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Texas Instruments PGA305 Signal Conditioner

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

Features

  • Analog Features
    • Analog Front-End for Resistive Bridge Sensors
    • Accommodates Sensor Sensitivities From 1mV/V to 135mV/V
    • On-Chip Temperature Sensor
    • Programmable Gain
    • 24-Bit Sigma-Delta Analog-to-Digital Converter for Signal Channel
    • 24-Bit Sigma-Delta Analog-to-Digital Converter for Temperature Channel
    • 14-Bit Output DAC
  • Digital Features
    • < 0.1% FSO Accuracy Across Temperature
    • System Response Time < 220µs
    • 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
    • One-Wire Interface Enables Communication Through the Power Supply Pin Without Using Additional Lines
    • 4mA to 20mA Current Loop Interface
    • Ratiometric and Absolute Voltage Output
    • Power Management Control
    • Analog Low-Voltage Detect
  • General Features
    • Industrial temperature range of -40°C to 150°C
    • Power Supply
      • On-Chip Power Management Accepts Wide Power-Supply Voltage From 3.3V to 30V
      • Integrated Reverse-Protection Circuit

Applications

  • Pressure-Sensor Transmitters and Transducers
  • Liquid-Level Meter, Flow Meters
  • Resistive Field Transmitters

Simplified Block Diagram

Block Diagram - Texas Instruments PGA305 Signal Conditioner

Additional Resources

Publicado: 2018-09-12 | Actualizado: 2023-10-30