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

Analog Devices AD4110-1 Universal Input AFE with 24-Bit ADC is a complete, single-channel, universal input analog-to-digital front end for industrial process control systems where sensor type flexibility is required. The high voltage input is fully software configurable for current or voltage signals. It allows direct interface to all standard industrial analog signal sources such as ±20mA, ±4mA to ±20mA, ±10V, and all thermocouple types. Field power can be supplied for loop-powered current output sensors. A range of excitation current sources for resistance temperature detector (RTD) sensors and other resistive sensors are included. The integrated, fully differential programmable gain amplifier (PGA) offers 16 gain settings from 0.2 to 24.

The high voltage input can be programmed to power up in either voltage mode or current mode. When programmed in current mode, the unique input circuit architecture provides a path for the loop current, even in the absence of the system module power supply. The AD4110-1 provides internal, front-end diagnostic functions to indicate overvoltage, Undervoltage, open wire, overcurrent, and overtemperature conditions. The high voltage input is thermally protected, overcurrent limited, and overvoltage protected. The AD4110-1 incorporates a precision 24-bit, Σ-Δ, analog-to-digital converter (ADC) offering conversion rates from 5SPS to 125kSPS with simultaneous 50Hz and 60Hz noise rejection.


  • 2 software-programmable input terminals
    • Current up to ±20mA
    • Voltage up to ±10V
    • Thermocouple
    • RTD
  • Replaces existing 3-terminal solutions
  • Field power supply for loop-powered current sensors
  • HV input overvoltage protected up to ±30V
  • An internal current sense resistor
  • Option to use an 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: 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
  • Power supply: ±12V to ±20V, +5V
  • Operating temperature: -40°C to +105°C
  • Package: 40-lead, 6mm × 6mm LFCSP


  • 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
Published: 2019-10-18 | Updated: 2022-03-10