Naxin Microelectronics Launches Multi-Channel 24/16-Bit Δ-Σ ADCs with Capacitive PGA

Naxin Microelectronics recently launched the NSAD124x and NSAD114x series of multi-channel 24/16-bit low-power, high-precision Δ-Σ ADCs, designed to meet the high-accuracy temperature measurement needs in industrial applications. Featuring an integral non-linearity of 3 ppm and effective resolutions up to 23.4 bits, these devices are ideal for thermocouple measurement, multi-wire RTD, thermistors, and resistance bridge sensors. They provide high-precision, stable temperature measurement solutions for factory automation and complex process control systems.
The NSAD124x and NSAD114x series can integrate up to 12 analog input channels and include an on-chip reference source, oscillator, and dual matched current sources. Their specially designed digital filters allow for low-latency conversion while effectively suppressing 50 Hz and 60 Hz power line interference. Additionally, these devices feature sensor burnout detection, thermocouple bias voltage adjustment, a reference monitor, output-to-rail detection circuits for the PGA, an integrated temperature sensor, and up to eight GPIO interfaces, ensuring reliable and safe operation of temperature measurement systems.
Integration of High-Precision, Low-Drift Signal Chain Modules for Industrial Automation
In RTD/TC temperature acquisition applications for industrial automation, Naxin Micro's NSAD series products integrate all necessary modules into a single chip solution. This includes a programmable gain amplifier (PGA), high-precision reference source, matched current sources (IDAC), and various self-calibration mechanisms, providing comprehensive support for high-precision temperature measurement needs in industrial automation.
The IDAC integrates two independent current sources adjustable from 10 μA to 2000 μA with a 0.1% matching accuracy. The on-chip reference provides a 2.048V output with 0.02% initial accuracy and 3 ppm/°C temperature drift. The integrated 4.096 MHz clock maintains 1% accuracy across the full temperature range. The capacitive PGA supports gains from 1 to 128 while allowing any common-mode input range at all gain settings. The ADC achieves an effective resolution of up to 23.4 bits, and the integrated temperature sensor provides ±1.5°C accuracy across the temperature range.
Low Latency and Power Frequency Suppression Filters for Rapid Establishment
The NSAD series features specially designed low-latency filters that enable rapid establishment in a single cycle, catering to the need for fast switching between multiple channels. Moreover, these filters effectively suppress 50 Hz and 60 Hz power line interference, with two deep notch points for each frequency. For instance, at an output rate of 20 Hz, the series maintains sufficient suppression depth even with frequency deviations of ±1 Hz, ensuring precise measurement amidst power line noise.
Innovative Capacitive PGA Design for Enhanced Flexibility
In weak signal acquisition scenarios, it is often necessary to maximize gain for full-scale conversion results. Traditional resistor-based PGA input stages may require trade-offs between common-mode input range and gain, often necessitating additional bias voltage sources or resistors. The NSAD series uses a capacitive PGA design that maintains a rail-to-rail common-mode input range regardless of gain settings (1 to 128), allowing for flexible common-mode voltage biasing between positive and negative supply rails. This significantly enhances the flexibility and precision of weak signal acquisition.
Diverse Internal Resources to Meet Various Application Needs
The NSAD124x and NSAD114x series provide a rich selection of internal resources, including the number of analog input channels, reference channels, IDAC current sources, and GPIO ports. Additionally, these devices are available in various package options such as TSSOP28, TSSOP20, and TSSOP16, making them adaptable to different application requirements.