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I am looking for 16-bit version DAC which performance is like DAC8821 and which function is similar to AD5443 (12-bit multiplying DAC).And I plan to use it like below circuit.There is about 2V differences between Iout2 and Digital GND.Could you tell me the recommended DAC?
Kevin DukeDAC Applications Manager
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In reply to Duke of DACs:
Sorry for interrupt you.
But I would like you to confirm about below.
>The reference design points out all of the TI DACs that feature this architecture which include DAC7811, DAC7821, DAC7822, and DAC8820.
Actually, DAC8820 separate DGND and AGND, however, I guess that this is not same spec as DAC78xx.
Here is block diagram of DAC7811.
According to this, TI define spec "Iout 1 to GND" and "Iout 2 to GND".
However, in case of DAC8820,
TI define "Iout to GND" but not define "AGND to DGND".
So I understood that user can separate GND, however not to insert bias voltage to AGND.
So, could you please re-confirm user can apply TIDP-157 for DAC8820 ?
In reply to Ryuuichi machida:
Thank you for your reply.
BTW, could you please send me your comment about following circuit ?
I think that user can apply offset voltage in above circuit as well. I think if user can use this circuit it is better from viewpoint of following two.
1. User do not take care impedance of bias source
2. There is no requirement which AGND and DGND need to separate for DAC.
I'm not sure why TI introduce following circuit in application note(tidu300.pdf). If you know the advantage of following circuit, could you please explain ?
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