Highly Configurable 8 Channel ±25 V Universal Input Analog Front-End

NAFEx1388

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The NAFE11388 / NAFE11348 / NAFE71388 is a highly configurable industrial-grade 8 channel universal input analog front-end (AFE) family that meets high precision measurement requirements. The device integrates low-leakage high-voltage fast multiplexers, low offset and low drift PGA and buffers, precision and high data-rate 16 / 24-bit delta-sigma ADC and a low-drift voltage reference. The analog high voltage (HV) input pins are diode-protected internally for EMC and miswiring scenarios. This device 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 NAFE11388 / NAFE11348 are dedicated to low power applications while the NAFE71388 supports high speed data rate up to 576 kSPS.

The NAFE11388 / NAFE11348 and NAFE71388 are designed for programmable logic controllers (PLC), I/O modules, data loggers, instrumentation and high precision sensor and data acquisition systems.

For additional information and sample availability, contact your local Sales Office.

Block Diagram

NAFE11388 / NAFE11348 / NAFE71388 Analog Front-End

NAFE11388 Block Diagram
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Features

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

  • NAFE11388 / NAFE11348: 7.5 SPS to 288 kSPS
  • NAFE71388: 15 SPS to 576 kSPS
  • Simultaneous 50 Hz/60 Hz line rejection
  • ENOB:
    • NAFE11388: 17-bit at 72 kSPS / 24-bit at 30 SPS
    • NAFE11348: 16-bit at 72 kSPS / 16-bit at 30 SPS
    • NAFE71388: 17-bit at 144 kSPS / 24-bit at 50 SPS

High Accuracy

  • 0.005 % FS accuracy at room after user calibration
  • 0.1 % FS accuracy over -25 ⁰C to 105 ⁰C

System Calibration

  • End-to-end calibration with integrated precise voltage sources
  • Accurate factory-calibrated products available

Key Features

  • ±3 ⁰C 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
  • Power Consumption: 125 mW for low power version and 135mW for the high speed
  • Operating temperature range TA: -40 ⁰C to +125 ⁰C
  • Package: 64 pin, 9 mm x 9 mm x 0.85 mm HVQFN

Product Longevity Program

  • These products are included in the NXP Product Longevity program ensuring a stable supply of products for 15 years for your embedded designs.

Part numbers include: NAFE11348B40BS, NAFE11388B40BS, NAFE71388B40BS.

Comparison Table

Low Power/ High Speed Factory Calibration ADC Resolution Channels Status
NAFE11388 Low Power Yes 24 bits 8 Available
NAFE71388 High Speed Yes 24 bits 8 Available
NAFE11348 Low Power Yes 16 bits 8 Available

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Note: For better experience, software downloads are recommended on desktop.

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