High-speed functionally isolated window comparator with internal reference

The AMC21C12 is an isolated window comparator with a short response time. The

open-drain output is galvanically isolated from the input circuitry by an isolation

barrier that is highly resistant to magnetic interference. The isolation barrier

supports a working voltage up to 200 VRMS or 280 VDC and

transient over voltages of up to 570 VRMS or 800 VDC.

The comparison window is centered at 0

V, meaning that the comparator trips if the absolute value of the input voltage

exceeds the trip threshold value. The trip threshold is adjustable from 20 mV to 300

mV through a single external resistor and, therefore, the comparison window ranges

from ±20 mV to ±300 mV. When the voltage on the REF pin is greater than 550 mV, the

negative comparator is disabled and only the positive comparator is functional. The

reference voltage in this mode can be as high as 2.7 V. This mode is particularly

useful for monitoring voltage supplies.

The open-drain output on the device

supports transparent mode (LATCH input tied to GND2) where the output follows the

input state, or latch mode, where the output is cleared on the falling edge of the

latch input signal.

The AMC21C12 is available in an 8-pin, 0.65-mm pitch VSON package and is

specified over the extended industrial temperature range of –40°C to +125°C.