MCP3911A0T-E/ML

Analog Front End (AFE) Overview

The MCP3911A0T-E/ML is a dual-channel Analog Front End (AFE) from Microchip Technology, designed for high-precision energy metering and power measurement. It integrates two synchronous sampling 24-bit Delta-Sigma ADCs with programmable gain amplifiers (PGA) offering up to 32 V/V gain. The device operates on a single 2.7V to 3.6V supply and features a low-drift internal 1.2V voltage reference. Key performance metrics include a typical SINAD of 94.5 dB, THD of -106.5 dBc, and SFDR of 111 dB. It supports data rates up to 125 ksps via a high-speed 20 MHz SPI interface and includes digital offset and gain error correction registers.

Analog Front End (AFE) Feature Summary

• Dual-channel architecture with independent 24-bit Sigma-Delta ADCs and PGA (up to 32x gain).
• High dynamic performance: 94.5 dB SINAD, -106.5 dBc THD, and 111 dB SFDR.
• Integrated low-drift 1.2V internal voltage reference (7 ppm/°C) or differential external reference input.
• Programmable oversampling ratio (OSR) from 32 to 4096 and output data rates up to 125 ksps.

Analog Front End (AFE) Applications

• Energy Metering and Power Measurement
• Automotive Systems
• Portable Instrumentation
• Medical and Power Monitoring

Analog Front End (AFE) Procurement Notes

Verify the specific suffix 'E/ML' confirms the QFN-20 package and automotive-grade temperature range (-40°C to +125°C). Confirm RoHS compliance and AEC-Q100 qualification status through official Microchip documentation before procurement.

Analog Front End (AFE) Selection Notes

Select this component when precise simultaneous sampling of two channels is required for polyphase metering. Ensure the system clock (MCLK) can support the desired AMCLK frequency for the chosen boost and gain settings. Verify that the 20-lead QFN package fits the PCB thermal and spatial constraints.

Analog Front End (AFE) Part Context

This part belongs to the MCP3911 family of analog front ends. It is pin-to-pin compatible with the MCP3901 but offers enhanced dual-channel capabilities. The 'ML' suffix specifically denotes the 4x4 mm QFN package variant.

Analog Front End (AFE) Replacement Considerations

The MCP3901 is a pin-compatible alternative within the same family. Verify if single-channel operation suffices for the application to potentially reduce cost or complexity.

Analog Front End (AFE) FAQ

What is the maximum output data rate supported by the MCP3911?

The MCP3911 supports an output data rate of up to 125 ksps when configured with an OSR of 32 and BOOST setting enabled.

How does the MCP3911 handle channel synchronization?

The device features two synchronous sampling ADCs with separate Data Ready (DR) pins, allowing for easy synchronization with an MCU interrupt request.

Can the MCP3911 operate with an external voltage reference?

Yes, it provides differential Voltage Reference Input Pins (REFIN+/OUT and REFIN-) for external reference applications, in addition to the internal 1.2V reference.