I want to use AD8334 but curve of gain and frequency response ( figure-2 ) starts at 100Khz in AD8331/AD8332/AD8334 datasheet.
Why starts at 100Khz? Can I use it under 100Khz?
My project center frequency is 75Khz (under 100Khz). My project includes 8 channel (each channel is exactly the same as the other)
So Does it make a difference between channels?
Since this device is designed to be powered from a unipolar source, the input stage has a bias system and the voltage at the bases should be within 0-5 volts. This uses capacitive coupling between the signal source and the input. The value of this capacitor determines the lower cutoff frequency.
You can easily use this device with AC input voltage only and, of course, at 75 kHz. It is possible that this will require a small increase in the capacity of the input capacitor.