Broadcom ACPL-C740 Sigma-Delta Modulators
Broadcom ACPL-C740 Sigma-Delta Modulators 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 a dynamic range of 83dB with a designated digital filter. The differential inputs of ±200mV (full-scale ±320mV) are ideal for direct connection to shunt resistors. The inputs are also utilized in other low-level signal sources in applications. The ACPL-C740 has an analog input that 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 a data rate of 20MHz. This data is then encoded and transmitted across the isolation boundary where they are recovered and decoded into a high-speed data stream of digital ones and zeros.
Features
Superior optical isolation and insulation20MHz internal clock1bit, second-order sigma-delta modulator16bits resolution no missing codes (12bits ENOB)83dB SNR2μV/°C maximum offset drift3V to 5.5V wide supply range for digital interface±1% gain errorInternal reference voltage
Applications
Servo Drives and MotorsMotor Phase and Rail Current SensingPower Inverter Current SensingIndustrial Process Control
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