DAC AD1862: Almost THT, I2S input, NOS, R-2R - Page 140

miro1360 · 21st January 2021, 12:04 PM

Expect this as "safe minimum" with LM6171 in the I/V:
+-40mA for digital (+-5V)
+-60mA for analog (+-12V)
The real consumption will be less (perhaps half of that).

Schematic examples in datasheet are for both "high performance" and "high resolution" on +-5V digital supply. I would say, the larger the voltage difference between analog and digital (analog > digital), the less the possibility of digital interference - but that's a humble theory unless we see the internal diagram of the AD1862

jimk04 · 21st January 2021, 02:21 PM

Good information thankyou

Vunce · 21st January 2021, 02:50 PM

Even with Burson discrete opamps installed I measured less than +/-60mA current draw on the 12v supply.

miro1360 · 21st January 2021, 05:04 PM

Is not that perfect

The low current consumption minimizes the demand on heatsinks in shunt regulators.

jimk04 · 22nd January 2021, 04:35 PM

Thanks for that.

And.....my chips have landed...along with a PCB

.and also a big Mouser order....woo hoo!

Paddy Garcia · 22nd January 2021, 04:38 PM

Sounds like a fun weekend ahead!

jimk04 · 22nd January 2021, 04:39 PM

Sorry this should have gone in the GB thread!

miro1360 · 23rd January 2021, 08:46 AM

Why NOS DAC is better?
Because direct comparison often proved better sound. Some describe NOS-DACs as more vinyl-like in their sound. Oversampling DACs can sound a bit ringing, sometimes a bit muted or veiled.

If the oversampling has 8x multiplier, then only 1 out of 8 sampling points is the original record information, and the remaining 7 sampling points are derived from an interpolation calculation. How trusty are those 7 calculations? ... what about 32x multiplier

In complex frequencies/music sometimes less information is more, naturalness.
Just adding here my thoughts

redjr · 28th January 2021, 05:23 PM

Quote:

Originally Posted by Vunce

The Digital input selector based on the AK4118 chip arrived. It has SPDIF x4 + USB x1 inputs to I2S output with a screen that shows locked status and sampling rate. Works very nice! No pops/clicks when switching inputs either

Where did you pick up the input selector board? eBay? Link?

redjr · 29th January 2021, 02:29 AM

Never mind Vunce. I read a little further and saw the link from Audiophonics.

22nd January 2021, 04:38 PM	#1396
Paddy Garcia diyAudio Member Join Date: Apr 2014	Sounds like a fun weekend ahead! __________________ Currently enjoying: miro's AD1862 DAC -> B1 Korg -> 3e TPA3255 -> Kef 104/2

29th January 2021, 02:29 AM	#1400
redjr diyAudio Member Join Date: May 2011 Location: CT	Never mind Vunce. I read a little further and saw the link from Audiophonics. __________________ redjr

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21st January 2021, 12:04 PM	#1391
miro1360 diyAudio Member Join Date: Mar 2010	Expect this as "safe minimum" with LM6171 in the I/V: +-40mA for digital (+-5V) +-60mA for analog (+-12V) The real consumption will be less (perhaps half of that). Schematic examples in datasheet are for both "high performance" and "high resolution" on +-5V digital supply. I would say, the larger the voltage difference between analog and digital (analog > digital), the less the possibility of digital interference - but that's a humble theory unless we see the internal diagram of the AD1862

21st January 2021, 02:21 PM	#1392
jimk04 diyAudio Member Join Date: Jul 2018 Location: North Notts	Good information thankyou

21st January 2021, 02:50 PM	#1393
Vunce diyAudio Member Join Date: Jan 2014 Location: LI, NY	Even with Burson discrete opamps installed I measured less than +/-60mA current draw on the 12v supply.

21st January 2021, 05:04 PM	#1394
miro1360 diyAudio Member Join Date: Mar 2010	Is not that perfect The low current consumption minimizes the demand on heatsinks in shunt regulators.

22nd January 2021, 04:35 PM	#1395
jimk04 diyAudio Member Join Date: Jul 2018 Location: North Notts	Thanks for that. And.....my chips have landed...along with a PCB .and also a big Mouser order....woo hoo!

22nd January 2021, 04:39 PM	#1397
jimk04 diyAudio Member Join Date: Jul 2018 Location: North Notts	Sorry this should have gone in the GB thread!

23rd January 2021, 08:46 AM	#1398
miro1360 diyAudio Member Join Date: Mar 2010	Why NOS DAC is better? Because direct comparison often proved better sound. Some describe NOS-DACs as more vinyl-like in their sound. Oversampling DACs can sound a bit ringing, sometimes a bit muted or veiled. If the oversampling has 8x multiplier, then only 1 out of 8 sampling points is the original record information, and the remaining 7 sampling points are derived from an interpolation calculation. How trusty are those 7 calculations? ... what about 32x multiplier In complex frequencies/music sometimes less information is more, naturalness. Just adding here my thoughts