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Analog Devices Inc. AD4110-1 Universal Input AFE with 24-Bit ADC

Analog Devices Inc. AD4110-1 Universal Input AFEs with 24-bit ADC are complete, single-channel, universal input analog-to-digital front ends for industrial process control systems that require sensor type flexibility. The high voltage input is fully software configurable for current or voltage signals. It enables direct interface to all standard industrial analog signal sources and all thermocouple types. Field power can be supplied for loop-powered current output sensors. The modules include a range of excitation current sources for resistance-temperature detector (RTD) sensors and other resistive sensors. The integrated, fully differential programmable gain amplifier (PGA) offers 16 gain settings from 0.2 to 24. Analog Devices Inc. AD4110-1 Universal Input AFEs incorporate a precision 24-bit, Σ-Δ, analog-to-digital converter (ADC) and come in a 40-lead, 6mm x 6mm LFCSP package.

Features

  • 2 software-programmable input terminals
    • Up to ±20mA current
    • Up to ±10V voltage
    • Thermocouple
    • RTD
  • Replaces existing 3-terminal solutions
  • Field power supply for loop-powered current sensors
  • HV input overvoltage protected up to ±30V
  • Internal current sense resistor
  • Option to use external current sense resistor
  • Current limited input, even with no power supply
  • Diagnostic functions for over-range and open-wire detect
  • Fast and flexible output data rates of 5SPS to 125kSPS
    • 16 noise-free bits at 62kSPS
    • 18 noise-free bits at 2.5kSPS
    • 20 noise-free bits at 50SPS/60SPS
  • Simultaneous 50Hz and 60Hz rejection
  • Serial interface for configuration and diagnostics
    • 4-wire interface compatible with SPI®, QSPI™, MICROWIRE®, and DSP
  • ±12V to ±20V, and +5V power supply
  • -40°C to +105°C operating temperature range
  • 40-lead, 6mm x 6mm LFCSP package

Applications

  • Process control and industrial automation
  • Remote and distributed control systems
  • Instrumentation and measurement
  • Sensor and data acquisition

Functional Block Diagram

Block Diagram - Analog Devices Inc. AD4110-1 Universal Input AFE with 24-Bit ADC

Application Note

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Published: 2019-10-18 | Updated: 2025-03-04