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The timestamps are taken from the internal 64 bit counter that is incremented by 10 at 100 MHz, so the resolution 1 ns with 10 ns quantization. That 100 MHz is generated by the FPGA's PLL, clocked by the on-board 25 MHz oscillator (stability: 30ppm). The timestamp is caught exactly at the time when ...

Is the E30 powered by the USB bus or by its own power supply?

Hi, the isolator works transparently and is not aware of any specific protocol such as ASIO. When your DAC does not enumerate correctly, this is most likely an USB compatibility issue of the device. In your specific case, this is in fact an issue of the Clarett. We where in tight contact with Focusr...

Example Wireshark session. Now you observe packet direction, SFD, FCS, ... Because the Ethernet Debugger is connected directly to Wireshark via USB, really every frame is going to be listed. This is a huge improvement comparing to traditional wire tap products which go through the hole network stack...

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I found a cheap DAC (Asus Xonar X7) in the lab that uses the CM6632A, which is very similar to the CM6631A. Connected to the iMac in front of me, connected via three different Intona isolators lying around. Worked out of the box. All the different I/O is available and usable. So I guess, it's not th...

Available from August 2020.

When the LED goes off, the isolator is detecting the USB sleep mode. If the Orchid is actually just 100 mA asking, the AUX supply won't help. Nevertheless, you can try it quickly using a standard cell phone loader with USB micro connector. But I guess, this won't help. Well, the isolator does the ha...

There are a lot. Just a few of them: Audio: If you have a Dante, AES67 or AVB network running but don't want to star-wire each loudspeaker. This product enables you to daisy-chain tens of additional nodes. In case of AVB, there will be an additional model with active PTP, as required by the standard...

Here it is.

Available now on request.

As long the 12V for the external HDD is a separate, galvanically isolated supply, I don't see any benefit in isolation. An isolator would be more a protection barrier here. But if the 12V HDD supply is maybe an audiophile style linear supply that is shared to power different devices, you will easily...

Here it is: POEsy.

4-port Daisy Chain Switch. Powered by either POE or DC 5.5/2.1 connector. Provides POE as well.

Available very soon.

There is currently no schedule, but we are aware about the customer demand.
I will let you know when we have some cables available for evaluation.

Edit: Not sure if you have these in USB 2.0, but that is all my current set up uses. Unfortunately, this is available in USB 3.0 configuration only. Look at first photo in this thread, the B-Connector is somewhat higher and only fits into 3.0. Although, this cable can of course transmit both USB 2....

Hi Chris, first, I need to rectify the isolation property: Intona 7055-C - which isolates only the DC current Intona 7055-D - which isolates the AC current This is not correct. All isolators do both AC and DC isolation. The difference is that the amount of isolation is specified differently here. Th...

But you haven't made an argument for completely disregarding strand interaction in USB cable. As noted above, I have heard this myself in audio cables, so why can't it also affect data cables given the lack of data correction in audio DACs and the far higher frequencies involved? Couldn't small amo...

But there is no audio on the USB data lines, just coded data which is decoded as audio in the receiver. USB transmission failure cannot affect audio in sense of sound balance but in another way. If data was corrupted on the cable, the receiver will throw a checksum error. In the normal case of USB, ...

With particular regard to the conductors carrying the USB 2.0 signals, are you using stranded or solid-core wire?

Stranded wire. I am eager to learn about the background of your question. What difference would you expect if it was solid-core?

Nice, but I don't make any statements without having serious measurements on this. Just quoting values out of the datasheet of single components that are just a part of the whole system ain't my style.

Those split cables are just usual hubs and work surprisingly good. Try it.

You can use a Y-split power injection cable for powering the isolator at primary side (and not being a hub):
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I don't know if any earlier or later android version works better.
Your problem is clearly the power delivery and the only thing that I suggest is reducing the setup. Isn't it the case that Regen can power the next device? Then you could use your power bank there.

What happens measurement wise if you use the aux port to power the USB 3.0 SuperSpeed Isolator 5kV instead of using the USB supplied power? Would the choice of psu supplying power to the aux port mean anything for measurements? Good question! The AUX port powers the USB device directly (not the iso...

Minimalist wrote: ↑May 16th, 2020, 4:29 pm Hoping to buy the 7055-C soon as well, once the exchange rate improves.

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Further, how do the jitter measurements compare between the 7054 and 7055-B? Don't confuse USB data jitter with jitter of MCK inside your DAC. They have no relationship to each other. About the USB data jitter, these measurements using our LeCroy SDA-6020 are still valid for 7055: //intona.eu/en/su...

Well, the difference in noise level of 0.0000016 V RMS on the USB VBUS cannot be propagated to the audio outputs of any decent DAC (which has its own filtering/isolation plus the usual PSRR).

Do you happen to have an USB 3.0-B port? Look at the shape on the first photo above. You cannot use the cable if you don't have such a port.

How does the noise of the 7055-B compare with the -C? The 7055-B is based on the same linear regulator as the 7055-C. Because the 7055-C needs to deliver more current for USB 3.0, it has two of those regulators in parallel. And doing things in parallel reduces noise. The measured noise is 2.5/3/6 µ...

As I told above, truely comparable FFT plots need to reflect the noise density in root Hz. Luckily, there is a script available at Audio Precision's website that makes exactly that. There is also a very good explanation about interpreting noise in FFT data: https://www.ap.com/technical-library/fft-s...

And don't worry, it's just ESD...
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There is some interesting measurement about residual noise of the isolator's VBUS output here:
7055-C noise measurements

And yes, we have an ESD gun in our lab and we love to help you to solve your issue.

An always recurring question is how ESD safety can be achieved while maintaining isolation. One thing is that it is quite impossible for a single device for both maintaining 4 or 5 kV isolation and having a path for ESD strikes through the isolated worlds. There are solutions for this, though. One s...

If you have any questions or want me to measure again some specific detail, just follow up on this thread.

Summary: I have shown that using the Intona 7055-C isolator, ripple and noise that come from the USB host is drastically reduced down to the microvolts range.

If you are not familiar with logarithmic scales, I will show you this time the linear scale. That way you can see how dramatic the difference is. This is quite hard to show because there are multiple magnitudes of difference. Without isolator, at a scale of 150 µV (and pretty much overflowed): imac_...

Now let's connect a random, externally powered DAC and play an audio stream (UAC 2.0 isochronous, 48 kHz samplerate, 10 channels utilized with 1 kHz sine tone 0 dBFS). iMac to DAC without isolator. 7.9 mV @ 430 kHz BW: imac_audio_stream.PNG iMac to 7055-C to DAC. 40 µV @ 430 kHz BW : 7055C_imac_audi...

At 22 kHz BW, the 7055-C has a residual idle noise of stunning 890 Nanovolts.

Which is just 200 nV above the noise floor of the measurement system.

At 80 kHz BW, the noise of the 7055-C is just 0.4 µV above the noise floor of the System Two measurement system:

(Inputs of measurement system shorted.)

The bandwidth of the FFT plot is limited to about 80 kHz on this machine. So let's set the measurement bandwidth for the AC reading to 80 kHz, too.
1.9 µV.

Now here is the noise profile of the Intona 7055-C connected to the iMac.
5.9 µV at 430 kHz bandwidth.

Now let's have a look on to the noise profile of the iMac.
5.5 mV, not bad either.

The iMac has the higher noise, so I pick this machine for further measurement.

Btw: the higher the bandwidth, the higher the noise of course. But that "> 500 kHz" on the System Two is inaccurate. I measured its "-3dB bandwidth" using the signal generator of a Picoscope that was lying around: bandwidth_analog_input.PNG Actually 430 kHz. So, the System Two offers selectable meas...

Here is the noise profile of the Rugged Science USB card of the Windows machine (plain output, no isolation). 3.5 mV is pretty good! Please note the red rectangles. The "Amplitude" is the RMS AC value that we are interested in. The "BW" shows the measurement bandwidth for this value. rugged_science....

I have two USB host candidates available here which are known to me very well. The first one is my iMac (27" 5k 2019 model) that I use for common development tasks. The second one is one of our CAD-workstations running Windows 7. It is equipped with the highly professional Rugged Science UE-1004 4-p...

This way, the power supply lines of any USB device can be tapped without breaking the shielding:

To make a proper, shielded connection, a special USB-to-XLR tap probe has been build: usb_to_xlr.jpg The data lines D+/D- are untouched, the VBUS is tapped and tied to XLR pin 2, GND to pin 3. The shielding is wrapped, soldered all around to copper tape and to pin 1 and the shell. Of course, there i...

Some words about how things are measured and what they indicate. I am going to measure residual AC ripple on the power supply lines at the USB connector. These are called +VBUS and GND, having a DC potential of 5 volts. The USB device may or may not use these lines to power itself partly or complete...

oslo wrote: ↑May 8th, 2020, 7:53 pm1 meter.

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I was asked several times if I can show facts about residual power supply noise of the 7055 USB isolator series. Well, measurements during the development phase were promising and now that production of the 7055 becomes mature, we are can carry on doing some serious characterization. Accurately meas...

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