MCP3903-I/SS

Analog Front End (AFE) Overview

The MCP3903-I/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 ultra-low-power shutdown modes consuming less than 2 μA.

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
• Independent analog (4.5-5.5V) and digital (2.7-3.6V) power supplies

Analog Front End (AFE) Applications

• Energy metering and power measurement systems
• Portable instrumentation requiring low power consumption
• Medical monitoring equipment
• Industrial power monitoring applications

Analog Front End (AFE) Procurement Notes

Verify the 'I' suffix indicates the extended temperature range (-40°C to +125°C) and 'SS' denotes the 28-lead SSOP package. Confirm that the component matches DS25048B documentation. Ensure supply voltages align with specified ranges: AVDD 4.5V–5.5V and DVDD 2.7V–3.6V. Check for physical integrity of the SSOP package pins before integration.

Analog Front End (AFE) Selection Notes

Select this AFE when simultaneous sampling of multiple phases or signals is required for accurate power calculations. The integrated phase compensation simplifies calibration in polyphase energy metering. Choose if system design demands independent analog and digital power domains to minimize noise coupling. Verify that the 10 MHz SPI speed and DMA capabilities meet the host MCU's processing requirements.

Analog Front End (AFE) Part Context

The MCP3903 belongs to Microchip's family of high-precision analog front ends designed for metrology. It consolidates multiple ADCs, PGAs, and references into a single package, reducing board space compared to discrete solutions. The I/SS variant specifically targets industrial environments requiring wide temperature operation and compact surface-mount packaging.

Analog Front End (AFE) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided datasheet. Consult Microchip Technology for current cross-reference information or newer generation replacements.