MCP3426A0T-E/MS

Analog To Digital Converters (ADC) Overview

The MCP3426A0T-E/MS is a 16-bit Delta-Sigma analog-to-digital converter (ADC) featuring two differential input channels and an I²C serial interface. It integrates an internal 2.048V voltage reference, a programmable gain amplifier (PGA) with gains of 1, 2, 4, or 8, and an on-board oscillator. The device supports data rates of 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit). Operating from a single 2.7V to 5.5V supply, it performs self-calibration of offset and gain for each conversion. The 'T' suffix indicates tape and reel packaging, while 'MS' denotes the MSOP package.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with differential inputs and integrated PGA (x1, x2, x4, x8)
• Internal 2.048V voltage reference with ±0.05% accuracy
• I²C interface supporting Standard (100 kHz), Fast (400 kHz), and High Speed (3.4 MHz) modes
• Low power consumption: 135 µA typical in continuous mode; <1 µA in standby

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 applications
• Weigh scales and battery fuel gauges

Analog To Digital Converters (ADC) Procurement Notes

Verify that the ordering suffix matches the required configuration. The 'T' suffix specifies tape and reel packaging, distinct from tube packaging. The 'MS' suffix identifies the MSOP package type. Confirm that the factory-programmed I²C address aligns with system requirements, as the MCP3426 lacks external address selection pins unlike the MCP3427/8 variants.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high accuracy with minimal external components due to the integrated reference and PGA. Ensure the source impedance is low enough to charge the internal sampling capacitor effectively. Verify that the I²C bus speed (Standard, Fast, or High Speed) is compatible with the master controller. Consider the thermal resistance of the MSOP package if operating at elevated temperatures.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MCP3426/7/8 family of multi-channel ΔΣ ADCs. The MCP3426 specifically offers two differential channels with a fixed factory-programmed I²C address. It shares electrical characteristics with the MCP3427 and MCP3428 but differs in channel count and address configurability. The device is designed for precision measurement tasks where low noise and high linearity are critical.

Analog To Digital Converters (ADC) Replacement Considerations

MCP3426A0-E/MS (Tube Packaging): Identical electrical specifications and functionality; differs only in shipping packaging format (tube vs. tape and reel).

Analog To Digital Converters (ADC) FAQ

How does the MCP3426 handle input voltage ranges?

The differential input full-scale range is determined by the internal reference voltage (2.048V) divided by the PGA gain setting. The absolute maximum input voltage on any pin must remain within VSS-0.3V to VDD+0.3V to prevent ESD diode conduction.

What is the difference between One-Shot and Continuous conversion modes?

In Continuous mode, the device converts inputs continuously at the configured rate. In One-Shot mode, it performs a single conversion and automatically enters a low-power standby mode until a new conversion command is received via the I²C interface.

Does the MCP3426 support external I²C address configuration?

No, the MCP3426 has its I²C address bits programmed at the factory during production. External address selection pins (Adr0 and Adr1) are available only on the MCP3427 and MCP3428 models.