Analog Comparator - Freescale
Analog Comparator - Freescale
Analog Comparator - Freescale
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Hysteresis<br />
►<strong>Comparator</strong> has small amount<br />
of hysteresis<br />
►Noisy inputs can cause multiple<br />
output transitions when input<br />
level is close to input threshold<br />
►Use output to bias input<br />
threshold<br />
►Given VCC=VOhigh=3.3V<br />
►Set Vth=1.9V; Vtl=1.4V<br />
►Pick R1=6.8k<br />
►Solve for R2=6.8k; R3=19k<br />
(use 18k)<br />
<strong>Freescale</strong> and the <strong>Freescale</strong> logo are trademarks of <strong>Freescale</strong> Semiconductor, Inc. All other product or service names are<br />
the property of their respective owners. © <strong>Freescale</strong> Semiconductor, Inc. 2007-2008. 21<br />
<strong>Comparator</strong> Example<br />
1 1 1 VCC<br />
Vth + + = +<br />
R1 R2 R3 R1<br />
1 1 1<br />
Vtl + + =<br />
R1 R2 R3<br />
VCC<br />
R1<br />
VOhigh<br />
R3<br />
TM
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