24-Bit A-D Converter

Nisshinbo Micro Devices released the NA2202/NA2203/NA2204 series, a 5V analog front end (AFE) with high precision 16/20/24-Bit A-D converter for industrial equipment.

In recent years, the industrial equipment market has seen rapid progress in the automation of manufacturing processes to improve production efficiency, enhance quality, and compensate for labor shortages. Sensors are essential to such automation, and the demand for sensors is expected to grow. However, since the design of sensor circuits is time-consuming in terms of setting constants, the problem arises that the design time increases significantly.

The NA2202/NA2203/NA2204 series (16-bit/20-bit/24-bit) incorporates a programmable gain amplifier (PGA) of up to 128 times and a multiplexer, and multiple sensors can be used in combination. This solves the problem of increased work hours for constant adjustment. It also supports a 5 V operating, making it an ideal AFE for microcontroller-based systems. The package size of 4.0 × 4.0 × 0.75 mm^*1 contributes to system miniaturization.

*1) Corrected a part of the package dimensions. (June 19, 2024)

Product Name	NA2202/NA2203/NA2204 Series
Sample Unit Price (Reference unit price when purchasing 2000 units, tax Included *)	JPY 660/JPY 770/JPY 880
Sample Order Start Date	June 13, 2024
Monthly Production	200,000 pcs

*The price is based on the consumption tax rate as of June 2024.

Features

1. AFE with High Precision A-D Converter

The industrial equipment market often requires high-resolution measurements and uses 16-bit to 24-bit A-D converters. Since the NA2202/NA2203/NA2204 series features 16-bit (NA2202), 20-bit (NA2203), and 24-bit (NA2204) resolution, and pin-compatible with each other, the same board can be used for different system resolution requirements. This can reduce development time and increase system flexibility.
As shown in Figure 1, the NA2202/NA2203/NA2204 series offers a choice of products according to the resolution required for various systems.

Figure 1 Application Circuit Example

2. Ideal for Industrial Equipment Market Thanks to Support of 5 V (or ±2.5 V) Operating Voltage

Microcontrollers with 5 V operating voltage are still widely used in the industrial equipment market. In order to transmit sensor information as accurately as possible, AFEs must operate at the same voltage as the microcontroller. Since the NA2202/NA2203/NA2204 series supports a 5 V operation, it is an ideal AFE for microcontroller-based systems.

3. Helps Miniaturize Applications with Small Package

As shown in Figure 2, the NA2202/NA2203/NA2204 series incorporates not only a ΔΣ type A-D converter but also a PGA of up to 128 times, two excitation current systems for sensors, and a high-precision reference voltage (switchable to external supply) for the A-D converter. In addition to incorporating peripheral functions, the small package contributes to the reduction of board area and thus to the miniaturization of products.

Figure 2 Block Diagram

Product and Demonstration Board Photos

NA2202/NA2203/NA2204 Series (QFN4040-24-NB)
Demonstration Board

Please contact your distributor or the contact information below to request demonstration boards.

Main Specifications (Please refer to the datasheet for details.)

Itmes	NA2202/NA2203/NA2204 Series
Supply Voltage	Analog: +2.7 V to +5.5 V or ±2.5 V Digital: +2.7 V to +5.5 V
Current Consumption	Analog: 2.9 mA (Normal Mode), 0.9 mA (Low Power Mode) Digital: 0.3 mA
Input Mode	Differential: 4 inputs Single-ended: 8 inputs Pseudo-differential
ΔΣ type A-D converter	16-Bit, 20-Bit, 24-Bit 3.125 sps to 9.6 ksps (case of continuous conversion)
PGA	1 V/V to 128 V/V
Built-in Regulator	2.048 V ±20 mV
GPIO	4 channels (shared with input terminal)
Excitation Current Source	2 systems (0.1 mA, 0.25 mA, 0.5 mA, 1.0 mA)
50Hz/60Hz Rejection Mode	equipped
System Calibration	Offset Voltage Calibration, Gain calibration (can be executed by microcontroller command)
Burnout Detect	equipped
Interface	SPI (with CSB)
Error Detection	CRC8, Check Sum
Ambient Operating Temperature	-40°C to +125°C
Package	QFN4040-24-NB