Input dynamic voltage range of ADC

[monoj]

I am using an ADC(AD9042, 40MSPS) to digitize the incoming analog signal. This ADC is having input dynamic range of -0.5volt to +0.5volt, i.e. 1 volt. Now I have analog unipolar pulse at the input, and because of the ADC input range limitation, I am able to use only 0 to +0.5volt input range of the ADC. So how to use or utilize the full input dynamic range of this ADC or how to convert the input unipolar pulse into a bipolar one ?
By the way, I have to stick to this particular ADC as it is the only space qualified ADC available and meeting our other requirements.

 

[karesz]

Hi,
you have to insert an Opamp with offseting voltage of 0.5V for your rabge of +/- 0.5V...
Small problem, that best offseting becoms you if its a inverting circuit.
K.

Added after 2 minutes:

Tell us pls, what for an driver amp your ADC has, trhan maybe its simplest to adapt for +/- Input...

 

[monoj]

but this DC offset will be blocked by the capacitor at ADC input. so effectively only that 0.5V will reach to ADC.

 

[karesz]

Hi,
I think not.
If your ADC has a C-coupling, that means its range is, self the IC/after C-Coupling, i.e. at + 2.5V(Uref)...
K.

 

[FvM]

AC coupling of the ADC input is an option but not the only way to operate the device. For pulse signals with asymmetrical duty cycle,
DC coupling is more suitable I think. All possible variants are discussed in the datasheet.