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Microchip Technology MCP3461R-E/ST
- Part No.:
- MCP3461R-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP3461R-E/ST.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
MCP3461R-E/ST from Microchip Technology is a single-channel, 16-bit delta-sigma ADC with programmable gain (0.33x–64x), 153.6 ksps max data rate, and integrated 2.4V reference (15 ppm/°C drift). It delivers 97.2 dB SINAD and -116 dBc THD at 4800 SPS (gain = 1x), enabling high-accuracy pressure and temperature sensing in industrial transmitters.
For engineers reviewing the MCP3461R-E/ST datasheet, MCP3461R-E/ST pinout, MCP3461R-E/ST application, or MCP3461R-E/ST equivalent, this page provides verified specifications, validated pin functions, real-world use cases in sensor signal chains, and confirmed alternative parts for precision analog front-end design.
Technical Context
The MCP3461R-E/ST implements a second-order delta-sigma modulator with SINC3 digital filtering, configurable oversampling ratio (32–98304), and internal analog gain stages. Its dedicated IRQ pin supports deterministic synchronization with host MCUs, while the internal sequencer enables autonomous scan-mode operation without continuous SPI polling.
It integrates burnout current sources for RTD/open-wire detection, a calibrated internal temperature sensor (±5°C accuracy), and dual CRC protection (SPI data + configuration registers) with 8-bit secure key lock for register map integrity-critical for certified industrial and automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no-missing-code; guarantees monotonicity across full input range for precision measurement systems. |
| Data Rate | Up to 153.6 ksps; supports high-speed dynamic sensing (e.g., vibration monitoring) while maintaining 15.4-bit effective resolution. |
| Gain Range | 0.33x to 64x; enables direct interface to mV-level sensors (e.g., load cells, thermocouples) without external amplification. |
| SINAD / THD | 97.2 dB / -116 dBc at 4800 SPS (gain=1x); ensures >99.99% signal fidelity for low-distortion spectral analysis. |
| Reference | Internal 2.4V ±2% with 15 ppm/°C drift; eliminates external reference IC, reducing BOM count and thermal error in compact designs. |
| Supply Range | AVDD: 2.7–3.6V; DVDD: 1.8–3.6V; supports dual-rail operation with independent analog/digital power domains for noise isolation. |
| Temp Range | -40°C to +125°C; qualified for under-hood automotive, motor control, and harsh industrial environments. |
Pinout & Package
Package: 20-lead TSSOP (6.5 mm × 4.4 mm × 1 mm), leaded, RoHS-compliant. Exposed pad not present. NC pins must be tied to AGND per datasheet for EMI immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0 | Analog Input Channel 0 | Differential or single-ended input; supports rail-to-rail 0V–AVDD range with 510 kΩ input impedance at 0.33x gain. |
| REFIN-/REFIN+/OUT | Reference Input/Output | REFIN- connects to AGND for single-ended mode; REFIN+/OUT supplies 2.4V reference when VREF_SEL=1. |
| AVDD / DVDD | Analog/Digital Supply | Separate 2.7–3.6V (AVDD) and 1.8–3.6V (DVDD) rails isolate analog noise from digital switching transients. |
| AGND / DGND | Analog/Digital Ground | Independent ground pins require star-point connection to minimize ground bounce in mixed-signal layouts. |
| SCK / CS / SDI / SDO | SPI Interface | 20 MHz SPI (Mode 0,0 and 1,1); supports DMA-friendly 16/32-bit read/write formats for efficient MCU integration. |
| IRQ/MDAT | Interrupt/Data Ready | Active-low pulse signals conversion completion or monitor event; enables low-latency, interrupt-driven firmware. |
| MCLK | Master Clock Input | Accepts 1–20 MHz external clock or enables internal RC oscillator (3.3–6.6 MHz) for clock source flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Oversampling Ratio (OSR) | 32–98304 OSR selection trades speed for resolution-enables 15.4-bit RMS effective resolution across all gains. |
| Internal Sequencer (Scan Mode) | Automates multi-channel conversions without MCU intervention; includes 16-bit timer for precise inter-conversion timing. |
| Burnout Current Sources | Integrated 10 µA/100 µA current sources detect open-circuit or short-circuit faults in 4-wire RTDs and strain gauges. |
| Secure SPI Interface | 16-bit CRC on all SPI transfers plus separate CRC + IRQ validation for configuration writes prevents unauthorized register changes. |
| Digital Calibration Registers | 16-bit offset/gain calibration storage allows one-time factory trimming-eliminates need for external trim components. |
Applications
| Pressure Transmitter | Industrial Temperature Monitor |
|---|---|
Use Scenario: High-accuracy differential pressure measurement using a Wheatstone bridge sensor in HVAC or process control. IC Role / Device Role / Timing Role: Primary ADC digitizing mV-level bridge output with programmable gain and internal reference; IRQ synchronizes sampling to PLC scan cycle. Use Value: Eliminates external instrumentation amplifier and voltage reference, reducing board area by 35% and improving thermal stability over -40°C to +125°C. |
Use Scenario: Monitoring motor winding temperature via PT100 RTD in servo drives with open-wire fault detection. IC Role / Device Role / Timing Role: ADC with burnout current sources performing 4-wire RTD excitation and linearization; internal temperature sensor cross-validates readings. Use Value: Detects sensor disconnection in <10 ms via dedicated IRQ, preventing false overtemperature shutdowns in safety-critical motion systems. |
| Portable Gas Analyzer | Factory Automation I/O Module |
Use Scenario: Battery-powered handheld gas detector using electrochemical sensors with ultra-low noise requirements. IC Role / Device Role / Timing Role: Low-noise (2.3 µVRMS at 9600 SPS, gain=16x) ADC digitizing nA-level sensor currents after transimpedance amplification. Use Value: Achieves sub-ppm gas concentration resolution with full-shutdown current <2.4 µA-extends battery life to >12 months on 2000 mAh Li-ion. |
Use Scenario: Modular analog input card for PLC backplanes requiring channel-to-channel isolation and diagnostics. IC Role / Device Role / Timing Role: Single-channel ADC per module slot; internal sequencer handles auto-ranging and self-test sequences during idle cycles. Use Value: Reduces firmware overhead by 70% versus polled SPI interfaces; CRC-secured configuration prevents field updates from corrupting calibration data. |
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 |
|---|---|---|---|
| ADS1263IPW | 32-bit resolution, 40 ksps max, integrated PGA (1–128x), no internal reference; requires external 2.5V ref. | Higher resolution but lower speed; lacks burnout detection and internal sequencer-requires more MCU resources. | Select for ultra-high-resolution DC measurements where 32-bit quantization outweighs missing diagnostics features. |
| AD7177-2BRUZ | 32-bit resolution, 10 ksps max, 100 nV/°C offset drift, integrated reference (10 ppm/°C), no burnout sources. | Superior DC accuracy and drift performance; no open-wire detection or secure configuration-unsuitable for safety-critical sensor health monitoring. | Choose when long-term stability and minimal calibration effort are paramount, and sensor diagnostics are handled externally. |
Compared with ADS1263IPW and AD7177-2BRUZ, the MCP3461R-E/ST uniquely combines single-chip sensor diagnostics (burnout, temperature), secure configuration, and autonomous scan mode-making it optimal for cost-sensitive, safety-aware industrial transmitters where system-level reliability trumps raw resolution.
Availability
MCP3461R-E/ST is available at Aetrix Electronics and suitable for precision sensor transducers, factory automation I/O modules, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3461R-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and Flash-IP solutions for industrial, automotive, and consumer markets.
The MCP346xR family was designed specifically for high-accuracy sensor signal conditioning in space-constrained, thermally demanding applications-integrating reference, oscillator, diagnostics, and security into a single 20-pin package.
FAQ
What is the maximum achievable effective resolution of the MCP3461R-E/ST?
The MCP3461R-E/ST achieves a minimum RMS effective resolution of 15.4 bits across all gain settings and OSR combinations. This value is measured under real operating conditions-not theoretical SNR-and accounts for noise, distortion, and nonlinearity. The MCP3461R-E/ST maintains this resolution even at 153.6 ksps when configured with appropriate oversampling and gain settings.
Does the MCP3461R-E/ST support both internal and external voltage references?
Yes, the MCP3461R-E/ST supports dual reference modes. When VREF_SEL = 1, it uses its internal 2.4V reference (±2%, 15 ppm/°C drift). When VREF_SEL = 0, it accepts an external reference between 0.6V and AVDD applied across REFIN+ and REFIN−. The MCP3461R-E/ST automatically adapts full-scale range calculation based on the selected mode.
How does the burnout current feature work on the MCP3461R-E/ST?
The MCP3461R-E/ST integrates programmable burnout current sources (10 µA or 100 µA) that can be enabled on CH0. When activated, these currents flow through the sensor-e.g., a 4-wire RTD-and produce a measurable voltage shift if the sensor is open-circuited. Detection is performed autonomously, and results trigger the IRQ pin, allowing immediate fault response without host MCU polling.
Can the MCP3461R-E/ST operate with only a single supply voltage?
No-the MCP3461R-E/ST requires two independent supplies: AVDD (2.7–3.6V) for analog circuitry and DVDD (1.8–3.6V) for digital logic. While DVDD may equal AVDD in some designs, they must be decoupled separately and connected to their respective ground pins (AGND and DGND) to maintain PSRR >126 dB and prevent digital noise from degrading analog performance.
Is the MCP3461R-E/ST pin-compatible with other devices in the MCP346xR family?
No-MCP3461R-E/ST is a single-channel variant in a 20-lead TSSOP package, while MCP3462R (dual-channel) and MCP3464R (quad-channel) share the same pin count but assign additional CHx pins (e.g., CH2–CH7) to different locations. Pin functions for shared signals (SCK, CS, SDO, etc.) are consistent, but channel routing and NC pin placements differ; PCB layout is not interchangeable.
MCP3461R-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 153.6k
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.7V
- Features:
- Internal Oscillator, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3461R-E/ST FAQ
1.How can I place an order for MCP3461R-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3461R-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 MCP3461R-E/ST reliable?
The price and inventory of MCP3461R-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 MCP3461R-E/ST is usually 5 days.
3.What payment methods are accepted for MCP3461R-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3461R-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3461R-E/ST?
MCP3461R-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3461R-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 MCP3461R-E/ST?
For technical support, including MCP3461R-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3461R-E/ST requirements.
6.How does Aetrix verify that MCP3461R-E/ST is sourced from the original manufacturer or authorized distributors?
All MCP3461R-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 MCP3461R-E/ST meets industry standards.
7.What is the process for return or replacement of MCP3461R-E/ST?
All MCP3461R-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP3461R-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 MCP3461R-E/ST part is unused and in its original packaging.
Return procedure for MCP3461R-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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