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Microchip Technology MCP3422A4T-E/MC
- Part No.:
- MCP3422A4T-E/MC
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP3422A4T-E/MC.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,774
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Product details
Overview
MCP3422A4T-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 sensor signal acquisition in industrial instrumentation.
For engineers reviewing the MCP3422A4T-E/MC datasheet, MCP3422A4T-E/MC pinout, MCP3422A4T-E/MC application, or MCP3422A4T-E/MC equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Microchip's DS22088C specification.
Technical Context
The MCP3422A4T-E/MC implements a delta-sigma modulation architecture with integrated self-calibrating offset/gain correction per conversion, eliminating need for external calibration. Its switched-capacitor front-end uses a 3.2 pF sampling capacitor and supports differential or single-ended inputs per channel.
It integrates an on-board oscillator, 2.048V reference (15 ppm/°C drift), and PGA with matched gain error ≤0.1% between settings. Conversion modes include one-shot (≤1 µA standby) and continuous, with data rates tightly coupled to resolution: 3.75 SPS (18-bit), 15 SPS (16-bit), 60 SPS (14-bit), 240 SPS (12-bit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit effective (no missing codes), with selectable 12/14/16/18-bit modes tied directly to data rate |
| Differential Input Range | ±2.048V / PGA - enables ±2.048V full-scale differential measurement with gain scaling |
| INL Error | 10 ppm of FSR (typical) - ensures <0.0004% linearity error over full scale at 3.75 SPS |
| Supply Voltage | 2.7V to 5.5V single supply - compatible with 3.3V and 5V systems without level-shifting |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| I²C Interface | Standard (100 kHz), Fast (400 kHz), High-Speed (3.4 MHz) - supports flexible host controller timing budgets |
| Current Consumption | 135 µA typ. (3V, continuous); 36 µA typ. (3V, one-shot @1 SPS) - enables battery-powered portable designs |
Pinout & Package
The MCP3422A4T-E/MC is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed thermal pad (EP), pin-compatible with MSOP and DFN variants. Thermal resistance θJA = 149.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ | Positive differential analog input, Channel 1 | Accepts voltage relative to CH1−; supports single-ended use when CH1− tied to VSS |
| CH1− | Negative differential analog input, Channel 1 | Reference node for CH1+; common-mode range must stay within VSS–0.3V to VDD+0.3V |
| CH2+ | Positive differential analog input, Channel 2 | Independent second channel; identical electrical behavior to CH1+ with same input constraints |
| CH2− | Negative differential analog input, Channel 2 | Reference node for CH2+; shares same absolute voltage limits as CH1− |
| VSS | Analog/digital ground reference | Must connect to low-impedance ground plane; EP pad electrically tied to VSS |
| VDD | Positive supply rail | Requires 0.1 µF ceramic + 10 µF tantalum bypassing; powers internal reference, PGA, and ADC core |
| SDA | I²C bidirectional data line | Open-drain output/input; requires external pull-up (5–10 kΩ for standard/fast mode) |
| SCL | I²C serial clock input | Open-drain input only; clock edges control data transfer timing per I²C protocol |
Key Features
| Feature | Design Value |
|---|---|
| On-board 2.048V reference | ±0.05% initial accuracy and 15 ppm/°C drift - eliminates external reference component and layout area |
| Programmable Gain Amplifier | Gains of x1/x2/x4/x8 with ≤0.1% gain match error - enables high-resolution measurement of µV-level sensor outputs |
| Self-calibration per conversion | Automatic offset/gain correction at each sample - maintains accuracy across temperature and supply variations without host intervention |
| Differential input architecture | 105–110 dB CMRR (DC, PGA=1–8) - rejects common-mode noise from long sensor traces or noisy power domains |
| Low-power standby mode | <1 µA max current - reduces system energy consumption during idle intervals in portable or duty-cycled applications |
Applications
| Temperature Sensing | Bridge-Based Sensing |
|---|---|
Use Scenario: RTD or thermistor measurements in HVAC controllers and industrial process monitors. IC Role / Device Role / Timing Role: High-precision digitization of low-level resistance-derived voltage signals with rejection of lead-wire noise. Use Value: 18-bit resolution and 10 ppm INL enable ±0.02°C temperature accuracy over –40°C to +125°C without external calibration. |
Use Scenario: Strain gauge or load cell readout in weigh scales and factory automation equipment. IC Role / Device Role / Timing Role: Differential acquisition of mV-level bridge outputs with programmable gain to maximize dynamic range utilization. Use Value: PGA x8 setting allows full-scale use of 18-bit range for ±10 mV bridge outputs, improving SNR by >15 dB vs. fixed-gain alternatives. |
| Battery Fuel Gauging | Portable Instrumentation |
Use Scenario: Cell voltage monitoring in multi-cell Li-ion battery packs for UPS and medical devices. IC Role / Device Role / Timing Role: Precision DC voltage measurement with low quiescent current to extend battery runtime. Use Value: 36 µA one-shot current at 1 SPS enables hourly measurements with sub-µAh per-cycle energy cost. |
Use Scenario: Handheld multimeters and environmental sensors requiring compact, calibrated analog front ends. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling for ratiometric or differential sensor pairs (e.g., pressure + temp). Use Value: Factory-programmed I²C address and integrated reference reduce BOM count and calibration labor in volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1120IPWR | 4-channel, SPI interface, no internal reference (requires external 2.048V ref), higher 250 µA active current | Requires external reference and SPI host; better suited for high-channel-count, SPI-based systems | Select ADS1120IPWR when expanding beyond 2 channels or migrating to SPI infrastructure |
| MCP3421A0T-E/OT | Single-channel, same package/pinout but only CH1+, CH1−, VDD, VSS, SDA, SCL - no CH2 pins | Lacks second analog input; identical I²C address and register map - drop-in replacement if only one channel needed | Choose MCP3421A0T-E/OT to reduce cost and board space where dual-channel capability is unused |
Compared with ADS1120IPWR and MCP3421A0T-E/OT, the MCP3422A4T-E/MC uniquely balances dual-channel capability, integrated reference, I²C compatibility, and ultra-low standby current - making it optimal for space-constrained, battery-aware, two-sensor systems requiring minimal external components.
Availability
MCP3422A4T-E/MC is available at Aetrix Electronics and suitable for industrial instrumentation, battery fuel gauging, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP3422A4T-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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP342X series - including the MCP3422A4T-E/MC - was designed specifically for high-accuracy, low-power sensor signal conditioning in industrial, automotive, and portable applications where resolution, stability, and integration matter.
FAQ
What is the factory-programmed I²C address of the MCP3422A4T-E/MC?
The MCP3422A4T-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) when A0 and A1 pins are unconnected - matching the "A4" suffix designation in Microchip's part numbering scheme. This fixed address simplifies system integration where multiple MCP3422 devices are not required on the same bus.
Does the MCP3422A4T-E/MC require external calibration for production use?
No, the MCP3422A4T-E/MC performs automatic self-calibration of offset and gain before every conversion, ensuring accuracy over temperature and supply voltage variations without external calibration steps. This feature is built into the device's operation and applies to all resolution and PGA settings - enabling consistent 10 ppm INL performance in the field without host-initiated calibration routines.
Can the MCP3422A4T-E/MC measure single-ended signals?
Yes, the MCP3422A4T-E/MC supports single-ended measurement by connecting the negative input (CH1− or CH2−) to VSS while applying the signal to the corresponding positive input (CH1+ or CH2+). However, doing so sacrifices common-mode noise rejection and reduces effective resolution by ~3 bits compared to true differential operation - a trade-off explicitly documented in Microchip's DS22088C Section 3.1.
What is the maximum input source impedance supported for accurate 18-bit measurements?
For 18-bit accuracy at 3.75 SPS, Microchip specifies that total input source impedance (including sensor and PCB trace) should be ≤1 kΩ when using PGA = 1. Higher impedances increase settling time and introduce gain/INL errors due to incomplete charging of the 3.2 pF internal sampling capacitor - as detailed in DS22088C Section 4.6. An op-amp buffer is recommended for sources exceeding 500 Ω.
Is the exposed thermal pad (EP) of the MCP3422A4T-E/MC electrically connected?
Yes, the exposed thermal pad (EP) of the MCP3422A4T-E/MC is internally connected to VSS and must be soldered to a VSS copper pour on the PCB for both thermal performance and electrical integrity. Leaving the EP floating violates Microchip's layout guidelines (DS22088C Section 3.5) and risks increased junction temperature, degraded INL, and potential ESD susceptibility - especially in high-temperature industrial deployments.
MCP3422A4T-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:
- -
MCP3422A4T-E/MC FAQ
1.How can I place an order for MCP3422A4T-E/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3422A4T-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 MCP3422A4T-E/MC reliable?
The price and inventory of MCP3422A4T-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 MCP3422A4T-E/MC is usually 5 days.
3.What payment methods are accepted for MCP3422A4T-E/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3422A4T-E/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3422A4T-E/MC?
MCP3422A4T-E/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3422A4T-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 MCP3422A4T-E/MC?
For technical support, including MCP3422A4T-E/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3422A4T-E/MC requirements.
6.How does Aetrix verify that MCP3422A4T-E/MC is sourced from the original manufacturer or authorized distributors?
All MCP3422A4T-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 MCP3422A4T-E/MC meets industry standards.
7.What is the process for return or replacement of MCP3422A4T-E/MC?
All MCP3422A4T-E/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP3422A4T-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 MCP3422A4T-E/MC part is unused and in its original packaging.
Return procedure for MCP3422A4T-E/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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