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Old 28th January 2012, 01:03 PM   #1011
UnixMan is offline UnixMan  Europe
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Quote:
Originally Posted by 1audio View Post
I suggest (strongly) that you use a transformer for the mclk.
why would you prefer a transformer to an opto? jitter should not be an issue on the uC side, while I'd guess opto should be better for what regards noise isolation.
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Old 28th January 2012, 04:22 PM   #1012
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I have planned for this weekend's new TL431 boards: 0.1 uF capacitor replaced by 100 uF(I think probably not necessary but I'm going to try) and for analog supply AVCC: 2200 Oh. to 120 Oh. which lowers the output impedance.

It has to be measured. And then make listening tests. But these two things do not change their board, they are just different values.

The Demian circuit has two qualities in the analog AVCC AB-1.1, This circut works well with only 5 V. input. It can get better analog source supply but it takes a higher initial voltage. The other is flat impedance with frequency, and I hope that lower impedance get more in dynamic.
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Old 28th January 2012, 10:00 PM   #1013
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Quote:
Originally Posted by GeorgeBoudreau View Post
I finally got around to assembling my USB5102 DAC card.
Nice. Have you seen this:

PCM5102, 2VRMS ground centered direct output with two digital filters

Question: which setting have you used for the filter? is it possible to switch between the FIR and IIR mode?

What about the sound, how does it compare WRT the ES9023?
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Old 28th January 2012, 10:21 PM   #1014
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The filter switching is done by a control line from the processor. Alex modified the configuration program to support the function. Alex just notified me of the modification and I have not tried it yet.

Sound Quality: My ears are too old to tell the difference between my two cards. I just design 'em and let others beat them to death.

George

Quote:
Originally Posted by UnixMan View Post
Nice. Have you seen this:

PCM5102, 2VRMS ground centered direct output with two digital filters

Question: which setting have you used for the filter? is it possible to switch between the FIR and IIR mode?

What about the sound, how does it compare to the ES9023?
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Old 28th January 2012, 10:52 PM   #1015
1audio is offline 1audio  United States
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Default Latest version of the power supply + clock

Below is the latest version of the supply regulator as it was intended to be used. The transformer isolation is also shown. The idea is to remove as much stuff as possible from leaking back into the oscillator. The secondary of the transformer should be connected as close as possible to the clock distribution/clocked device. The 100 pF caps will probably need to be bigger.

Why a transformer if the jitter is isolated? Follow this- you have two fairly closely located signals of about the same frequency and its RF so they can detect the radiation from each other. Oscillators when close will tend to lock to each other, and map noise and jitter to each other. If we have a jittery signal at the same frequency as the clock it could pick up some of that jitter. This is a real phenomena. For precision measurements of phase noise NIST has amplifiers with 180 dB of reverse isolation to prevent this. We don't need to go that far but keeping it clean with a transformer is not a major burden. And the coupling won't be much more than the opto.
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File Type: jpg XO Supply Noise Filter v2.JPG (83.4 KB, 398 views)
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Old 28th January 2012, 11:44 PM   #1016
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Demian.

In version AB1.1 is impossible to put R1 5 Oh. : (

Unfortunately I just finished the boards without resistance R14. : Eek:
Do you think it is absolutely necessary? Is it for protection or improvement on noise?

I'd have to cut tracks and add in half if necessary. : (
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Old 28th January 2012, 11:55 PM   #1017
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Neither R1 nor R14 are necessary. They help to isolate the oscillator subsection from nearby noise. Without them you just need to be very aware of ground connections and currents on shared grounds.
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Old 29th January 2012, 02:32 AM   #1018
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Hi USB5102 users:

You can use the firmware and WidgetControl GUI tool for the ES9023 based audio-widgets for USB5102. However, to be able to configure the USB5102 to use FIR or IIR fitler, you need the new firmware and the WidgetControl GUI tool to set things up.

The new firmware is here:
audio-widget-PCM5012-2012-01-29.elf - sdr-widget - Unified firmware for audio-widget USB5102 from George. You can installed this firmware for other audio-widgets such as ES9023, but you have to do factory reset and setup properly using WidgetControl

You need to use WidgetControl GUI tool to set things up before the USB5102 will work properly. You also use the GUI tool to select the filter mode, FIR or IIR. Once the features are selected, you reset the USB5102 by pressing and releasing the "RESET" button on the USB5102. The feature selections are stored in the non-volatile memory of the widget and will remain there until you change it the next time.

The Windows WidgetControl GUI tool is here:
WidgetControl GUI Tool for PCM5102 2012-01-29.zip - sdr-widget - WidgetControl GUI tool for PCM5102 audio-widgets. packaged for Windows 2012-01-29 Extract into 'dist' directory and run 'WidgetControl.exe' You may need some Windows system .dll files t

The Linux WidgetControl GUI tool si here:
WidgetControlGUI for PCM5102 - 2012-01-29.tar.gz - sdr-widget - WigetControl GUI tool for PCM5102 audio-widgets. For Linux You need python26, pythoncard, wxpython2.8, pyusb etc. installed. - Audio and Control Interface for Amateur Radio SDR and Audio

Now for ES9023 audio-widget users:

You should stick with the non-PCM5102 firmware and WidgetControl GUI tool. However, it is possible to flash the PCM5102 version of the firmware for the ES9023 audio-widgets. BUT you MUST do a factory reset and ONLY use the PCM512 version of the WidgetControl GUI tool to set up your audio-widget before use. The FIR/IIR selection setting will NOT affect your widget as the ES9023 has no selectable digital filter. For your information all my ES9023 based audio-widgets are now running the latest PCM5102 firmware.

Currently the FIR/IIR settings are fixed and stored in the non-volatile memory, and you can change it by using the WidgetControl GUI tool to set it to a new setting and then RESET the widget for it to take effect.

In future our plan is to develop another GUI tool that is used to control the audio-widgets in RUN TIME. That is, you can change the settings when the widget is playing music. Of course, this will only be useful for some settings only. There will be other settings that SHOULD NOT be changed in run time. This will be more relevant when we have i2c controllable DAC's such as ES9018 or WMxxxx.

Alex
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Old 30th January 2012, 08:29 AM   #1019
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Hi Demian,

thanks for the schematic. Do you recommend one regulator circuit per XO? Do you also recommend it for the DAC chip?

As you know, the XOs on the AB-1.1 are shorted together with 68R resistors while their enable pins are in opposite phase. I don't know how much is actually turned off in there then.

BÝrge

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Originally Posted by 1audio View Post
Below is the latest version of the supply regulator as it was intended to be used.....
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Old 30th January 2012, 08:31 AM   #1020
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Hi Alex,

I assume the new branch is a direct decendant from audio-widget-nik. Is that correct?

BÝrge

Quote:
Originally Posted by alexlee188 View Post
Hi USB5102 users:
You can use the firmware and WidgetControl GUI tool for the ES9023 based audio-widgets for USB5102. However, to be able to configure the USB5102 to use FIR or IIR fitler, you need the new firmware and the WidgetControl GUI tool to set things up.Alex
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