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RE: DAC Output Stage - order placed!

Posted by bcherry (M) on January 2, 2010 at 16:53:41

In Reply to: DAC Output Stage - order placed! posted by Mikey on December 31, 2009 at 08:13:26:

>DAC pin 26 (L-) to UTS terminal 'in L'

Please remember to connect a 51 Ohm resistor in parallel to in L and to connect Vcom & Gnd.

This gives the correct output levels for a 7.8mA Current output.

> DAC pin 25 (L+) to 22 ohm resistor, resistor to GND

Yes .

> DAC pin 18 (R-) to UTS terminal 'in R'

See notes for L-.

> DAC pin 17 (R+) to 22 ohm resistor, resistor to GND

Yes.

> In the Denon schematic, all four AGND pins (16, 19, 24, 27) are tied
> together....this will be my analog ground, correct?

Yes.

> If correct, let's call this GND.

Ok.

> GND to UTS terminal 'Gnd L'
> GND to UTS terminal 'Gnd R'
> GND to UTS terminal 'Vcom L'
> GND to UTS terminal 'Vcom R'

Yes.

> The schematic on page 22 of the manual shows (4) 51 ohm resistors.
> What do I do about those?

The two for the inputs to the UTS stay, the other two become 22 Ohm.

> I could locate the 22 ohm resistors close to the DAC chip, or I could mount
> them somewhere on the UTS....which is preferred?

Makes little difference, just do what is most convenient to do.

And of course you must disconnect the existing I/V conversion stages in the Denon Player (cut trace or remove Op-Amp and Op-Amp feedback resistor).

regards
DIY - Done Right!

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