Hi, I would lige to use the dual tracking (posative) referenc LT6658 as a negative reference by connecting its vins and gnd pins to 0v and a negative rail.
I assume this will work in principal but it's the effect on its noise and stabilty I would be interested in when compared to the normal posative configuration.
If anyone has any experience of using this part in this configuration I would be grateful to hear their observations and thoughts.
I am quite sure, that this can not work!The bandgap is referenced to GND-Pin => your negative rail.So your negative output voltage is Uin- + Uref.
But what you will need is Uout = Ugnd - Uref.
I don't know if there is a special hack, to make it work with THIS reference.Try to simulate with LTspice and see what you get...
thanks for the reply Alexxx ... I think you might be right ...i'll take a closer look at this.
Could you share a drawing or schematic of what you are proposing to make sure we are on the same page ? Thanks.