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

Microchip Technology MCP3422A7-E/SN

Name: MCP3422A7-E/SN
Brand: Microchip Technology
SKU: MCP3422A7-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3422A7-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3422A7-E/SN.pdf

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

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Product details

Overview

MCP3422A7-E/SN from Microchip Technology is a 2-channel, 18-bit delta-sigma analog-to-digital converter (ADC) with differential inputs, on-board 2.048V reference (±0.05% accuracy), programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting up to 3.4 MHz. It delivers 3.75 SPS at 18-bit resolution, consumes 135 µA typical in continuous mode (VDD = 3V), and operates across –40°C to +125°C - enabling high-precision sensor digitization in battery-powered instrumentation and industrial monitoring systems.

For engineers reviewing the MCP3422A7-E/SN datasheet, MCP3422A7-E/SN pinout, MCP3422A7-E/SN application, or MCP3422A7-E/SN equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain support details specific to this SOIC-8 variant.

Technical Context

The MCP3422A7-E/SN implements a fully integrated delta-sigma conversion architecture with internal oscillator, self-calibrating offset/gain correction per conversion, and a switched-capacitor input stage featuring 3.2 pF sampling capacitance. Its two differential input channels (CH1±, CH2±) support both differential and single-ended configurations, with input impedance scaling inversely with PGA gain (e.g., 2.25 MΩ at x1, 281 kΩ at x8).

It uses a 2.048V on-chip reference to define ±2.048V full-scale differential range (4.096V total), enabling direct RTD/thermocouple/bridge signal digitization without external reference. Conversion modes include one-shot (36 µA standby) and continuous (135 µA typical), with data rates programmable via I²C configuration bits - all operating from a single 2.7V–5.5V supply.

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; no missing codes guaranteed.
Differential Input Range	±2.048V / PGA - enables direct measurement of low-level bridge or thermocouple outputs with gain scaling.
INL Error	10 ppm of FSR (typical) - ensures ≤0.0025% linearity error over full scale at 18-bit mode, critical for precision weighing and calibration.
On-board Reference	2.048V ±0.05% (±1.024 mV), 15 ppm/°C drift - eliminates need for external reference and reduces BOM count and layout area.
Supply Current	135 µA typical (VDD = 3V, continuous); 36 µA typical (VDD = 3V, one-shot @1 SPS) - supports ultra-low-power portable and energy-harvesting designs.
I²C Interface	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) modes - compatible with legacy and high-throughput microcontrollers without protocol translation.
Operating Temp	–40°C to +125°C - qualified for under-hood automotive sensors, factory automation, and industrial control environments.

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), surface-mount, RoHS-compliant, with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.75 mm height). Thermal resistance θ_JA = 149.5°C/W; exposed pad not present (SOIC variant).

Pin	Circuit Role	Design Meaning
1	CH1+	Positive differential input for Channel 1; accepts signals from VSS–0.3V to VDD+0.3V; used with CH1– for true differential measurement.
2	CH1–	Negative differential input for Channel 1; tied to VSS for single-ended operation; shares same voltage range constraints as CH1+.
3	CH2+	Positive differential input for Channel 2; electrically isolated from CH1 path; supports independent sensor interfacing (e.g., dual RTDs).
4	CH2–	Negative differential input for Channel 2; enables simultaneous two-sensor acquisition without multiplexer switching latency.
5	VSS	Analog/digital ground reference; must connect to low-impedance analog ground plane to minimize noise coupling into ADC front-end.
6	VDD	Single power supply input (2.7V–5.5V); requires 0.1 µF ceramic + 10 µF tantalum decoupling per datasheet layout guidelines.
7	SDA	Open-drain bidirectional I²C data line; requires external pull-up (5–10 kΩ) to VDD; transmits conversion results and receives configuration commands.
8	SCL	Open-drain I²C clock input; driven by master; rising edge latches input data, falling edge outputs data; pull-up resistor required.

Key Features

Feature	Design Value
Self-calibration per conversion	Automatically corrects offset and gain errors before each sample - eliminates system-level recalibration routines and maintains accuracy across temperature and supply drift.
Programmable PGA (x1/x2/x4/x8)	Amplifies weak sensor signals (e.g., <100 µV from strain gauges) prior to digitization - preserves SNR and avoids external op-amp stages.
Differential input architecture	Rejects common-mode noise up to 110 dB (PGA=8) - essential for noisy industrial environments where EMI corrupts single-ended measurements.
One-shot conversion mode	Reduces average current to ~36 µA (VDD=3V) during idle - extends battery life in portable fuel gauges and handheld test equipment.
Internal 2.048V reference	Provides stable, low-drift reference without external components - simplifies layout, improves long-term stability, and reduces cost vs. discrete reference solutions.

Applications

Temperature Sensing	Bridge-Based Pressure Sensing
Use Scenario: Digitizing output from Pt100 RTDs or K-type thermocouples in HVAC controllers and process monitoring systems. IC Role / Device Role / Timing Role: Precision 18-bit differential ADC with built-in reference and PGA - directly interfaces sensor outputs without signal conditioning. Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C using self-calibration and low INL (10 ppm), eliminating external calibration hardware.	Use Scenario: Reading Wheatstone bridge outputs from MEMS pressure sensors in medical infusion pumps and industrial transmitters. IC Role / Device Role / Timing Role: Low-noise, high-resolution ADC with differential inputs and programmable gain - captures microvolt-level bridge imbalances. Use Value: Delivers 0.01% FS resolution at 3.75 SPS, enabling sub-mbar pressure resolution without external amplifiers or filters.
Weigh Scale Systems	Battery Fuel Gauging
Use Scenario: Converting load cell outputs in retail scales and industrial platform weighers requiring NTEP certification. IC Role / Device Role / Timing Role: Dual-channel 18-bit ΔΣ ADC with on-chip reference - supports ratiometric measurements and channel switching for tare/weight sequencing. Use Value: 10 ppm INL and auto-calibration ensure repeatability within 10 ppm over temperature - meets Class III legal-for-trade metrology requirements.	Use Scenario: Monitoring cell voltage and current sense shunt voltages in lithium-ion battery packs for UPS and portable tools. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC with one-shot mode - samples voltage/current only when needed to conserve battery energy. Use Value: 135 µA continuous / 36 µA standby current enables >1-year battery life in low-duty-cycle fuel gauge applications.

Temperature Sensing

Bridge-Based Pressure Sensing

Use Scenario: Digitizing output from Pt100 RTDs or K-type thermocouples in HVAC controllers and process monitoring systems.

IC Role / Device Role / Timing Role: Precision 18-bit differential ADC with built-in reference and PGA - directly interfaces sensor outputs without signal conditioning.

Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C using self-calibration and low INL (10 ppm), eliminating external calibration hardware.

Use Scenario: Reading Wheatstone bridge outputs from MEMS pressure sensors in medical infusion pumps and industrial transmitters.

IC Role / Device Role / Timing Role: Low-noise, high-resolution ADC with differential inputs and programmable gain - captures microvolt-level bridge imbalances.

Use Value: Delivers 0.01% FS resolution at 3.75 SPS, enabling sub-mbar pressure resolution without external amplifiers or filters.

Weigh Scale Systems

Battery Fuel Gauging

Use Scenario: Converting load cell outputs in retail scales and industrial platform weighers requiring NTEP certification.

IC Role / Device Role / Timing Role: Dual-channel 18-bit ΔΣ ADC with on-chip reference - supports ratiometric measurements and channel switching for tare/weight sequencing.

Use Value: 10 ppm INL and auto-calibration ensure repeatability within 10 ppm over temperature - meets Class III legal-for-trade metrology requirements.

Use Scenario: Monitoring cell voltage and current sense shunt voltages in lithium-ion battery packs for UPS and portable tools.

IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC with one-shot mode - samples voltage/current only when needed to conserve battery energy.

Use Value: 135 µA continuous / 36 µA standby current enables >1-year battery life in low-duty-cycle fuel gauge applications.

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
ADS112C04IPWR (TI)	4-channel, integrated PGA (x1–128), 16-bit SAR architecture (not ΔΣ), no on-board reference - requires external 2.048V ref.	Higher channel count but lower resolution (16-bit max) and no auto-calibration - suited for multi-sensor systems where speed > precision.	Select if needing >2 channels or faster conversion (up to 2 kSPS), accepting trade-off in INL (12 ppm) and absence of self-calibration.
MCP3426-E/SN	Same family, 2-channel, but factory-programmed I²C address differs (0x68 vs. MCP3422A7-E/SN's 0x68–0x6F depending on A0/A1); identical specs otherwise.	Pin-compatible and functionally identical - used where fixed I²C address simplifies firmware or avoids bus conflicts in multi-device systems.	Choose when deterministic I²C addressing is required without external address pins; same PCB layout and performance as MCP3422A7-E/SN.

Compared with ADS112C04IPWR and MCP3426-E/SN, the MCP3422A7-E/SN uniquely combines 18-bit ΔΣ resolution, on-chip reference, per-conversion self-calibration, and SOIC-8 compactness - making it optimal for space-constrained, high-accuracy, low-power dual-sensor applications where long-term stability is critical.

Availability

MCP3422A7-E/SN is available at Aetrix Electronics and suitable for industrial instrumentation, battery-powered sensor nodes, and automotive cabin temperature monitoring requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for MCP3422A7-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and interface ICs, with a focus on reliability, longevity, and embedded-system integration.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal digitization in harsh environments - targeting applications demanding metrology-grade linearity, thermal stability, and simplified system design through integrated reference and PGA.

FAQ

What is the factory-programmed I²C address of the MCP3422A7-E/SN?

The MCP3422A7-E/SN has its I²C address permanently programmed during manufacturing and defaults to 0x68 (7-bit address). Unlike the MCP3423/24 variants, it lacks external Adr0/Adr1 pins - ensuring predictable bus behavior in multi-device systems without address jumpers or firmware configuration overhead. This fixed address simplifies initialization in resource-constrained microcontrollers.

Does the MCP3422A7-E/SN support single-ended input configurations?

Yes, the MCP3422A7-E/SN supports single-ended operation: tie CH1– or CH2– to VSS, then apply the signal to CH1+ or CH2+. However, doing so sacrifices common-mode noise rejection and halves effective resolution due to loss of differential signaling benefits. For best accuracy and noise immunity, differential connection is strongly recommended per Microchip's design guidelines.

How does the self-calibration feature impact system-level timing in the MCP3422A7-E/SN?

Each self-calibration cycle adds ~10 ms to the total conversion time at 18-bit resolution (3.75 SPS), as it performs internal offset and gain corrections before digitizing the input. This is transparent to firmware but means the effective throughput remains 3.75 conversions/second - not reduced by external calibration routines. The feature eliminates need for periodic system-level recalibration, improving long-term reliability in unattended deployments.

Can the MCP3422A7-E/SN operate reliably at 2.7V supply while maintaining full 18-bit performance?

Yes - the MCP3422A7-E/SN is fully specified from 2.7V to 5.5V. At 2.7V, it maintains 18-bit resolution, ±0.05% reference accuracy, and 10 ppm INL, with typical supply current dropping to 125 µA (continuous mode). All electrical characteristics in DS22088C are validated across this full voltage range, including extended temperature operation up to +125°C.

What is the maximum source impedance supported for accurate measurements with the MCP3422A7-E/SN?

For ≤0.1% gain error at PGA = 1, the recommended maximum source impedance is 1 kΩ. Higher impedances degrade settling time and increase INL/gain errors due to interaction with the 3.2 pF internal sampling capacitor. With PGA = 8, the limit drops to ~125 Ω. Microchip advises using a unity-gain buffer (e.g., MCP6001) for sources >100 Ω to preserve specified accuracy.

MCP3422A7-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:: -

MCP3422A7-E/SN FAQ

1.How can I place an order for MCP3422A7-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3422A7-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 MCP3422A7-E/SN reliable?

The price and inventory of MCP3422A7-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 MCP3422A7-E/SN is usually 5 days.

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MCP3422A7-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3422A7-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 MCP3422A7-E/SN?

For technical support, including MCP3422A7-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A7-E/SN requirements.

6.How does Aetrix verify that MCP3422A7-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3422A7-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 MCP3422A7-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3422A7-E/SN?

All MCP3422A7-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A7-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 MCP3422A7-E/SN part is unused and in its original packaging.

Return procedure for MCP3422A7-E/SN:

1.Submit a request within 90 days.

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

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