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DAC-AES
DAC-AES Audio Converter
User manual
Rev. 7
P.O. Box 1020, 3204 Sandefjord, Norway – Tel: +47 33 48 99 99 – Fax: +47 33 48 99 98
Nevion Europe
www.nevion.com
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DAC-AES Rev. 7
Nevion Europe
P.O. Box 1020
3204 Sandefjord, Norway
Support phone 1: +47 33 48 99 97
Support phone 2: +47 90 60 99 99
Nevion USA
1600 Emerson Avenue
Oxnard, CA 93033, USA
Toll free North America: (866) 515-0811
Outside North America: +1 (805) 247-8560
E-mail: support@nevion.com
See http://www.nevion.com/support/ for service hours for customer support globally.
Rev.
Repl.
Date
Sign
Change description
7 6 2011-06-23
AJM
Clarified supported bits in AES.
6 5 2010-08-09
AA
New template. Corrected drawings in Chapter 6.1
and 6.2.
Updated Materials Declaration and Recycling
information, and Declaration of Conformity.
5 4 2007-10-25
New front page and removed old logo.
4 3 2007-09-10
Added Materials Declaration and EFUP; updated EC
Declaration of Conformity.
3 2 2004-02-10
C2 backplane descriptions.
2 1 2002-11-21
Typos
1 A 2002-09-19
Manual for first production batch
A - 2002-09-03
Preliminary version
Nevion Support
Revision history
Current revision of this document is the uppermost in the table below.
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DAC-AES Rev. 7
Contents
1 General description ................................................................................................. 4
2 Block diagram .......................................................................................................... 5
3 Technical description ............................................................................................... 6
4 Configuration ........................................................................................................... 7
4.1 Analogue output levels .................................................................................................... 7
5 Specifications .......................................................................................................... 8
5.1 Measurement conditions.................................................................................................. 8
5.2 Digital Inputs .................................................................................................................... 8
5.3 Analogue outputs ............................................................................................................ 8
6 Connector module ................................................................................................. 10
6.1 ADC-AES-C1 ..................................................................................................................10
6.2 ADC-AES-C2 ..................................................................................................................10
6.3 Mounting the connector module ......................................................................................11
7 Connector pin drawings ......................................................................................... 12
7.1 Analogue signals ................................................................................................ ............12
7.2 C1 digital signals ............................................................................................................12
8 Module status ........................................................................................................ 13
8.1 LED’s – light emitting diodes ..........................................................................................13
General environmental requirements for Nevion equipment..................................... 14
Product Warranty ...................................................................................................... 15
Appendix A Materials declaration and recycling information..................................... 16
EC Declaration of Conformity ................................................................................... 17
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DAC-AES Rev. 7
1 General description
The DAC-AES card is a reference quality audio D/A converter. It is one of the Flashlink
series of modules. It will convert two AES3 (or AES-3id) stereo digital audio signals into four
analogue audio channels with the highest possible quality. Dual analogue outputs for each
converter are available on the backplane connector. The card may be used with nominal or
double sampling rates.
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DAC-AES Rev. 7
2 Block diagram
Figure 1
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DAC-AES Rev. 7
3 Technical description
The DAC-AES card was designed as a reference audio converter with a highly audio
optimized signal path. Careful design of the output circuitry was needed to maintain a high
dynamic range whilst minimizing distortion. Jitter of the sampling clock is kept to a minimum
by the use of a digital receiver with a large degree of hysteresis. The clock recovery scheme
allows the sample clock to vary with a few PPM between an upper and lower limit.
The two D/A converters are totally independent and may be used with completely different
input signals.
The AES receiver circuit signals the most important information about the received signal to
the microcontroller, which sets up the appropriate parameters in the D/A converter. Nonaudio and pre-emphasis are interpreted and used by the converter.
The output of the D/A converter feeds a differential second-order filter. This solution
suppresses high frequency noise and the turn- on and off transients. The choice of op-amp is
quite important in order to achieve a low output noise. The signal is then AC coupled to a
non-inverting variable gain stage with gains ranging from 0 dB to 18 dB. The gain variation is
performed by switching extra resistors in parallel to ground from the inverting input. The
output is inverted with an inverting stage and the output stage is fed differentially.
The output circuit is a electronic differential amplifier with output level compensation. If either
of the output phases is connected to 0V, the level of the other phase will increase to maintain
the output differential signal level. Each converter has dual independent analogue outputs.
The card has a microcontroller that sets up the parameters of the D/A converters and
controls the LEDs on the front of the card. It also monitors the 12V voltage level generated
on the card and the 5V power voltage and reports to the Multicon Gyda controller when
present.
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DAC-AES Rev. 7
Switches
000
100
010
110
001
101
011
111
dBu
+12
+15
+18
+17.6
+20
+21.4
+23
+23.9
4 Configuration
4.1 Analogue output levels
The DAC-AES has two eight-way miniature DIP switches located near the middle of the card.
Switches 1-4 and 5-8 control the output signal levels for the left and right channels
respectively. Switches on SW1 control the levels for converter 1 while switches on SW2
control the levels for converter 2. The picture below shows the converter configured to
produce an output level of +12 dBu with a digital input level of 0 dBFS (Full scale).
Figure 2
The settings for the level switches are presented in the following table.
0 corresponds to off. 1 corresponds to on.
The three numbers in the top row should be read as: SW1, SW2, SW3 or SW6,SW7,SW8.
Switches 4 and 5 connect a trimpot into the gain circuit, which may be used to set a
customer defined output level.
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DAC-AES Rev. 7
1
5 Specifications
5.1 Measurement conditions
Unless otherwise stated:
Sampling rate 48 kHz
Ambient temperature 25 C
Measurement bandwidth 20 Hz – 20 kHz
Detector RMS
0 dBFS output level 0 dBFS = 20 dBu
5.2 Digital Inputs
Number of inputs 2
Sampling rates 32- 54 kHz and 88.2 - 108 kHz
Audio bits 20 and 24 bits
Intrinsic jitter 200 ps peak-peak
5.2.1 ADC-AES-C1
Connector D-sub 15 pin female.
Format AES3-1992
Input impedance 110
5.2.2 ADC-AES-C2
Connector BNC
Format AES-3id
Input impedance 75
5.3 Analogue outputs
Number of outputs 8 electronically balanced
Connector D-sub 25 pin female.
Common mode voltage tolerance 15 V
Output impedance (differential) 47
Frequency response 10 Hz – 21.5 kHz +0 dB -0.1 dB
Passband ripple 0.0002 dB
Group delay 44 samples
Stopband attenuation 110 dB
Dynamic range1 Min. 115 dB(A) (0 dBFS @ +12 dBu)
Typ. 120 dB(A)
THD+N @ -1 dBFS Max. –95 dB
Typ. –102 dB
|(THD+N of –60 dB FS signal)| + 60
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DAC-AES Rev. 7
2
Intermodulation distortion2 @ - 12 dB FS Max. –102 dB
Typ. –104 dB
Crosstalk Max. –100 dB
Typ. –110 dB
SMPTE 4:1 60 Hz + 7 kHz
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DAC-AES Rev. 7
6 Connector module
6.1 ADC-AES-C1
6.2 ADC-AES-C2
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DAC-AES Rev. 7
6.3 Mounting the connector module
Usually the module is purchased pre-mounted in a frame. The details of how the connector
module is mounted, is found in the user manual for the sub-rack frame FR-2RU-10-2.
This manual is also available from our web site: http://www.nevion.com/
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DAC-AES Rev. 7
7 Connector pin drawings
The pin connections in the D-sub connectors are shown on the following pages. The 25 pin
connector follows the Tascam DA-88 standard for balanced audio pairs while the 15 pin
connector follows a similar pattern.
7.1 Analogue signals
7.2 C1 digital signals
Figure 3
Figure 4
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DAC-AES Rev. 7
Diode \ state
Red LED
Green LED
Orange
Status
Module is faulty:
Replace
Module is OK
Module power is OK
Card has not been
programmed
D/A converter 1
Input status
Loss of sync. signal
No electrical input
signal.
48 kHz Input signal
present
Other Input signal
present
D/A converter 2
Input status
Loss of sync. signal
No electrical input
signal.
48 kHz Input signal
present
Other Input signal
present
Audio mode
NA
Normal
Non audio signal
present
8 Module status
The status of the module can be monitored in two ways.
1. Multicon Gyda, the system controller card.
2. LEDs at the front of the sub-rack.
The LEDs are mounted on the module itself, whereas Multicon Gyda is a separate module
giving detailed information of the status of the card. The functions of the LED's are described
in the next section. Multicon Gyda is described in a separate user manual.
8.1 LED’s – light emitting diodes
The status of the module can be easily monitored visually by the LEDs at the front of the
module. The LEDs are visible through the front panel as shown below.
The DAC-AES has 4 LEDs each showing a status. The position of the different LEDs is
shown above.
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DAC-AES Rev. 7
1.
The equipment will meet the guaranteed performance specification under the following
environmental conditions:
-
Operating room temperature range:
0°C to 50°C
-
Operating relative humidity range:
<90% (non-condensing)
2.
The equipment will operate without damage under the following environmental
conditions:
-
Temperature range:
-10°C to 55°C
-
Relative humidity range:
<95% (non-condensing)
General environmental requirements for Nevion equipment
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DAC-AES Rev. 7
Product Warranty
The warranty terms and conditions for the product(s) covered by this manual follow the
General Sales Conditions by Nevion, which are available on the company web site:
www.nevion.com
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DAC-AES Rev. 7
組成名稱
Part Name
Toxic or hazardous substances and elements
鉛
Lead
(Pb)
汞
Mercury
(Hg)
镉
Cadmium
(Cd)
六价铬
Hexavalent
Chromium
(Cr(VI))
多溴联苯
Polybrominated
biphenyls
(PBB)
多溴二苯醚
Polybrominated
diphenyl ethers
(PBDE)
DAC-AES
O O O O O
O
O: Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for
this part is below the limit requirement in SJ/T11363-2006.
X: Indicates that this toxic or hazardous substance contained in at least one of the homogeneous
materials used for this part is above the limit requirement in SJ/T11363-2006.
Appendix A Materials declaration and recycling information
A.1 Materials declaration
For product sold into China after 1st March 2007, we comply with the “Administrative
Measure on the Control of Pollution by Electronic Information Products”. In the first stage of
this legislation, content of six hazardous materials has to be declared. The table below
shows the required information.
This is indicated by the product marking:
A.2 Recycling information
Nevion provides assistance to customers and recyclers through our web site
http://www.nevion.com/. Please contact Nevion’s Customer Support for assistance with
recycling if this site does not show the information you require.
Where it is not possible to return the product to Nevion or its agents for recycling, the
following general information may be of assistance:
Before attempting disassembly, ensure the product is completely disconnected from
power and signal connections.
All major parts are marked or labeled to show their material content.
Depending on the date of manufacture, this product may contain lead in solder.
Some circuit boards may contain battery-backed memory devices.
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MANUFACTURER
Nevion Europe AS
P.O. Box 1020, 3204 Sandefjord, Norway
AUTHORIZED REPRESENTATIVE
(Established within the EEA)
Not applicable
MODEL NUMBER(S)
DAC-AES
DESCRIPTION
Audio Converter card
DIRECTIVES this equipment complies with
Low voltage (EU Directive 2006/95/EC)
EMC (EU Directive 2004/108/EC)
RoHS (EU Directive 2002/95/EC)
China RoHS3
WEEE (EU Directive 2002/96/EC)
REACH
HARMONISED STANDARDS applied in order
to verify compliance with Directive(s)
EN 55103-1:1996
EN 55103-2:1996
EN 61000-6-2:2001
TEST REPORTS ISSUED BY
Notified/Competent Body
Report no:
Nemko
10689
TECHNICAL CONSTRUCTION FILE NO
Not applicable
YEAR WHICH THE CE-MARK WAS AFFIXED
2004
TEST AUTHORIZED SIGNATORY
MANUFACTURER
AUTHORIZED
REPRESENTATIVE
(Established within EEA)
Date of Issue
2007-09-10
Place of Issue
Not applicable
Sandefjord, Norway
Name
Thomas Øhrbom
Position
QA Director, Nevion Europe
(authorized signature)
3
EC Declaration of Conformity
Administration on the Control of Pollution Caused by Electronic Information Products
P.O. Box 1020, 3204 Sandefjord, Norway – Tel: +47 33 48 99 99 – Fax: +47 33 48 99 98
Nevion Europe
www.nevion.com
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