ADS1191: Comparator voltage threshold

dong chen

Hi Smith

I have another question,plz help

I want to know the COMP_TH 's exact voltage

In datasheet page 48，It has a block diagram.but I do not know the OP comparator how to work? how the DAC(4bit) voltage output value?

please help

thank you

over 6 years ago

0 Alexander Smith over 6 years ago

TI__Mastermind 48340 points

Hello,

The positive threshold voltage will be (AVDD-AVSS)*Comp_TH[2:0] + AVSS.

For example, if:
AVDD = +2.5V
AVSS = -2.5V
Comp_TH[2:0] = 000 = 95%

(2.5V - (-2.5V)) * 0.95 + (-2.5V) = 2.25V

The negative threshold will use the inverse value of Comp_TH. In this case, 5%.

(2.5V - (-2.5V)) * 0.05 + (-2.5V) = -2.25V

For additional information, please consult this E2E post:
e2e.ti.com/.../2487575

0 dong chen over 6 years ago in reply to Alexander Smith

Prodigy 190 points

thanks for your help

Best regards

Data converters

Data converters forum

ADS1191: Comparator voltage threshold