The CS5451A is a highly integrated delta-sigma () analog-to-digital converter (ADC) developed for the power measurement industry. The CS5451A combines six ADCs, decimation filters, and a serial interface on a single chip. The CS5451A interfaces directly to a current transformer or shunt to measure current, and to a resistive divider or transformer to measure voltage. The product features a serial interface for communication with a microcontroller or DSP. The product is initialized and fully functional upon reset, and includes a voltage reference.