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Frequently Asked Questions - FAQ
What are USB standards 1.0, 1.1, 2.0 and USB bus speeds 1.5Mbps, 12Mbps, 480Mbps?
USB was initially release in version 1.0 in 1996, which was soon upgraded to 1.1 in 1998 and supports 2 bus speeds - Low Speed (1.5Mbps) and Full Speed (12Mbps). USB 2.0 was released in 2000 and supports Low Speed, Full Speed and High Speed (480Mbps).
A USB 2.0 device can either be Low Speed, Full Speed or High Speed. Devices are mostly backward compatible to support lower speeds - but this is not a demand.
USB2ISO support 12mbit Full Speed only. A 480mbit device and HighSpeed USB host (PC/HUB) with the USB2ISO in between will fall back to 12mbit - some devices needs the full bandwidth to operate correctly. Low speed devices which are keyboard, mouse, etc. do not work with the USB2ISO out of the box. The USB2ISO can be delivered in low speed edition (Stuffing option) - if anyone wants this please write an email and we will add the low speed product to the shop.
Download Microsoft USBVIEW.EXE 32bit program to see speed of windows attached USB devices
Download Microsoft USBVIEW.EXE (64bit Win7-11) program to see speed of windows attached USB devices
Download Microsoft VC2013 Runtime (64bit Win7-11) needed for Win7-11 USBVIEW.EXE 64bit
Here is some info to the AUDIO ground looping problem heard as humming noise, bas distortion, etc.:
Quality USB/SPDIF cables
A quality cable USB/SPDIF will not remove the degradation of sound when using an USB->DAC or an USB->SPDIF adaptors and thereby creating a ground loop. The problem is that a small difference in ground level will influence the audio signal. Prober grounding technique with a thick green/yellow ground wire will help the best - but the problem can still exist as the DACs deliver audiosignals with signal level of only 100mV (0.1V).
The so called quality USB and SPDIF cables are only good for a few purposes - extending the limit of cable length or/and if they have a huge chunk on it - remove EMC problems that would otherwise prohibit the device from being sold.
Some USB cables have built in power noise filtering - they might be good for low cost USB->DAC/SPDIF. Still needs to be used with the isolator and No guarantee, they will improve your audio signal.
External powersupply is not a good solution.
The powersupply must be totally isolated (Class 3) to avoid making a new ground loop connection - most small DC power adaptors are Class 2, which have a cap to ground.
The powersupply noise on the 5V will not influence the audio signal, because most audio DACs use 3V which they get from at LDO inside the DAC module. Also remember that the noise is ontop of 5v and easily cleaned by the caps used inside the DAC module. A standard PC can have noise in amount of 250mV - but will be reduced to 50mv through the isolated DCDC.
Jitter on USB
USB signal jitter does not influence the audio signal. But USB is quite a hassle for audio designers because it is packet based and the packets are not spaced evenly. The jitter in packets is solved in many ways. The Analog Device Adum chip used in the USB2ISO will not remove signal jitter and will not introduce any jitter.
All full-speed USB devices working great with USB2ISO!!
Eventhough the USB2ISO is a Full Speed isolator some HighSpeed devices might work with the adapter and some do not work - here are lists for highspeed devices that work and do not work:
List of USB High Speed Devices having problems running at Full Speed with the USB2ISO
1. Hiface USB 2.0 - Sound card SPDIF 24bit 192KHz (Reason - must have 480Mbit HighSpeed USB)
2. Pod Line 6 X3 Live - Guitar Pedal - needs 480Mbit HighSpeed USB
3. Audio 8 DJ audio Interface (Must have 480mbit Highspeed USB)
4. Eastern Electric MiniMax M2Tech 24bit 192khz (Must have 480mbit Highspeed USB)
5. Roland octacapture UA-1010 (Must have 480mbit Highspeed USB)
6. Stello U3 (Must have 480mbit Highspeed USB)
7. Presonus AudioBox 1818VSL (Must have 480mbit Highspeed USB)
In general all USB sound cards having 8 channels or more must have 480mbit to work (BW=1MB/s < 44KHz*2(16bit)*8)
Positive list of High Speed USB 480Mbit devices working with USB2ISO in Full Speed
1. Oscilloscope Tenma 72-8240 (
2. Musiland Sound Card SPDIF 24bit 192KHz
Please report if you find a full speed device that does not work problem free with USB2ISO, thanx!
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