EmbeddedRelated.com
    Parts   Interface ICs  ADC & DAC    Microchip MCP3xxx ADC Family    MCP3421A0T    MCP3421A0T-E/CH
MCP3421A0T-E/CH

MCHPMCP3421A0T-E/CH

Microchip Technology
18 Bit Analog to Digital Converter 1 Input 1 Sigma-Delta SOT-23-6
Active23,233 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The MCP3421 is a single-channel, 18-bit delta-sigma ADC featuring a differential input and an integrated voltage reference. Its small SOT-23-6 package and I2C interface make it an efficient solution for high-resolution sensing in space-constrained designs.

Why Choose This Part

The MCP3421 eliminates the need for external components by integrating a voltage reference, oscillator, and PGA into a tiny footprint. It offers excellent power efficiency with a sleep current of approximately 0.1uA and supports wide supply voltages from 2.7V to 5.5V.

Applications

Portable Instrumentation
Ideal for handheld measurement devices where high resolution and low power consumption (0.145mA continuous) are critical.
Battery Current Monitoring
Utilizes the differential input and internal PGA to measure small voltage drops across shunt resistors for precise battery fuel gauging.
Weigh Scales
The 18-bit resolution and self-calibration of internal offset and gain support accurate measurements from load cell bridges.
Temperature Sensing
Suitable for high-accuracy RTD or thermocouple measurements when paired with the internal programmable gain amplifier.

Key Specifications

Features PGA
Input Type Differential
Architecture Sigma-Delta
Configuration PGA-ADC
Mounting Type Surface Mount
Data Interface I2C
Number of Bits 18
Package / Case SOT-23-6
Reference Type Internal
Number of Inputs 1
Operating Temperature -40degC ~ 125degC
Supplier Device Package SOT-23-6
Number of A/D Converters 1
Voltage - Supply, Analog 2.7V ~ 5.5V
Voltage - Supply, Digital 2.7V ~ 5.5V
Sampling Rate (Per Second) 3.75

Getting Started

Communication is handled via a standard I2C interface, requiring only two pull-up resistors on the SDA and SCL lines. Engineers can choose between one-shot mode for power savings or continuous conversion mode for real-time monitoring.

Also Consider

ADS1115 TITexas Instruments - Offers 4 single-ended or 2 differential channels at 16-bit resolution for multi-sensor applications.
MCP3424 MCHPMicrochip Technology - Provides four differential input channels for systems requiring the same 18-bit architecture in a single package.

Categories

Interface ICs > ADC & DAC