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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 25th April 2021, 06:57 PM   #10141
danny_66 is offline danny_66  Belgium
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0V ?
I think there's some varnish in the vias that isolates it.
See if you can measure ground there.
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Old 25th April 2021, 08:19 PM   #10142
ripson is online now ripson  Europe
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Originally Posted by danny_66 View Post
0V ?
I think there's some varnish in the vias that isolates it.
See if you can measure ground there.

yeah, I already found it, added 2000u polymer

Sara K. from Chesky Records sounds even better... after an hour or so I touched the cap, it was warm.
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Old 26th April 2021, 09:08 AM   #10143
danny_66 is offline danny_66  Belgium
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Now after the mods, you have a very good DAC
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Old 26th April 2021, 01:06 PM   #10144
PavZ is offline PavZ
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Dear Soeren, could you give any estimates about a new boards batch availability? Personally I would happily buy previous generation if it is still available while the new generation is far away.
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Old 26th April 2021, 01:53 PM   #10145
cab is offline cab  United States
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So what was it before the mods?
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Old 26th April 2021, 02:28 PM   #10146
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Default dam 1021 rev7

So, the dam1021 rev7 is about to ship.... I have put a picture of the rev7 up on my website, and as people as usually are going to ask question, let me try to answers them up from:

1) it use the same FPGA and same uC as usual, so should be able to use same firmware, there are some differences, so new firmware are needed and will autodetect board.

2) The shift registers are now also in the smaller qfn packaging as used on other boards, so I don't need to stock the tssop types anymore....

3) Output shift registers now running at 1.4M/1.5M sample rate, making FIR2 filter different. Will require new filter file, but plan to use same filter file for both old and new boards, firmware will load filters as needed.

4) The R-2R network is now 24+3+1, ie 24 bit classic R-2R network, 3 bit thermometer network, plus the sign, total 28 bits.

5) Yes, still same Si514 clock, but now in a small package (like I use on other boards), and it drives the shift registers directly, no added jitter by going though the FPGA. People who want to bitch about the Si514, please go elsewhere, we have heard you multiple times....

6) The clock Power supply is separate and use a LP2907 low noise regulator.

7) New vref supplies, like used on the dac2541. For those who want details, yes it use a opamp with transistor buffer, with a polymer output capacitor. Lower vref impedance from DC to Megahertz.

8) Those are powered at +-5.4V from LM317/LM337 pre regulators.

9) Output opamps are opa1678.

10) Power in are now DC only, optimal is +- 9V.

11) The board is mechanical and almost electrical compatible with previous version of the dam1021.

12) J9 is 4 bits user i/o, planning to use it for additional SPDIF inputs.

13) The non isolated serial management port is now TTL levels, not real RS232 levels. So get the right USB to serial adapter....

I know people want to experiment anyway, but there is nothing to gain by vref or power supply modifications....

To simplyfying stock keeping I will probably only make dam1021-12.
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Last edited by soekris; 26th April 2021 at 02:36 PM.
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Old 26th April 2021, 02:40 PM   #10147
andrea_mori is offline andrea_mori  Italy
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by soekris View Post
5) Yes, still same Si514 clock, but now in a small package (like I use on other boards), and it drives the shift registers directly, no added jitter by going though the FPGA. People who want to bitch about the Si514, please go elsewhere, we have heard you multiple times....
I didn't think you have the exclusive property of this thread, I thought it was a public thread.

And it's really curious that you get your hands ahead about the Si514, the Si570 was too expensive?
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Old 26th April 2021, 02:55 PM   #10148
living sounds is offline living sounds  Germany
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Looks great. So J10 is gone?

I will try this one, but probably not replace the 16 DAM1021 boards in my multichannel converter...

Soeren, could you please also give us an estimate regarding the overhaul of the clocking software? Thanks!
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Old 26th April 2021, 06:59 PM   #10149
baten is offline baten
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Originally Posted by andrea_mori View Post
I didn't think you have the exclusive property of this thread, I thought it was a public thread.
Holy sh*t andrea, it's literally the guy behind all soekris products. You're going to run it in his place, maybe? Move on, plenty of other threads to continue your usual discussions.

@soekris, thanks for the info about rev7.
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Old 26th April 2021, 07:12 PM   #10150
andrea_mori is offline andrea_mori  Italy
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by baten View Post
Holy sh*t andrea, it's literally the guy behind all soekris products. You're going to run it in his place, maybe? Move on, plenty of other threads to continue your usual discussions.

@soekris, thanks for the info about rev7.
This thread is public and even I'm a customer so ...

... so I believe I don't need your permission to post my comments.
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