Dec 21, 2010 #1 D Dman12 Newbie level 4 Joined Dec 20, 2010 Messages 5 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,315 Hello, I have ADC0804, and I need +0.250v at the vref pin. I used 100k potentiometer, but the voltage is not stable, and goes around 0.230v-0.300v - and I need 0.250-0.260 what can I do to make it stable. Thank you, and sorry for the rookie question
Hello, I have ADC0804, and I need +0.250v at the vref pin. I used 100k potentiometer, but the voltage is not stable, and goes around 0.230v-0.300v - and I need 0.250-0.260 what can I do to make it stable. Thank you, and sorry for the rookie question
Dec 21, 2010 #2 keith1200rs Super Moderator Staff member Joined Oct 9, 2009 Messages 10,865 Helped 2,065 Reputation 4,130 Reaction score 1,596 Trophy points 1,403 Location Yorkshire, UK Activity points 57,270 It needs a 5V reference (Vcc) or 2.5V fed in to Vref/2. You cannot use 0.25V. Keith
Dec 22, 2010 #3 T themaccabee Full Member level 4 Joined Apr 1, 2007 Messages 201 Helped 6 Reputation 12 Reaction score 6 Trophy points 1,298 Activity points 3,003 may be using a voltage reference ic for 2.5 V ??like ADR391ART-REEL7CT-ND,, it has got ±0.24% tolerance ????
may be using a voltage reference ic for 2.5 V ??like ADR391ART-REEL7CT-ND,, it has got ±0.24% tolerance ????