Best way to get a stable negative power rail

[AMyatt]

I have a 5v supply and need a +-5v supply for a DAC. What is the best way to get a stable -5v supply from the 5v supply I have?

Thanks

[T3sl4co1l]

Current?  Ripple?  How stable is "stable"?

Weak piddly stuff, you'd usually go with a charge pump (ICL7660 or one of those SOT-23-5 devices) and eat the ~1V loss.

Tim

[Richard Crowley]

There are chips and circuits that convert +x voltage to -x voltage.
But there is no way of answering your question without knowing how much current you need.
These kinds of solutions are typically good for only low current.
If you need significant current, then you should probably be looking at an additional supply for the - rail.

[AMyatt]

Hi Tim,

Thanks for your reply.

I am looking at using one of these DACs (http://www.analog.com/en/audiovideo-products/audio-da-converters/ad1851/products/product.html).
The output will basically go to an ADC within another product.

[Richard Crowley]

I am looking at using one of these DACs (http://www.analog.com/en/audiovideo-products/audio-da-converters/ad1851/products/product.html).

The power requirements for that chip are pretty low, so a charge-pump converter would probably work fine.

The output will basically go to an ADC within another product.

So you are converting digital to analog so you can feed it into an analog to digital converter? 

[AMyatt]

Hi Richard,

Thank you for your reply.
Based on your reply and Tim's it would seem that a charge-pump converter is the way to go.

So you are converting digital to analog so you can feed it into an analog to digital converter? 

Yes, I know this sounds stupid and is going to loose some accuracy but unfortunately I don't have control over the input side.
The input of the existing product was designed to be connected to a sensor that outputs a varying voltage.
I am wanting to emulate this sensor.