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A Single-Supply, Low Power Programmable Window Detector (CN0182)

The circuit shown in Figure 1 is a single-supply, low power, window detector with programmable upper and lower limits. This type of circuit can be used to generate an alarm if a signal falls outside the preset limits and is popular in detection and monitoring applications. The AD5668-1 octal, low power, 16-bit, buffered voltage-output DAC is used to set the limits of the window. The AD5668-1 has an on-chip, 1.25 V, 5 ppm/°C reference, giving a full-scale output range of 0 V to 2.5 V. The internal reference is enabled using a software write. An SPI interface is used to communicate with the AD5668-1.

The comparator used is an ADCMP370, a general-purpose, low power comparator (20 μW typical at 5 V) with an input offset voltage of 9 mV maximum and an open-drain output.

Figure 1. Low Power, Single-Supply Window Detector (Simplified Schematic: All Connections and Decoupling Not Shown)


  • Programmable window detector
  • Single supply
  • 4 seperate channels possible


Схемы и диаграммы

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Используемые компоненты

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