ACPL-C740

ACPL-C740 Optically Isolated Sigma-Delta Modulator Data Sheet Description The Broadcom® ACPL-C740 is a 1-bit, second-order sigmadelta (-) modulator that converts an analog input signal into a high-speed data stream with galvanic isolation based on optical coupling technology. The ACPL-C740 operates from a 5V power supply with dynamic range of 86 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 analog input is continuously sampled by a means of sigma-delta over-sampling using an onboard clock. The signal information is contained in the modulator data, as a density of ones with data rate of 20 MHz, and the data are encoded and transmitted across the isolation boundary where they are recovered and decoded into high-speed data stream of digital ones and zeros. The original signal informati...