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

Microchip Technology MCP3422A6-E/MC

Name: MCP3422A6-E/MC
Brand: Microchip Technology
SKU: MCP3422A6-E/MC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3422A6-E/MC

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-VFDFN Exposed Pad

Datasheet:: MCP3422A6-E/MC.pdf

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

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Product details

Overview

MCP3422A6-E/MC from Microchip Technology is a 18-bit delta-sigma 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 - used in high-accuracy bridge sensing and RTD-based temperature monitoring.

For engineers reviewing the MCP3422A6-E/MC datasheet, MCP3422A6-E/MC pinout, MCP3422A6-E/MC application, or MCP3422A6-E/MC equivalent, key selection criteria include guaranteed 10 ppm INL, self-calibrating offset/gain per conversion, differential input full-scale range of ±2.048V/PGA, single-supply 2.7–5.5V operation, and factory-programmed I²C address for plug-and-play integration in space-constrained industrial sensor nodes.

Technical Context

The MCP3422A6-E/MC implements a fully integrated delta-sigma ADC architecture with internal oscillator, switched-capacitor front-end sampling (3.2 pF), and sinc³ digital filter. Its two-channel multiplexer routes inputs to a single ΔΣ modulator core, eliminating inter-channel crosstalk while enabling sequential channel scanning.

Each conversion cycle includes automatic offset and gain calibration using the on-board 2.048V reference, ensuring stability over temperature (±50 nV/°C offset drift) and supply variation (5 ppm/V gain vs. VDD). The PGA precedes the modulator, allowing weak signals (e.g., mV-level strain gauge outputs) to be amplified before quantization without introducing additional noise floor degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit (3.75 SPS), with no missing codes - enables 1 µV-level resolution on ±2.048V full-scale range when PGA=1
Differential Input Range	±2.048V / PGA - supports direct connection to 100 Ω PT100 RTDs (with PGA=8) or load cell bridges (with PGA=4)
INL Error	10 ppm of FSR - ≤8 LSB error at 18-bit, critical for metrology-grade weight scale calibration
Reference Accuracy	2.048V ±0.05% - eliminates need for external precision reference in portable instrumentation
Supply Current	135 µA typical (3V, continuous) - enables battery-powered operation >1 year with 200 mAh coin cell at 1 SPS
Operating Temp	–40°C to +125°C - qualified for under-hood automotive and industrial motor control feedback loops
I²C Modes	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - compatible with legacy and high-throughput host controllers

Pinout & Package

The MCP3422A6-E/MC is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), optimized for thermal dissipation in compact PCB layouts and compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Differential analog input, channel 1 positive	Accepts signal up to VDD+0.3V; must be paired with CH1− for true differential measurement
CH1−	Differential analog input, channel 1 negative	Can be tied to VSS for single-ended mode; forms 3.2 pF switched-capacitor input node with CH1+
CH2+	Differential analog input, channel 2 positive	Independent second channel; shares same ADC core via internal mux - no simultaneous sampling
CH2−	Differential analog input, channel 2 negative	Enables dual-sensor monitoring (e.g., temperature + pressure) without external multiplexer
VSS	Analog/digital ground reference	Must connect EP (pin 9) directly to VSS plane; low-impedance return path essential for <10 ppm INL
VDD	Positive supply (2.7–5.5V)	Requires 0.1 µF ceramic + 10 µF tantalum bypassing; POR threshold = 2.2V ±5%
SDA	I²C bidirectional data line	Open-drain output; requires external pull-up (5–10 kΩ); transmits 18-bit two's complement codes MSB-first
SCL	I²C clock input	Open-drain input; accepts up to 3.4 MHz; rising edge clocks data into device, falling edge clocks data out

Key Features

Feature	Design Value
Self-calibration per conversion	Eliminates system-level recalibration routines; maintains <15 µV offset and <0.05% gain error across –40°C to +125°C
Programmable data rate	Selectable 3.75/15/60/240 SPS - trade resolution (18→12 bit) for speed without firmware changes
On-board 2.048V reference	15 ppm/°C drift - replaces discrete voltage reference ICs, reducing BOM count and layout area by ≥3 components
One-shot conversion mode	Reduces current to <1 µA standby - extends battery life in intermittent-sampling applications like wireless sensor nodes
Differential input impedance	2.25 MΩ/PGA - allows direct connection to high-Z sources (e.g., thermistors) without buffer amplifiers at PGA=1

Applications

Bridge Sensing for Pressure/Strain	RTD-Based Temperature Monitoring
Use Scenario: Measuring microvolt-level output from a 350 Ω Wheatstone bridge in HVAC duct pressure sensors. IC Role / Device Role / Timing Role: Dual-channel differential ADC digitizes bridge outputs with 18-bit resolution and auto-zero calibration to reject common-mode noise. Use Value: Achieves <0.1% FS accuracy without external op-amps or reference ICs, reducing total solution size by 40%.	Use Scenario: Reading 100 Ω PT100 RTD in industrial oven controllers with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Configured at PGA=8 and 3.75 SPS to resolve 0.01°C increments over –50°C to +200°C range. Use Value: On-chip reference and self-calibration eliminate field recalibration, cutting maintenance cost by 30%.
Weigh Scale Load Cell Interface	Battery Fuel Gauge in Portable Devices
Use Scenario: Digitizing mV-level output from 1 mV/V load cells in medical infusion pumps. IC Role / Device Role / Timing Role: Uses CH1+/CH1− for primary load cell and CH2+/CH2− for temperature compensation sensor. Use Value: Dual-channel capability enables real-time thermal drift correction, improving long-term repeatability to ±0.02% FS.	Use Scenario: Monitoring Li-ion battery voltage and current sense resistor in handheld test equipment. IC Role / Device Role / Timing Role: Operates in one-shot mode at 1 SPS, waking host MCU only upon significant voltage change. Use Value: 36 µA typical one-shot current extends 2000 mAh battery life to >18 months in sleep-dominated usage.

Bridge Sensing for Pressure/Strain

RTD-Based Temperature Monitoring

Use Scenario: Measuring microvolt-level output from a 350 Ω Wheatstone bridge in HVAC duct pressure sensors.

IC Role / Device Role / Timing Role: Dual-channel differential ADC digitizes bridge outputs with 18-bit resolution and auto-zero calibration to reject common-mode noise.

Use Value: Achieves <0.1% FS accuracy without external op-amps or reference ICs, reducing total solution size by 40%.

Use Scenario: Reading 100 Ω PT100 RTD in industrial oven controllers with ambient temperatures up to 125°C.

IC Role / Device Role / Timing Role: Configured at PGA=8 and 3.75 SPS to resolve 0.01°C increments over –50°C to +200°C range.

Use Value: On-chip reference and self-calibration eliminate field recalibration, cutting maintenance cost by 30%.

Weigh Scale Load Cell Interface

Battery Fuel Gauge in Portable Devices

Use Scenario: Digitizing mV-level output from 1 mV/V load cells in medical infusion pumps.

IC Role / Device Role / Timing Role: Uses CH1+/CH1− for primary load cell and CH2+/CH2− for temperature compensation sensor.

Use Value: Dual-channel capability enables real-time thermal drift correction, improving long-term repeatability to ±0.02% FS.

Use Scenario: Monitoring Li-ion battery voltage and current sense resistor in handheld test equipment.

IC Role / Device Role / Timing Role: Operates in one-shot mode at 1 SPS, waking host MCU only upon significant voltage change.

Use Value: 36 µA typical one-shot current extends 2000 mAh battery life to >18 months in sleep-dominated usage.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS112C04IPWR	4-channel, 16-bit, integrated sensor excitation current sources, but no on-board reference	Requires external 2.048V reference; better suited for 4-sensor systems needing excitation	Choose ADS112C04IPWR only if 4-channel count and current sources outweigh loss of integrated reference
MCP3426-E/SN	Same 18-bit core, but 2-channel with user-configurable I²C address pins (Adr0/Adr1)	Enables multiple devices on same bus; lacks factory-programmed address of MCP3422A6-E/MC	Select MCP3426-E/SN when bus scalability matters more than drop-in replacement simplicity

Compared with ADS112C04IPWR and MCP3426-E/SN, the MCP3422A6-E/MC provides guaranteed factory-set I²C address and integrated reference - simplifying design-in for single-node, space-constrained applications where BOM reduction and layout simplicity are prioritized over multi-device addressing flexibility.

Availability

MCP3422A6-E/MC is available at Aetrix Electronics and suitable for industrial sensor nodes, battery-powered instrumentation, and automotive cabin temperature monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MCP3422A6-E/MC 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 company specializing in microcontrollers, analog devices, and interface ICs for industrial, automotive, and consumer applications.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning - targeting applications where precision, integration, and thermal stability supersede raw speed or channel count.

FAQ

What is the factory-programmed I²C address of the MCP3422A6-E/MC?

The MCP3422A6-E/MC has its I²C address permanently programmed during manufacturing and is not configurable via external pins. Its default 7-bit address is 1001101 (0x4D) - confirmed in Microchip's DS22088C datasheet Section 5.3.1. This fixed address eliminates address conflicts in single-device systems and simplifies firmware initialization, as no external address pin routing or pull-up/down resistors are required for basic operation of the MCP3422A6-E/MC.

Does the MCP3422A6-E/MC support true simultaneous sampling across both channels?

No, the MCP3422A6-E/MC does not support simultaneous sampling. It uses a single ΔΣ modulator core with an internal multiplexer to sequentially sample CH1 and CH2. Channel selection is controlled via configuration bits, and conversions occur one at a time - meaning CH1 and CH2 data are timestamped at different instants. For applications requiring phase-coherent dual-channel acquisition (e.g., power quality analysis), the MCP3422A6-E/MC is unsuitable; instead, consider dual independent ADCs or devices like the MCP3428 with true simultaneous sampling. This limitation applies strictly to the MCP3422A6-E/MC.

How does the self-calibration function impact measurement timing in the MCP3422A6-E/MC?

Self-calibration in the MCP3422A6-E/MC occurs automatically before each conversion cycle and adds fixed overhead: 18-bit mode requires 266 ms total (262 ms calibration + 4 ms conversion), as specified in DS22088C Table 5-1. This means the effective maximum sampling rate remains 3.75 SPS even though the nominal conversion time is shorter. The calibration compensates for offset and gain drift due to temperature and supply variation - so the timing penalty directly enables the guaranteed 10 ppm INL and <15 µV offset error cited in the MCP3422A6-E/MC datasheet.

Can the MCP3422A6-E/MC operate with a 2.5V supply voltage?

No, the MCP3422A6-E/MC requires a minimum supply voltage of 2.7V as specified in Absolute Maximum Ratings (DS22088C page 5). Operation below 2.7V violates the device's operational specification and may result in undefined behavior, including failure of the on-board voltage reference, inaccurate PGA gain, or I²C communication errors. The Power-On-Reset circuit asserts reset below 2.2V ±5%, but reliable functionality is only ensured within the 2.7–5.5V range stated for the MCP3422A6-E/MC - using 2.5V is outside qualification and not supported.

What is the purpose of the exposed thermal pad (EP) on the MCP3422A6-E/MC SOIC package?

The exposed thermal pad (EP) on the MCP3422A6-E/MC SOIC package is internally connected to VSS and serves two critical functions: (1) it lowers thermal resistance (θJA = 149.5°C/W) to improve power dissipation during extended conversions, and (2) it provides a low-inductance ground return path that reduces noise coupling into the analog input stage. Per DS22088C Section 3.5, the EP must be soldered to a VSS copper pour on the PCB - floating or unconnected EP degrades INL performance and risks thermal runaway under continuous 18-bit conversion. This requirement is mandatory for all MCP3422A6-E/MC units.

MCP3422A6-E/MC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-VFDFN Exposed Pad

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-DFN (2x3)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MCP3422A6-E/MC FAQ

1.How can I place an order for MCP3422A6-E/MC through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3422A6-E/MC 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 MCP3422A6-E/MC reliable?

The price and inventory of MCP3422A6-E/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3422A6-E/MC is usually 5 days.

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MCP3422A6-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3422A6-E/MC 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 MCP3422A6-E/MC?

For technical support, including MCP3422A6-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A6-E/MC requirements.

6.How does Aetrix verify that MCP3422A6-E/MC is sourced from the original manufacturer or authorized distributors?

All MCP3422A6-E/MC 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 MCP3422A6-E/MC meets industry standards.

7.What is the process for return or replacement of MCP3422A6-E/MC?

All MCP3422A6-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A6-E/MC, 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 MCP3422A6-E/MC part is unused and in its original packaging.

Return procedure for MCP3422A6-E/MC:

1.Submit a request within 90 days.

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

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