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Old 14th October 2002, 03:28 PM   #1
MWP is offline MWP  Australia
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Default IV for PCM1730

Hi all...

The PCM1730 has balanced current outputs labeled as IOUT+ and IOUT-.

The PDF shows a "typical" IV stage which consists of a opamp based IV for each half of the output followed by a summing opamp.

I wish to stick to opamps for the IV (OPA637's), but was wondering if i can use only one half of the output which will cut the number of opamps needed.

I found a web site which shows the same DAC with this output stage:
Click the image to open in full size.

Will i be comprimsing the quality of the DAC by only using 1/2 of the output like the diagram above?
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Old 17th October 2002, 07:16 AM   #2
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Not quite related, but have a look at this thread I tried to start . Haven't had the time to test it, but I'm still considering using this chip.
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Old 17th October 2002, 09:32 AM   #3
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Default Re: IV for PCM1730

Quote:
Originally posted by MWP
I wish to stick to opamps for the IV (OPA637's), but was wondering if i can use only one half of the output which will cut the number of opamps needed.
OPA637 is not intended for low gains. Use OPA627 instead if you have gain < 5.
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Old 17th October 2002, 12:55 PM   #4
MWP is offline MWP  Australia
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I think im just going to go with the original circuit.
Will be a pain to route on the PCB as it will be using 8 separate 8pin opamps... but its all part of the fun
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Old 17th October 2002, 01:52 PM   #5
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Half the output:

Yes as you have drawn it, quality will suffer. However, if you require only single ended outputs use Iout+ and Iout- on a fully balanced op-amp such as THS4131. You probably don't even need the output buffer, and you certainly don't need R6,7 ...

Petter
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