Albalá Ingenieros AAC3008C01 User manual

AAC3008C01
QUAD ANALOG AUDIO TO AES/EBU DIGITAL AUDIO CONVERTER
Version 1.0
Albalá Ingenieros, S.A.
Medea, 4 - 28037 Madrid - Spain
23 June 2016 - © Albalá Ingenieros S.A. - All rights reserved

AAC3008C01

AAC3008C01
QUAD ANALOG AUDIO TO AES/EBU DIGITAL AUDIO CONVERTER
Version 1.0
1. DESCRIPTION ...................................................................................................................... 5
1.1. The AAC3008C01 ............................................................................................................................ 5
1.2. Features ............................................................................................................................................. 6
1.3. Block diagram .................................................................................................................................. 8
2. SPECIFICATIONS ................................................................................................................. 9
3. INSTALLATION .................................................................................................................. 11
3.1. Initial inspection .......................................................................................................................... 11
3.2. Safety instructions ...................................................................................................................... 11
3.3. Environmental considerations ................................................................................................ 12
3.4. Power considerations ................................................................................................................. 12
3.5. Module configuration ................................................................................................................ 12
3.6. Installing the module in the mounting frame ................................................................... 12
3.7. Interconnection ............................................................................................................................ 14
3.7.1. Digital audio connections ................................................................................................ 14
3.7.2. Analog audio connections ............................................................................................... 15
3.7.3. Analog video and word-clock connections ................................................................ 15
3.7.4. Delay signal connections .................................................................................................. 15
4. OPERATION ...................................................................................................................... 17
4.1. Front panel description .............................................................................................................. 17
4.2. Functional description ............................................................................................................... 18
4.2.1. Operation in 20 or 24 bits ................................................................................................ 18
4.2.2. Normal and Silence operation ........................................................................................ 19
4.2.3. Description of the delay line ........................................................................................... 19
4.2.4. Selection of the sampling frequency ........................................................................... 20
4.2.4.1. Automatic Mode operation .................................................................................... 20
4.2.4.2. Operation n Manual Mode ..................................................................................... 21
4.3. Description of the processing unit ........................................................................................ 21
4.4. Module remote control and supervision ............................................................................. 22
4.4.1. Details of the AAC3008C01 registers ........................................................................... 23
5. GLOSSARY ........................................................................................................................ 27
6. REGULATIONS .................................................................................................................. 29
7. VERSIONS ......................................................................................................................... 31

AAC3008C01

Albalá Ingenieros | Manual AAC3008C01
1. DESCRIPTION
1.1. The AAC3008C01
The AAC3008C01 module is a high-precision analog-to-digital converter for audio
signals. High SNR A/D converters and a direct digital synthesis (DDS) oscillator that
generate the various clocking signals guarantee very low jitter. The combination of high
quality A/D conversion and a diverse set of external frequency synchronization options
make this module an excellent choice for use in professional quality production
environments.
The AAC3008C01 provides eight analog audio inputs that are coded into four AES/EBU
digital audio data streams. The module implements an internal matrix such that each
digital output can be the sum of one or all of the inputs. Furthermore, each input signal
can be inverted in phase and gained up or down in the digital domain from +24 to
-39.5dB (mute) with a resolution of 0.5dB.
This AAC3008C01 module can be synchronized to three types of external signals: PAL
and NTSC video references (black-burst), audio sampling reference signals (word-clock)
and AES/EBU digital audio reference signals (AES11). If no reference is provided, the
module can operate using an internal reference and generating a sampling frequency
selectable from the following standard values: 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz
and 96kHz.
The module includes memory in order to delay the audio. Each digital stream (each audio
pair) can be configured for an independent delay. Using an external delay input, a
variable delay can be applied to each stream for applications that require
synchronization of audio and video.
The analog audio inputs are electronically balanced with full scale levels that are
adjustable between +14 and +24dBu. The status channel of the digital streams is coded
to indicate that the streams produced are professional quality at 20 or 24 bits.
The front panel of the module contains three classes of LEDs: those that indicate the
presence and lock to external references, those that indicate overloads at either the
analog inputs or the digital outputs and those that indicate the sampling frequency of
the A/D conversion.
The AAC3008C01 uses the following standard sampling frequencies commonly found in
production environments: 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz and 96kHz.
It is possible to monitor the AAC3008C01 status remotely using a communications
controller module installed in the same mounting frame. In addition, certain controller
modules provide SNMP management and the ability to record events in a file including
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Albalá Ingenieros | Manual AAC3008C01
date and time information for further analysis.
The AAC3008C01 is a TL3000 terminal line module and can be housed in a three rack
unit (3 RU) UR3000 mounting frame or a 1 RU UR3100 mounting frame.
1.2. Features
•High quality converter for transforming eight channels of analog audio into four
channels of AES/EBU digital audio.
• Balanced, high impedance analog audio inputs.
•The AES/EBU digital audio outputs are intended for use with shielded, twisted-pair
cable and are transformer isolated.
• Low jitter sampling clock.
• 24 bit delta-sigma conversion with 64x or 128x oversampling.
• Wide dynamic range.
•Generates the following common sampling frequencies: 32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96kHz.
•Provides a digital matrix that can combine the desired input signals into each output
channel.
•Accepts three different reference signal types: black burst, word-clock and AES/EBU
digital audio.
•The AES/EBU reference input is intended for use with shielded, twisted-pair cable and is
transformer isolated.
•Includes a TTL level delay input and a memory buffer that allows each channel to be
delayed by up to 16363 samples.
•Both the sampling frequency and the reference input can be selected manually or
automatically.
• Balanced, high impedance analog audio inputs.
•Front panel indicators for overload in the analog audio inputs, external sync presence
and locking and sampling frequency.
•Full scale level adjustment between +14 and +24dBu in 1dB steps using internal
jumpers.
•Module control and supervision can be done remotely when the mounting frame is
equipped with a communications controller module.
•One UR3000 mounting frame can house up to 12 AAC3008C01 modules. If power
supply redundancy is required and FA3000 or FA3001 modules are used then only 10
modules can be housed in the mounting frame. If PSU3300 or PSU3301 modules are
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Albalá Ingenieros | Manual AAC3008C01
used for this purpose then up to 12 modules can be installed.
• One UR3100 mounting frame can house up to three AAC3008C01 modules.
• Low power.
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Albalá Ingenieros | Manual AAC3008C01
1.3. Block diagram
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Albalá Ingenieros | Manual AAC3008C01
2. SPECIFICATIONS
Analog audio signal input
Connector Plug-in terminal,
3.81mm pitch
Impedance >24 kΩ
Type Active balanced
Number of inputs 4 stereo pairs
Common mode rejection ratio (CMRR):
at 50 Hz >75 dB
at 20 kHz >75 dB
Maximum common mode range ±12 V
Maximum input level 24 dBu
Analog to digital converter
Type Sigma-delta,
x128 oversampling (fs< 48kHz)
Type Sigma-delta,
x64 oversampling (fs> 64kHz)
Number of bits 24
Sampling rate:
Standard 32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96 kHz
Full scale level 14 to 24dBu, 1dB steps
3 dB cuttoff frequency:
Lower <20 Hz
Upper 0.49xfs
Noise:
Unweighted <- 107dBFS measured with a 1kHz, -
60dBFS tone
A-weighted <- 110 dBAFS measured with a 1kHz, -
60dBFS tone
Harmonic distortion plus noise (THD+N) <- 91dB measured with a
1kHz, - 1dBFS tone
AES/EBU digital audio signal output
Connector Plug-in terminal,
3.81mm pitch
Impedance 110Ω ± 20 %
Type Transformer balanced
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Albalá Ingenieros | Manual AAC3008C01
Encoding and electrical characteristics According to
EBU Tech. 3250-E/AES3
standard
Sampling rate 32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96 kHz
Number of outputs 4
Signal specifications with external reference:
Jitter <300 psRMS
Locking range ±40 ppm
Signal specifications without external reference:
Maximum frequency error ±25 ppm
Video delay input (TTL signal)
Connector BNC
Impedance 75 Ω
Threshold levels:
VIH min. 2.0 V
VIL max. 0.8 V
Black-burst reference signal input
Connector BNC
Return loss >30dB up to 5 MHz
Type Passive Loop-Through
Signal format According to ITU-R BT.470-6 standard
Accepted formats 625i50, 525i59.94
Input signal amplitude 300mVpp ± 6 dB
AES/EBU digital audio reference signal input
Connector Plug-in terminal,
3.81mm pitch
Impedance Loop-Through or 110Ω loaded
Type Transformer balanced
Encoding and electrical characteristics According to
EBU Tech. 3250-E/AES3
standard
Sampling rate 32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96 kHz
Word-clock reference signal input
Connector BNC
Type Passive Loop-Through
Sampling rate 32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96 kHz
Input level 2 - 5VPP
General
Maximum power supply current + 600 / - 600 mA
Operating temperature range 0 .. 50 °C
Approximate weight 350 g
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