ADCMP370/ADCMP371

Data Sheet

The hysteresis is the difference between these voltage levels and

is given by

)

(

)

(

)

(

R3

R2

R1

R2

R3

R1

R2

R1

V

V

CC

IN

×

+

×

+

×

×

×

=

∆

OUT

ADCMP371

IN+

IN–

= 1.67V

= 3.33V

R3

R1

R2

R1

R3

R2

R2 = 1M

Ω

R3 = 1M

Ω

R1 = 1M

Ω

Figure 20. Inverting ADCMP371 Comparator Configuration with Hysteresis

For the ADCMP370 configuration, a pull-up resistor is required

for the open-drain output, which affects the hysteresis calcula-

tion. The noninverting ADCMP370 configuration is shown in

Figure 21. The upper switching threshold is

(

)

R2

R2

R1+

IN_HI

V

V

The lower input threshold level is given by

(

)

PULLUP

CC

PULLUP

R

R2

R1

V

R

R2

R1

+

−

+

+

IN_LO

V

V

The hysteresis is the difference between these voltage levels

PULLUP

R

R2

R1

+

=

∆

CC

IN

V

V

ADCMP370

IN+

IN–

OUT

R1

R2

Figure 21. Noninverting ADCMP370 Comparator Configuration with

Hysteresis

The inverting ADCMP370 configuration is shown in Figure 22.

The upper and lower switching thresholds are

(

R

R3

R1

R2

V

V

PULLUP

CC

IN_HI

+

+

=

)

(

||

(

)

))

(

(

)

(

))

(

(

)

(

PULLUP

PULLUP

PULLUP

CC

IN_HI

R

R3

R2

R1

R2

R

R3

R1

R

R3

R1

R2

V

V

+

×

+

×

+

+

×

+

+

×

=

(

)

(

(

||

)

(

||

PULLUP

PULLUP

CC

IN_LO

R

R3

R2

R1

R

R3

R2

V

V

+

+

+

=

))

(

(

)

(

))

(

(

)

(

PULLUP

PULLUP

PULLUP

CC

IN_LO

R

R3

R2

R1

R2

R

R3

R1

R

R3

R2

V

V

+

×

+

×

+

+

×

+

×

×

=

The hysteresis is the difference between these voltage levels and

is given by

))

(

(

)

(

))

(

(

PULLUP

PULLUP

CC

IN

R

R3

R2

R1

R2

R

R3

R1

R2

R1

V

V

+

×

+

×

+

+

×

×

×

=

∆

ADCMP370

IN+

IN–

OUT

R3

R1

R2

Figure 22. Inverting ADCMP370 Comparator Configuration with Hysteresis

Rev. D | Page 10 of 12