MiniDSP USBStreamer Box Manual de usuario

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 1

USBSTREAMER

MULTI-CHANNEL USB AUDIO INTERFACE

TOSLINK/ADAT

BOX VERSION

TOSLINK/ADAT/I2S/TDM

KIT VERSION

User Manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 2

Revision history

Revision

Description

Date

1.0

User manual –Initial version

20-06-2012

1.1

Mac OSx configuration

09-08-2012

1.2

Adding USBStreamer B information + Win8 setup

26-05-2014

1.3

Updated installation procedure, Mac firmware update

22 March 2016

1.4

More detailed I2S information

25 March 2016

1.5

TDM firmware details

28 Aug 2017

1.6

Add TDM16 support

24 May 2018

1.6a

Added 3rd party logos

8 July 2019

1.7

Updated firmware procedure; added new firmware;

improved firmware description and diagrams

8 December 2019

1.8

Minor corrections

10 December 2019

 
 
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 3 
TABLE OF CONTENTS 
IMPORTANT INFORMATION.......................................................................................................................................4
1Product Overview ................................................................................................................................................6
2Connectivity .........................................................................................................................................................7
1 USB .............................................................................................................................................................7
2 Optical.........................................................................................................................................................7
3 External power (kit version) .......................................................................................................................7
4 Logic-Level I/O (kit version)........................................................................................................................8
4.1 Overview.............................................................................................................................................8
4.2 Headers and pinouts...........................................................................................................................9
4.3 I2S .................................................................................................................................................... 10 
4.4 TDM ................................................................................................................................................. 12 
3Firmware versions............................................................................................................................................. 14 
1 LowSampleRate....................................................................................................................................... 14 
2 Stereo ...................................................................................................................................................... 15 
3 I2S_TOSLINK ............................................................................................................................................ 16 
4 ADAT_I2S ................................................................................................................................................. 17 
5 TDM ......................................................................................................................................................... 18 
6 Sample rate summary.............................................................................................................................. 19 
4Installation and Configuration –Windows ....................................................................................................... 20 
1 Download ................................................................................................................................................ 20 
2 USB driver installation............................................................................................................................. 20 
3 Loading firmware..................................................................................................................................... 21 
4 UAC2 Control Panel ................................................................................................................................. 23 
4.1 Status............................................................................................................................................... 23 
4.2 Format ............................................................................................................................................. 23 
4.3 Clock source..................................................................................................................................... 24 
4.4 Buffer settings ................................................................................................................................. 24 
4.5 Volume............................................................................................................................................. 25 
4.6 Info................................................................................................................................................... 26 
4.7 About............................................................................................................................................... 26 
5Installation and Configuration –Mac OS X ....................................................................................................... 27 
1 Download ................................................................................................................................................ 27 
2 Loading firmware..................................................................................................................................... 28 
3 Configuration in Audio MIDI Setup ......................................................................................................... 30 
6Additional Information ..................................................................................................................................... 33 
1 Specifications........................................................................................................................................... 33 
2 Obtaining support.................................................................................................................................... 33 
 

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 4

IMPORTANT INFORMATION

Please read the following information before use. In case of any questions, please contact miniDSP via the support

portal at minidsp.desk.com.

SYSTEM REQUIREMENTS -WINDOWS

•1GHz or higher processor clock speed recommended / Intel® Pentium®/Celeron® family, or AMD K6®/AMD

Athlon®/AMD Duron® family, or compatible processor recommended.

•512 megabytes (MB) of RAM or higher recommended

•One free USB 2.0 port

•Microsoft• ® Windows® XP SP2/Vista/Win7/Win8/Win10

SYSTEM REQUIREMENTS –MAC OS X

•Intel Core Duo processor or greater

•256 megabytes (MB) of RAM or higher recommended

•One free USB 2.0 port

•OS X 10.8 (Mountain Lion) or later, macOS 10.12 (Sierra) or later

DISCLAIMER/WARNING

miniDSP cannot be held responsible for any damage that may result from the improper use or incorrect

configuration of this product. Please read this manual carefully to ensure that you fully understand how to operate

and use this product, as incorrect use or use beyond the parameters and ways recommended in this manual have

the potential to cause damage to your audio system.

Please also note that many of the questions we receive at the technical support department are already answered in

this User Manual and in the online application notes on the miniDSP.com website. So please take the time to

carefully read this user manual and the online technical documentation. Thank you for your understanding!

WARRANTY TERMS

miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one year

from the invoice date. Our warranty does not cover failure of the product due to incorrect connection or installation,

improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any way, or any

usage outside of that recommended in this manual. If in doubt, contact miniDSP prior to use.

FCC CLASS BSTATEMENT

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

•This device may not cause harmful interference.

•This device must accept any interference received, including interference that may cause undesired operation.

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 5

Warning: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant

to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection. This equipment generates,

uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may

cause interference to radio communications. However, there is no guarantee that interference will not occur in a

particular installation. If this equipment does cause harmful interference to radio or television reception, which can

be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one

or more of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

Notice: Shielded interface cable must be used in order to comply with emission limits.

Notice: Changes or modification not expressly approved by the party responsible for compliance could void the

user’s authority to operate the equipment.

CE MARK STATEMENT

The USBSTREAMER has passed the test performed according to European Standard EN 55022 Class B.

ANOTE ON THIS MANUAL

This User Manual is designed for reading in both print and on the computer. If printing the manual, please print

double-sided. The embedded page size is 8 ½” x 11”. Printing on A4 paper will result in a slightly reduced size.

For reading on the computer, we have included hyperlinked cross-references throughout the manual. In addition, a

table of contents is embedded in the PDF file. Displaying this table of contents will make navigation much easier:

•In Adobe Reader on Windows, click on the “bookmarks” icon at the left. The table of contents will appear on the

left and can be unfolded at each level by clicking on the “+” icons.

•In Preview on the Mac, click on the View menu and select Table of Contents. The table of contents will appear on

the left and can be unfolded at each level by clicking on the triangle icons.

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 6

1PRODUCT OVERVIEW

Thank you for purchasing a miniDSP USBStreamer USB audio interface. The USBStreamer comes in two versions.

The box version can be used in two modes by loading different firmware:

•Eight channels of input/output via ADAT (optical). This is the default when the USBStreamer B box version is

shipped from miniDSP.

•Two channels (stereo) input/output via TOSLINK (optical).

The kit version can be used in several modes by loading different firmware:

•Eight channels of I2S via header pins plus two channels via TOSLINK (optical). This is the default when the

USBStreamer kit board is shipped from miniDSP.

•Eight channels of input/output via ADAT (optical).

•Two channels (stereo) input/output via TOSLINK (optical).

•Eight channels of I2S via header pins, with support for sample rates as low as 8 kHz.

•TDM input and output up to 96 kHz, 8 or 16 channels.

Typical applications for the USBStreamer include hi-fi systems and recording studios. The kit version can be built into

multichannel DACs, ADCs and digital audio interfaces, with connection to the USBStreamer via the I2S headers.

Most firmware versions include files with two different IDs. If two USBStreamers are to be connected to the same

computer, make sure that each has firmware with a different ID.

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2CONNECTIVITY

2.1 USB

Connect as shown for either box or kit version. The USB port provides power and computer connectivity.

2.2 OPTICAL

The optical ports support TOSLINK or ADAT, depending on the firmware loaded.

2.3 EXTERNAL POWER (KIT VERSION)

External 5V DC power can be connected to the USBStreamer via pin 12 of J2. This pin is connected with a “diode-or”

connection to the power line from the USB port. Supplying 5V DC to this pin will therefore ensure that the

USBStreamer remains powered on even when no USB device is connected. The USBStreamer consumes about 200

mA from this pin.

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 8

2.4 LOGIC-LEVEL I/O (KIT VERSION)

2.4.1 Overview

In addition to the optical interface, the USBStreamer provides additional data formats as logic-level signals:

•I2S, or Inter-IC Sound, is used to carry PCM digital audio between digital chips (ICs) and circuit boards. The

USBStreamer circuit board provides up to 8 channels of I2S input and 8 channels of I2S output.

•TDM, or Time domain multiplexing, is a format used by some ADC and DAC chips to carry multiple channels on a

single data line. This can reduce layout complexity and/or allow a greater number of channels.

Please note that logic-level connectivity is intended for professional engineers or advanced DIY users only. You will

need the knowledge to understand digital clocking and wiring and have access to the equipment necessary to be

able to debug any issues you may run into. (While miniDSP always tries to help its customers, it is infeasible for us to

debug your circuit and wiring for you.)

Be sure to take the following precautions when designing your I2S interface and wiring:

General I2S usage notes

•Unbuffered I2S lines must be kept short to ensure clock and data integrity.

•If driving longer lines, buffers may be required for the clock signals (MCLK, LRCLK, and BLCK).

•Observe correct grounding and shielding, and keep analog and digital grounds separated.

•Ensure that the clock frequencies and ratios as listed on later pages are compatible with connected circuits.

Clock master

The USBStreamer always operates as clock master –that is, the clock lines are always outputs. The connected

circuitry must therefore use the clocks provided by the USBStreamer.

3.3V logic level

All lines use a 3.3V logic level. Ensure that connected circuits use a compatible level (1.8V, for example, will not

work).

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 9

2.4.2 Headers and pinouts

The USBStreamer circuit board has two 12-pin headers located between the optical ports. Logic-level data and

clocks are on J1, while J2 carries auxiliary signaling and GPIO lines reserved for future enhancement.

Table 1 lists the default pinouts. Note that these vary with the specific firmware loaded. See Section 3 for full details.

Note that all I2S lines are 3.3V logic levels. Connected circuits must use a compatible logic level.

Table 1. Sample pinouts (See Section 3 for details)

J1 (I2S mode)

Description

I2S data OUT Ch 1&2

Ground (GND)

I2S data IN Ch 1&2

I2S data OUT Ch 3&4

Ground (GND)

I2S data IN Ch 3&4

I2S data OUT Ch 5&6

I2S data IN Ch 5&6

GPIO (future)

I2S data OUT Ch 7&8

GPIO (future)

I2S data IN Ch 7&8

RST (negative low)

Master clock (MCLK OUT)

GPIO (future)

Bit clock out (BCLK)

GPIO (future)

Ground (GND)

I2S frame sync (LRCLK)

5V external power

Figure 1. USBStreamer board layout

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 10

2.4.3 I2S

2.4.3.1 Clocks

I2S has three clock lines. These clocks are always outputs. The connected circuitry must therefore be set to run in

slave mode and accept its clocks from the USBStreamer.

MCLK The master clock for both playback and recording. This pin is always an output. Connected circuitry

can choose whether or not to use it.

LRCLK The frame synchronization clock, also known as the word clock. This clock is equal to the sampling

frequency (Fs) of the audio signal. This pin is always an output.

BCLK The bit clock (also known as shift clock or system clock). This is always equal to 64 x Fs. This pin is

always an output.

Table 2 summarizes the relation between the clocks. Be sure to double-check that connected circuitry will accept the

clocks at the frequencies and ratios listed.

Table 2. I2S clocks

Sample rate (LRCLK)

Master clock (MCLK)

Bit clock (BCLK)

MCLK/LRCLK

BCLK/LRCLK

8 kHz

24.576 MHz

512 kHz

3072

11.025 kHz

22.5792 MHz

705.6 kHz

2048

12 kHz

24.576 MHz

768 kHz

2048

16 kHz

24.576 MHz

1024 kHz

1536

32 kHz

24.576 MHz

2.048 MHz

768

44.1 kHz

22.5792 MHz

2.822 MHz

512

48 kHz

24.576 MHz

3.072 MHz

512

88.2 kHz

22.5792 MHz

5.6448 MHz

256

96 kHz

24.576 MHz

6.144 MHz

256

176.4 kHz

22.5792 MHz

11.2896 MHz

128

192 kHz

24.576 MHz

12.288 MHz

128

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