dac-aes - nevion
TRANSCRIPT
Nevion Europe P.O. Box 1020, 3204 Sandefjord, Norway – Tel: +47 33 48 99 99 – Fax: +47 33 48 99 98
www.nevion.com
DAC-AES
DAC-AES Audio Converter
User manual
Rev. 7
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Nevion Support
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: [email protected]
See http://www.nevion.com/support/ for service hours for customer support globally.
Revision history
Current revision of this document is the uppermost in the table below.
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
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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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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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2 Block diagram
Figure 1
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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. Non-audio 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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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 000 100 010 110 001 101 011 111
dBu +12 +15 +18 +17.6 +20 +21.4 +23 +23.9
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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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
1 |(THD+N of –60 dB FS signal)| + 60
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Intermodulation distortion2 @ - 12 dB FS Max. –102 dB
Typ. –104 dB
Crosstalk Max. –100 dB
Typ. –110 dB
2 SMPTE 4:1 60 Hz + 7 kHz
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6 Connector module
6.1 ADC-AES-C1
6.2 ADC-AES-C2
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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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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
Figure 3
7.2 C1 digital signals
Figure 4
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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.
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
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General environmental requirements for Nevion equipment
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)
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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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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.
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.
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.
Nevion Europe P.O. Box 1020, 3204 Sandefjord, Norway – Tel: +47 33 48 99 99 – Fax: +47 33 48 99 98
www.nevion.com
EC Declaration of Conformity
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 RoHS
3
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 Administration on the Control of Pollution Caused by Electronic Information Products