Single to Differential Conversion

Hello Paul,

  I'm assuming when you say "converter" you are referring to a circuit that performs single-ended to differential signal conditioning, and not a differential ADC, correct?

  Without any specifics such as required BW, gain, power supplies, etc., in general the single-ended to differential signal output will consist of one signal that follows the input signal, and one that is an inverted-image of the input signal.  Let's say you are using a unity-gain design, so one output signal will be a buffered version of the input, at Vin = 0v the Vout is 0v, at Vin = 2v the Vout is 2v; the other buffer will invert the input signal, so at Vin = 0v the -Vout will be 2v, and at Vin = 2v, the -Vout will be 0v. 

  Here is a Ref Design that might be of help in understanding: www.ti.com/lit/ug/tidu038/tidu038.pdf ; and the supporting documentation here on this page: www.ti.com/tool/TIPD131 .

  And here is an audio differential driver, see the schematic and details on beginning on page 11: www.ti.com/lit/ds/symlink/drv134.pdf .

A similar device is the THS4521, and in the App Notes section of the Product page, there are several App Notes that go into detail, depending on what you are designing: www.ti.com/product/THS4521/technicaldocuments ;  for example:

Fully-Differential Amplifiers (Rev. E) ,

Converting single-ended video to differential video in single-supply systems , and

Using single-supply fully diff. amps with neg. input voltages to drive ADCs .

Let me know if you have any further questions.  A block diagram of what you are proposing to design, and the functional requirements would be very helpful to refine any further design questions. 

At your service,

~Leonard