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Microchip Technology MCP3428-E/ST
- Part No.:
- MCP3428-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP3428-E/ST.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
MCP3428-E/ST from Microchip Technology is a 16-bit ΔΣ analog-to-digital converter with four 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 10 ppm INL, 15 SPS at 16-bit resolution, and operates from 2.7V to 5.5V across –40°C to +125°C - used in precision bridge sensing and RTD-based temperature measurement systems.
For engineers reviewing the MCP3428-E/ST datasheet, MCP3428-E/ST pinout, MCP3428-E/ST application, or MCP3428-E/ST equivalent, key selection criteria include differential channel count, self-calibrating offset/gain per conversion, PGA-configurable input range, low-power one-shot mode (0.56 µA at 12-bit), and TSSOP-14 package compatibility with industrial sensor signal chains.
Technical Context
The MCP3428-E/ST implements a delta-sigma modulator with integrated sinc filter, on-chip oscillator, and multiplexer routing CH1–CH4 to a single ADC core. Each conversion triggers automatic offset and gain calibration using the internal 2.048V reference, eliminating external calibration routines.
Its I²C interface supports user-configurable addressing via Adr0/Adr1 pins (8 possible addresses), enabling multi-device bus configurations. The PGA front-end allows full-scale input ranges from ±2.048V (gain=1) down to ±0.256V (gain=8), while maintaining 10 ppm INL and 2.5 µVRMS noise at 15 SPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution & Data Rate | 16-bit @ 15 SPS, 14-bit @ 60 SPS, 12-bit @ 240 SPS - enables trade-off between precision and throughput in battery-powered sensors |
| Differential Input Channels | 4 independent channels (CH1–CH4) - supports simultaneous multi-sensor acquisition without external mux |
| On-board Reference | 2.048V ±0.05%, 15 ppm/°C drift - eliminates need for external precision reference in compact designs |
| PGA Gains | x1, x2, x4, x8 - scales weak signals (e.g., mV-level thermocouple or strain gauge outputs) to full ADC range |
| INL Error | 10 ppm of full scale - ensures <±0.001% linearity critical for weigh scale and process control accuracy |
| Supply Current | 135 µA typical (continuous, VDD=3V); 0.56 µA (one-shot, 12-bit) - extends battery life in portable instrumentation |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
The MCP3428-E/ST is housed in a 14-pin TSSOP package (body width 4.4 mm, lead pitch 0.65 mm) with exposed thermal pad (EP) internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 11–14 | CH1+ / CH1− / CH3+ / CH3− / CH4+ / CH4− | Differential analog inputs for four independent channels - support both differential and single-ended configurations |
| 3, 4, 12, 13 | CH2+ / CH2− / CH3− / CH4− | Paired with corresponding CHn+ pins to form complete differential pairs - require matched PCB routing for optimal CMRR |
| 5, 6 | VSS / VDD | Ground return path and 2.7–5.5V supply - VSS must connect to EP for thermal and electrical integrity |
| 7, 8 | SDA / SCL | Open-drain I²C bidirectional data/clock - require external pull-ups (5–10 kΩ) for standard/fast mode operation |
| 9, 10 | Adr0 / Adr1 | User-configurable I²C address pins - set to VSS/VDD/floating to select one of eight device addresses on shared bus |
Key Features
| Feature | Design Value |
|---|---|
| Per-conversion self-calibration | Automatically corrects offset and gain errors before each result - removes need for system-level recalibration over temperature or supply drift |
| Differential input impedance | 2.25 MΩ / PGA setting - high input impedance minimizes loading on high-Z sensor sources like RTDs and thermistors |
| One-shot conversion mode | 0.56 µA standby current at 12-bit - ideal for wake-on-event architectures in wireless sensor nodes |
| Integrated anti-aliasing filter | On-chip sinc filter with -3dB point at ~0.2× data rate - reduces external component count vs. discrete RC filters |
| ESD protection | ≥6 kV HBM, ≥400V MM - withstands handling and board-level transients without external protection diodes |
Applications
| Temperature Sensing with RTD | Bridge Sensing for Pressure |
|---|---|
Use Scenario: High-accuracy industrial temperature monitoring using Pt100/1000 RTDs in HVAC or process control cabinets. IC Role / Device Role / Timing Role: MCP3428-E/ST digitizes ratiometric voltage from constant-current-excited RTD bridge, rejecting common-mode noise via differential inputs. Use Value: 16-bit resolution and 10 ppm INL enable ±0.05°C temperature accuracy over –40°C to +125°C without external calibration. | Use Scenario: Digital output pressure transducers in medical ventilators requiring stable zero-point and span over lifetime. IC Role / Device Role / Timing Role: MCP3428-E/ST interfaces with Wheatstone bridge strain gauges, applying PGA gain to amplify mV-level outputs while rejecting supply ripple. Use Value: On-board 2.048V reference and per-conversion calibration maintain bridge measurement stability despite 15 ppm/°C ambient shifts. |
| Weigh Scales | Battery Fuel Gauges |
Use Scenario: Platform scales for warehouse logistics where mechanical load cells feed low-level differential signals. IC Role / Device Role / Timing Role: MCP3428-E/ST acquires four-channel load cell outputs simultaneously, enabling corner compensation algorithms. Use Value: Four independent differential inputs eliminate external multiplexers, reducing BOM cost and PCB area in multi-cell weighing systems. | Use Scenario: State-of-charge estimation in lithium-ion battery packs for portable power tools. IC Role / Device Role / Timing Role: MCP3428-E/ST measures cell voltage and shunt-based current sense with high common-mode rejection. Use Value: 12-bit/240 SPS mode provides fast sampling for dynamic load changes while consuming only 135 µA continuous current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit multi-channel ΔΣ ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS114S08IPWR | 8-channel, SPI interface, integrated excitation current sources, no on-board reference | Requires external 2.048V reference; better suited for RTD arrays with built-in biasing | Select when scaling beyond 4 channels or needing programmable current sources for 3-/4-wire RTDs |
| MCP3424-E/SL | Same family, SOIC-14 package, identical specs except Adr0/Adr1 pins tied internally - fixed I²C address | Limited to single-device I²C bus; no address configuration flexibility | Select when board space permits SOIC and only one ADC is needed per bus segment |
Compared with ADS114S08IPWR and MCP3424-E/SL, the MCP3428-E/ST uniquely balances I²C address configurability, integrated reference, and 4-channel differential input count in a compact TSSOP-14 - making it optimal for space-constrained, multi-sensor industrial nodes requiring bus scalability.
Availability
MCP3428-E/ST is available at Aetrix Electronics and suitable for precision sensor signal conditioning, industrial temperature monitoring, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MCP3428-E/ST 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 components, and Flash-IP solutions, headquartered in Chandler, Arizona.
The MCP342X series was designed specifically for high-accuracy, low-power sensor interfacing in industrial, automotive, and portable applications - emphasizing integrated calibration, robust noise immunity, and simplified system-level design.
FAQ
What is the maximum differential input voltage range for MCP3428-E/ST at PGA = 1?
The MCP3428-E/ST supports a differential input full-scale range of ±2.048V when the programmable gain amplifier is set to ×1. This is derived from its on-board 2.048V reference voltage and applies to all four differential channels. Exceeding this range causes saturation (all 0s or all 1s output codes), and users must scale inputs externally-e.g., via resistor dividers-to stay within limits while respecting absolute pin voltage constraints (VSS −0.3V to VDD +0.3V).
Does MCP3428-E/ST require an external crystal or clock source?
No, the MCP3428-E/ST does not require an external crystal or clock source. It contains a fully integrated on-board oscillator that drives the delta-sigma modulator and digital logic. This eliminates external timing components, reduces BOM count, and improves reliability in space-constrained or cost-sensitive designs. The oscillator's drift is characterized at ±1% over temperature and supply, sufficient for the ADC's specified performance.
How many unique I²C addresses can be configured on MCP3428-E/ST?
The MCP3428-E/ST supports eight unique I²C addresses via two user-configurable address pins (Adr0 and Adr1). Each pin accepts three states: logic low (VSS), logic high (VDD), or floating - yielding 3² = 9 combinations. However, one combination (both pins floating) outputs VDD/2 and is not used for address selection, leaving eight valid addresses. This enables up to eight MCP3428-E/ST devices on a single I²C bus without address conflict.
Can MCP3428-E/ST operate in single-ended input mode?
Yes, the MCP3428-E/ST supports single-ended input mode. For any channel n, the CHn− pin may be connected to VSS (ground) while CHn+ carries the signal - effectively converting the differential input stage into a pseudo-single-ended configuration. This is explicitly documented in Section 3.1 of the datasheet and validated in application examples. However, common-mode rejection and noise immunity are reduced compared to true differential operation.
What is the thermal resistance (θJA) of the MCP3428-E/ST in its TSSOP-14 package?
The MCP3428-E/ST in the TSSOP-14 package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as specified in the "Thermal Package Resistances" table (DS22226A-page 7). This value assumes standard JEDEC 2-layer board conditions. Proper PCB layout - including connection of the exposed thermal pad (EP) to a large copper pour tied to VSS - is essential to achieve this rating and maintain safe junction temperatures under continuous 135 µA operation at +125°C ambient.
MCP3428-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 4
- 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, Selectable Address
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 14-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3428-E/ST FAQ
1.How can I place an order for MCP3428-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3428-E/ST 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 MCP3428-E/ST reliable?
The price and inventory of MCP3428-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3428-E/ST is usually 5 days.
3.What payment methods are accepted for MCP3428-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3428-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3428-E/ST?
MCP3428-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3428-E/ST 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 MCP3428-E/ST?
For technical support, including MCP3428-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3428-E/ST requirements.
6.How does Aetrix verify that MCP3428-E/ST is sourced from the original manufacturer or authorized distributors?
All MCP3428-E/ST 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 MCP3428-E/ST meets industry standards.
7.What is the process for return or replacement of MCP3428-E/ST?
All MCP3428-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP3428-E/ST, 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 MCP3428-E/ST part is unused and in its original packaging.
Return procedure for MCP3428-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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