LMV7235M7X datasheet(10/22 Pages) TI1

Part #	LMV7235M7X

Description	LMV7235/LMV7239/LMV7239Q 75 nsec, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output

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Manufacturer	TI1 [Texas Instruments]

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LMV7235, LMV7239

SNOS532M – SEPTEMBER 2000 – REVISED FEBRUARY 2013

www.ti.com

When VIN is greater than VA (VIN > VA), the output voltage is low, very close to ground. In this case the three

network resistors can be presented as R2 || R3 in series with R1. The upper trip voltage VA2 is defined as:

VA2 = VCC (R2||R3) / [(R1)+ (R2||R3)]

(2)

The total hysteresis provided by the network is defined as:

Delta VA = VA1- VA2

(3)

To assure that the comparator will always switch fully to VCC and not be pulled down by the load the resistors,

values should be chosen as follows:

RPULL-UP << RLOAD

(4)

Figure 18. Inverting Comparator with Hysteresis

NON-INVERTING COMPARATOR WITH HYSTERESIS

A non inverting comparator with hysteresis requires a two resistor network, and a voltage reference (VREF) at the

inverting input. When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise up

to VIN1 where VIN1 is calculated by:

VIN1 = R1*(VREF / R2) + VREF

(5)

When VIN is high, the output is also high, to make the comparator switch back to it's low state, VIN must equal

VREF before VA will again equal VREF. VIN can be calculated by:

VIN2 = [VREF (R1+ R2) - VCC R1] / R2

(6)

The hysteresis of this circuit is the difference between VIN1 and VIN2.

Delta VIN = VCC R1 / R2

(7)

10

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