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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Microchip Technology MCP3422A3-E/SN

Name: MCP3422A3-E/SN
Brand: Microchip Technology
SKU: MCP3422A3-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3422A3-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MCP3422A3-E/SN.pdf

Description:: IC ADC 18BIT SIGMA-DELTA 8SOIC

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Product details

Overview

MCP3422A3-E/SN from Microchip Technology is a 18-bit ΔΣ analog-to-digital converter with two differential input channels, on-board 2.048V ±0.05% voltage reference, programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting standard/fast/high-speed modes. It delivers 3.75 SPS at 18-bit resolution, consumes 135 µA typical in continuous mode at 3V, and operates across –40°C to +125°C - ideal for precision bridge sensing and RTD-based temperature measurement in industrial instrumentation.

For engineers reviewing the MCP3422A3-E/SN datasheet, MCP3422A3-E/SN pinout, MCP3422A3-E/SN application, or MCP3422A3-E/SN equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Microchip's DS22088C datasheet and package documentation.

Technical Context

The MCP3422A3-E/SN implements a delta-sigma modulation architecture with integrated self-calibrating offset/gain correction per conversion, eliminating need for external calibration. Its switched-capacitor front-end uses a 3.2 pF sampling capacitor and supports differential or single-ended inputs per channel, with input impedance scaling inversely with PGA gain (e.g., 2.25 MΩ at x1, 281 kΩ at x8).

It integrates an on-board oscillator and 2.048V reference (15 ppm/°C drift), enabling ±2.048V full-scale differential input range (4.096V FSR) when PGA = 1. Conversion modes include one-shot (36 µA standby) and continuous (135 µA at 3V), with data rates selectable via I²C configuration bits - no external clock required.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit (3.75 SPS), 16-bit (15 SPS), 14-bit (60 SPS), 12-bit (240 SPS) - selectable per conversion; higher bit depth enables sub-µV-level voltage resolution in low-noise systems.
Differential Input Range	±2.048V / PGA - defines maximum measurable signal swing before saturation; e.g., ±256 mV at PGA=8, critical for low-level sensor outputs.
INL Error	10 ppm of full scale (typical) - translates to ±0.42 mV error over ±2.048V range at PGA=1, ensuring high linearity in precision metrology.
Supply Voltage	2.7V to 5.5V - supports battery-powered and industrial rail voltages; internal POR resets at ~2.2V with 200 mV hysteresis.
I²C Interface	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - factory-programmed address eliminates external address pins; compatible with legacy and high-throughput controllers.
Operating Temp	–40°C to +125°C - qualified for under-hood automotive, factory automation, and harsh-environment embedded systems.
Current Consumption	135 µA typ. (3V, continuous); 36 µA typ. (3V, one-shot @ 1 SPS) - enables multi-year battery life in portable instrumentation.

Pinout & Package

The MCP3422A3-E/SN is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), pin-compatible with MSOP and DFN variants. Thermal resistance θ_JA is 149.5°C/W, requiring minimal PCB copper area for thermal management in compact designs.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Positive differential analog input, Channel 1	Accepts high-impedance sensor signals; must be paired with CH1− for true differential operation or referenced to VSS for single-ended use.
CH1−	Negative differential analog input, Channel 1	Completes differential pair; common-mode voltage must stay within VSS–0.3V to VDD+0.3V to avoid ESD diode conduction.
CH2+	Positive differential analog input, Channel 2	Enables dual-channel synchronous sampling; shares same PGA and reference as CH1, supporting ratiometric measurements.
CH2−	Negative differential analog input, Channel 2	Provides second independent differential path; input impedance scales with PGA setting (e.g., 2.25 MΩ at x1).
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP pad is internally tied to VSS and requires soldering to PCB ground for thermal and noise performance.
VDD	Positive supply (2.7–5.5V)	Requires 0.1 µF ceramic + 10 µF tantalum decoupling; power-on-reset activates at ~2.2V with built-in hysteresis.
SDA	I²C bidirectional data line	Open-drain output; needs pull-up resistor (5–10 kΩ for standard/fast mode); transmits 18-bit two's complement codes MSB-first.
SCL	I²C serial clock input	Open-drain input; accepts external clock up to 3.4 MHz; rising edge latches input, falling edge drives output.

Key Features

Feature	Design Value
On-board 2.048V reference	±0.05% initial accuracy and 15 ppm/°C drift - eliminates external reference IC, reduces BOM count, and ensures stable full-scale range across temperature.
Self-calibration per conversion	Automatic offset and gain correction - removes need for system-level calibration routines and maintains accuracy over supply/temperature variations.
Programmable gain amplifier	Gains of x1, x2, x4, x8 - enables direct digitization of microvolt-level signals (e.g., thermocouple outputs) without external op-amp stages.
Low-noise performance	1.5 µV_RMS output noise at 3.75 SPS - supports <1 µV resolution in high-precision weigh scales and strain gauge interfaces.
One-shot conversion mode	36 µA typical supply current at 3V - extends battery life in intermittent-sampling applications like handheld multimeters and portable data loggers.

Applications

Temperature Sensing	Bridge-Based Pressure Sensing
Use Scenario: Measuring resistance changes in Pt100 RTDs using constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Dual-channel differential ADC digitizes both RTD voltage and reference voltage simultaneously for drift-free ratio calculation. Use Value: 18-bit resolution and on-board 2.048V reference enable 0.01°C temperature resolution over –40°C to +125°C industrial range.	Use Scenario: Reading output of Wheatstone bridge pressure transducers in HVAC and process control systems. IC Role / Device Role / Timing Role: High-impedance differential inputs acquire mV-level bridge outputs; PGA gain x8 amplifies weak signals before digitization. Use Value: 10 ppm INL and self-calibration ensure <0.1% FS accuracy over temperature, meeting ANSI/ISA-71.04 G2 corrosion-class requirements.
Weigh Scale Front-End	Battery Fuel Gauging
Use Scenario: Converting millivolt outputs from load cell arrays in commercial weighing platforms. IC Role / Device Role / Timing Role: Low-noise ΔΣ architecture rejects 50/60 Hz line interference; one-shot mode minimizes average current draw during idle periods. Use Value: 1.5 µV_RMS noise at 3.75 SPS enables 100,000-count readability with <1 µV effective resolution in Class III legal-for-trade systems.	Use Scenario: Monitoring cell voltage and current sense shunt in lithium-ion battery packs for state-of-charge estimation. IC Role / Device Role / Timing Role: Simultaneous sampling of voltage (CH1+) and shunt voltage (CH2+) enables precise coulomb counting with matched timing. Use Value: Factory-programmed I²C address simplifies multi-cell monitoring without address conflicts; 2.7–5.5V supply matches battery voltage range.

Temperature Sensing

Bridge-Based Pressure Sensing

Use Scenario: Measuring resistance changes in Pt100 RTDs using constant-current excitation and ratiometric ADC conversion.

IC Role / Device Role / Timing Role: Dual-channel differential ADC digitizes both RTD voltage and reference voltage simultaneously for drift-free ratio calculation.

Use Value: 18-bit resolution and on-board 2.048V reference enable 0.01°C temperature resolution over –40°C to +125°C industrial range.

Use Scenario: Reading output of Wheatstone bridge pressure transducers in HVAC and process control systems.

IC Role / Device Role / Timing Role: High-impedance differential inputs acquire mV-level bridge outputs; PGA gain x8 amplifies weak signals before digitization.

Use Value: 10 ppm INL and self-calibration ensure <0.1% FS accuracy over temperature, meeting ANSI/ISA-71.04 G2 corrosion-class requirements.

Weigh Scale Front-End

Battery Fuel Gauging

Use Scenario: Converting millivolt outputs from load cell arrays in commercial weighing platforms.

IC Role / Device Role / Timing Role: Low-noise ΔΣ architecture rejects 50/60 Hz line interference; one-shot mode minimizes average current draw during idle periods.

Use Value: 1.5 µV_RMS noise at 3.75 SPS enables 100,000-count readability with <1 µV effective resolution in Class III legal-for-trade systems.

Use Scenario: Monitoring cell voltage and current sense shunt in lithium-ion battery packs for state-of-charge estimation.

IC Role / Device Role / Timing Role: Simultaneous sampling of voltage (CH1+) and shunt voltage (CH2+) enables precise coulomb counting with matched timing.

Use Value: Factory-programmed I²C address simplifies multi-cell monitoring without address conflicts; 2.7–5.5V supply matches battery voltage range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit delta-sigma ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS1120IPWR (Texas Instruments)	4-channel, SPI interface, integrated PGA and reference; no factory-set I²C address; higher 1.8V min supply.	Requires SPI host and level-shifting for 1.8V logic; better suited for space-constrained PCBs needing >2 channels.	Select if multi-channel expansion or SPI-native host is preferred; verify 1.8V compatibility in low-voltage systems.
MCP3426-E/SN (Microchip)	Same pinout and feature set, but factory-configured for I²C address 0x68 (MCP3422A3-E/SN = 0x69); identical electrical specs.	No functional difference - used where multiple MCP342x devices share same I²C bus with distinct addresses.	Choose for I²C bus arbitration in multi-ADC systems; no layout or firmware change needed beyond address register update.

Compared with ADS1120IPWR and MCP3426-E/SN, the MCP3422A3-E/SN offers guaranteed I²C address uniqueness out-of-box, lower minimum supply (2.7V), and seamless drop-in replacement for existing MCP3422 designs - making it optimal for cost-sensitive, dual-channel, battery-operated instrumentation.

Availability

MCP3422A3-E/SN is available at Aetrix Electronics and suitable for precision temperature sensing, industrial bridge measurement, and battery fuel gauging requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for MCP3422A3-E/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software.

The MCP342X series was designed specifically for high-accuracy, low-power, multi-channel analog sensing in space- and power-constrained embedded systems - emphasizing integrated references, self-calibration, and robust I²C interoperability.

FAQ

What is the factory-programmed I²C address of the MCP3422A3-E/SN?

The MCP3422A3-E/SN has a fixed I²C slave address of 0x69 (binary 1101001), determined by the 'A3' suffix per Microchip's addressing scheme. This eliminates external address pin routing and prevents bus conflicts when multiple MCP3422 devices operate on the same I²C bus. The address is hard-coded during manufacturing and cannot be altered in-circuit. Always confirm address usage in your firmware initialization sequence to avoid communication failures with the MCP3422A3-E/SN.

Does the MCP3422A3-E/SN require external calibration for production use?

No, the MCP3422A3-E/SN performs automatic self-calibration of offset and gain before each conversion, as specified in DS22088C. This eliminates the need for external calibration hardware or firmware routines. The on-board 2.048V reference (±0.05% initial accuracy, 15 ppm/°C drift) and PGA contribute to total system accuracy without user intervention. Calibration is fully transparent and occurs internally - a key advantage for field-deployed MCP3422A3-E/SN systems requiring long-term stability.

Can the MCP3422A3-E/SN measure single-ended signals?

Yes, the MCP3422A3-E/SN supports single-ended operation by connecting the CHn− pin to VSS (ground) while applying the signal to CHn+. For example, CH1− to VSS and CH1+ to the signal source configures Channel 1 as single-ended. However, differential mode is strongly recommended for noise rejection and common-mode error cancellation. Single-ended use reduces effective resolution due to increased susceptibility to ground bounce and EMI, and must respect absolute input limits (VSS–0.3V to VDD+0.3V) on both pins - even when CHn− is tied to VSS.

What is the maximum input source impedance supported by the MCP3422A3-E/SN?

The MCP3422A3-E/SN's differential input impedance is 2.25 MΩ / PGA (e.g., 2.25 MΩ at x1, 281 kΩ at x8), based on its 3.2 pF sampling capacitor and internal switching frequency. To maintain specified INL (<10 ppm) and offset accuracy, the external source impedance should be ≤1 kΩ - especially at higher PGA gains. Higher source impedances increase settling time and introduce gain/offset errors; Microchip recommends buffering high-Z sources (e.g., thermistors) with a low-output-impedance op-amp before connecting to the MCP3422A3-E/SN inputs.

How does the MCP3422A3-E/SN handle overvoltage conditions on analog inputs?

The MCP3422A3-E/SN includes ESD protection diodes on all analog pins (CH1±, CH2±), rated for ≥6 kV HBM. If input voltage exceeds VSS–0.3V or VDD+0.3V, these diodes conduct, causing leakage current that may saturate the ADC output (all 0s or all 1s) or induce measurement errors. Permanent damage can occur with sustained overvoltage. Microchip specifies strict adherence to the absolute maximum ratings - external clamping (e.g., TVS diodes) or resistive limiting is required for field-reliable MCP3422A3-E/SN deployments in electrically noisy environments.

MCP3422A3-E/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Number of Bits:: 18

Sampling Rate (Per Second):: 3.75

Number of Inputs:: 2

Input Type:: Differential

Data Interface:: I2C

Configuration:: MUX-PGA-ADC

Ratio - S/H:ADC:: -

Number of A/D Converters:: 1

Architecture:: Sigma-Delta

Reference Type:: Internal

Voltage - Supply, Analog:: 2.7V ~ 5.5V

Voltage - Supply, Digital:: 2.7V ~ 5.5V

Features:: PGA

Operating Temperature:: -40°C ~ 125°C

Supplier Device Package:: 8-SOIC

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MCP3422A3-E/SN FAQ

1.How can I place an order for MCP3422A3-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3422A3-E/SN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MCP3422A3-E/SN reliable?

The price and inventory of MCP3422A3-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3422A3-E/SN is usually 5 days.

3.What payment methods are accepted for MCP3422A3-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A3-E/SN transactions.

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4.How is shipping managed for MCP3422A3-E/SN?

MCP3422A3-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3422A3-E/SN order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MCP3422A3-E/SN?

For technical support, including MCP3422A3-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A3-E/SN requirements.

6.How does Aetrix verify that MCP3422A3-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3422A3-E/SN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP3422A3-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3422A3-E/SN?

All MCP3422A3-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A3-E/SN, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MCP3422A3-E/SN part is unused and in its original packaging.

Return procedure for MCP3422A3-E/SN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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