Please help me find a fast, dual supply SPDT analog switch

Hi paulplusx,

Can you share your schematic so we can understand and recommend the best fit switch for your application.

Thanks,

May

What I am trying to is generate an arbitrary one-shot pulse (variable width and variable amplitude). The amplitude is set by the DAC output which is then fed into one input of switch (ADG619). The second input of the switch is ground. Then I use a pulse generator (LTC6993-1) to trigger the switch between ground, DAC output, and back to the ground, which creates a pulse of the width approximately the same as the pulse trigger. The problem with ADG619 is the t_on and t_off times are not good as mentioned in the post, which creates a large rise and fall times for the output pulse. So I need a faster switch for having a short rise and fall time. If you still need a schematic I can provide it to you.

Hi paulplusx,

Have you tried using the Parametric Search Engine? Go to analog.com -> Products -> Switches & Multiplexers.

You may use this online tool and filter the parameters required for your application. 

I used this tool and filtered device configuration (2:1), Vspan Dual (15max), and enabled timing parameters for your preferred ton and toff. It will generate the available switches:

• ADG6xx (25ns to 100ns timing)
• ADG78x (7ns to 19ns)
• ADG73x (7ns to 19ns)

From here you can choose which switch is best fit for your requirement.

Let me know if this helps.

Regards,

May