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Old 23rd May 2005, 10:58 AM   #1
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Default digital design summary overview

ok I am fairly new to this so I thought I would offer a brief guide, if I have missed anything, please add to it.

dacs:

burr brown
analog devices
crystal
dcs ring dac
npc
philips
wolfson



which is best? BB?


dig filter
FIR a la wadia/pioneer
or
IIR which is the usual.

I-V options

resistor
transformer : both 'passive'

inverting opamp I-V or
discrete stage

LPF
bessel function, any others?
usually 3rd order

I suspect apart from the dac and filter choice, this is the area that determines the sound as its most tweakable am I correct?

unity gain buffer
opamp or discrete

anyone care to elaborate on the points?
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Old 23rd May 2005, 01:21 PM   #2
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Default Re: digital design summary overview

Quote:
Originally posted by lt cdr data


dig filter
FIR a la wadia/pioneer
or
IIR which is the usual.


What is the basis for this statement? It seems wrong.
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Old 23rd May 2005, 01:21 PM   #3
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Default Re: digital design summary overview

Quote:
Originally posted by lt cdr data

anyone care to elaborate on the points?

If I may add some themes

- jitter
- (PCB)layout
- power supply (noise, output impedance, bandwidth)

Personally I am OK with PCM1704 with active IV

cheers
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Old 23rd May 2005, 01:49 PM   #4
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Default Re: Re: digital design summary overview

Quote:
Originally posted by Guido Tent


Personally I am OK with PCM1704 with active IV

cheers

Why the departure from the passive i/v in your PCM63 dac and would the active i/v be opamp or discrete ?
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Old 23rd May 2005, 02:18 PM   #5
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Default Re: Re: Re: digital design summary overview

Quote:
Originally posted by rfbrw



Why the departure from the passive i/v in your PCM63 dac and would the active i/v be opamp or discrete ?
10 years difference.....

regards
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Old 23rd May 2005, 05:39 PM   #6
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Default Re: Re: Re: digital design summary overview

Quote:
Originally posted by rfbrw


would the active i/v be opamp or discrete ?
Opamps: I can live with AD797 or OPA627 (assumed the power supplies are OK

Discrete: Yes, tubes and transistors are still OK
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