In AD8513 data sheet mentioned that it can be used as a instrumentation amplifier. can anyone please confirm it
an instrumentation amplifier is a special amplifier design, that usually incorporates several Operational Amplifiers and also very high precision resistors in order to a achieve a high common mode rejection ratio. Therefore, in Instrumentation amplifiers, these precision resistors are already integrated and trimmed to achieve the specified common mode rejection ratio. There are devices, which use an external resistor for programming the gain, others have several gain setting resistors already integrated and connected to pins that can then be connected externally to set the gain, and again others allow to modify the gain digitally or by strapping pins to a defined level. In the data sheet of the AD8513, Instrumentation is listed as field of application the device lends itself to be used in, due to its characteristics. So yes, you can build an instrumentation amplifier with the AD8513, but the AD8513 itself is just a quad Operational Amplifier. ADI's Instrumentation Amplifiers can be found on the following page: http://www.analog.com/en/specialty-amplifiers/instrumentation-amplifiers/products/index.html
If you look at one of these devices, you will clearly see the difference between both.
On the rev I. data sheet, it talks about using the AD8513 in Instrumentation, but it does not say it is an instrumentation amplifier, which is different from an operational amplifier. You can use op amps to build InAmps, but I would not use a quad in the classic three op amp instrumentation amplifier topology. The requirements of the second stage are quite different from the first stage and call for a different type of op amp.
i am looking for instrumentation amplifier. in AD8513 datasheet they mentioned that application as instrumentation and precision amplifier . i am still in confusion !!!
Unfortunately, the analog guys use a triangle for operational amplifiers, instrumentation amplifiers, and comparators. They are all different. Read our InAmp handbook, and you will be an expert. (almost!)
A Designer's Guide to Instrumentation Amplifiers (3rd Edition) | AD8557 | Power Monitors | Power Management | Analog Dev…
What makes you interested reading the AD8513 datasheets? Are you doing some application projects? Do you need an Instrumentation Amplfiier? Just let us know of what applications are you going into. From there, we can determine the most appropriate parts for you.
I searched through the AD8513 datasheet & it doesn't say it can be used as an instrumentation amplifier. What it does say is it is "suitable for instrumentation applications" , which is different.
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