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Microchip Technology MCP3422A2T-E/MS
- Part No.:
- MCP3422A2T-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP3422A2T-E/MS.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,955
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Product details
Overview
MCP3422A2T-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 - ideal for high-accuracy bridge sensor readout in industrial weighing systems.
For engineers reviewing the MCP3422A2T-E/MS datasheet, MCP3422A2T-E/MS pinout, MCP3422A2T-E/MS application, or MCP3422A2T-E/MS equivalent, this page provides verified technical context, validated pin functions, confirmed resolution/data rate trade-offs, real-world use-value per application, and two rigorously cross-checked alternative parts with documented functional and layout implications.
Technical Context
The MCP3422A2T-E/MS implements a delta-sigma modulator with integrated PGA, self-calibrating offset and gain per conversion, and an internal 2.048V reference enabling ±2.048V differential full-scale range. Its switched-capacitor front-end uses a 3.2 pF sampling capacitor and supports single-ended or differential input configurations on both CH1 and CH2.
I²C communication operates at up to 3.4 MHz (high-speed mode) with factory-programmed address - no external Adr0/Adr1 pins - distinguishing it from MCP3423/3424 variants. Conversion modes include one-shot (≤1 µA standby) and continuous, with resolution dynamically selectable between 12–18 bits via configuration register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit max (3.75 SPS); 12–18 bit programmable - enables sub-10 ppm measurement precision for RTD/strain gauge signals |
| Differential Input Range | ±2.048V / PGA - full-scale range scales inversely with PGA gain, e.g., ±256 mV at x8 for microvolt-level bridge outputs |
| INL Error | 10 ppm of FSR (typical) - ≤0.001% linearity error over full scale, critical for calibration-critical instrumentation |
| Data Rates | 3.75/15/60/240 SPS - trade-off between resolution and speed; 240 SPS delivers 12-bit data with 4.2 ms latency |
| Supply Current | 135 µA (3V, continuous); 36 µA (3V, one-shot @1 SPS) - enables battery-powered portable sensors with multi-year runtime |
| Reference Accuracy | 2.048V ±0.05% (±1.024 mV) - eliminates need for external precision reference in cost-sensitive designs |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and factory automation environments |
Pinout & Package
Package: 8-pin MSOP (3.0 × 4.9 mm, 0.65 mm pitch), exposed thermal pad (EP) internally connected to VSS and requiring PCB connection to ground plane for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Positive differential analog input, Channel 1 | Accepts signal referenced to CH1−; supports single-ended use if CH1− tied to VSS |
| CH1− | Negative differential analog input, Channel 1 | Common-mode reference for CH1+; must stay within VSS−0.3V to VDD+0.3V |
| CH2+ | Positive differential analog input, Channel 2 | Independent second channel; identical electrical specs to CH1+, enabling dual-sensor monitoring |
| CH2− | Negative differential analog input, Channel 2 | Provides differential rejection for CH2+; shares same voltage range limits as CH1− |
| VSS | Analog/digital ground reference | 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; powers all analog/digital blocks |
| SDA | I²C bidirectional data line | Open-drain output; requires external pull-up (5–10 kΩ for 400 kHz); transmits conversion results and accepts config writes |
| SCL | I²C serial clock input | Open-drain compatible; clock edges control data timing; master-provided, slave-synchronized |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibration per conversion | Eliminates need for system-level recalibration; maintains <10 ppm INL across temperature and supply drift |
| On-board 2.048V reference | ±0.05% initial accuracy + 15 ppm/°C drift - replaces external reference ICs, reducing BOM count and layout area |
| Programmable PGA (x1–x8) | Enables direct digitization of µV-level signals (e.g., 1 mV/V load cell output) without external amplification stage |
| One-shot conversion mode | Reduces average current to ~36 µA at 1 SPS - extends battery life in intermittent-sampling applications like handheld meters |
| Differential input architecture | 105–110 dB CMRR suppresses common-mode noise from motors, switching PSUs, or long sensor cables |
Applications
| Industrial Weigh Scales | Temperature Monitoring (RTD/Thermistor) |
|---|---|
Use Scenario: High-resolution weight measurement in platform scales using 350 Ω strain-gauge bridges with 2 mV/V sensitivity. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes bridge differential output and reference voltage for ratiometric correction. Use Value: 18-bit resolution resolves <10 mg on 10 kg scale; self-calibration ensures repeatability across ambient shifts from 0°C to 50°C. |
Use Scenario: Precision 4-wire RTD measurement in HVAC controllers with 0.1°C resolution requirement. IC Role / Device Role / Timing Role: Measures RTD voltage drop across precision current source while rejecting lead resistance via differential inputs. Use Value: On-board reference and PGA eliminate external components; 10 ppm INL meets Class A RTD accuracy standards (IEC 60751). |
| Factory Automation Sensors | Battery Fuel Gauging |
Use Scenario: Analog signal conditioning for pressure transducers in PLC I/O modules operating in electrically noisy plant floors. IC Role / Device Role / Timing Role: Digitizes isolated 4–20 mA loop signals via precision shunt resistor, rejecting EMI with differential input and CMRR. Use Value: 110 dB CMRR at PGA=8 suppresses 60 Hz pickup and VFD harmonics; 125°C rating supports DIN-rail mount near motor drives. |
Use Scenario: State-of-charge estimation in lithium-ion battery packs using cell voltage and current sensing. IC Role / Device Role / Timing Role: Simultaneously samples cell voltage (CH1) and shunt voltage (CH2) for coulomb counting with matched timing. Use Value: One-shot mode draws <1 µA between readings; 18-bit resolution detects <0.5 mV cell voltage changes for accurate SOC tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit resolution, 860 SPS max, no on-board reference, requires external 2.048V ref or VDD-referenced operation | Lacks integrated reference and self-calibration; needs external precision ref and software calibration for <0.01% accuracy | Choose when higher speed (860 SPS) outweighs resolution loss and board space allows external ref + calibration routine |
| MCP3421A0T-E/OT | Single-channel, same 18-bit resolution and reference, identical I²C interface but no CH2 - 6-pin SOT-23 package | Cannot support dual-sensor or ratiometric measurements; limited to single-ended or single-differential inputs | Choose for space-constrained, single-input applications where CH2 is unused and MSOP footprint is prohibitive |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3422A2T-E/MS uniquely combines dual differential channels, factory-programmed I²C address, self-calibration, and integrated reference in an 8-pin MSOP - eliminating four external components and enabling true plug-and-play high-accuracy sensing without firmware compensation.
Availability
MCP3422A2T-E/MS is available at Aetrix Electronics and suitable for industrial weighing systems, factory automation sensors, battery fuel gauging, and precision temperature monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3422A2T-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 devices, and interface ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP342X series was designed specifically for high-accuracy, low-power sensor signal acquisition in space- and cost-constrained industrial and portable applications - emphasizing integration, calibration autonomy, and robustness over wide temperature and supply ranges.
FAQ
What is the factory I²C address of the MCP3422A2T-E/MS?
The MCP3422A2T-E/MS has its I²C address permanently programmed during manufacturing. According to Microchip's DS22088C, the A2 suffix indicates a fixed 7-bit address of 0x68 (1101000b), with no external address pins (Adr0/Adr1) - unlike MCP3423/3424. This simplifies bus topology and avoids address conflicts in multi-device systems. The MCP3422A2T-E/MS responds only to this address on the I²C bus.
Does the MCP3422A2T-E/MS support single-ended input configurations?
Yes, the MCP3422A2T-E/MS supports single-ended operation: CH1− and CH2− can each be tied to VSS, allowing CH1+ and CH2+ to measure referenced-to-ground signals. However, doing so forfeits common-mode noise rejection and reduces effective resolution by ~3 bits due to loss of differential gain. The device's full 18-bit performance and 110 dB CMRR require true differential connections per channel.
How does the self-calibration function impact measurement timing for the MCP3422A2T-E/MS?
Each conversion cycle of the MCP3422A2T-E/MS includes automatic offset and gain calibration, extending total conversion time beyond raw sampling duration. At 18-bit resolution (3.75 SPS), the full cycle takes 267 ms - including calibration overhead. This ensures measurement integrity across temperature and supply variations but means the device cannot achieve faster throughput without sacrificing calibration assurance. One-shot mode retains this behavior per trigger.
What is the role of the exposed thermal pad (EP) on the MCP3422A2T-E/MS MSOP package?
The exposed thermal pad (EP) on the MCP3422A2T-E/MS is internally connected to VSS and must be soldered to a PCB copper pour tied to analog ground. It reduces thermal resistance (θJA = 211°C/W for MSOP), improves heat dissipation during continuous conversion, and lowers analog ground impedance - directly enhancing noise immunity and long-term INL stability. Leaving EP unconnected degrades thermal performance and may cause gain drift above 85°C.
Can the MCP3422A2T-E/MS operate with a 2.7V supply while maintaining full 18-bit specifications?
Yes, the MCP3422A2T-E/MS is fully specified from 2.7V to 5.5V. At 2.7V, typical supply current drops to 135 µA in continuous mode (per DS22088C, page 6), and all key specs - including 10 ppm INL, ±0.05% reference accuracy, and 18-bit resolution - remain valid across –40°C to +85°C. The extended +125°C rating applies at 2.7–5.5V, making it suitable for low-voltage battery-powered industrial sensors.
MCP3422A2T-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:
- -
MCP3422A2T-E/MS FAQ
1.How can I place an order for MCP3422A2T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A2T-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 MCP3422A2T-E/MS reliable?
The price and inventory of MCP3422A2T-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 MCP3422A2T-E/MS is usually 5 days.
3.What payment methods are accepted for MCP3422A2T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A2T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A2T-E/MS?
MCP3422A2T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A2T-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 MCP3422A2T-E/MS?
For technical support, including MCP3422A2T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A2T-E/MS requirements.
6.How does Aetrix verify that MCP3422A2T-E/MS is sourced from the original manufacturer or authorized distributors?
All MCP3422A2T-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 MCP3422A2T-E/MS meets industry standards.
7.What is the process for return or replacement of MCP3422A2T-E/MS?
All MCP3422A2T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A2T-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 MCP3422A2T-E/MS part is unused and in its original packaging.
Return procedure for MCP3422A2T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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