Analog Devices ADuM7701 16-Bit, Isolated Sigma-Delta Modulators convert analog input signals into high speed, single-bit data streams, with on-chip digital isolation based on iCoupler technology. The modulators run from a 5V (VDD1) power supply and allow a pseudo-differential input signal of ±250mV (±320mV full scale). In high voltage utilisation where galvanic isolation is needed, the pseudo-differential input is perfectly suited to shunt voltage monitoring.
The device continuously samples the analog input, converting to a ones density digital output stream with a data rate of up to 21MHz. The serial input/output operates from a 5V or a 3.3V supply (VDD2). The device accepts the original information reconstructed with a suitable digital filter to deliver an 86dB SNR at 78.lkSPS with a 20MHz MCLK.
The device provides a serial interface that is digitally isolated. Combining CMOS and monolithic transformer technology provides outstanding performance characteristics, superior to alternatives using on-chip isolation. The device is offered in both 16-lead and eight-lead wide-body SOIC packages and has an operating temperature range of -40C to +125C.
Typical applications for the device includes shunt current monitoring, AC motor controls, power and solar inverters, wind turbine inverters, and analog-to-digital and optoisolator replacement.