C1

R4

VO

R2

R3

R1

VA

+

-

VC

V

+

0

V

+

Copyright © 2016, Texas Instruments Incorporated

20

LPV7215

SNOSAI6J – SEPTEMBER 2005 – REVISED AUGUST 2016

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Product Folder Links: LPV7215

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Copyright © 2005–2016, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LPV7215 is an ultra-low-power comparator with a typical power supply current of 580 nA. It has the best-in-

class power supply current versus propagation delay performance available among TI's low-power comparators.

The propagation delay is as low as 4.5 µs with 100-mV overdrive at 1.8-V supply.

8.2 Typical Applications

8.2.1 Square Wave Generator

Figure 37. Square Wave Generator Schematic

8.2.1.1 Design Requirements

A typical application for a comparator is as a square wave oscillator. The circuit in Figure 38 generates a square

wave whose period is set by the RC time constant of the capacitor C1 and resistor R4. The maximum frequency

is limited by the large signal propagation delay of the comparator and by the capacitive loading at the output,

which limits the output slew rate.

8.2.1.2 Detailed Design Procedure

Figure 38. Square Wave Oscillator