DAC-AES. DAC-AES Audio Converter. User manual. Rev. 7

Transcription

1 DAC-AES DAC-AES Audio Converter User manual Rev. 7 Nevion Europe P.O. Box 1020, 3204 Sandefjord, Norway Tel: Fax:

2 Nevion Support Nevion Europe P.O. Box Sandefjord, Norway Support phone 1: Support phone 2: Nevion USA 1600 Emerson Avenue Oxnard, CA 93033, USA Toll free North America: (866) Outside North America: +1 (805) See 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 AJM Clarified supported bits in AES AA New template. Corrected drawings in Chapter 6.1 and 6.2. Updated Materials Declaration and Recycling information, and Declaration of Conformity New front page and removed old logo Added Materials Declaration and EFUP; updated EC Declaration of Conformity C2 backplane descriptions Typos 1 A Manual for first production batch A Preliminary version nevion.com 2

3 Contents 1 General description Block diagram Technical description Configuration Analogue output levels Specifications Measurement conditions Digital Inputs Analogue outputs Connector module ADC-AES-C ADC-AES-C Mounting the connector module Connector pin drawings Analogue signals C1 digital signals Module status LED s light emitting diodes...13 General environmental requirements for Nevion equipment Product Warranty Appendix A Materials declaration and recycling information EC Declaration of Conformity nevion.com 3

4 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. nevion.com 4

5 2 Block diagram Figure 1 nevion.com 5

6 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. nevion.com 6

7 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 dbu Switches 4 and 5 connect a trimpot into the gain circuit, which may be used to set a customer defined output level. nevion.com 7

8 5 Specifications 5.1 Measurement conditions Unless otherwise stated: Sampling rate Ambient temperature Measurement bandwidth Detector 48 khz 25 C 20 Hz 20 khz RMS 0 dbfs output level 0 dbfs = 20 dbu 5.2 Digital Inputs Number of inputs 2 Sampling rates Audio bits Intrinsic jitter ADC-AES-C1 Connector Format Input impedance ADC-AES-C2 Connector Format Input impedance khz and khz 20 and 24 bits 200 ps peak-peak D-sub 15 pin female. AES BNC AES-3id Analogue outputs Number of outputs Connector Common mode voltage tolerance Output impedance (differential) Frequency response Passband ripple Group delay Stopband attenuation Dynamic range 1 -1 dbfs 8 electronically balanced D-sub 25 pin female. 15 V Hz 21.5 khz +0 db -0.1 db db 44 samples 110 db Min. 115 db(a) (0 +12 dbu) Typ. 120 db(a) Max. 95 db Typ. 102 db 1 (THD+N of 60 db FS signal) + 60 nevion.com 8

9 Intermodulation distortion - 12 db FS Crosstalk Max. 102 db Typ. 104 db Max. 100 db Typ. 110 db 2 SMPTE 4:1 60 Hz + 7 khz nevion.com 9

10 6 Connector module 6.1 ADC-AES-C1 6.2 ADC-AES-C2 nevion.com 10

11 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 This manual is also available from our web site: nevion.com 11

12 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 nevion.com 12

13 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: Module is OK Card has not been Replace Module power is OK programmed D/A converter 1 Input status D/A converter 2 Input status Loss of sync. signal No electrical input signal. Loss of sync. signal No electrical input 48 khz Input signal present 48 khz Input signal present Other Input signal present Other Input signal present signal. Audio mode NA Normal Non audio signal present nevion.com 13

14 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) nevion.com 14

15 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: nevion.com 15

16 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. Toxic or hazardous substances and elements 組成名稱 Part Name 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/T 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/T This is indicated by the product marking: A.2 Recycling information Nevion provides assistance to customers and recyclers through our web site 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.com 16

17 EC Declaration of Conformity MANUFACTURER AUTHORIZED REPRESENTATIVE (Established within the EEA) MODEL NUMBER(S) DESCRIPTION DIRECTIVES this equipment complies with HARMONISED STANDARDS applied in order to verify compliance with Directive(s) Nevion Europe AS P.O. Box 1020, 3204 Sandefjord, Norway Not applicable DAC-AES Audio Converter card 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 EN :1996 EN :1996 EN :2001 TEST REPORTS ISSUED BY Notified/Competent Body Report no: TECHNICAL CONSTRUCTION FILE NO YEAR WHICH THE CE-MARK WAS AFFIXED 2004 TEST AUTHORIZED SIGNATORY MANUFACTURER Nemko Not applicable AUTHORIZED REPRESENTATIVE (Established within EEA) Not applicable Date of Issue Place of Issue Sandefjord, Norway Name Position Thomas Øhrbom QA Director, Nevion Europe (authorized signature) 3 Administration on the Control of Pollution Caused by Electronic Information Products Nevion Europe P.O. Box 1020, 3204 Sandefjord, Norway Tel: Fax: