MCP3903-E/SS

Analog Front End (AFE) Overview

The MCP3903-E/SS is a six-channel Analog Front End (AFE) featuring three pairs of synchronous sampling 16/24-bit Delta-Sigma ADCs. It operates with AVDD at 4.5V–5.5V and DVDD at 2.7V–3.6V, supporting data rates up to 64 ksps. Key electrical specifications include 91 dB SINAD, -100 dBc THD, and 102 dB SFDR per channel. The device integrates high-gain PGAs (up to 32 V/V), phase delay compensation with 1 μs resolution, and an internal voltage reference with 5 ppm/°C drift. It utilizes a 10 MHz SPI interface and offers <2 μA shutdown current.

Analog Front End (AFE) Feature Summary

• Six synchronous sampling channels with proprietary multi-bit architecture for reduced idle tones
• High dynamic performance: 91 dB SINAD, -100 dBc THD, and 102 dB SFDR
• Integrated phase delay compensation between channel pairs with 1 μs time resolution
• Ultra-low power shutdown mode consuming less than 2 μA

Analog Front End (AFE) Applications

• Energy metering and power measurement systems
• Portable instrumentation devices
• Medical monitoring equipment
• General power monitoring applications

Analog Front End (AFE) Procurement Notes

Verify the 'E' suffix indicates the extended temperature range (-40°C to +125°C) as specified in the datasheet. Confirm the '/SS' package designation corresponds to the 28-lead SSOP form factor. Ensure supply voltages match the required AVDD (4.5V–5.5V) and DVDD (2.7V–3.6V) rails during integration testing.

Analog Front End (AFE) Selection Notes

Select this component when simultaneous sampling of multiple phases or signals is required for accurate power calculations. The integrated phase compensation simplifies calibration compared to discrete ADC solutions. Consider the 10 MHz SPI speed if high throughput is needed, and verify that the differential input range aligns with the sensor output after PGA amplification.

Analog Front End (AFE) Part Context

This part belongs to Microchip's MCP390x family of energy metering AFEs. The MCP3903 specifically provides six channels, whereas other variants may offer different channel counts. The '-E' denotes the industrial/extended temperature grade, and '/SS' specifies the small outline plastic package with leads.

Analog Front End (AFE) Replacement Considerations

Direct pin-compatible replacements within the same family should be checked against channel count requirements. Verify that any substitute maintains the 28-lead SSOP package and supports the required 4.5V–5.5V analog supply range. Cross-reference SPI register maps if migrating from older revisions.