MCP3426A0-E/SN

Analog To Digital Converters (ADC) Overview

The MCP3426A0-E/SN is a 16-bit Delta-Sigma Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It features two differential input channels and an integrated I2C serial interface supporting Standard, Fast, and High-Speed modes. The device includes an on-board 2.048V voltage reference with ±0.05% accuracy and a Programmable Gain Amplifier (PGA) offering gains of 1, 2, 4, or 8. It operates on a single supply voltage ranging from 2.7V to 5.5V and supports data rates of 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit). The component is housed in an 8-pin SOIC package and functions within an extended temperature range of -40°C to +125°C.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with differential inputs and self-calibration for offset and gain errors.
• Integrated 2.048V internal voltage reference with low drift characteristics.
• Programmable Gain Amplifier (PGA) with selectable gains of x1, x2, x4, or x8.
• I2C compatible interface with factory-programmed fixed address.

Analog To Digital Converters (ADC) Applications

• Portable instrumentation and consumer goods
• Temperature sensing using RTDs, thermistors, and thermocouples
• Bridge sensing for pressure, strain, and force measurements
• Weigh scales and battery fuel gauges

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix 'E' indicates RoHS compliance and 'SN' specifies the 8-pin SOIC package. Confirm that the 'A0' suffix denotes a factory-fixed I2C address, as this variant lacks external address selection pins found in other family members. Ensure the application circuit provides adequate decoupling capacitors near the VDD pin to maintain signal integrity during operation.

Analog To Digital Converters (ADC) Selection Notes

Select this model when a fixed I2C address is acceptable, as it differs from the MCP3427 which allows user-configurable addresses via external pins. Choose based on required resolution versus speed trade-offs: 15 SPS for maximum 16-bit precision or higher rates for lower bit depths. Ensure the input signal range fits within the ±2.048V/PGA limit provided by the internal reference.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MCP342X series of multi-channel ΔΣ ADCs. While electrically similar to the MCP3427, the MCP3426 is distinguished by its fixed I2C address programmed at the factory. It shares the same core architecture, including the 16-bit converter, PGA, and internal reference, but is limited to two differential input channels compared to the four available in the MCP3428.

Analog To Digital Converters (ADC) Replacement Considerations

MCP3426A0T-E/SN offers the same electrical specifications in a tape-and-reel packaging format suitable for automated assembly processes.

Analog To Digital Converters (ADC) FAQ

How does the MCP3426 handle input overvoltage?

If the differential input voltage exceeds the full-scale range defined by VREF/PGA, the output code saturates at all zeros or all ones (except the sign bit) rather than rolling over.

What is the purpose of the self-calibration feature?

The device performs automatic offset and gain calibration for each conversion, ensuring accurate results despite variations in temperature and power supply fluctuations.

Can the MCP3426 operate in single-ended mode?

Yes, although designed for differential inputs, the CHn- pin can be connected to VSS to enable single-ended operation for specific channel configurations.