Have anyone used MAXIM ADC MAX 110/111? I am using Maxim ADC's max110/max111 for converting analog signals. I have used the following control words for the first three steps of caliberation. offset correction8D0C gain caliberation8D08 offset null 8D04 I have used the following specifications channels IN1+ and IN1 VREF=+2.5V VREF= 2.5 V VSS/VDD=/+5V CLOCK cycles920 clock divider = 4:1 I have the following questions. 1.What will be the conversion resolutions in terms of bits. 2 will i get all the 14 data bits +plus sign bit + overflow bit(16 bits as my output. 3 when i give an input voltage say 0.345v at IN1+ and 0.12v at IN1 .I get the following output word 8D04.is it correct. 4.Should i take 2's complememt for the above word, since i use differential input mode. 5 what is the formula for calcualting the volatge in differential i/p mode whether it is total counts*vref/16384.What is the value of VREF here. 2.5v or 2.5/2 v. Thank you Praveen k 3. 

MAX 110/111ADC
Started by ●November 11, 2003
Posted by ●November 12, 2003
This is a rather complicated chip. I will try to learn the data sheet in the next day or so. What you say does not sound correct. It should ouput 14 bits with sign and overflow, in effect 15 bits, 14 positive and 14 negative. If the sign is negative, it is 2's complement output and indicates that v is less than v+. That is my thinking at this time, being ignorant. Looks like your output is your offset null input. Let me study. Chad  praveen <> wrote: > Have anyone used MAXIM ADC MAX 110/111? > > I am using Maxim ADC's max110/max111 for converting analog signals. > I have used the following control words for the first three steps of > caliberation. > > offset correction8D0C > gain caliberation8D08 > offset null 8D04 > > I have used the following specifications > channels IN1+ and IN1 > VREF=+2.5V > VREF= 2.5 V > VSS/VDD=/+5V > CLOCK cycles920 > clock divider = 4:1 > > I have the following questions. > > 1.What will be the conversion resolutions in terms of bits. > > 2 will i get all the 14 data bits +plus sign bit + overflow bit(16 > bits as my output. > > 3 when i give an input voltage say 0.345v at IN1+ and 0.12v at IN1 > .I get the following output word 8D04.is it correct. > > 4.Should i take 2's complememt for the above word, since i use > differential input mode. > > 5 what is the formula for calcualting the volatge in differential > i/p mode > > whether it is total counts*vref/16384.What is the value of VREF > here. 2.5v or 2.5/2 v. > > > Thank you > Praveen k > 3. > __________________________________ 