Description

This reference design accurately measures 16-channel AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range. This range covers protection and measurement requirements (including sampling requirements as per IEC 61850-9-2): which simplifies system design and improves trip time repeatability: performance: and reliability. The AC analog input module (AIM) is isolated from the host processor using a digital isolator with an integrated power converter or using a six-channel digital isolator. In its simplest configuration: a complete AC AIM can be designed using only five TI products to optimize system cost and size. The alarm feature identifies the AC AIM faults on a sample basis for faster fault detection. The ADC has an additional auxiliary channel to diagnose the output of the digital isolator supply or to compensate the measured analog inputs for temperature drift.