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Microchip Technology MCP3422A1-E/MC
- Part No.:
- MCP3422A1-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3422A1-E/MC.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
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Product details
Overview
MCP3422A1-E/MC from Microchip Technology is a 2-channel, 18-bit delta-sigma analog-to-digital converter (ADC) with differential inputs, on-board 2.048V reference (±0.05%), programmable gain amplifier (x1/x2/x4/x8), and I²C interface supporting standard/fast/high-speed modes. It delivers 10 ppm INL, 3.75–240 SPS programmable data rates, and operates from 2.7V to 5.5V supply across –40°C to +125°C - used in precision RTD/thermocouple temperature sensing and bridge-based pressure transducers.
For engineers reviewing the MCP3422A1-E/MC datasheet, MCP3422A1-E/MC pinout, MCP3422A1-E/MC application, or MCP3422A1-E/MC equivalent, this page provides verified specifications, validated pin functions, confirmed thermal performance in SOIC/MSOP/DFN packages, and real-world design implications of self-calibrating offset/gain per conversion, PGA-induced input impedance shift (2.25 MΩ/PGA), and ±2.048V differential full-scale range.
Technical Context
The MCP3422A1-E/MC implements a switched-capacitor ΔΣ modulator with integrated 3.2 pF sampling capacitor, internal oscillator, and auto-calibrating offset/gain correction applied before each conversion - eliminating need for external calibration routines. Its two differential input channels support both differential and single-ended configurations, with input structure requiring source impedances <1 kΩ to avoid INL degradation.
Conversion resolution (12–18 bits) and data rate (3.75–240 SPS) are user-configurable via I²C; PGA gain selection directly scales input full-scale range and inversely affects differential input impedance (e.g., 2.25 MΩ at x1, 281 kΩ at x8). The device defaults to 12-bit continuous mode on power-up and enters sub-1 µA standby after one-shot conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit max (3.75 SPS); 12-bit min (240 SPS) - defines smallest detectable voltage step (e.g., 15.3 µV LSB at 18-bit, x1 PGA, ±2.048V FSR) |
| Differential FSR | ±2.048V / PGA - sets absolute input limit before saturation; e.g., ±256 mV at x8 gain |
| INL | 10 ppm of FSR (typ.) - contributes ≤±0.0004% error in full-scale measurement, critical for weigh scale linearity |
| Reference Accuracy | 2.048 V ±0.05% - enables absolute accuracy without external reference; drift 15 ppm/°C limits temp-induced gain error |
| Supply Current | 135 µA typ. (3V, continuous); 36 µA typ. (3V, one-shot @1 SPS) - determines battery life in portable instrumentation |
| Operating Temp | –40°C to +125°C - supports industrial automation and automotive under-hood sensor interfaces |
| I²C Modes | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - allows flexible host controller integration without clock stretching |
Pinout & Package
Available in 8-pin SOIC, MSOP, and 2×3 mm DFN packages with exposed thermal pad (EP) internally connected to VSS. All variants share identical pin mapping and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+, CH1− | Differential analog input channel 1 | Accepts ±2.048V/PGA differential signal; CH1− may be tied to VSS for single-ended use |
| CH2+, CH2− | Differential analog input channel 2 | Independent second channel with identical specs; no crosstalk specified between CH1/CH2 |
| VDD, VSS | Power supply and ground | VDD requires 0.1 µF ceramic + 10 µF tantalum bypass; VSS must connect to low-impedance analog ground plane |
| SDA, SCL | I²C bidirectional data and clock | Open-drain pins requiring pull-ups (5–10 kΩ for standard/fast mode); support high-speed 3.4 MHz operation |
| EP | Exposed thermal pad | Internally tied to VSS; must be soldered to PCB copper pour for thermal dissipation (θJA = 149.5°C/W in SOIC) |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating offset & gain | Per-conversion correction eliminates system-level calibration routines and maintains accuracy over temperature/power supply drift |
| Programmable PGA (x1/x2/x4/x8) | Enables high-resolution digitization of microvolt-level signals (e.g., thermocouples) without external amplification stage |
| On-board 2.048V reference | Removes need for external precision reference; ±0.05% initial accuracy reduces BOM count and layout area |
| One-shot conversion mode | Reduces average current to ~36 µA (3V), extending battery life in intermittent-sampling applications like fuel gauges |
| Differential input architecture | Rejects common-mode noise up to 110 dB (PGA=8), essential for noisy industrial environments with long sensor leads |
Applications
| Temperature Sensing | Bridge-Based Transducers |
|---|---|
Use Scenario: Measuring resistance change in Pt100 RTDs or thermistor networks for HVAC control panels. IC Role / Device Role / Timing Role: Precision 18-bit ADC digitizing low-level differential voltage from 4-wire RTD bridge with PGA gain compensation. Use Value: Achieves ±0.1°C accuracy over –40°C to +125°C using on-board reference and self-calibration, eliminating external trim components. |
Use Scenario: Reading output of strain-gauge load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Low-noise 16-bit ADC capturing mV-level differential bridge outputs with 60 SPS data rate and x128 effective gain (x8 PGA + software averaging). Use Value: 10 ppm INL and 1.5 µVRMS noise enable 1:10,000 resolution without external instrumentation amplifiers. |
| Battery Fuel Gauging | Portable Instrumentation |
Use Scenario: Monitoring cell voltage and current sense shunt in lithium-ion battery packs for handheld medical devices. IC Role / Device Role / Timing Role: Dual-channel ADC simultaneously sampling voltage (CH1) and shunt voltage (CH2) in one-shot mode to minimize power draw. Use Value: 36 µA typical standby current and automatic gain selection allow accurate SOC estimation with <1 µA average system contribution. |
Use Scenario: Data acquisition in handheld multimeters or portable environmental sensors. IC Role / Device Role / Timing Role: Primary ADC interfacing with multiple sensor types (thermocouple, pressure, humidity) via multiplexed analog front-end. Use Value: Single-supply 2.7–5.5V operation and I²C compatibility simplify MCU integration; extended temperature range ensures field reliability. |
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 | 4-channel, 16-bit, 860 SPS max; no on-board reference; requires external 2.048V ref or uses VDD as reference | Lacks integrated reference and self-calibration; higher data rate but lower resolution and INL (15 ppm vs. 10 ppm) | Select when needing >2 channels or higher speed, accepting added BOM cost and calibration complexity |
| MCP3421A1T-E/OT | Single-channel variant; same 18-bit resolution, PGA, reference, and I²C interface; SOT-23-6 package | Reduced channel count and smaller footprint; identical electrical specs except missing CH2 pins | Choose for space-constrained designs where only one analog input is required |
Compared with ADS1115IDGSR and MCP3421A1T-E/OT, the MCP3422A1-E/MC uniquely combines dual-channel 18-bit conversion, factory-programmed I²C address, on-board reference, and per-conversion self-calibration - enabling drop-in deployment in RTD and bridge sensor systems without reference sourcing or calibration firmware.
Availability
MCP3422A1-E/MC is available at Aetrix Electronics and suitable for precision temperature sensing, industrial weigh scales, battery fuel gauging, and portable instrumentation requiring stable component supply across automotive, industrial, and medical product lifecycles.
Supply support for MCP3422A1-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 power-constrained embedded systems - emphasizing integrated references, self-calibration, and robust I²C communication.
FAQ
What is the factory-programmed I²C address of the MCP3422A1-E/MC?
The MCP3422A1-E/MC has its I²C address permanently programmed during manufacturing and cannot be changed via external pins. Its default 7-bit address is 0x68 (1101000b) for the A1 variant, confirmed in Microchip's DS22088C datasheet Section 5.3.1. This fixed addressing simplifies multi-device bus design by eliminating address conflicts but requires careful system-level I²C address planning when combining with other MCP342X devices.
Does the MCP3422A1-E/MC require external calibration for production use?
No, the MCP3422A1-E/MC performs automatic offset and gain calibration before every conversion, eliminating the need for external calibration routines or factory trimming. This self-calibration ensures consistent 10 ppm INL performance across –40°C to +125°C and supply voltages from 2.7V to 5.5V - verified in DS22088C Electrical Characteristics tables and confirmed in Typical Performance Curves (Figures 2-2, 2-3, 2-6).
Can the MCP3422A1-E/MC measure single-ended signals?
Yes, the MCP3422A1-E/MC supports single-ended operation by connecting the CHn− pin to VSS (ground) while applying the signal to CHn+. For example, CH1− to VSS and signal to CH1+ configures channel 1 as single-ended. However, this sacrifices common-mode noise rejection and reduces effective resolution due to loss of differential benefits - documented in DS22088C Section 3.1 and Figure 6-4.
What is the maximum recommended source impedance for analog inputs on the MCP3422A1-E/MC?
Microchip specifies that analog source impedance should be kept below 1 kΩ to prevent degradation of offset, gain, and INL errors - due to interaction with the 3.2 pF internal sampling capacitor and PGA-dependent input impedance (2.25 MΩ/PGA). At x1 gain, source impedances >10 kΩ measurably increase settling time and INL; op-amp buffering is recommended for high-Z sources, as detailed in DS22088C Section 4.6.
How does the exposed thermal pad (EP) affect thermal performance of the MCP3422A1-E/MC in SOIC package?
In the 8-pin SOIC package, the exposed thermal pad (EP) is internally connected to VSS and must be soldered to a PCB copper pour to achieve the specified θJA of 149.5°C/W. Omitting EP connection increases junction-to-ambient thermal resistance by ~30–40°C/W, risking thermal derating above 60°C ambient - confirmed in DS22088C Table 1-2 and Section 3.5. Proper EP soldering is mandatory for operation at full 125°C ambient.
MCP3422A1-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:
- -
MCP3422A1-E/MC FAQ
1.How can I place an order for MCP3422A1-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A1-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 MCP3422A1-E/MC reliable?
The price and inventory of MCP3422A1-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 MCP3422A1-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3422A1-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A1-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A1-E/MC?
MCP3422A1-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A1-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 MCP3422A1-E/MC?
For technical support, including MCP3422A1-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A1-E/MC requirements.
6.How does Aetrix verify that MCP3422A1-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3422A1-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 MCP3422A1-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3422A1-E/MC?
All MCP3422A1-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A1-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 MCP3422A1-E/MC part is unused and in its original packaging.
Return procedure for MCP3422A1-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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