Why Use an instrumentation Amplifier? + _ + _ . Classic 3 Op-Amp architecture 2 Op-Amp Architecture To sense the difference between two signals, amplify it, and provide a single ended output. To keep errors low, it should: Þ Reject common mode signals on its inputs Þ Have low offset voltage Þ Have low offset voltage drift The in-amp should also be easy to use and easy to design into your system. a ALP

Why We Beat the Competition The AD623 uses the classic 3 op-amp architecture. The competition uses the two op-amp architecture. AD623 Architecture INA126 Architecture Why is this significant? The AD623 (3 Op-Amp Architecture) provides superior common mode rejection performance over the INA126 (2 Op-Amp Architecture). Look at the results of a simple side-by-side comparison. a ALP

The AD623 Keeps errors Constant AD623 Typical CMRR From this graph you can see that: The AD623 keeps CMV errors constant out to 200MHz. This architecture successfully rejects 60Hz line noise and its harmonics. The common mode rejection performance of the BB INA126 drops off dramatically from 96 dB (typ) at 10 Hz to 72 dB (typ) at 200 Hz! a ALP

Compare the CMRR Performance Side by Side Input Signal (2V Scale) Common Mode Error at the Output (1mV Scale) AD623 G=5 INA 126 G=5 AD623 common mode error = 500mV INA 126 common mode error = 2mV The INA 126 gives you 4 times the error at a higher cost! a ALP

The Competition Gets Worse at Higher Gains! Same Input Signal (2V Scale) Common Mode Error at the Output (10mV Scale) AD623 G=100 INA 126 G=100 AD623 common mode error < 1mV INA 126 common mode error > 20mV The INA 126 gives you over 20x the error at a higher cost! a ALP

More Reason Why AD623 is Better Than BB INA126 Comparison of the AD623 and the INA126 in a typical application* * - 5V common mode signal - G=100 configuration - 20mV full scale signal - .02% resistor matching The AD623 gives you lower cost and lower total error than you can get from Burr Brown! And it’s single supply with rail to rail output! * a ALP

So Why Use The AD623 In Your Application? ALP