MCP3903T-E/SS

Analog Front End (AFE) Overview

The MCP3903T-E/SS is a six-channel Analog Front End (AFE) designed for energy metering applications. It integrates three pairs of synchronous sampling Delta-Sigma ADCs with programmable gain amplifiers (PGA), phase delay compensation, and an internal voltage reference. The device supports resolutions up to 24 bits with a maximum data rate of 64 ksps. Key electrical specifications include a typical SINAD of 91 dB, THD of -100 dBc, and SFDR of 102 dB per channel. It operates with independent analog (4.5V–5.5V) and digital (2.7V–3.6V) supplies and features a high-speed 10 MHz SPI interface.

Analog Front End (AFE) Feature Summary

• Six synchronous sampling 16/24-bit Delta-Sigma ADCs with proprietary multi-bit architecture
• High dynamic performance: 91 dB SINAD, -100 dBc THD, and 102 dB SFDR
• Integrated low-drift internal voltage reference with 5 ppm/°C temperature coefficient
• Phase delay compensation between channel pairs with 1 μs time resolution

Analog Front End (AFE) Applications

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

Analog Front End (AFE) Procurement Notes

Verify the 'E' suffix indicates extended temperature range operation (-40°C to +125°C). Confirm the '/SS' designation corresponds to the 28-lead SSOP package. Ensure compatibility with the required analog and digital supply voltages before procurement.

Analog Front End (AFE) Selection Notes

Select this component for applications requiring simultaneous sampling of multiple phases or channels. The integrated PGA allows direct interfacing with various sensors including shunts, current transformers, Rogowski coils, and Hall-effect sensors without external amplification.

Analog Front End (AFE) Part Context

The MCP3903T-E/SS belongs to the MCP3903 family of analog front ends. The 'T' suffix typically denotes tape and reel packaging, while 'E' specifies the extended industrial temperature range. This part is distinct from single-phase variants like the MCP3901 or other multi-channel models in the series.

Analog Front End (AFE) Replacement Considerations

Direct substitutes within the same family include the MCP3903-I/SS for commercial temperature range or MCP3903-E/PT for QFN packaging. Verify pinout and register compatibility when considering cross-package replacements.

Analog Front End (AFE) FAQ

What is the maximum differential input voltage range?

The specified linear differential input voltage range is ±500 mV/GAIN with VREF = 2.4V. The absolute maximum voltage with respect to AGND is ±1V without distortion.

How does the device handle clock inputs?

The MCP3903 supports a master clock frequency range of 1 MHz to 16.384 MHz via OSC1/OSC2 pins using a crystal or external clock source.

What is the crosstalk specification between channels?

The crosstalk between any two channels is specified as -115 dB at 50/60 Hz with OSR = 256 and dithering enabled.