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AD8364 and AD8362 TruPwr Detectors

Question asked by ellis005@umn.edu on Dec 2, 2014
Latest reply on Dec 3, 2014 by enash

I am looking for a device that outputs the instantaneous power of a 1MHz ultrasonic sonar echo as a means of estimating range from the change in the sonar transducer output power.  The input signal will be a modulated 1MHz sinusoid having a maximum peak-to-peak amplitude of between0.02 volts and 2.0 volts.  I am planning to feed this power estimate into an A/D DAQ board sampling at 1MHz and analyze the digitized trace of signal power to determine range.  Tech support from the manufacturer of the sonar hardware suggested that the AD8364 or AD8362 should work to do this.  1)  Is this correct and/or is there a better AD chip for my purposes?   2)  Can I use the associated Evaluation Board (e.g. AD8364-EVALZ) directly for my application?  The AD8464 data sheet states "The two RF input signals are applied to two broadband baluns (Anaren BD0826J50200A00), which, in turn, drive the AD8364 RF inputs. This device is specified to operate from 800 MHz to 2.6 GHz but is operational from 500 MHz to 2.7 GHz. To oper-ate below 500 MHz, these baluns can be removed so that the AD8364 is driven single-ended."  Can someone elaborate on exactly what modifications are required for use at 1MHz?  3)  Will this arrangement provide the power of my 1MHz signal that itself has a frequency response of 1MHz?  Does the frequency response of the power estimate (chip output) require tuning and if so, can this be done using the Evaluation Board?  How?  Thanks in advance.

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