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Microchip Technology MCP3422A4T-E/MS
- Part No.:
- MCP3422A4T-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP3422A4T-E/MS.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
MCP3422A4T-E/MS 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 - enabling high-accuracy sensor digitization in battery-powered industrial monitoring systems.
For engineers reviewing the MCP3422A4T-E/MS datasheet, MCP3422A4T-E/MS pinout, MCP3422A4T-E/MS application, or MCP3422A4T-E/MS equivalent, this page provides verified technical context, real-world design implications of its self-calibrating architecture, PGA-configurable input sensitivity, and validated alternatives for precision low-power ADC selection.
Technical Context
The MCP3422A4T-E/MS implements a delta-sigma modulation architecture with integrated 3.2 pF sampling capacitor, on-chip oscillator, and automatic per-conversion offset/gain calibration - eliminating need for external calibration circuitry. Its switched-capacitor front-end requires careful source impedance management (<1 kΩ recommended) to maintain INL ≤10 ppm FSR.
It supports both one-shot (36 µA standby) and continuous conversion modes, with data rates tightly coupled to resolution: 3.75 SPS (18-bit), 15 SPS (16-bit), 60 SPS (14-bit), 240 SPS (12-bit). The factory-programmed I²C address enables plug-and-play integration without external address pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit max (3.75 SPS); no missing codes guaranteed at all rates |
| Differential Input Range | ±2.048V / PGA - full-scale range shrinks with higher gain (e.g., ±256 mV at x8) |
| INL Error | 10 ppm of FSR - translates to ±0.42 µV error at x1 gain, critical for RTD/thermocouple linearity |
| On-board Reference | 2.048V ±0.05% (15 ppm/°C drift) - eliminates external reference cost and layout area |
| Supply Current | 135 µA typical (3V, continuous); 36 µA typical (3V, one-shot @ 1 SPS) - enables multi-year battery life |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial edge nodes |
| I²C Modes | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports fast host polling without bus contention |
Pinout & Package
Package: 8-pin MSOP (3.0 × 4.9 mm, 0.65 mm pitch), exposed thermal pad (EP) internally connected to VSS - requires soldering EP to PCB ground plane for thermal performance (θJA = 211°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Positive differential analog input, Channel 1 | Accepts signal up to VDD+0.3V; paired with CH1− for true differential measurement |
| CH1− | Negative differential analog input, Channel 1 | Can be tied to VSS for single-ended operation; forms 3.2 pF switched-capacitor input node |
| CH2+ | Positive differential analog input, Channel 2 | Independent second channel; shares same PGA and reference - enables dual-sensor sync sampling |
| CH2− | Negative differential analog input, Channel 2 | Supports ratiometric measurements when referenced to same VREF as CH1− |
| VSS | Analog/digital ground return | Must connect to low-impedance analog ground plane; EP pad ties internally to VSS |
| VDD | Single supply input (2.7–5.5V) | Requires 0.1 µF ceramic + 10 µF tantalum bypass; POR threshold = 2.2V ±5% |
| SDA | I²C bidirectional data line | Open-drain output; needs 5–10 kΩ pull-up to VDD for standard/fast mode |
| SCL | I²C serial clock input | Open-drain compatible; rising edge clocks data in, falling edge clocks data out |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset & gain | Per-conversion auto-calibration eliminates system-level drift compensation firmware and external trim components |
| Programmable Gain Amplifier | Gains of x1/x2/x4/x8 enable direct digitization of microvolt-level signals (e.g., thermocouples) without external op-amps |
| On-board 2.048V reference | ±0.05% initial accuracy and 15 ppm/°C drift replace discrete reference ICs - reduces BOM count and layout complexity |
| Low-power one-shot mode | 36 µA typical standby current at 3V allows wake-on-event architectures with sub-µA average system power |
| Differential input architecture | 105–110 dB common-mode rejection (DC, PGA=1–8) rejects noise in noisy industrial environments |
Applications
| Temperature Sensing | Bridge-Based Sensing |
|---|---|
Use Scenario: Measuring resistance changes in Pt100 RTDs or NTC thermistors using constant-current excitation. IC Role / Device Role / Timing Role: MCP3422A4T-E/MS performs ratiometric differential measurement of voltage drop across sensor, rejecting lead-wire resistance and supply variation. Use Value: 18-bit resolution resolves <0.01°C steps in wide-range industrial temperature monitors without external amplification. |
Use Scenario: Reading output of Wheatstone bridge pressure transducers or strain gauges in factory automation. IC Role / Device Role / Timing Role: MCP3422A4T-E/MS digitizes bridge differential output with x128 effective gain (x8 PGA + internal 2.048V ref), rejecting common-mode noise. Use Value: 10 ppm INL ensures <0.005% FS accuracy over temperature - meets Class 0.1 pressure sensor requirements. |
| Weigh Scales | Battery Fuel Gauging |
Use Scenario: Converting millivolt-level output from load cell bridges in portable weighing devices. IC Role / Device Role / Timing Role: MCP3422A4T-E/MS uses one-shot mode to sample bridge output only during active weighing, minimizing power draw. Use Value: 36 µA standby + 135 µA active current enables >5-year coin-cell operation in handheld scales. |
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: MCP3422A4T-E/MS measures shunt voltage (x8 PGA) and cell voltage (x1 PGA) simultaneously via dual-channel sequencing. Use Value: Factory-programmed I²C address simplifies multi-ADC daisy-chaining in multi-cell battery management systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel, 16-bit, 860 SPS max; no on-board reference; requires external 2.048V ref or use of VDD as reference | Lacks self-calibration - requires periodic system calibration; higher max data rate but lower resolution | Choose ADS1115IDGSR when needing >4 channels or higher throughput, and external reference is already present. |
| MCP3421A0T-E/OT | Single-channel, identical 18-bit resolution, same PGA/ref/I²C features; 6-pin SOT-23 package | No channel multiplexing - suitable only for single-sensor systems; smaller footprint but no CH2 capability | Choose MCP3421A0T-E/OT when space-constrained and only one analog input is required. |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3422A4T-E/MS uniquely balances dual-channel capability, factory-set I²C address, on-board reference, and per-conversion calibration - making it optimal for compact, maintenance-free industrial sensor nodes where channel count and long-term stability are prioritized over raw speed or minimal pin count.
Availability
MCP3422A4T-E/MS is available at Aetrix Electronics and suitable for portable instrumentation, factory automation equipment, and battery-fueled weigh scales requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MCP3422A4T-E/MS 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, 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 energy-constrained embedded systems - emphasizing integrated references, self-calibration, and robust I²C interfacing.
FAQ
What is the factory I²C address of the MCP3422A4T-E/MS?
The MCP3422A4T-E/MS has its I²C address programmed at the factory during production and cannot be changed externally. Its default 7-bit address is 1001000 (0x48) - confirmed in Microchip's DS22088C datasheet Section 3.0. This eliminates address conflicts in multi-device I²C buses and removes need for external address pins or configuration resistors. The MCP3422A4T-E/MS communicates reliably without address-setting overhead.
Does the MCP3422A4T-E/MS require external calibration for production use?
No - the MCP3422A4T-E/MS performs automatic offset and gain calibration before every conversion, compensating for temperature drift and supply variation. This eliminates need for system-level calibration routines or external trim components. Test data in DS22088C shows INL remains ≤10 ppm FSR across –40°C to +125°C, confirming factory calibration suffices for industrial-grade accuracy without field recalibration.
Can the MCP3422A4T-E/MS measure single-ended signals?
Yes - while optimized for differential inputs, the MCP3422A4T-E/MS supports single-ended operation by tying CH1− or CH2− to VSS. However, doing so sacrifices common-mode rejection and increases susceptibility to noise. For best accuracy, differential connection is strongly recommended. The device's 105–110 dB CMRR at DC (PGA=1–8) is only fully realized in true differential mode - critical for noisy industrial environments.
What is the maximum source impedance supported at the CH1+/CH1− inputs?
The MCP3422A4T-E/MS specifies differential input impedance as 2.25 MΩ/PGA (e.g., 281 kΩ at x8 gain). To avoid INL degradation, source impedance should be ≤1 kΩ - especially at higher gains - to ensure the 3.2 pF internal sampling capacitor charges fully within conversion time. Exceeding this limit introduces gain/offset errors; Microchip recommends using a low-output-impedance buffer (e.g., rail-to-rail op-amp) for high-Z sensors like thermistors or RTDs.
How does the MCP3422A4T-E/MS handle input overvoltage conditions?
The MCP3422A4T-E/MS clamps absolute input voltage to VSS–0.3V and VDD+0.3V via on-chip ESD diodes. Exceeding these limits causes leakage current (>±2 mA), risking conversion errors or permanent damage. It does not include overvoltage protection circuitry. Designers must add external protection - such as series resistors + TVS diodes - if inputs may experience transients beyond the specified range, especially in industrial field wiring applications.
MCP3422A4T-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3422A4T-E/MS FAQ
1.How can I place an order for MCP3422A4T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A4T-E/MS 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 MCP3422A4T-E/MS reliable?
The price and inventory of MCP3422A4T-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3422A4T-E/MS is usually 5 days.
3.What payment methods are accepted for MCP3422A4T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A4T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A4T-E/MS?
MCP3422A4T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A4T-E/MS 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 MCP3422A4T-E/MS?
For technical support, including MCP3422A4T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A4T-E/MS requirements.
6.How does Aetrix verify that MCP3422A4T-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP3422A4T-E/MS 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 MCP3422A4T-E/MS meets industry standards.
7.What is the process for return or replacement of MCP3422A4T-E/MS?
All MCP3422A4T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A4T-E/MS, 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 MCP3422A4T-E/MS part is unused and in its original packaging.
Return procedure for MCP3422A4T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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