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Interfacing Uni-polar ADC to Bi-polar Signal
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hynix



Joined: 17 Dec 2002
Posts: 92
Location: Inda
Post15 Dec 2003 5:12   

Interfacing Uni-polar ADC to Bi-polar Signal
Hi,
Can any body out there tell me or any schematic how can I interface the Bi-polar signal (+/-1.5v ) signal to my 3.3 v adc working in unidirectional conversion(0-3v) Signal.

Smile
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Circuit_seller



Joined: 23 Sep 2002
Posts: 415
Helped: 15
Post15 Dec 2003 6:42   

Re: Interfacing Uni-polar ADC to Bi-polar Signal
Hi

You can use an op-amp to move your input signal around 1.5v.
Or use a level shifting circuit to do it.

Regards
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artem



Joined: 22 May 2003
Posts: 1652
Helped: 91
Location: Turan
Post15 Dec 2003 10:00   
If DC part is necessary , you can use 3 serially connected diodes powered by current source (to make linear shift) connected to amplifier output .

If just AC will be measured , simple RC with level shift will be enough .
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abasir



Joined: 16 Mar 2002
Posts: 39
Helped: 1
Location: Malaysia
Post16 Dec 2003 1:45   
The simplest is two identical resistors (values depending on your ADC input requirement) as follows:

signal input ----/\/\/-----+----/\/\/-----VDD (3.3V)
connect at + to ADC input.

With above, yr input range is -3.3V to +3.3V.

If you need the smaller range -1.5V to +1.5V, you need some other level shifting circuit Smile
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nebisman



Joined: 13 Apr 2002
Posts: 291
Helped: 1
Post16 Dec 2003 5:40   

Re: Interfacing Uni-polar ADC to Bi-polar Signal
Use a vltaje divisor and a follower with Opamp. Connect your signal to the virtual ground generated in the output of the opamp
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hynix



Joined: 17 Dec 2002
Posts: 92
Location: Inda
Post19 Dec 2003 6:14   

Re: Interfacing Uni-polar ADC to Bi-polar Signal
Hi,
Intresting !!!

My signal varies +/-1.7v max from the 0v Reference
I wanted to shift the signal to a fixed level of 1.7v from the 0v reference
so that the signal should oscillate at the dc shift of 1.7v making +/- 3.4v from 0v reference
and then I can give to a unipolar adc (0 to 3.4v full scaled) for the conversion.

please sugest me some more idea or shematic.


Smile

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