Sigma-delta modulators convert analog input signals to high-speed single-bit data streams

Analog Devices ADuM7702 16-bit Sigma-Delta Modulators employ iCoupler technology to convert analog input signals to high-speed single-bit data streams with on-chip digital isolation. These modulators take a pseudo-differential input signal of ±50mV (±64mV full-scale) and work from a 4.5V to 5.5V power supply range (VDD1). This pseudo-differential input is ideal for shunting voltage monitoring in high-voltage applications where galvanic isolation is needed. The analog input of the modulators is constantly sampled by a high-performance analog modulator. The input signal is then converted into a digital density output stream with a data rate of up to 21MHz.

The modulators can reconstruct the original information with a suitable sinc3 digital filter to accomplish an 82dB SNR. These modulators are offered in both 16-lead SOIC_W and 8-lead SOIC_IC packages and operate within -40C to 125C temperature range.

Typical applications comprise shunt current monitoring, AC motor controls, power and solar inverters, and wind turbine inverters.