Legato for PCM1704

[merlin el mago]

Wich be the right input voltage for Legato driving unbalanced BB PCM1704?

 

[Russ White]

The the input bias to 0V (or close).

Which version of legato?

 

[merlin el mago]

Sorry I forgot, Version 1.0.3

 

[Russ White]

Will you be using balanced output or single ended only?

 

[merlin el mago]

PCM1704 is single ended

 

[Russ White]

Ahh, I see. Well you could still use Legato, but the BAL/SE stage you would want to completely omit.

 

[merlin el mago]

Only it's necessary the input bias to 0V (or close)?

It's not necessary ground the input - (cold)?

No need to change some resistor CCS & I/V?

 

[Russ White]

I would have to look at the datasheet. I simply don't have time at the moment. If you grounded one end (-end is fine) then it should work, but it would definitely not be ideal. Your going to have to research this yourself for the moment.

 

[merlin el mago]

Thank you, only one question more: wich are CCS Rs (R6-R8) & I/V Rs (R21-R24)?

 

[Russ White]

Thank you, only one question more: wich are CCS Rs (R6-R8) & I/V Rs (R21-R24)?

R20,R21 R23,R24 are CCS

R1-R4 are I/V

 

[merlin el mago]

Thanks Russ

 

[merlin el mago]

I would have to look at the datasheet. I simply don't have time at the moment. If you grounded one end (-end is fine) then it should work, but it would definitely not be ideal. Your going to have to research this yourself for the moment.

If I understod correctly I grounded the Legato input negative to ground & used only the balanced output GND & +, that's correct?

 

[merlin el mago]

bump

 

[merlin el mago]

bump

 

[Russ White]

Merlin, your just going to have to figure this one out on your own. I don't have that DAC to test nor do I really have any interest in it. I am guessing you will simply want to setup the Legato for about 4X its normal current to voltage ratio. Refer to the manual on that.