ADCMP361

Rev. 0 | Page 11 of 12

APPLICATION INFORMATION

The ADCMP361 is a low power comparator and reference

circuit featuring a 400 mV reference that operates from 1.7 V

to 5.5 V. The comparator is 0.275% accurate with a built-in

hysteresis of 9.3 mV. There are two outputs, one the inverse

of the other. This enables the ADCMP361 to be used as an

inverting or a noninverting comparator circuit. These open-

drain outputs are capable of sinking 40 mA.

COMPARATORS AND INTERNAL REFERENCE

The comparator has one input available externally; the other

comparator input is connected internally to the 400 mV reference.

The rising input threshold voltage of the comparators is designed

to be equal to that of the reference.

POWER SUPPLY

The ADCMP361 is designed to operate from 1.7 V to 5.5 V.

and GND.

INPUTS

resistor string to the input, care must be taken when choosing

resistor values. This is due to the fact that the input bias current

will be in parallel with the bottom resistor, R2, of the input

resistor divider string. This bottom resistor must therefore be

chosen carefully in order to reduce the error introduced by this

bias current (see Figure 30).

OUTPUTS

The open-drain comparator outputs are limited to the

ADDING HYSTERESIS

To prevent oscillations at the output caused by noise or slowly

moving signals passing the switching threshold, each compara-

tor has built-in hysteresis of approximately 9.3 mV. Positive

feedback can be used to increase hysteresis.

OUT

IN

ADCMP361

400mV

GND

OUT

R1

R2

Figure 30. Input Bias Current Effect on Input Resistor String