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

Microchip Technology MCP3422A5-E/MC

Name: MCP3422A5-E/MC
Brand: Microchip Technology
SKU: MCP3422A5-E/MC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3422A5-E/MC

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

Package:: 8-VFDFN Exposed Pad

Datasheet:: MCP3422A5-E/MC.pdf

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

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Product details

Overview

MCP3422A5-E/MC from Microchip Technology is a 2-channel, 18-bit delta-sigma analog-to-digital converter 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 10 ppm INL, 3.75–240 SPS data rates, and operates from 2.7V to 5.5V across –40°C to +125°C - used in high-accuracy bridge sensing and RTD-based temperature measurement systems.

For engineers reviewing the MCP3422A5-E/MC datasheet, MCP3422A5-E/MC pinout, MCP3422A5-E/MC application, or MCP3422A5-E/MC equivalent, key selection criteria include differential input resolution at 18 bits, self-calibrating offset/gain per conversion, PGA gain flexibility, low 135 µA typical supply current in continuous mode, and factory-programmed I²C address for plug-and-play integration into compact sensor front-ends.

Technical Context

The MCP3422A5-E/MC implements a fully integrated delta-sigma ADC architecture with internal oscillator, switched-capacitor sampling (3.2 pF), and automatic per-conversion offset/gain calibration. Its two differential input channels share a single 2.048V reference and PGA, enabling precise ratiometric measurements without external components.

It supports both one-shot and continuous conversion modes via I²C configuration, with resolution and data rate tightly coupled: 18-bit/3.75 SPS, 16-bit/15 SPS, 14-bit/60 SPS, or 12-bit/240 SPS. The device uses binary two's complement output coding and locks saturated codes (0x000000 or 0x800000) beyond ±2.048V/PGA full-scale range.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit max; delivers 10 ppm INL over full scale, enabling sub-µV-level voltage discrimination in precision sensor interfaces.
Data Rate	3.75 SPS (18-bit) to 240 SPS (12-bit); trade-off between resolution and throughput is software-selectable per conversion.
PGA Gains	x1, x2, x4, x8; allows direct digitization of mV-range signals (e.g., 256 µV LSB at x8 gain, 18-bit) without external amplification.
Reference Voltage	2.048 V ±0.05%; integrated, drift-compensated reference eliminates need for external precision VREF and reduces BOM count.
Supply Current	135 µA typical (VDD = 3V, continuous); enables battery-powered instrumentation with multi-year runtime in low-duty-cycle sensing.
Input Range	±2.048 V / PGA differentially; supports direct connection to Wheatstone bridges, thermocouples, and RTDs with appropriate signal conditioning.
Operating Temp	–40°C to +125°C; qualified for under-hood automotive, industrial control, and harsh-environment monitoring applications.

Pinout & Package

The MCP3422A5-E/MC is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), pin-compatible with industry-standard SOIC-8 footprints and optimized for thermal dissipation in space-constrained PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Differential analog input, channel 1 positive	Accepts high-impedance voltage source; must be paired with CH1– for true differential operation or referenced to VSS for pseudo-single-ended use.
CH1–	Differential analog input, channel 1 negative	Completes differential pair with CH1+; common-mode voltage must stay within VSS–0.3V to VDD+0.3V to avoid ESD diode conduction.
CH2+	Differential analog input, channel 2 positive	Independent second channel; shares same PGA, reference, and conversion engine as CH1 - time-multiplexed, not simultaneous.
CH2–	Differential analog input, channel 2 negative	Enables dual-sensor monitoring (e.g., temperature + pressure) without external multiplexer or additional ADC hardware.
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP pad is internally tied to VSS and requires PCB soldering to ground for thermal and noise performance.
VDD	Positive supply rail	2.7–5.5V single supply; requires 0.1 µF ceramic + optional 10 µF tantalum decoupling adjacent to pin for stable conversion accuracy.
SDA	I²C bidirectional data line	Open-drain output/input; needs external pull-up (5–10 kΩ) to VDD; transmits 24-bit conversion results and accepts 8-bit configuration writes.
SCL	I²C serial clock input	Open-drain compatible; accepts standard (100 kHz), fast (400 kHz), or high-speed (3.4 MHz) clock; timing critical for reliable register access.

Key Features

Feature	Design Value
Self-calibrating offset & gain	Eliminates need for system-level calibration routines; ensures <±15 µV offset error and <0.35% gain error across temperature and supply variation.
On-board 2.048V reference	15 ppm/°C drift and ±0.05% initial accuracy enable stable ratiometric measurements without external reference ICs or trimming.
Programmable data rate	Four discrete SPS options let designers match conversion speed to sensor dynamics - e.g., 3.75 SPS for slow-drift RTDs, 240 SPS for transient bridge response.
One-shot conversion mode	Reduces average current to <1 µA during idle periods; ideal for wake-on-event architectures using microcontroller GPIO-triggered conversions.
Differential input structure	Rejects common-mode noise >105 dB (DC, PGA=1); preserves signal integrity in electrically noisy factory automation or motor drive environments.

Applications

Temperature Sensing with RTD	Bridge Sensing for Pressure
Use Scenario: High-accuracy industrial temperature monitoring using Pt100 or Pt1000 resistance temperature detectors in HVAC or process control systems. IC Role / Device Role / Timing Role: Digitizes low-level voltage drop across RTD in constant-current excitation circuit; performs auto-calibrated 18-bit conversion with 3.75 SPS for thermal stability. Use Value: Achieves <0.1°C temperature resolution without external op-amps or reference buffers, reducing component count and layout complexity.	Use Scenario: Precision pressure measurement in medical infusion pumps or industrial hydraulic sensors using quarter-bridge or full-bridge strain gauges. IC Role / Device Role / Timing Role: Reads differential output of Wheatstone bridge; applies x8 PGA gain to amplify µV-level signals before 18-bit digitization. Use Value: Delivers <10 ppm INL and 105 dB CMRR to reject supply noise and EMI, enabling <0.05% FS pressure accuracy in compact designs.
Weigh Scales	Battery Fuel Gauges
Use Scenario: Platform scales and retail point-of-sale terminals requiring sub-gram weight resolution and long-term zero stability. IC Role / Device Role / Timing Role: Interfaces with load cell outputs; uses one-shot mode to trigger conversion only during active weighing, minimizing power draw. Use Value: Self-calibration maintains zero-point accuracy over temperature cycles and battery voltage sag, eliminating manual recalibration.	Use Scenario: State-of-charge estimation in portable medical devices or handheld test equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: Measures battery terminal voltage and current-sense shunt voltage differentially; runs at 15 SPS (16-bit) for responsive yet stable readings. Use Value: On-board reference and PGA eliminate need for matched resistor dividers or external references, improving SOC accuracy across discharge curves.

Temperature Sensing with RTD

Bridge Sensing for Pressure

Use Scenario: High-accuracy industrial temperature monitoring using Pt100 or Pt1000 resistance temperature detectors in HVAC or process control systems.

IC Role / Device Role / Timing Role: Digitizes low-level voltage drop across RTD in constant-current excitation circuit; performs auto-calibrated 18-bit conversion with 3.75 SPS for thermal stability.

Use Value: Achieves <0.1°C temperature resolution without external op-amps or reference buffers, reducing component count and layout complexity.

Use Scenario: Precision pressure measurement in medical infusion pumps or industrial hydraulic sensors using quarter-bridge or full-bridge strain gauges.

IC Role / Device Role / Timing Role: Reads differential output of Wheatstone bridge; applies x8 PGA gain to amplify µV-level signals before 18-bit digitization.

Use Value: Delivers <10 ppm INL and 105 dB CMRR to reject supply noise and EMI, enabling <0.05% FS pressure accuracy in compact designs.

Weigh Scales

Battery Fuel Gauges

Use Scenario: Platform scales and retail point-of-sale terminals requiring sub-gram weight resolution and long-term zero stability.

IC Role / Device Role / Timing Role: Interfaces with load cell outputs; uses one-shot mode to trigger conversion only during active weighing, minimizing power draw.

Use Value: Self-calibration maintains zero-point accuracy over temperature cycles and battery voltage sag, eliminating manual recalibration.

Use Scenario: State-of-charge estimation in portable medical devices or handheld test equipment powered by Li-ion batteries.

IC Role / Device Role / Timing Role: Measures battery terminal voltage and current-sense shunt voltage differentially; runs at 15 SPS (16-bit) for responsive yet stable readings.

Use Value: On-board reference and PGA eliminate need for matched resistor dividers or external references, improving SOC accuracy across discharge curves.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS1115IDGSR	4-channel, 16-bit, 860 SPS max; no internal reference; requires external 2.048V VREF or external gain stage for µV signals.	Higher channel count but lower resolution and no self-calibration; better suited for multi-sensor polling where absolute accuracy is secondary to throughput.	Select ADS1115IDGSR when needing four independent inputs and external reference control, but accept higher system-level calibration burden.
MCP3421A0T-E/OT	Single-channel, 18-bit, identical PGA/reference/calibration architecture; same SOIC-8 package; factory-set I²C address 0x68 (vs. MCP3422A5-E/MC's 0x69).	No channel multiplexing; simpler firmware but requires separate ADC per sensor; ideal for space-constrained single-signal nodes.	Choose MCP3421A0T-E/OT for cost-sensitive, single-input designs where board area and firmware simplicity outweigh dual-channel benefit.

Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3422A5-E/MC uniquely balances dual-channel capability, 18-bit resolution, self-calibration, and integrated reference in SOIC-8 - making it optimal for compact, high-accuracy two-sensor systems without external support components.

Availability

MCP3422A5-E/MC is available at Aetrix Electronics and suitable for precision temperature sensing, bridge-based pressure measurement, weigh scale electronics, and battery fuel gauge subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP3422A5-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 leading provider of microcontrollers, analog, and Flash-IP solutions, serving industrial, automotive, communications, and consumer markets with high-reliability silicon and development tools.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal acquisition in space- and power-constrained embedded systems - emphasizing integrated functionality, minimal external components, and robust operation across industrial temperatures.

FAQ

What is the factory-programmed I²C address of the MCP3422A5-E/MC?

The MCP3422A5-E/MC has a fixed, factory-programmed I²C address of 0x69 (binary 1101001). Unlike the MCP3423/3424 variants, it lacks external address pins (Adr0/Adr1), so multiple MCP3422A5-E/MC devices require address isolation via I²C bus segmentation or GPIO-controlled reset sequencing. This simplifies layout but limits daisy-chaining on a shared bus.

Does the MCP3422A5-E/MC support true simultaneous sampling of both channels?

No, the MCP3422A5-E/MC does not support simultaneous sampling. It uses a single ADC core with an internal multiplexer to sequentially sample CH1 and CH2. Channel selection is controlled via I²C configuration register bits, and conversions occur one at a time. For time-correlated dual-sensor measurements, firmware must minimize the interval between consecutive channel reads or use external synchronization.

How does the self-calibration function impact conversion time for the MCP3422A5-E/MC?

Self-calibration is performed automatically before each conversion and is included in the specified data rate - e.g., the 3.75 SPS rating for 18-bit mode already accounts for full offset and gain calibration overhead. No additional delay or host intervention is required. This ensures consistent accuracy across temperature and supply shifts without sacrificing guaranteed timing predictability in real-time control loops.

Can the MCP3422A5-E/MC operate with a 2.5V supply voltage?

No, the MCP3422A5-E/MC requires a minimum supply voltage of 2.7V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7V may result in undefined behavior, failure to initialize, or degraded reference accuracy and INL performance. For 2.5V systems, consider the MCP3426 (2.0V–5.5V supply range) or level-shifting the I²C bus while maintaining VDD ≥2.7V.

What is the purpose of the exposed thermal pad (EP) on the MCP3422A5-E/MC SOIC package?

The exposed thermal pad (EP) on the MCP3422A5-E/MC SOIC package is internally connected to VSS and must be soldered to a PCB copper pour tied to analog ground. It reduces thermal resistance (θJA ≈149.5°C/W vs. >200°C/W without EP), improves long-term stability by minimizing die temperature rise, and lowers ground impedance for cleaner analog measurements - especially critical during continuous conversion at elevated ambient temperatures.

MCP3422A5-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:: -

MCP3422A5-E/MC FAQ

1.How can I place an order for MCP3422A5-E/MC through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3422A5-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 MCP3422A5-E/MC reliable?

The price and inventory of MCP3422A5-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 MCP3422A5-E/MC is usually 5 days.

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Once your MCP3422A5-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 MCP3422A5-E/MC?

For technical support, including MCP3422A5-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A5-E/MC requirements.

6.How does Aetrix verify that MCP3422A5-E/MC is sourced from the original manufacturer or authorized distributors?

All MCP3422A5-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 MCP3422A5-E/MC meets industry standards.

7.What is the process for return or replacement of MCP3422A5-E/MC?

All MCP3422A5-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A5-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 MCP3422A5-E/MC part is unused and in its original packaging.

Return procedure for MCP3422A5-E/MC:

1.Submit a request within 90 days.

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

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