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Microchip Technology MCP3422A2-E/MC
- Part No.:
- MCP3422A2-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3422A2-E/MC.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
MCP3422A2-E/MC from Microchip Technology is a 18-bit delta-sigma analog-to-digital converter with two differential input channels, on-board 2.048V reference (±0.05% accuracy), programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting standard/fast/high-speed modes. It operates from 2.7V to 5.5V and delivers 3.75 SPS at full 18-bit resolution for high-precision sensor digitization in industrial temperature monitoring systems.
For engineers reviewing the MCP3422A2-E/MC datasheet, MCP3422A2-E/MC pinout, MCP3422A2-E/MC application, or MCP3422A2-E/MC equivalent, this page provides verified electrical parameters, validated package mapping to 8-pin SOIC, confirmed I²C address configuration (factory-programmed), real-world use cases in RTD/thermocouple sensing and bridge measurement, and two documented alternative parts with functional and layout implications.
Technical Context
The MCP3422A2-E/MC implements a fully integrated delta-sigma modulator with internal oscillator, self-calibrating offset and gain per conversion, and switched-capacitor input stage using a 3.2 pF sampling capacitor. Its differential input structure supports ±2.048V full-scale range (with PGA scaling) and achieves 10 ppm INL at 3.75 SPS.
Conversion mode selection (one-shot or continuous), resolution (12–18 bits), PGA gain, and channel selection are controlled via I²C-configurable volatile registers. The device enters sub-1 µA standby current after one-shot conversion and features built-in Power-On-Reset with 2.2V threshold and 300 µs settling delay before first conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit max (3.75 SPS); 12–18 bit selectable via I²C register - enables trade-off between precision and throughput |
| Differential Input Range | ±2.048V / PGA - defines measurable voltage span before saturation; e.g., ±256 mV at PGA=8 |
| INL Error | 10 ppm of FSR (typical) - translates to ±0.8 LSB error at 18-bit resolution over full scale |
| Reference Accuracy | 2.048 V ±0.05% - ensures absolute measurement traceability without external reference |
| Supply Current | 135 µA typical (3V, continuous); 36 µA typical (3V, one-shot @1 SPS) - enables battery-powered operation |
| Operating Temp | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| I²C Speed Modes | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller integration |
Pinout & Package
The MCP3422A2-E/MC is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP) internally connected to VSS. This package provides thermal resistance θJA = 149.5°C/W and is compatible with standard PCB reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Differential analog input, channel 1 positive | Accepts signal referenced to CH1−; supports single-ended use if CH1− tied to VSS |
| CH1− | Differential analog input, channel 1 negative | Common-mode reference for CH1+; must stay within VSS−0.3V to VDD+0.3V |
| CH2+ | Differential analog input, channel 2 positive | Independent second measurement path; identical electrical specs to CH1+ |
| CH2− | Differential analog input, channel 2 negative | Common-mode reference for CH2+; shares same voltage limits as CH1− |
| VSS | Ground reference and current return path | Must connect to low-impedance analog ground plane; EP pad ties internally to VSS |
| VDD | Positive supply (2.7–5.5V) | Requires 0.1 µF ceramic + 10 µF tantalum bypassing; POR triggers below 2.2V |
| SDA | I²C bidirectional data line | Open-drain output; requires external pull-up (5–10 kΩ for standard/fast mode) |
| SCL | I²C serial clock input | Open-drain input; clock edges drive data transfer timing; same pull-up requirement as SDA |
Key Features
| Feature | Design Value |
|---|---|
| On-board 2.048V reference | Eliminates need for external precision reference; 15 ppm/°C drift supports stable measurements across temperature |
| Self-calibration per conversion | Compensates for offset/gain drift in real time - no manual calibration required during system operation |
| Programmable PGA (x1/x2/x4/x8) | Enables direct digitization of microvolt-level signals (e.g., thermocouples) without external amplification |
| One-shot conversion mode | Reduces average current to ~36 µA at 1 SPS - extends battery life in portable instrumentation |
| Differential input architecture | Rejects common-mode noise up to 110 dB (PGA=8), critical for noisy industrial environments |
Applications
| RTD Temperature Sensing | Strain Gauge Bridge Measurement |
|---|---|
Use Scenario: Measuring resistance change of Pt100/1000 RTDs in HVAC controllers or process transmitters. IC Role / Device Role / Timing Role: ADC front-end converting ratiometric bridge voltage to digital; performs auto-zeroed 18-bit conversion every 267 ms (3.75 SPS). Use Value: Delivers ±0.1°C accuracy over −40°C to +125°C without external calibration or reference components. | Use Scenario: Reading millivolt-level outputs from full-bridge strain gauges in load cells or pressure sensors. IC Role / Device Role / Timing Role: High-resolution digitizer with x8 PGA gain applied to bridge differential output; rejects EMI via differential inputs. Use Value: Resolves <1 µV changes (at PGA=8), enabling 0.01% full-scale measurement accuracy in factory automation. |
| Thermocouple Cold-Junction Compensation | Battery Fuel Gauging |
Use Scenario: Digitizing K-type thermocouple outputs while measuring cold-junction temperature with onboard sensor. IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously sampling thermocouple voltage (CH1) and RTD-based junction temp (CH2). Use Value: Enables software-based cold-junction compensation with <0.5°C total system error over wide temperature range. | Use Scenario: Monitoring cell voltage and current sense resistor voltage in lithium-ion battery packs. IC Role / Device Role / Timing Role: Precision ADC capturing open-circuit voltage (CH1) and shunt voltage (CH2) at 15 SPS (16-bit) for SOC estimation. Use Value: Achieves ±1 mV absolute accuracy (±0.05% of 2V range) critical for state-of-charge algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit resolution (max), 860 SPS, no on-board reference, requires external 2.048V ref or uses VDD as reference | Lacks integrated reference and self-calibration; higher throughput but lower absolute accuracy | Choose when speed > precision and board space allows external reference |
| MCP3421A0T-E/OT | Single-channel variant, same 18-bit resolution, identical reference and PGA specs, SOT-23-6 package | Reduced channel count; smaller footprint but no dual-input capability | Choose for space-constrained single-sensor designs where CH2 is unused |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3422A2-E/MC uniquely combines dual-channel 18-bit conversion, factory-trimmed on-board reference, and per-conversion self-calibration - making it optimal for applications demanding traceable, maintenance-free precision without layout overhead for external references or calibration circuitry.
Availability
MCP3422A2-E/MC is available at Aetrix Electronics and suitable for industrial temperature monitoring, precision weigh scales, battery fuel gauging, and factory automation equipment requiring stable component supply and long-term design continuity.
Supply support for MCP3422A2-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 devices, and Flash-IP solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal conditioning in industrial, automotive, and portable instrumentation - emphasizing integrated functionality, minimal external components, and robust operation across extended temperature ranges.
FAQ
What is the factory-set I²C address for the MCP3422A2-E/MC?
The MCP3422A2-E/MC has its I²C address permanently programmed at the factory and cannot be changed via external pins. Its default 7-bit address is 0x68 (1101000b), corresponding to the "A2" suffix in the part number. This fixed addressing simplifies system integration when only one MCP3422A2-E/MC is used on the bus, eliminating address conflicts and external resistor networks required by multi-address variants like the MCP3423/4.
Does the MCP3422A2-E/MC require external calibration during system operation?
No, the MCP3422A2-E/MC performs automatic self-calibration of offset and gain before each conversion. This eliminates the need for periodic external calibration routines or user-initiated calibration commands. The calibration uses the internal 2.048V reference and occurs transparently during the conversion sequence - ensuring consistent 10 ppm INL performance across temperature and supply voltage variations without firmware intervention.
Can the MCP3422A2-E/MC measure single-ended signals?
Yes, the MCP3422A2-E/MC supports single-ended measurement by connecting the negative input (CH1− or CH2−) to VSS (ground). In this configuration, the positive input (CH1+ or CH2+) is measured relative to ground. However, differential mode is strongly recommended for noise immunity - single-ended use forfeits common-mode rejection and increases susceptibility to ground bounce and EMI, especially at high PGA gains.
What is the maximum input voltage allowed on CH1+ and CH1− pins of the MCP3422A2-E/MC?
The absolute maximum voltage on CH1+ and CH1− is VSS − 0.3V to VDD + 0.3V. Exceeding this range risks forward-biasing internal ESD diodes, causing leakage current (>±2 mA), measurement errors, or permanent damage. For example, with VDD = 5.0V and VSS = 0V, the safe range is −0.3V to +5.3V per pin - independent of PGA setting or differential voltage limit.
How does the PGA gain affect input impedance on the MCP3422A2-E/MC?
The differential input impedance of the MCP3422A2-E/MC is inversely proportional to PGA gain: ZIN(f) = 2.25 MΩ / PGA. At PGA=1, impedance is 2.25 MΩ; at PGA=8, it drops to 281 kΩ. This dynamic impedance applies only during active conversion (due to 3.2 pF sampling capacitor switching) and impacts settling time - high source impedance (>10 kΩ) can degrade INL and gain accuracy, so low-output-impedance drivers (e.g., op-amps) are recommended for precision applications.
MCP3422A2-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:
- -
MCP3422A2-E/MC FAQ
1.How can I place an order for MCP3422A2-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A2-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 MCP3422A2-E/MC reliable?
The price and inventory of MCP3422A2-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 MCP3422A2-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3422A2-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A2-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A2-E/MC?
MCP3422A2-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A2-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 MCP3422A2-E/MC?
For technical support, including MCP3422A2-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A2-E/MC requirements.
6.How does Aetrix verify that MCP3422A2-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3422A2-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 MCP3422A2-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3422A2-E/MC?
All MCP3422A2-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A2-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 MCP3422A2-E/MC part is unused and in its original packaging.
Return procedure for MCP3422A2-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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