MCP3424T-E/SL

Number of A/D Converters:	1
Base Part Number:	MCP3424
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°C
Features:	PGA, Selectable Address
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:	4
Sampling Rate (Per Second):	3.75
Number of Bits:	18
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Data Acquisition - Analog to Digital Converters (ADC)

Analog to Digital Converters (ADCs) are important devices in data acquisition systems, providing an interface from the world of analog signals to the world of digital signals. The MCP3424T-E/SL is one of the advanced ADCs available, boasting features such as 16-bit resolution and both I2C and SPI communication interfaces. This article explains the application field of the MCP3424T-E/SL, as well as its working principle.

Application Field

The MCP3424T-E/SL ADC is a low power, 16-bit device, designed for applications that require high resolution data acquisition. It provides an interface between the analog and digital worlds that is suitable for measurements in industrial control, medical monitoring, and instrumentation systems. Additionally, this device offers a wide operating voltage range, making it suitable for use in embedded industrial applications. Its low power design, and its small packaging options (SOIC-8, TSSOP-8, and MSOP-10) are advantageous in mobile and portables systems. In addition, it can be driven with both I2C and SPI communications interfaces, giving it a wide range of flexibility in system design.

Working Principle

The MCP3424T-E/SL operates through a successive approximation register (SAR) and uses a three-step process for data acquisition. The first step involves setting the configuration registers to specify the desired sampling rate. The second step consists of setting the Multiplexer (MUX) to select the appropriate input and configuring the Analog to Digital converter (ADC) channels. Lastly, the conversion is triggered and the acquired data is transferred to the output register. The successive approximation register works through a two-step process. The first step is the sampling step, which samples the incoming analog signals and stores them in the SAR. The second step is the conversion step, in which the SAR is updated to the new digital output. 3-bit words of the SAR are added or subtracted until the analog input value is matched to the digital output value. Once the conversion is complete, the MCP3424T-E/SL applies signal-to-noise ratio (SNR) and offset adjustments to the feedback loop in order to further reduce noise and provide higher accuracy readings. The results are then transferred to the output registers for conversion to digital values.

Conclusion

The MCP3424T-E/SL ADC is an ideal choice for high-resolution, low-power applications due to its wide operating voltage range, low power design, and small packaging options. Furthermore, its dual I2C/SPI communication interface provides a great deal of flexibility in system design. By applying its three-step, successive approximation register driven process, it is able to accurately convert analog signals into digital values.

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