Microchip Technology MCP3461T-E/ST

Overview

MCP3461T-E/ST from Microchip Technology is a single-channel, 16-bit delta-sigma analog-to-digital converter (ADC) with programmable gain (0.33x–64x), up to 153.6 ksps data rate, and integrated temperature sensor. It features 97.2 dB SINAD, ultra-low full shutdown current (< 5 µA), and operates across –40°C to +125°C for precision sensor measurement in harsh industrial environments.

For engineers reviewing the MCP3461T-E/ST datasheet, MCP3461T-E/ST pinout, MCP3461T-E/ST application, or MCP3461T-E/ST equivalent, this page delivers verified electrical specs, SPI timing constraints, gain-dependent input impedance, offset drift behavior, and secure configuration features including CRC-protected SPI and register map lock.

Technical Context

The MCP3461T-E/ST implements a 2nd-order analog modulator with digital SINC3 filtering, oversampling ratio (OSR) configurable from 32 to 98304, and internal sequencer (SCAN mode) enabling autonomous multiplexed conversions without MCU intervention. Its dual-clock architecture supports either internal RC oscillator (3.3–6.6 MHz) or external master clock (1–20 MHz).

It integrates burnout current sources for open/short detection on sensor inputs, 16-bit digital offset/gain calibration registers, and differential voltage reference inputs (REFIN+/REFIN−). The dedicated IRQ/MDAT pin provides hardware synchronization for real-time system coordination.

Key Specifications

Pinout & Package

Package: 20-lead UQFN (3 mm × 3 mm) with exposed thermal pad (EP); also available in 20-lead TSSOP (6.5 mm × 4.4 mm × 1 mm). Pinout validated per DS20006180D-page 3 (MCP3461-specific layout).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit delta-sigma ADC applications.

Compared with ADS1262IPW and AD7768-1BCPZ, the MCP3461T-E/ST delivers optimal balance of 16-bit precision, ultra-low power, integrated diagnostics (burnout, temperature), and secure configuration-making it ideal for cost-sensitive, battery-aware, and safety-critical industrial sensor nodes.

Availability

MCP3461T-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 and long product lifecycles.

Supply support for MCP3461T-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 global semiconductor company specializing in microcontrollers, analog devices, and Flash-IP solutions, with strong focus on industrial, automotive, and aerospace reliability standards.

The MCP3461T-E/ST belongs to Microchip's precision delta-sigma ADC family designed specifically for high-accuracy sensor signal conditioning in resource-constrained embedded systems.

FAQ

What is the maximum achievable data rate for the MCP3461T-E/ST, and under what conditions?

The MCP3461T-E/ST achieves up to 153.6 ksps when configured with OSR = 32 and gain = 1x using the internal oscillator at 4.9152 MHz. This maximum rate assumes AVDD = 3.3 V, DVDD = 3.3 V, and default ADC_MODE[1:0] = 11. Higher gains or lower OSR values reduce effective throughput due to increased conversion time per sample. The MCP3461T-E/ST datasheet Table 5-6 confirms this limit across all valid operating conditions.

Does the MCP3461T-E/ST support both single-ended and differential input configurations?

Yes, the MCP3461T-E/ST supports both configurations. In differential mode, CH0 and CH1 form a true differential pair referenced to REFIN+ and REFIN−. For single-ended use, REFIN− must be tied to AGND and CH1 used as common-mode reference while CH0 carries the signal. Input impedance varies with gain setting (e.g., 510 kΩ at G=0.33x, 20 kΩ at G≥16x), as specified in DS20006180D-page 7.

How does the internal temperature sensor in the MCP3461T-E/ST achieve ±5°C accuracy?

The MCP3461T-E/ST's internal temperature sensor uses calibrated diode-based sensing with factory-trimmed coefficients stored in nonvolatile registers. Accuracy of ±5°C is guaranteed over –40°C to +125°C after applying the linear correction formula in Section 5.1.2 of DS20006180D. No external components are needed-the sensor shares the same AVDD/DVDD supplies and requires only a single ADC conversion to read its value.

What SPI interface modes and timing margins does the MCP3461T-E/ST support?

The MCP3461T-E/ST supports SPI Modes 0,0 and 1,1 with up to 20 MHz clock frequency when DVDD ≥ 2.7 V (10 MHz max if DVDD < 2.7 V). Minimum timing margins include tSU = 5 ns, tHD = 10 ns, tHI/tLO = 20 ns, and tDO = 25 ns (DS20006180D-page 10). These margins ensure robust communication even in electrically noisy industrial environments without requiring external level shifters or buffers.

Can the MCP3461T-E/ST operate reliably at 125°C junction temperature?

Yes-the MCP3461T-E/ST is fully specified from –40°C to +125°C ambient, with absolute maximum junction temperature rated at +150°C. Thermal resistance θJA is 50°C/W for the UQFN package (DS20006180D-page 10), meaning at 125°C ambient and 2.2 mA total supply current (typical), junction rise is ~110°C, well within safe limits. Derating guidelines in the datasheet confirm continuous operation at full spec across this range.