# Analog signal multiplexing with digital control

I need to route one of several analog signals to a single ADC input, using digital control signals. I have done this in the past using the 4051 multiplexer IC (or the more modern 74HC4051), but this time the signals are high frequency (about 100MHz) and should not be distorted or attenuated by the multiplexer. However, I have no idea on the bandwidth of a regular 4051 or 74HC4051, the datasheets I have found don't have this information.

What kind of parameter should I look for on the datasheet to understand the analog bandwidth of such a multiplexer?

• The datasheet has a frequency response on page 23. – Eugene Sh. Aug 26 '16 at 16:50
• Oh my, thanks a lot, and sorry for overlooking that page... – Marcovecchio Aug 26 '16 at 16:51
• @EugeneSh., i am suspect of the labeling. is this part good to $10^5$ kHz or to $10^5$ Hz? if the former, i guess the part is good enough for the OP. – robert bristow-johnson Aug 27 '16 at 6:14
• @robertbristow-johnson, it's really khz, the TI datasheet shows a similar chart confirming the information. Indeed, this part is enough for my needs, thanks! – Marcovecchio Aug 29 '16 at 14:04