lock-in amplifier using AD630 or ADA2200.

Question

Hello, 
 I want to built a lock-in amplifier with a LO frequency below 5kHz. I am little confused about the choice between AD630 and ADA2200. The performance is the main concern in my application (not the power consumption nor the price). How can I choose the best part: what are the main specifications to look at? And what would be better as a preamplifier: a low noise transimpedance amplifier (such as AD8067, ...) or an input amplifier (such as ADA8429, ...)? 
 Thank you very much for your answer. 
 Thomas

ADIApproved · Accepted Answer

Hello, 
 Thanks for the email. The AD630 performs as a synchronous detector and was designed as a LF averaging detector. When I see the term LO I associate it with a PLL. The AD630 isn't a PLL, if that is what you need. The original targeted application was to extract very-low amplitude directional information from LVDTs and performs very well at that. However there is no phase detector or I and Q detection and so does not emulate a true PLL. 
 I'm not an expert on the ADA2200, and I know of no comparison studies between the 2 parts. Contact Brian Harrington 
 for further info on ADA2200. 
 Brian.Harrington@analog.com 
 Best 
 js)

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lock-in amplifier using AD630 or ADA2200.