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Negative rail output buffer

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Posted by raquib akolawala

on Dec 21 2012 03:57 AM

Hi,

I am currently trying to design a circuit with TTL level input (controllable by micro controller) controlling a buffer which can allow negative rail output (up to N8V) and gnd. I tried simple buffer but instantly blew (as expected). Even tried opamp and a transistor switch type circuit even that blew. I even tried searching the product list with no luck for some IC which can directly pass negative rail by some controlling method.

I even tried using power on-off pin on negative voltage supply IC and even negative rail LDO, but i need this circuit to work at 10Mhz.

What I wanted to know is there any way I can pass negative rail through a buffer or any other circuit and make it work that fast.

Also is there any way other to get this done?

Thanks Regards

Raquib Akolawala

PS:: I don't know if i have put this in the correct forum. sorry in advance.

All Replies

Posted by Chris Cockrill

on Dec 21 2012 10:39 AM

Mastermind32850 points

Cd4016 is a switch that can work at +/- voltage. there are several others in the CD4XXX line of parts.

Posted by raquib akolawala

on Dec 23 2012 22:46 PM

Prodigy250 points

Hi Chris

I checked the datasheet it specifies voltage range on the input as 0V to Vcc.

I need to pass N8V on the buffer. nowhere does it specify that you can pass Negative voltage levels on the same.

Please can you clarify??

Thanks Regards

Raquib Akolawala

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