MCP3919A1-E/SSVAO

Analog Front End (AFE) Overview

The MCP3919A1-E/SSVAO is a three-channel analog front end (AFE) featuring synchronous sampling 24-bit Delta-Sigma ADCs. It operates on a single 2.7V to 3.6V supply and includes high-gain programmable gain amplifiers (PGA) with gains up to 32 V/V. The device provides a typical SINAD of 93.5 dB, THD of -107 dBc, and SFDR of 112 dBFS. It incorporates a low-drift 1.2V internal voltage reference (9 ppm/°C), phase delay compensation, and digital offset/gain calibration registers. Communication is handled via a high-speed 20 MHz SPI interface with CRC-16 checksums for data integrity.

Analog Front End (AFE) Feature Summary

• Three synchronous sampling 24-bit Delta-Sigma ADCs with independent shutdown
• High dynamic performance: 93.5 dB SINAD, -107 dBc THD, 112 dBFS SFDR
• Advanced security features including 16-bit CRC checksums and register map lock
• Integrated 1.2V low-drift voltage reference (9 ppm/°C) and phase delay compensation

Analog Front End (AFE) Applications

• Polyphase energy meters
• Energy metering and power measurement systems
• Automotive applications
• Portable instrumentation
• Medical and power monitoring devices

Analog Front End (AFE) Procurement Notes

Verify the specific suffix 'VAO' against the manufacturer's current datasheet DS20005347C to confirm environmental compliance or package variations. Confirm availability through authorized Microchip Technology distributors as standard stock levels may vary. Ensure the SSOP-28 package matches the target PCB footprint requirements.

Analog Front End (AFE) Selection Notes

Select this component for applications requiring precise three-phase energy measurement with high dynamic range. The integrated PGA eliminates external amplifier requirements for small signal inputs. Verify that the MCU supports the required 20 MHz SPI interface and DMA capabilities for efficient continuous read/write operations. Ensure the system design accommodates the 2.7V to 3.6V supply voltage constraints.

Analog Front End (AFE) Part Context

This part belongs to the MCP3919 family of three-channel analog front ends designed for energy metering. It shares core architecture with variants like the MCP3919BA1-E/SS but may differ in ordering suffixes related to packaging or environmental specifications. The device integrates multiple functions typically found in discrete solutions, including ADCs, PGAs, and references, into a single 28-lead SSOP or QFN package.

Analog Front End (AFE) Replacement Considerations

Direct substitutes within the same family include the MCP3919BA1-E/SS. Verify pin compatibility and electrical specifications before substitution. Other Microchip AFEs like the MCP3903 offer different channel counts or resolutions and are not direct replacements.