What is the maximum signal level that can be applied to the AD8324 with a single ended input configuration as shown in figure 26 of the datasheet?
I'd like to apply a 455 KHz sine wave with an amplitude of 1.5V pk-pk if possible.
Sorry, I had a typo on the part number. It should be AD8324
AD8324 can receive a typical input AC voltage of 27.5 dBmV which is equivalent to 0.067Vp-p. Your input of 1.5Vp-p exceeds the operating range but is specified as the absolute maximum input voltage range. Therefore you can use the 1.5Vp-p however, we cannot guarantee that the part will work the same as the expected performance and as specified on the spec table. The 455 kHz frequency is also acceptable.
In addition, please use the recommended termination resistors to achieve the optimum performance of the part especially on single-ended configuration.
Thanks Anna. I guess this is something that will have to be tested.
I am also concerned about the output. The datasheet shows a balun on the output. Is there an alternate configuration that doesn't require a balun? Can I use some sort of resistor arrangement instead of a balun?
I would not want to apply a signal too close to the Absolute Maximum input rating of the device. This is because the Absolute Maximum Ratings are those beyond which you may damage or destroy the device. Upon power up OR upon power down the stimulus "might" spike above the Absolute Maximum and damage the device. I suggest using a voltage divider similar to the one shown on page 11 of the data sheet. Of course, you may add d.c. blocking capacitors, if needed
As for the balun, I see no need for one, but using a balun is the easiest way to achieve differential to single ended conversion. You may use an instrumentation amplifier (or op-amps configured as an instrumentation amplifier) instead of the balun for differential to single-ended conversion. Of course, if you need a differential signal, no conversion is needed. In any case, be sure to march the output impedance with the input impedance of whatever follows this device.
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