MCP3422A0T-E/MS

Number of A/D Converters:	1
Base Part Number:	MCP3422A0
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 125°C
Features:	PGA
Voltage - Supply, Digital:	2.7 V ~ 5.5 V
Voltage - Supply, Analog:	2.7 V ~ 5.5 V
Reference Type:	Internal
Architecture:	Sigma-Delta
Series:	--
Ratio - S/H:ADC:	--
Configuration:	MUX-PGA-ADC
Data Interface:	I²C
Input Type:	Differential
Number of Inputs:	2
Sampling Rate (Per Second):	3.75
Number of Bits:	18
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MCP3422A0T-E/MS (hereafter referred to as MCP3422) is an ultra-low power, single channel, 16-bit parallel output analog-to-digital converter. It is optimized for use as a bridge-type load cell signal conditioning device but can be used for other sensor applications. It provides a built-in 8-bit signal conditioning amplifier and includes a temperature sensor for environmental compensation. The on-chip voltage reference, ADC, and temperature sensors make the MCP3422 a single device solution for sensing a wide range of biological, environmental, and industrial applications.The MCP3422 offers several advantages over traditional bridge-type signal conditioning solutions. It is a low-cost and low-power solution that can be integrated into low power or battery supply systems. It can measure differential voltages up to ±3.3V and provides 16-bit resolution without having to compromise on accuracy. It also features an adjustable gain of 1x to 8x and a flexible temperature compensation range of -22°C to +85°C.

Data Acquisition - Analog to Digital Converters (ADC)

Analog-to-digital converters (ADC) are electronic devices that convert an analog signal, such as a sound or temperature, into a digital representation. The MCP3422 is a low cost, 16-bit ADC designed to convert bridge-type load cell signals into digital information. It features an 8-bit programmable gain amplifier and temperature sensor for environmental compensation.The MCP3422 can measure differential voltages up to ±3.3V, and it features an adjustable gain of 1x to 8x and a temperature compensation range of -22°C to +85°C. The on-chip reference and ADC makes the MCP3422 a single device solution for sensing a wide range of biological, environmental, and industrial applications.

Application Field

MCP3422 is primarily used for bridge-type load cell signal conditioning applications. These applications include bridge-type load cells for weight measurement, pressure measurements, velocity measurements and position sensors. Its flexible output mode, 16-bit resolution, low noise, and high accuracy make MCP3422 a good choice for general purpose sensor applications.MCP3422 is also suitable for industrial automation and control applications where accurate, low-power, and low-cost analog-to-digital conversion is needed. Its adjustable gain and temperature compensation, together with its 16-bit resolution, make it suitable for a variety of industrial applications including automotive, HVAC, metrology, calorimetry, and medical instrumentation.

Working Principle

MCP3422 relies on voltage reference with an internal 16-bit ADC to convert the input analog signal into a digital word. The input is applied to the bridge-type load cell, which is amplified by the preamplifier. The preamplifier output is then buffered and applied to the Voltage Reference and the ADC.The Voltage Reference is used to set the full-scale range of the ADC and provides an offset of the output. The analog signal is converted and rectified on the ADC and the result is then clocked into the data register. The output of the data register is a 16-bit digital word.MCP3422 also has a temperature sensor to provide temperature compensation for the bridge voltage in order to reduce measurement errors. The temperature sensor is provided to monitor the temperature of the load cell over its expected operating range.

Conclusion

MCP3422 is an ultra-low power, single channel, 16-bit parallel-output analog-to-digital converter. It is designed for bridge-type load cell signal conditioning. It is a low cost and low-power solution with the ability to convert differential voltages up to ±3.3V and provide 16-bit resolution without compromising accuracy. It also features an adjustable gain of 1x to 8x and a temperature compensation range of -22°C to +85°C. It is suitable for a wide variety of applications, including industrial automation and control, as well as biological, environmental, and medical instrumentation.

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