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General description

The NAFE71388 is a highly configurable industrial-grade multichannel universal input

analog front-end (AFE) that meets high-precision measurement requirements. The

device integrates low-leakage, high-voltage (HV) fast multiplexers, low-offset and lowdrift

programmable gain amplifier (PGA) and buffers, high data-rate 24-bit Delta-Sigma

analog-to-digital converter (ADC), and low-drift voltage reference. All of the HV analog

pins are diode-protected internally for electromagnetic compatibility (EMC) and miswiring

scenarios. The NAFE71388 is equipped with various diagnostic and supplies supervisory

circuitry for condition monitoring and anomaly detection. Two precise calibration voltage

sources are made available for ease of end-to-end system self-calibration and predictive

maintenance.

The NAFE71388 family of products is designed for programmable logic controllers

(PLCs), I/O modules, data loggers, instrumentation, and high-precision sensor and data

acquisition systems.

Features and benefits

? Eight configurable HV inputs

– Single-ended or differential, with ranges up to ±25 V

– Independent configurations for voltage and current ranges

– Overvoltage protected up to ±36 V for less than one hour

? Fast data rates

– 15 SPS to 576 kSPS

– Simultaneous 50 Hz/60 Hz line rejection

– ENOB: 17-bit at 144 kSPS

? High accuracy

– 0.005 FS accuracy at room after user calibration

– 0.1 FS accuracy over -25 ℃ to 105 ℃

? System calibration

– End-to-end calibration with integrated precise voltage sources

– Accurate factory-calibrated products available

? ±3 ?C internal temperature sensor

? 0.2 internal oscillator accuracy at room temperature

? Diagnostic system for faults detection and prediction

? CRC error detection

? Ten GPIOs

? 32 MHz SPI interface

? Robust 8 kV HBM ESD and IEC61000-4-5 2 kV surge protection

? Power supply: HV: ±7 V to ±24 V, LV: 3.3 V

? 135 mW low power consumption

? Operating temperature range TA: -40 ℃ to +125 ℃

? Package: 64 pin, 9 mm x 9 mm x 0.85 mm HVQFN

Applications

? Data acquisition system

? PLC, DCS I/O modules

? Industrial automation and process control