7.1 Overview

The AMC1204 and AMC1204B are single-channel, second-order, delta-sigma (ΔΣ) modulators designed for medium- to high-resolution analog-to-digital conversions. The isolated output of the converter (DATA) provides a stream of digital ones and zeros accurately representing the analog input voltage over time. The time average of this serial output is proportional to the analog input voltage.

The Functional Block Diagram shows a detailed block diagram of the AMC1204 and AMC1204B. The analog input range is tailored to directly accommodate the voltage drop across a shunt resistor used for current sensing. The SiO₂-based capacitive isolation barrier supports a high level of magnetic field immunity as described in the ISO72x Digital Isolator Magnetic-Field Immunity application report. The external clock input simplifies the synchronization of multiple current sense channels on system level. The extended frequency range of up to 20 MHz supports higher performance levels compared to the other solutions available on the market.