ACPL-C797T-500E [Broadcom]

The ACPL-C797T is a 1-bit, second-order sigma-delta modulator that converts an analog input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. It operates from a 5 V power supply with dynamic range of 79 dB with an appropriate digital filter. The differential inputs of ±200 mV (full scale ±320 mV) are ideal for direct connection to shunt resistors or other low-level signal sources in applications such as motor phase current measurement. The modulator data and on-chip sampling clock are encoded and transmitted across the isolation boundary where they are recovered and decoded into separate high-speed clock and data channels. Combined with superior optical coupling technology, the modulator delivers high noise margins and excellent immunity against isolation-mode transients. Offered in a compact SSO-8 package, the isolated ADC delivers the reliability, small size, superior isolation and over-temperature performance that motor drive designers need to accurately measure current.