NA2203NBAE2S

Analog Front End (AFE) Overview

The NA2203NBAE2S is a CMOS-based Analog Front End (AFE) integrating a 20-bit Delta-Sigma ADC and dual Programmable Gain Amplifiers (PGA1, PGA2). It supports analog supply voltages from +2.7V to +5.5V (unipolar) or ±2.5V (bipolar), enabling negative voltage input for sensors like thermocouples. The device offers a data rate of 3.125 to 9.6 ksps in continuous mode, with PGA gains ranging from 1V/V to 128V/V. Key features include built-in 2.048V reference, internal oscillator, system calibration for offset/gain drift, and two matched excitation current sources. Error detection via CRC8 or Check Sum ensures data integrity.

Analog Front End (AFE) Feature Summary

• 20-bit resolution ADC with no missing codes
• Dual PGA supporting total gain up to 128x (PGA1: 1-32V/V, PGA2: 1-4V/V)
• Built-in excitation current sources (0.1mA, 0.25mA, 0.5mA, 1.0mA) with <1% matching error
• SPI interface with CRC8/Check Sum error detection

Analog Front End (AFE) Applications

• Temperature controllers
• Pressure sensors
• Flowmeters
• PLC systems
• Digital panel meters

Analog Front End (AFE) Procurement Notes

Verify the ordering suffix 'NB' corresponds to the QFN4040-24-NB package and 'AE2S' indicates the specific packing and quality grade. Confirm RoHS compliance and halogen-free status as specified in the order information table. Ensure the application environment operates within the -40°C to +125°C temperature range.

Analog Front End (AFE) Selection Notes

Select this model over NA2202 or NA2204 when a 20-bit resolution is required. Note that PGA1 cannot be used for single-ended inputs; only PGA2 is available for the eight single-ended channels. Consider the low power mode if energy consumption is critical, as it reduces analog current to ~0.9mA but lowers the data rate to 1/4 of normal operation.

Analog Front End (AFE) Part Context

This component belongs to the NA2202/2203/2204 series of high-precision AFEs from Nisshinbo Micro Devices. The series shares identical pinouts, interfaces, and core architectures, differing primarily in ADC resolution (16-bit for NA2202, 20-bit for NA2203, and 24-bit for NA2204). All variants support bipolar analog supplies and feature integrated signal conditioning capabilities.

Analog Front End (AFE) Replacement Considerations

NA2202NBAE2S and NA2204NBAE2S are direct pin-compatible alternatives within the same family, offering 16-bit and 24-bit resolutions respectively. No other cross-model substitutes are documented.