DAC

[SKK]

Hi all!

I have some questions regarding DAC circuit.
I've heard that some DACs and AV receivers use
multiple DAC chips per channel, like 2, 4, or even 8
chips per channel. They say that using multiple chips
improves dynamic range and distortion. But I don't know
what rationale supports such a claim. Could someone out
there enlighten me on this?

Actually, I've even seen a picture where one DAC chip is
piggybacked on another chip. And datasheets from Analog
Devices (AD1852, AD1853) actually show mono circuits
in which ROUT+ and LOUT- (LOUT+ and ROUT-) of a chip are
wired together and supplied to an analog stage.
If such a scheme is really effective, I'd like to give
a shot some day...

[Dave]

Connecting DAC chips in parallel improves the signal to noise ratio and dynamic range. I have not tried it myself so I couldn't comment on the sound. The other option which I am going to implement on my next DAC is a fully balanced configuration. Two DACs per channel one producing the inverted signal the other the non-inverted. A differential amplifier then amplifies these.

[richt]

hi folks

if someone can answer me a question/

it will be appreciated!

on my cd player have a 1 bit dac with a 33.868 meg clock,
the dac divides that clck to be feed to the servo dsp.

the servo dsp generates the l/r data,44.1khz for left & right channel separation & a 3rd signal that i dont know if it is a word clock or bit clock???

this 3 signal goes to the dac again.

i made a reshape on the 3rd signal & the inprovment was so huge that i am willing to trade info with someone that
can make or design a clock reshaper unit!!

thanks
richt
h

[Dave]

Is the clock generated by the DAC chip and sent from there to the Servo DSP?
The servo DSP will probably send back a DATA line, a Bit clock and a left/right clock.

[richt]

hi dave

thank you for your info.

i made a clock reshape on the bit clock that goes to the dac
and the difference was huge!!!!
now im going to install the superclock too!

thanks
richt