SBAS920 October 2018 AMC1302-Q1
The AMC1302-Q1 is a fully-differential, precision, isolated amplifier. The input stage of the device consists of a fully-differential amplifier that 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 (called TX in the Functional Block Diagram) 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 output of the device.
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 AMC1302-Q1 (see also the Isolation Channel Signal Transmission section for more details) and the isolation barrier characteristics result in high reliability and common-mode transient immunity.