Description
The CS5451A is a highly integrated delta-sigma (∆Σ) analog-to-digital converter (ADC) developed for the power measurement industry. The CS5451A combines six ∆Σ 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.

FEATUREs
• Synchronous Sampling
• On-chip 1.2 V Reference (25 ppm/°C typ.)
• Power Supply Configurations:
    - VA+ = +3 V; VA- = -2 V; VD+ = +3 V
    - Supply Tolerances: ±10%
• Power Consumption
    - 23 mW Typical at VD+ = +3 V
• Simple Four-wire Serial Interface
• Charge pump driver output generates negative power supply.
• Ground-referenced Bipolar Inputs