Transmitters
      • Strain, Load, and Weigh Scales
      • Automotive Sensors
  • APPLICATIONS
    • Hardware Designer’s Kit (PGA309EVM)
      • Temperature Eval of PGA309 + Sensor
      • Full Programming of PGA309
      • Sensor Compensation Analysis Tool
  • All other trademarks are the property of their respective owners.

    The PGA309 is a programmable analog signal conditioner designed for bridge sensors. The analog signal path amplifies the sensor signal and provides digital calibration for zero, span, zero drift, span drift, and sensor linearization errors with applied stress (pressure, strain, etc.). The calibration is done via a One-Wire digital serial interface or through a Two-Wire industry-standard connection. The calibration parameters are stored in external nonvolatile memory (typically SOT23-5) to eliminate manual trimming and achieve long-term stability.

    The all-analog signal path contains a 2x2 input multiplexer (mux), auto-zero programmable-gain instrumentation amplifier, linearization circuit, voltage reference, internal oscillator, control logic, and an output amplifier. Programmable level shifting compensates for sensor dc offsets.

    The core of the PGA309 is the precision, low-drift, no 1/f noise Front-End PGA (Programmable Gain Amplifier). The overall gain of the Front-End PGA + Output Amplifier can be adjusted from 2.7V/V to 1152V/V. The polarity of the inputs can be switched through the input mux to accommodate sensors with unknown polarity output. The Fault Monitor circuit detects and signals sensor burnout, overload, and system fault conditions.

    For detailed application information, see the PGA309 User's Guide (SBOU024) available for download at www.ti.com.

    The PGA309 is a programmable analog signal conditioner designed for bridge sensors. The analog signal path amplifies the sensor signal and provides digital calibration for zero, span, zero drift, span drift, and sensor linearization errors with applied stress (pressure, strain, etc.). The calibration is done via a One-Wire digital serial interface or through a Two-Wire industry-standard connection. The calibration parameters are stored in external nonvolatile memory (typically SOT23-5) to eliminate manual trimming and achieve long-term stability.

    The all-analog signal path contains a 2x2 input multiplexer (mux), auto-zero programmable-gain instrumentation amplifier, linearization circuit, voltage reference, internal oscillator, control logic, and an output amplifier. Programmable level shifting compensates for sensor dc offsets.

    The core of the PGA309 is the precision, low-drift, no 1/f noise Front-End PGA (Programmable Gain Amplifier). The overall gain of the Front-End PGA + Output Amplifier can be adjusted from 2.7V/V to 1152V/V. The polarity of the inputs can be switched through the input mux to accommodate sensors with unknown polarity output. The Fault Monitor circuit detects and signals sensor burnout, overload, and system fault conditions.

    For detailed application information, see the PGA309 User's Guide (SBOU024) available for download at www.ti.com.

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    Technical documentation

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    Type Title Date
    * Data sheet Voltage Output Programmable Sensor Conditioner datasheet (Rev. C) 14 Jan 2011
    * User guide PGA309 User's Guide (Rev. B) 13 Jan 2011
    Application note How to Select Amplifiers for Pressure Transmitter Applications (Rev. A) 27 Jul 2021
    Application note Multichannel Analog Input Modules for PLC Equipment 04 Jan 2019
    User guide Multi-Cal-System Evaluation Module User's Guide (Rev. B) 15 Sep 2016
    User guide PGA309EVM-USB User Guide (Rev. B) 31 Aug 2016
    Analog design journal Ratiometric measurement in the context of LVDT-sensor signal conditioning 21 Jul 2016
    Technical article Industrial DACs: How to protect 2-wire transmitters 20 Feb 2015
    Analog design journal 4Q 2011 Issue Analog Applications Journal 09 Nov 2011
    Analog design journal Analog linearization of resistance temperature detectors 09 Nov 2011
    User guide Multi-Cal-PGA309 System User Guide 27 Apr 2011
    User guide Multi-Cal-Master User's Guide 22 Aug 2010
    User guide Multi-Cal-Test Users Guide 22 Aug 2010
    Application note Using the XTR115 with the PGA309 to Generate 4mA to 20mA Output (Rev. B) 20 Apr 2006
    Application note PGA309 Quick Start System Reference Guide (Rev. C) 13 Jan 2006
    Application note PGA309 Noise Filtering (Rev. A) 28 Nov 2005
    Application note Practical Technique for Minimizing the Number of Measurements in Sensor Signal 28 Jun 2005
    Application note PGA309 Microcontroller Application 07 Jun 2005
    User guide Using PGA309 for Sensor Compensation 11 Mar 2004

    Design & development

    For additional terms or required resources, click any title below to view the detail page where available.

    Evaluation board

    MULTI-CAL-SYSTEM — Multi-Cal-System Basic Starter Kit

    The Multi-Cal-System is a system of evaluation modules and accessories that can be used to calibrate multiple PGA308 sensor modules. The Multi-Cal-System can be configured to calibrate from 8 to 64 PGA308s simultaneously. The key component of the Multi-Cal-System is the Multi-Cal-System Starter (...)

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    Evaluation board

    PGA309EVM-USB — PGA309 Evaluation Module

    The PGA309EVM-USB key hardware consists of two boards, PGA309 Test Board and USB DAQ Platform. The PGA309 Test Board contains the PGA309, terminal strips for external connections, several jumpers for device configuration, and support circuitry. The PGA309 Test Board can be used to fully test your (...)

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    Evaluation board

    SENSOREMULATOREVM — SensorEmulatorEVM Evaluation Module

    The SensorEmulatorEVM provides a complete system for strain and temperature emulation of voltage-excited bridge sensors. The SensorEmulatorEVM uses rotary selector switches and potentiometers to emulate the operation of a voltage-excited Wheatstone resistive bridge sensor at discrete operating (...)

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    Support software

    PGA309EVM-USB Software (Rev. C)

    SBOC320C.ZIP (110347 KB)
    Support software

    PGA309EVM-USB Source Code (Rev. A)

    SBOC394A.ZIP (5216 KB)
    Support software

    Multi-Cal-PGA309 System Software (Rev. A)

    SBOC401A.ZIP (257852 KB)
    Simulation tool

    PSPICE-FOR-TI — PSpice® for TI design and simulation tool

    PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
    Simulation tool

    TINA-TI — SPICE-based analog simulation program

    TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
    Calculation tool

    PGA309 Calculator Source Code

    SBOC132.ZIP (130 KB)
    Calculation tool

    PGA309 Gain Calculator (Rev. D)

    SLVC073D.ZIP (2463 KB)
    Schematic

    PGA309EVM-USB Schematic

    SBOR010.PDF (44 KB)
    Schematic

    Multi-Cal-Master Schematics

    SBOR011.ZIP (585 KB)
    Schematic

    Multi-Cal-Slave Schematic

    SBOR015.PDF (535 KB)
    Reference designs

    TIPD126 — Bridge Sensor Signal Conditioner with Current Loop Output, EMC Protection

    This bridge sensor conditioner module delivers a well-regulated current output to a ground-referenced load. The first stage uses a mixed-signal programmable gain amplifier (PGA) to provide linearization and temperature compensation to a differential bridge sensor voltage. The second stage converts (...)
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    Ordering & quality

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    • Ongoing reliability monitoring

    Support & training

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