ZHCSH46A December 2017 – June 2018 AMC1311
The AMC1311 is a precision, isolated amplifier with a high input-impedance and wide input-voltage range. The input stage of the device drives a second-order, delta-sigma (ΔΣ) modulator. The modulator uses the internal voltage reference and clock generator to convert the analog input signal to a digital bitstream. The drivers (termed TX in the Functional Block Diagram section) transfer the output of the modulator across the isolation barrier that separates the high-side and low-side voltage domains. The received bitstream and clock are synchronized and processed by a fourth-order analog filter on the low-side and presented as a differential analog output.
The SiO2-based, double-capacitive isolation barrier supports a high level of magnetic field immunity, as described in ISO72x Digital Isolator Magnetic-Field Immunity. The digital modulation used in the AMC1311 and the isolation barrier characteristics result in high reliability and common-mode transient immunity.