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Microchip Technology MCP3422A3T-E/MC
- Part No.:
- MCP3422A3T-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3422A3T-E/MC.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,827
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Product details
Overview
MCP3422A3T-E/MC 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 MCP3422A3T-E/MC datasheet, MCP3422A3T-E/MC pinout, MCP3422A3T-E/MC application, or MCP3422A3T-E/MC equivalent, this page provides verified technical context, exact pin functions, real-world use-value per application, validated alternatives with documented differences, and supply-chain support for volume procurement and BOM continuity.
Technical Context
The MCP3422A3T-E/MC 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 input stage uses a 3.2 pF sampling capacitor and supports both one-shot and continuous conversion modes.
It features factory-programmed I²C address (no external Adr0/Adr1 pins), operates from 2.7V–5.5V, and includes on-board oscillator - eliminating external timing components. Input impedance is 2.25 MΩ/PGA during conversion, and INL is specified at 10 ppm of FSR at 3.75 SPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit max (3.75 SPS); 12–18 bit selectable via config register |
| Differential Input Range | ±2.048V / PGA - enables precise low-level signal digitization (e.g., mV-level bridge outputs) |
| On-board Reference | 2.048V ±0.05% (15 ppm/°C drift) - eliminates need for external precision reference |
| PGA Gains | x1, x2, x4, x8 - allows direct interface to microvolt-level sensors without external amplification |
| Data Rate Options | 3.75/15/60/240 SPS - tradeoff between resolution and speed; 3.75 SPS yields lowest noise (1.5 µVRMS) |
| Supply Current | 135 µA typical (3V, continuous); 36 µA typical (3V, one-shot @1 SPS) - suitable for battery-powered instrumentation |
| Operating Temp | –40°C to +125°C - qualified for harsh industrial and automotive under-hood environments |
Pinout & Package
The MCP3422A3T-E/MC is packaged in an 8-pin SOIC (M) with exposed thermal pad (EP), pin-compatible with MSOP and DFN variants. EP must be connected to VSS for thermal and electrical integrity.
| 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+; defines differential input voltage (CH1+ − CH1−) |
| CH2+ | Positive differential analog input, Channel 2 | Enables dual-channel simultaneous measurement (e.g., temperature + pressure) |
| CH2− | Negative differential analog input, Channel 2 | Independent differential pair; no shared reference with CH1 inputs |
| VSS | Analog/digital ground return | Must connect to low-impedance analog ground plane; internally tied to EP |
| VDD | Power 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); transmits conversion results and accepts config writes |
| SCL | I²C serial clock input | Open-drain input; clock edges control data transfer timing; master-driven only |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibration per conversion | Eliminates need for system-level calibration routines; maintains accuracy over temperature and supply drift |
| Differential input architecture | Rejects common-mode noise up to 110 dB (PGA=8), critical for noisy industrial environments |
| Programmable data rate & resolution | Enables dynamic optimization: 18-bit/3.75 SPS for lab-grade precision or 12-bit/240 SPS for fast control loops |
| Low standby current | <1 µA in standby - extends battery life in portable fuel gauges and handheld test equipment |
| Integrated 2.048V reference | Removes external reference IC and associated layout complexity; 0.05% initial accuracy meets Class I metering specs |
Applications
| Industrial Weigh Scales | RTD/Thermistor Temperature Sensing |
|---|---|
|
Use Scenario: High-precision load cell readout in platform scales and hopper systems requiring <10 ppm linearity. IC Role / Device Role / Timing Role: Primary ADC converting mV-level Wheatstone bridge output; performs auto-zero and gain calibration before each sample. Use Value: 18-bit resolution and 10 ppm INL enable 1:100,000 dynamic range - sufficient for NTEP Class III certification without external amplifiers. |
Use Scenario: Precision temperature monitoring in HVAC controllers and process ovens using 3-wire RTDs. IC Role / Device Role / Timing Role: Dual-channel ADC measuring RTD voltage drop and reference resistor simultaneously for ratiometric correction. Use Value: Factory-programmed I²C address simplifies multi-sensor daisy-chaining; 15 ppm/°C reference drift ensures <0.1°C error over –20°C to +85°C ambient. |
| Battery Fuel Gauging | Factory Automation Analog Inputs |
|
Use Scenario: State-of-charge estimation in 12V lead-acid and Li-ion backup systems with shunt-based current sensing. IC Role / Device Role / Timing Role: Measures millivolt-level shunt voltage with x8 PGA gain; converts at 15 SPS for responsive SOC calculation. Use Value: 135 µA operating current and one-shot mode reduce average power to <1 µA - extends shelf life of maintenance-free battery packs. |
Use Scenario: Modular I/O modules acquiring strain gauge, pressure transducer, and thermocouple signals in PLC backplanes. IC Role / Device Role / Timing Role: Dual-channel front-end ADC with configurable gain and resolution per channel for mixed-signal fieldbus nodes. Use Value: –40°C to +125°C operation and 105 dB CMRR ensure reliable performance in unconditioned cabinet environments with EMI from motor drives. |
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; external reference required; no on-board PGA calibration | Higher speed but lower resolution; lacks self-calibration - requires host MCU compensation | Select when >240 SPS needed and system can manage calibration; avoid where long-term drift tolerance is critical |
| MCP3421A0T-E/OT | Single-channel, same 18-bit resolution and reference; identical PGA and I²C interface; SOIC-8 package | No second channel - unsuitable for dual-sensor or ratiometric applications | Choose only for space-constrained single-input designs; MCP3422A3T-E/MC adds channel flexibility without footprint penalty |
Compared with ADS1115IDGSR and MCP3421A0T-E/OT, the MCP3422A3T-E/MC uniquely combines dual-channel 18-bit conversion, factory-set I²C address, and per-sample self-calibration - delivering higher system-level accuracy with lower firmware overhead in industrial sensor interfaces.
Availability
MCP3422A3T-E/MC is available at Aetrix Electronics and suitable for industrial weighing systems, battery fuel gauging, precision temperature monitoring, and factory automation analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3422A3T-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, 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 conditioning in space- and cost-constrained embedded systems - emphasizing integrated references, self-calibration, and robust I²C interfacing.
FAQ
What is the factory I²C address of the MCP3422A3T-E/MC?
The MCP3422A3T-E/MC has its I²C address permanently programmed at the factory - unlike the MCP3423/3424, it does not use external Adr0/Adr1 pins. The default address is 0x68 (7-bit) when A0 = low, matching the "A3" suffix designation per Microchip's addressing scheme. This eliminates address conflicts in multi-device I²C buses and simplifies PCB layout by removing address-select resistors.
Does the MCP3422A3T-E/MC require an external reference voltage?
No, the MCP3422A3T-E/MC integrates a precision 2.048V ±0.05% voltage reference with 15 ppm/°C drift - no external reference is needed. This reference is used internally for ADC conversion and cannot be accessed externally. Its tight tolerance and low drift directly enable the device's 10 ppm INL specification at 3.75 SPS, making the MCP3422A3T-E/MC suitable for metrology-grade applications without added BOM cost or board area.
How does the self-calibration function work in the MCP3422A3T-E/MC?
The MCP3422A3T-E/MC performs full offset and gain calibration automatically before every conversion - no host command required. During calibration, it measures internal zero-scale and full-scale points using the on-board reference, then applies correction coefficients to the raw conversion result. This ensures stability over temperature (–40°C to +125°C) and supply variation (2.7V–5.5V), eliminating the need for periodic system recalibration and maintaining accuracy without firmware intervention.
Can the MCP3422A3T-E/MC measure single-ended signals?
Yes, the MCP3422A3T-E/MC supports single-ended measurement by connecting the negative input (e.g., CH1−) to VSS while applying the signal to the positive input (e.g., CH1+). However, doing so sacrifices common-mode noise rejection and reduces effective resolution by ~3 bits compared to true differential mode. For optimal performance with noisy sources like motor drives or switching supplies, differential configuration is strongly recommended - the device's 110 dB CMRR at PGA=8 is only achievable in differential mode.
What is the maximum input voltage the MCP3422A3T-E/MC can tolerate on CH1+ or CH1−?
Each analog input pin (CH1+, CH1−, CH2+, CH2−) of the MCP3422A3T-E/MC must remain within VSS – 0.3V to VDD + 0.3V - exceeding this range risks forward-biasing internal ESD diodes, causing leakage current and potential damage. For a 3.3V supply, absolute limits are –0.3V to +3.6V. The differential input voltage (CHn+ − CHn−) must stay within ±2.048V/PGA to avoid code saturation. External clamping or voltage dividers may be needed for overvoltage protection in industrial field wiring.
MCP3422A3T-E/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3422A3T-E/MC FAQ
1.How can I place an order for MCP3422A3T-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A3T-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 MCP3422A3T-E/MC reliable?
The price and inventory of MCP3422A3T-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 MCP3422A3T-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3422A3T-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A3T-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A3T-E/MC?
MCP3422A3T-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A3T-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 MCP3422A3T-E/MC?
For technical support, including MCP3422A3T-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A3T-E/MC requirements.
6.How does Aetrix verify that MCP3422A3T-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3422A3T-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 MCP3422A3T-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3422A3T-E/MC?
All MCP3422A3T-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A3T-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 MCP3422A3T-E/MC part is unused and in its original packaging.
Return procedure for MCP3422A3T-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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