16-bit sigma-delta modulator is fully isolated

The AD7403 isolated 16-bit sigma-delta modulator is said to offer the highest accuracy available and targets precision current and voltage measurement in DC/AC power inverter and motor control applications. The device achieves an 81-dB signal-to-noise and distortion ratio (SINAD) (min) at 78 Ks/s over -40° to 125C°.

The chip integrates iCoupler digital isolation, creating a single-chip solution for measuring the voltage across a shunt resistor and converting it into a 1-bit data stream that can be clocked at up to 20 MHz. The UL recognized IC comes in a 16-lead, wide-body SOIC. It has a full-scale analog input range of ±320 mV and common-mode transient immunity of >25 kV/μs. $2.95 ea/10,000.