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PGA305 Signal Conditioner

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PGA305 Signal Conditioner

Texas Instruments' PGA305 is for resistive sensing and analog outputs in a variety of applications to measure pressure and temperature

Texas Instruments' PGA305 device supplies an interface for piezoresistive and strain-gauge, pressure-sense elements. It is a full system-on-chip (SoC) solution that features programmable analog front-end (AFE), analog-to-digital converter (ADC), and digital signal processing (DSP) that enable direct connection to the sense element. The PGA305 includes integrated voltage regulators and an oscillator that minimizes the number of external components. It can employ third-order temperature and nonlinearity compensation to achieve high accuracy. This device uses the integrated I2C interface or the one-wire serial interface (OWI) to achieve external communication and simplify the system calibration process. An integrated digital-to-analog converter (DAC) supports absolute-voltage, ratiometric-voltage, and 4 mA to 20 mA current-loop outputs.

  • Analog features:
    • Analog front-end for resistive bridge sensors
    • Accommodates sensor sensitivities from 1 mV/V to 135 mV/V
    • On-chip temperature sensor
    • Programmable gain
    • 24-bit Sigma Delta ADC for signal channel
    • 24-bit Sigma Delta ADC for temperature channel
    • 14-bit output DAC
  • General features:
    • Industrial temperature range: -40°C to +150°C
    • Power supply:
      • On-chip power management accepts wide power supply voltage from 3.3 V to 30 V
      • Integrated reverse protection circuit
  • Digital features:
    • < 0.1% full-scale output (FSO) accuracy across temperature
    • System response time: < 220 µs
    • Third-order offset, gain, and nonlinearity temperature compensation
    • Diagnostic functions
    • Integrated EEPROM for device operation, calibration data, and user data
  • Peripheral features:
    • I2C interface for data reading and device configuration
    • OWI enables communication through the power supply pin without using additional lines
    • 4 mA to 20 mA current loop interface
    • Ratiometric and absolute voltage output
  • Liquid-level meter, flow meters
  • Resistive field transmitters
  • Pressure-sensor transmitters and transducers