1 General description

The NAFE73388 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 low-drift programmable gain amplifier (PGA) and buffers, high data-rate 24-bit Delta-Sigma analog-to-digital converter (ADC), precise voltage and current excitation source, and low-drift voltage reference. All of the HV analog pins are diode-protected internally for electromagnetic compatibility (EMC) and miswiring scenarios. The NAFE73388 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 NAFE73388 family of products is designed for programmable logic controllers (PLCs), I/O modules, data loggers, instrumentation, and high-precision sensor and data acquisition systems.

2 Features and benefits

• Eight configurable HV inputs

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

– Independent configurations for voltage, current, resistance, resistance temperature detector (RTD),

thermocouple

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

• Programmable voltage gain: 0.2 to 16 V/V

• 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 ⁰C internal temperature sensor

• Precise excitation voltage and current sources

• 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 7.5 kV HBM ESD and IEC61000-4-5 2 kV surge protection

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

• 160 mW low-power consumption

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

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

3 Applications

• Data acquisition system

• PLC, DCS I/O modules

• Industrial automation and process control