Microchip Technology MCP3461T-E/NC

Overview

MCP3461T-E/NC 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 supports differential or single-ended inputs, features ultra-low full shutdown current (<5 µA), and operates across –40°C to +125°C for industrial sensor transmitters and precision measurement systems.

For engineers reviewing the MCP3461T-E/NC datasheet, MCP3461T-E/NC pinout, MCP3461T-E/NC application, or MCP3461T-E/NC equivalent, key selection criteria include its 97.2 dB SINAD at 4800 SPS, 15.5-bit RMS effective resolution across all gains, internal SCAN-mode sequencer, 20 MHz SPI interface (Mode 0,0 and 1,1), and advanced security features including 16-bit CRC and register map lock.

Technical Context

The MCP3461T-E/NC implements a second-order delta-sigma modulator with analog gain, followed by a SINC3 digital filter and configurable oversampling ratio (OSR: 32–98304). Its internal oscillator (3.3–6.6 MHz) or external clock (1–20 MHz) drives precise timing, while the dedicated IRQ pin enables synchronization with host controllers without polling.

It integrates burnout current sources for RTD/open-wire detection, 16-bit digital offset/gain calibration registers, and a 24-bit timer for autonomous scan sequencing - reducing MCU intervention in multiplexed sensor acquisition. The device uses separate AVDD (2.7–3.6 V) and DVDD (1.8–3.6 V) supplies to isolate analog and digital domains.

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). The MCP3461T-E/NC variant uses the UQFN package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1263IPBSR and MAX11270ETJ+, the MCP3461T-E/NC delivers unique integration of burnout detection, internal temperature sensing, SCAN-mode autonomy, and cryptographic register protection - making it optimal for industrial sensor transmitters requiring self-diagnostic capability and long-term reliability.

Availability

MCP3461T-E/NC is available at Aetrix Electronics and suitable for precision sensor transmitters, factory automation I/O modules, and portable instrumentation requiring stable component supply, extended temperature support, and long-lifecycle availability.

Supply support for MCP3461T-E/NC 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 leading provider of microcontrollers, analog devices, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The MCP346x family is designed for high-accuracy, low-power sensor signal conditioning in harsh environments - emphasizing integrated diagnostics, security, and autonomous operation to reduce system-level complexity.

FAQ

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

The MCP3461T-E/NC achieves a maximum data rate of 153.6 ksps when configured with OSR = 32 and Gain = 1x. This requires MCLK = 4.9152 MHz and BOOST[1:0] = 11 (2x analog boost). At higher gains or OSRs, the rate decreases - e.g., 4800 SPS at OSR = 1024 and Gain = 1x. The device's timing is fully determined by the selected OSR and modulator clock.

Does the MCP3461T-E/NC support both internal and external clock sources, and how is the selection made?

Yes, the MCP3461T-E/NC supports both internal and external clock sources. Selection is controlled by the CLK_SEL[1] bit in CONFIG1: setting CLK_SEL[1] = 0 selects external MCLK (1–20 MHz), while CLK_SEL[1] = 1 enables the internal RC oscillator (3.3–6.6 MHz). The internal oscillator starts within 10 µs and consumes only 30 µA, making it ideal for low-power portable designs where crystal BOM reduction is critical.

How does the MCP3461T-E/NC handle sensor open-circuit detection, and what circuitry is involved?

The MCP3461T-E/NC integrates dedicated burnout current sources that can be enabled per channel via the BURN[1:0] bits. When activated, these sources inject a small, known current (typically ~200 nA) into the sensor element. An open circuit causes the input to rail, triggering a detectable saturation condition in the ADC output - enabling automatic fault reporting without external components. This is confirmed in the device's electrical characteristics table and block diagram.

What are the key differences between the MCP3461T-E/NC and the MCP3462/MCP3464 variants in the same family?

The MCP3461T-E/NC is the single-channel variant, whereas MCP3462 offers two channels and MCP3464 provides four channels. All share identical core architecture, resolution (16-bit), data rate (up to 153.6 ksps), and feature set (SCAN mode, CRC, burnout, temperature sensor). Pinout differs: MCP3461T-E/NC uses only CH0/CH1 for its single channel, while MCP3462 adds CH2/CH3 and MCP3464 adds CH2–CH7. Package and register map are otherwise compatible.

Can the MCP3461T-E/NC operate with separate analog and digital supplies, and what are the allowable voltage ranges?

Yes, the MCP3461T-E/NC uses independent analog (AVDD) and digital (DVDD) supplies. AVDD must be 2.7–3.6 V and powers the modulator, reference, and analog front-end. DVDD ranges from 1.8 V to AVDD + 0.1 V (but ≤3.6 V), powering the SPI interface and digital filter. This separation minimizes digital noise coupling into analog measurements and enables mixed-voltage system designs - confirmed in Section 1.1 Electrical Specifications.