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SK   - Zero-Drift Instrumentation Amplifier 2009-04-11 1. Probably this concept of Instr.Amp. is better than the three amps configuration. The CMRR is better through the higher frequency in theory but most of the time we need a good CMRR at 60 Hz. 2. The lack of literature on this Instr.Amp. create a handicap for the one who are trying to use it. In your literature we find the specs, a description of the Evaluation board and this article. 3. This new concept with the two references makes it non intuitive to use the instrumentation amp MAX4208/09. The noise is not the most important factor.
Prashanth   - Re: Zero-Drift Instrumentation Amplifier 2009-04-13 Dear SK: Thank you for taking the time to give some feedback. You make some very important points. (1) It is true CMRR at 60Hz is very important. The MAX4208/9 provides this as well - Please see TOC09 on bottom of Page 7. Performance at 60Hz is as good as at DC. (2) We will continue to develop helpful information to assist you in designing with this architecture of INAs. At present please find the following App notes that talk about application circuits using the Indirect Current-Feedback Architecture: (a) AN4034(Three is a Crowd for Instrumentation Amplifiers) (b) AN4050 (Current Sensing on a Negative Voltage Supply Rail, using a Precision Instrumentation Amplifier) (c) AN4321: Precision Instrumentation Amplifiers with Rejustors Solve High-Gain Applications) (d) Please also see Datasheets of MAX4460 and MAX9922 for additional information. In addition, our Customer Support channels will be able to help you with application specific topics. (3) Yes, Noise is only one of the many issues to grapple with in Precision Analog Designs. I will have the statement corrected. Thank you for pointing that out. Regards, Prashanth Maxim: Innovation Delivered
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