NXP Semiconductors N-AFE 8-Channel Analog Front-End ICs

NXP Semiconductor N-AFE 8-Channel Analog Front-End (AFE) ICs are highly configurable industrial-grade multichannel universal input AFEs that meet high-precision measurement requirements. The devices integrate low-leakage, high-voltage (HV) fast multiplexers, a low-offset / low-drift programmable gain amplifier (PGA) and buffers, a high data-rate 24-bit Delta-Sigma analog-to-digital converter (ADC), and a low-drift voltage reference. The NAFE11388 and NAFE71388 ICs are equipped with various diagnostic and supply supervisory circuitry allowing condition monitoring and anomaly detection. Two precise calibration voltage sources ease end-to-end system self-calibration and predictive maintenance. Applications include programmable logic controllers (PLCs), I/O modules, data loggers, instrumentation, and high-precision sensor / data acquisition systems.

Features

  • Up to 8 software-configurable channels
    • Voltage, current, RTD, thermocouple
    • ±0.15 to ±12.5 ranges for single-ended signals
    • ±40V protection against miswiring
  • High accuracy
    • 0.002% system accuracy at room
    • 0.05% system accuracy over temperature
    • 10ppm maximum system level non-linearity
  • High precision, 180dB dynamic range
    • 17-bit ENOB at 7µs/reading for single input
    • 17-bit ENOB at 36µs/reading for multi-input
    • 1.0µVrms at 2.25ksps
    • 0.2µVrms at 60sps and 50sps
  • Fast and flexible data acquisition
    • 20µs/reading for multi-inputs
    • Fast and configurable sequencer to offload EP
    • Fast and flexible reading modes
  • Digital factory calibration and self-calibration
    • 24-bit wide x 48-word deep NVM for calibration coefficients
    • Internal sources for system self-calibration
  • Advanced protection and diagnostic
    • Supplies monitoring, UVLO, OVD on signal path
    • Redundant voltage reference and temp sensor
    • BIST for complete signal path monitoring and for failure and aging prediction

Applications

  • Data acquisition system
  • PLC and DCS I/O modules
  • Industrial automation and process control

Specifications

  • NAFE11388 IC
    • 7.5 to 288k sample/s
    • 17bit ENOB at 72ksample/s
    • 125mW typical quiescent consumption
  • NAFE71388 IC
    • 15 to 576k sample/s
    • 17bit ENOB at 144ksample/s
    • 135mW typical quiescent consumption

Videos

Block Diagram

NXP Semiconductors N-AFE 8-Channel Analog Front-End ICs

NXP Semiconductors N-AFE 8-Channel Analog Front-End ICs