Unipolor to bipolar voltage converter for AD7621?

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asrock70

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I have unipolar AC voltage +-2V and need convert it to bipolar for 16bit ADC7621.
For +2V on unipolor is bipolar IN+ 2V and In-0.
and
for -2V on unipolor is bipolar IN+ 0 and In- +2V.

You advise?
 

Thsanks. This is my first idea too, but 1xAD8021 for level shifting from +-2V fo 0-4V and 2xAD8021 for converting single ended to differencial driver for AD762.

I think, maybe it can be realized with two amps
Mayby not and I use this way :lol:
 

Whatkind of signal is that -+2Vac , frequency?, signal type ?
if you need AD8021 amp ic
Can you add a simple block diagram of circuit you are planning

KAK

---------- Post added at 20:36 ---------- Previous post was at 20:28 ----------

Whatkind of signal is that -+2Vac , frequency?, signal type ?
if you need AD8021 amp ic
And what is your sampling time for A/D conversion
Can you add a simple block diagram of circuit you are planning

KAK
 

Frequency is 100Hz - 1MHz sin from DDS
For freq 100-750kHz is use 4x oversampling, for high freqency is use 3MSPS.
 
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You can use two opamps or better, a differential output opamp such as LTC1992 from memory.

Keith
 
Thanks
You're right, I use ad8139.
 

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