IAC is what I call integrated analog circuits, some prefer AFE (analog front ends) while others would say IS (integrated solutions.) Whereas DIY has a universal meaning, “do it yourself!”
So the question now is, are you better off with an IAC over DIY, and why? It depends on the application, expertise, time to market, and total cost.
It’s almost like choosing a watch. Do you want it sporty or classy? Would you like a self winding automatic movement or quartz? How about crystal sapphire or hardened mineral glass? Or do you just want to know what time it is?
Consider an IAC in applications where several platforms could “reuse” the design with a quick spin. This is especially true for applications like temperature control and monitoring, weigh scales, and medical instrumentation, such as ECG/EEG and pulse oximetry. Most IACs are supported by easy-to-use software meant to help the system designer expedite a design and get a very good idea on the capabilities of these devices before deciding to prototype. Some popular devices include the ADS1298 and ADS1299 for ECG and EEG respectively, the LMP9100 front end for gas monitoring and the AFE4400 complete sub system sub system for pulse oximetry.
On the other hand, there is always the DIY approach because of the 20nV/°C of drift which can only be accomplished by a super high precision op amp, such as the LMP2021. There are those looking for that 1nV which can only be found in a high voltage bipolar amplifier like the OPA211, and those who prefer analog-or digital filtering because that’s their secret sauce.
The choice is yours and you know your needs better than anyone, but the bottom line is more isn’t necessarily always better, if you’re racing the clock trying to put out a new product, then IAC is your best bet. If you’ve got room to spare on your board and want the highest quality product then perhaps a DIY approach is for you.
Let me know if an IAC or a DIY worked better for you. Or, ask questions and share knowledge with fellow engineers on the Support Forums in the TI E2E Community.