I want to buy a digital anti-aliasing filter with following specifications:
1) Digitally controlled cutoff frequency from 10kHz to 100kHz.
2) Real-time response.
3) 100dB reduction in power in a span of 2 times cutoff frequency.
I want to use it for the following application:
I am using data acquisition board at 500K Samples per seconds and I want to analyze frequencies in between 100Hz to 50KHz. I want to remove all higher frequency very efficiently using anti-aliasing filter before data acquisition step. This is important because I want to profile underwater noise. Therefore, I want to remove signals above 100Khz completely.
I want to use this digital filter before using data acquisition board.
If you can suggest better external digital anti-aliasing filter specifications (and product name) than it would be of great help for me.
Thank you.