Analog front-end IC (NA2202/2203/2204) that neatly organizes the area around the sensor

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Product Pickup Analog Nisshinbo Micro Devices

Analog circuit engineers, are you having trouble with the following issues?
・There are few engineers with extensive knowledge of analog circuits, so it is difficult to prepare a development environment on your own
- Want to reduce evaluation man-hours by using digital correction rather than analog circuits
- The current analog circuitry is an old design, so there are concerns about supply and support...

This time, we will introduce the Nisshinbo Micro Devices AFE NA2202/2203/2204, which can solve such problems. Please read on.

4 features

1.High compatibility

We offer 16-bit (NA2202), 20-bit (NA2203), and 24-bit (NA2204) resolutions, and each product is pin-compatible,
It is now possible to use the same board to match the system's resolution requirements, reducing development time and increasing system flexibility.
All three products use the QFN4040-24-N package (pin compatible/foot pattern compatible)

*Extracted from Nisshinbo Micro's data sheet

2. High operability (easy-to-use digital correction function)

Digital correction function eliminates the need for complex analog correction circuit adjustments! Digital correction function eliminates the need for complex analog correction circuit adjustments!
The NA2202/2203/2204 has registers (datasheet P11-P23) that can be accessed through the SPI bus. Registers with different data lengths (2-3 bytes) are assigned to the 4-bit register address (0x0-0xF).
*Please refer to the register description table
・Offset correction: No need for an offset correction circuit using an op-amp → Just send one command from the MCU (Zero Point Adjustment)
・Gain correction: No need for op-amp-based gain correction circuit → Just send one command from the MCU (System Gain Adjustmet)

3.High integration (integration of external components onto one chip)

Equipped with a maximum 128x PGA and multiplexer in a QFN4040 (4mm x 4mm) package!
・The built-in multiplexer contributes to miniaturization of applications! (①)
In addition, various input configurations are possible depending on the application! (8 channel single-ended, 4 channel differential input, 4 channel pseudo differential input)
- Two built-in excitation current sources contribute to reducing the number of parts and saving space! (②)
- First stage ~ 32x PGA (③), next stage ~ 4x PGA (③') built-in, contributes to space saving by reducing external op amps and resistors x4pcs+α!

4.Safe design (with error detection function)

Equipped with a function to detect disconnection of sensors (such as thermocouples) Equipped with a function to detect disconnection of sensors (such as thermocouples) Normally, the ADC output is within the normal range, but if a disconnection occurs in the sensor circuit, the ADC output sticks to full scale, allowing the disconnection to be detected.