can a CPLD work like a DG413 analog switch?

[grips03]

I have a project that uses 2x DG413 analog switch and 3 74xx series logic gates. I know I can replace the 3 74xx with a CPLD and I've done that before and most likely will do it here again.

However can a CPLD also work like an analog switch? The each analog switch offers 3 paths between two wires. Each path has a different resistance, the analog switch allows the right path to be selected based on the input.

[mrflibble]

I seriously doubt it. Switches like the DG413 are reasonably low resistance bi-directional switches with low charge injection. I don't see how you're going to duplicate that using a CPLD. If the question is "can any random CPLD do everything I can do with an DG413?" then the answer is no. If you have very relaxed requirements, then maybe. But assuming the DG413 is there for a reason, that's not too likely...

[grips03]

good to know CPLD can't act like analog switch.

I wish Dave would do a show on what can and can not be built using CPLDs. For logic stuff they are awesome. Perhaps because that is what they are designed for

[Stonent]

I would assume anything analog is a no-go for a CPLD or FGPA, because you're building on logic devices, 1's and 0's, arrays of transistors etc.

[amyk]

Some digital ICs can be forced to work in linear mode (e.g. CD4000 series being used as audio amps) but they will draw more power, possibly to the point of failure.

[Laurynas]

PSoC could be an answer here. CPLD capabilities + configurable analog.
you can leave PSoC's MCU sleeping if you don't need it

[free_electron]

Cpld Complex Programmable LOGIC Device.
Clear now ?