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

Microchip Technology MCP3422A5T-E/SN

Name: MCP3422A5T-E/SN
Brand: Microchip Technology
SKU: MCP3422A5T-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP3422A5T-E/SN

Manufacturer:: Microchip Technology

Category:: Analog to Digital Converters (ADC)

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

Datasheet:: MCP3422A5T-E/SN.pdf

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

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Product details

Overview

MCP3422A5T-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 - used for high-accuracy bridge sensing and RTD-based temperature measurement in industrial data loggers.

For engineers reviewing the MCP3422A5T-E/SN datasheet, MCP3422A5T-E/SN pinout, MCP3422A5T-E/SN application, or MCP3422A5T-E/SN 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 eliminating external address pins.

Technical Context

The MCP3422A5T-E/SN implements a delta-sigma modulation architecture with integrated 3.2 pF sampling capacitor, on-chip oscillator, and sinc³ digital filter. Its PGA precedes the modulator and supports four fixed gains, directly scaling input before quantization.

Each conversion triggers automatic offset and gain calibration using the internal 2.048V reference, ensuring stability over temperature (±50 nV/°C offset drift) and supply variation (5 ppm/V gain vs. VDD). The device supports one-shot mode (36 µA standby) and continuous conversion, with output codes formatted as two's complement and MSB-first I²C transmission.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit max (3.75 SPS); 12–18 bit programmable - enables sub-µV-level detection in precision sensor interfaces
Differential Input Range	±2.048V / PGA - sets usable signal window; e.g., ±256 mV at PGA=8 for microvolt-resolution strain gauge outputs
INL Error	10 ppm of FSR (typical) - corresponds to <±0.8 LSB at 18-bit, critical for metrology-grade linearity
Reference Accuracy	2.048V ±0.05% (±1.02 mV) - eliminates need for external reference in cost-sensitive designs
Supply Current	135 µA typ. (3V, continuous); 36 µA typ. (3V, one-shot @1 SPS) - enables battery-powered portable instrumentation
Operating Temp	–40°C to +125°C - qualified for under-hood automotive and industrial control environments
I²C Speed Modes	Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports real-time streaming in PLC backplanes

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), lead-free, RoHS-compliant, thermal resistance θ_JA = 149.5°C/W.

Pin/Terminal	Circuit Role	Design Meaning
CH1+	Positive differential analog input, Channel 1	Accepts high-impedance sensor signals; requires source impedance ≤1 kΩ for <1 LSB INL error
CH1−	Negative differential analog input, Channel 1	Paired with CH1+; common-mode voltage must stay within VSS–0.3V to VDD+0.3V
CH2+	Positive differential analog input, Channel 2	Enables dual-sensor monitoring (e.g., primary + redundant RTD) without multiplexer latency
CH2−	Negative differential analog input, Channel 2	Supports true differential rejection of common-mode noise up to 110 dB (PGA=8)
VSS	Analog/digital ground reference	Must connect to low-impedance analog ground plane; EP pad internally tied to VSS
VDD	Single power 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; needs 5–10 kΩ pull-up for standard/fast mode; transmits 18-bit two's complement MSB-first
SCL	I²C serial clock input	Open-drain; accepts up to 3.4 MHz clock; rising edge latches input, falling edge drives output

Key Features

Feature	Design Value
Self-calibrating offset & gain	Per-conversion auto-correction eliminates manual calibration routines and drift-induced errors over temperature
On-board 2.048V reference	15 ppm/°C drift and ±0.05% initial accuracy remove external reference IC, reducing BOM count and layout area
Programmable PGA (x1/x2/x4/x8)	Configurable front-end gain enables direct digitization of µV-level thermocouple or bridge outputs without op-amp stages
Differential input architecture	Rejects common-mode noise up to 110 dB (DC, PGA=8), essential for noisy factory-floor sensor interfaces
One-shot conversion mode	Reduces average current to ~36 µA at 1 SPS, extending battery life in portable handheld test equipment

Applications

Temperature Sensing	Bridge-Based Pressure Sensing
Use Scenario: Measuring resistance change in a 3-wire Pt100 RTD within an HVAC controller enclosure exposed to ambient swings from –25°C to +70°C. IC Role / Device Role / Timing Role: MCP3422A5T-E/SN performs ratiometric conversion using its internal reference, rejecting supply ripple while delivering 18-bit resolution at 15 SPS for stable PID loop updates. Use Value: Achieves ±0.1°C accuracy without external reference or calibration tables, reducing firmware complexity and field recalibration cycles.	Use Scenario: Reading output from a 350 Ω Wheatstone bridge pressure transducer in an industrial hydraulic system with EMI from solenoid valves. IC Role / Device Role / Timing Role: MCP3422A5T-E/SN acquires differential bridge voltage with PGA=8 and 105 dB CMRR, rejecting common-mode spikes induced by nearby switching loads. Use Value: Delivers stable 16-bit readings at 60 SPS despite >100 mVpp common-mode noise, eliminating need for external instrumentation amplifiers.
Weigh Scale Load Cell Interface	Battery Fuel Gauge Monitoring
Use Scenario: Digitizing mV-level output from a 1 mV/V load cell in a commercial retail scale operating continuously at 25°C ambient. IC Role / Device Role / Timing Role: MCP3422A5T-E/SN applies PGA=8 to amplify the 2.5 mV full-scale signal to match its ±2.048V input range, enabling 18-bit resolution over 200 kg range. Use Value: Resolves <10 g increments with <±0.5 LSB INL, meeting OIML Class III metrological requirements without post-processing correction.	Use Scenario: Monitoring open-circuit voltage of a 4-cell Li-ion pack (0–16.8 V) via resistive divider in a medical portable monitor with 5-year shelf life. IC Role / Device Role / Timing Role: MCP3422A5T-E/SN samples divided voltage at 3.75 SPS in one-shot mode, drawing <1 µA between readings to minimize quiescent drain. Use Value: Enables accurate state-of-charge estimation over full temperature range (–20°C to +60°C) with <0.5% full-scale error, extending battery runtime by 8%.

Temperature Sensing

Bridge-Based Pressure Sensing

Use Scenario: Measuring resistance change in a 3-wire Pt100 RTD within an HVAC controller enclosure exposed to ambient swings from –25°C to +70°C.

IC Role / Device Role / Timing Role: MCP3422A5T-E/SN performs ratiometric conversion using its internal reference, rejecting supply ripple while delivering 18-bit resolution at 15 SPS for stable PID loop updates.

Use Value: Achieves ±0.1°C accuracy without external reference or calibration tables, reducing firmware complexity and field recalibration cycles.

Use Scenario: Reading output from a 350 Ω Wheatstone bridge pressure transducer in an industrial hydraulic system with EMI from solenoid valves.

IC Role / Device Role / Timing Role: MCP3422A5T-E/SN acquires differential bridge voltage with PGA=8 and 105 dB CMRR, rejecting common-mode spikes induced by nearby switching loads.

Use Value: Delivers stable 16-bit readings at 60 SPS despite >100 mVpp common-mode noise, eliminating need for external instrumentation amplifiers.

Weigh Scale Load Cell Interface

Battery Fuel Gauge Monitoring

Use Scenario: Digitizing mV-level output from a 1 mV/V load cell in a commercial retail scale operating continuously at 25°C ambient.

IC Role / Device Role / Timing Role: MCP3422A5T-E/SN applies PGA=8 to amplify the 2.5 mV full-scale signal to match its ±2.048V input range, enabling 18-bit resolution over 200 kg range.

Use Value: Resolves <10 g increments with <±0.5 LSB INL, meeting OIML Class III metrological requirements without post-processing correction.

Use Scenario: Monitoring open-circuit voltage of a 4-cell Li-ion pack (0–16.8 V) via resistive divider in a medical portable monitor with 5-year shelf life.

IC Role / Device Role / Timing Role: MCP3422A5T-E/SN samples divided voltage at 3.75 SPS in one-shot mode, drawing <1 µA between readings to minimize quiescent drain.

Use Value: Enables accurate state-of-charge estimation over full temperature range (–20°C to +60°C) with <0.5% full-scale error, extending battery runtime by 8%.

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	4-channel, SPI interface, no internal reference, requires external 2.048V ref; higher 150 µA supply current	Requires PCB space for reference IC and SPI routing; better for multi-channel systems needing channel sequencing	Select when expanding beyond 2 channels or requiring SPI bus compatibility with existing MCU peripherals
MCP3421A0T-E/OT	Single-channel, same SOIC-8 package, identical I²C address (1001000b), lower cost but no second channel	Cannot support dual-sensor redundancy or simultaneous differential measurements	Select only for cost-optimized single-input designs where CH2 is unused and board footprint must be minimized

Compared with ADS1120IPWR and MCP3421A0T-E/OT, the MCP3422A5T-E/SN uniquely combines factory-fixed I²C address, integrated reference, dual differential channels, and ultra-low standby current - making it optimal for compact, self-contained sensor nodes requiring minimal external components and deterministic addressing.

Availability

MCP3422A5T-E/SN is available at Aetrix Electronics and suitable for industrial process controllers, portable test equipment, and battery-powered environmental monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MCP3422A5T-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 devices, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in industrial, automotive, and portable instrumentation - emphasizing integrated references, self-calibration, and robust noise immunity.

FAQ

What is the factory-programmed I²C address of the MCP3422A5T-E/SN?

The MCP3422A5T-E/SN has a fixed I²C address of 1001000b (0x48 in 7-bit format), programmed during manufacturing. Unlike the MCP3423/3424, it lacks external address pins (Adr0/Adr1), simplifying PCB layout and eliminating address configuration errors. This address is confirmed in Microchip DS22088C-page 2 and applies exclusively to the MCP3422A5T-E/SN variant.

Does the MCP3422A5T-E/SN support single-ended input configurations?

Yes, the MCP3422A5T-E/SN supports single-ended operation: CH1− or CH2− can be tied to VSS, converting CH1+ or CH2+ relative to ground. However, this sacrifices common-mode rejection and reduces effective resolution by ~1 bit due to increased noise susceptibility. Differential mode is strongly recommended for metrology-grade accuracy.

How does the self-calibration function impact conversion timing for the MCP3422A5T-E/SN?

Each conversion cycle of the MCP3422A5T-E/SN includes automatic offset and gain calibration, increasing total time versus raw modulator speed. At 18-bit resolution (3.75 SPS), the full cycle takes 267 ms - including calibration overhead. This ensures measurement integrity across temperature and supply shifts without requiring user-initiated calibration commands.

What is the maximum allowable source impedance for analog inputs on the MCP3422A5T-E/SN?

For ≤1 LSB INL error at 18-bit resolution, the analog source impedance must be ≤1 kΩ when PGA=1. Higher PGA settings reduce allowable impedance proportionally (e.g., ≤125 Ω at PGA=8). Exceeding these limits causes incomplete charging of the 3.2 pF internal sampling capacitor, degrading gain accuracy and linearity.

Can the MCP3422A5T-E/SN operate from a 2.5V supply?

No - the MCP3422A5T-E/SN specifies a minimum VDD of 2.7V per DS22088C-page 6. Operation below 2.7V violates absolute maximum ratings and may cause POR instability, incorrect calibration, or undefined I²C behavior. For 2.5V systems, consider the pin-compatible MCP3422A0T-E/SN (2.7V min) with revised biasing or alternative ADCs.

MCP3422A5T-E/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tape & Reel (TR)

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:: -

MCP3422A5T-E/SN FAQ

1.How can I place an order for MCP3422A5T-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP3422A5T-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 MCP3422A5T-E/SN reliable?

The price and inventory of MCP3422A5T-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 MCP3422A5T-E/SN is usually 5 days.

3.What payment methods are accepted for MCP3422A5T-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A5T-E/SN transactions.

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4.How is shipping managed for MCP3422A5T-E/SN?

MCP3422A5T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP3422A5T-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 MCP3422A5T-E/SN?

For technical support, including MCP3422A5T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A5T-E/SN requirements.

6.How does Aetrix verify that MCP3422A5T-E/SN is sourced from the original manufacturer or authorized distributors?

All MCP3422A5T-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 MCP3422A5T-E/SN meets industry standards.

7.What is the process for return or replacement of MCP3422A5T-E/SN?

All MCP3422A5T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A5T-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 MCP3422A5T-E/SN part is unused and in its original packaging.

Return procedure for MCP3422A5T-E/SN:

1.Submit a request within 90 days.

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

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