pcm63pk in piggy back mode.

[AnthonyAsh]

Originally posted by Dr.H
Fumihiko san, Konnichiwa

Thanks for the interesting response! I am not sure which capacitor you refer to.

Pin 1 is the servo decouple
Pin 3 is the reference decouple
Pin 4 is the Offset decouple
Pin 9 is the Rfeedback pin
Pin 10 is connected to pin 9
Pin 23 is the "Upper B2 ADJ" pin
Pin 24 is the "lower B2 ADJ" pin
Pin 25 is "potentiometer voltage" pin

Of these pins, 23, 24, 1, 3 and 4 are decoupled to ground through caps, so I would assume you are refering to these capacitors?

What do you do with pin 9 and 10 which appear to be used by the analog outputs stage op-amps? Do you connect them to your IV stage? If so they are effectively in parallel with the existing DAC.

Thanks for your input, domoarrigoto
Ryan

Dear Mr.Fumihiko san, Konnichiwa

Do you have a diagramm?

Sincerely,A

[fumihiko]

is it?
http://www.alldatasheet.com/datashee...OWN/PCM63.html

[AnthonyAsh]

Originally posted by fumihiko
is it?
http://www.alldatasheet.com/datashee...OWN/PCM63.html

Not datasheet,but schematics of how you connected 2 pcm63 toghether.

[Bernhard]

Originally posted by AnthonyAsh


Not datasheet,but schematics of how you connected 2 pcm63 toghether.

It is easy, parallel means connect Iout together.
And digital lines.
And grounds.
And supply rails. Or give one extra supply each chip.
But not individual (decoupling) pins.

This is why TDA1541 can not be stacked. Lots of individual decoupling pins. All must be placed on the pcb.

TDA1543 can be stacked. Very simple "tcheap".

[fumihiko]

AnthonyAsh san KONNICHIWA

Not datasheet,but schematics of how you connected 2 pcm63 toghether.

my piggy back PCM63 and NJM2114

[Dr.H]

Fumihiko san Konnichiwa

Thanks for the pictures. Just a couple of questions:
1. Did you connect Pin 5 of the upper and lower chips together, i.e. are they in parallel like pin 18?
2. Did you connect Pin 1 to the -V supply via its own independant capacitor?

Finally, vs the single chip, what are the sonic benefits of going with the parallel setup?

Thanks
Ryan

[fumihiko]

Dear Dr.H san

1. Did you connect Pin 5 of the upper and lower chips together, i.e. are they in parallel like pin 18?

pin5,6,7,11,12,13,18,20,21,28 connected upper and lower.

pin1 to -V supply via own independent capacitor.
pin3 and 4, via own independent capacitor

[Dr.H]

Fumihiko san,

Thanks! What would you describe as the benefits of using the parallel chips vs just using one chip?

I will try the mod sometime in the near future and post my results here. Thanks for your input!

Ryan

[AnthonyAsh]

Originally posted by Dr.H
Fumihiko san,

Thanks! What would you describe as the benefits of using the parallel chips vs just using one chip?

I will try the mod sometime in the near future and post my results here. Thanks for your input!

Ryan

Dear Mr. Fumihiko,

For me is also very interesting what you gain when you used your pcm63 config?

[fumihiko]

Dear

what a difference ,single DAC and multiple DAC?

single use , it is thin sound
dual , what a different?
triple , good sound!
quad , I was surprised

8 paralelled , had been moved!

I heard and compared, accuphase DC-91
just a little difference.

I think,best solution is 4 to 8 paralleled DAC
actually, accuphase paralleled 4 to 8.

now I try 4 paralled CS4334