Nuvoton – NAU7802 Precision ADC

Nuvoton – NAU7802 Precision ADC: The Nuvoton NAU7802 is a precise 24-bit sigma-delta ADC with an integrated, low-noise, and programmable amplifier that enables high-performance and cost-efficient signal evaluation of sensor bridges used in load cells or strain gauges.

Nuvoton Technology is a globally operating semiconductor manufacturer with its roots Winbond, with a clear focus on innovative mixed-signal solutions for audio, microcontrollers, cloud security, and industrial applications.

With in-house fabs and global branches, Nuvoton provides powerful yet cost-optimized ICs for markets such as automotive, industrial, communication, and consumer electronics.

The NAU7802 complements this portfolio by offering high-resolution measurements with low power consumption and minimal external component requirements.

Nuvoton – NAU7802 Precision ADC at a glance

The key features of the NAU7802 can be summarized as follows:

• Inputs and PGA:
  • Two differential input pairs (VIN1P/N, VIN2P/N) with input multiplexer.
  • Programmable gains from x1 to x128.
  • PGA bypass mode for input signals approaching AVDD/AVSS.
  • High-impedance inputs (typically 5 GΩ).
• Reference and power supply:
  • Differential reference input via REFP/REFN with a typical range of 0.1 V to 5 V.
  • Integrated AVDD LDO with programmable output voltage (e.g., 2.4–4.5 V) and sufficient current to power typical sensor bridges.
• Clock and auxiliary functions:
  • Internal trimmed RC oscillator (4.9152 MHz) as default.
  • Option for external crystal or oscillator; system clock can be output via DRDY pin if needed.
  • Integrated temperature sensor for system or offset/gain drift compensation.
• Calibration and digital functions:
  • Internal and external offset/gain calibration per channel, including status and error flags.
  • I²C-compatible 2-wire interface up to 400 kHz, with selectable internal pull-ups.
  • Standard register access and 2 streaming modes for efficient data transfer to the host processor.

Target Applications for NAU7802

Thanks to its feature set, the NAU7802 is ideal for precise force and weight measurement with strain gauges – for example, in table and platform scales, dosing systems, and test benches. Industrial and process measurement applications, such as level, flow, and pressure sensors, also benefit from it where low bandwidth is sufficient but high resolution is required.
Typical use cases include:

• Voltage monitoring applications, such as long-term drift observation, reference qualification, or precise supply voltage control.
• Energy metering systems where currents or voltages must be measured with high resolution and integrated over long periods – e.g., in battery-powered data loggers, smart energy devices, or IoT nodes focusing on energy monitoring and optimization.

The combination of high resolution, integrated sensor power supply, efficient power management, and I²C interface makes it easy to implement compact, energy-efficient measurement and monitoring solutions in all these scenarios.

Talk to us about the requirements of your upcoming measurement project. We are happy to help you find the right solution. Contact us directly regarding the Nuvoton – NAU7802 Precision ADC by phone or send us your inquiry online here