Apr 28, 2011 #1 E EDA_hg81 Advanced Member level 2 Joined Nov 25, 2005 Messages 507 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 4,808 The ISL59441 has input buffer but why need those 10K resistors to reduce input impedance? Thank you for your answers. Attachments Untitled.png 28.9 KB · Views: 112
The ISL59441 has input buffer but why need those 10K resistors to reduce input impedance? Thank you for your answers.
Apr 29, 2011 #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 I assume they are to prevent the inputs floating, provide a DC reference point and supply the input bias current, not to reduce input impedance. Keith
I assume they are to prevent the inputs floating, provide a DC reference point and supply the input bias current, not to reduce input impedance. Keith
Apr 29, 2011 #3 B biff44 Advanced Member level 6 Joined Dec 24, 2004 Messages 5,048 Helped 1,376 Reputation 2,748 Reaction score 1,056 Trophy points 1,393 Location New England, USA Activity points 37,917 See those series caps? What do you think the gate's output would be without those pull down resistors?
See those series caps? What do you think the gate's output would be without those pull down resistors?
Apr 29, 2011 #4 E EDA_hg81 Advanced Member level 2 Joined Nov 25, 2005 Messages 507 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 4,808 You mean those 10K resistors are for making smooth edge? Thank you for your answers. ---------- Post added at 13:43 ---------- Previous post was at 13:42 ---------- Just like High pass filter?
You mean those 10K resistors are for making smooth edge? Thank you for your answers. ---------- Post added at 13:43 ---------- Previous post was at 13:42 ---------- Just like High pass filter?
Apr 29, 2011 #5 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 No. Because the inputs are capacitively coupled you need to fix the DC level of the chip to somewhere - you cannot just let it float around. Keith
No. Because the inputs are capacitively coupled you need to fix the DC level of the chip to somewhere - you cannot just let it float around. Keith