User's Guide ADI-648 Multichannel Audio Digital Interface SyncAlign TM TM SyncCheck Intelligent Clock Control TM TM SteadyClock Hi-Precision 24 Bit / 192 kHz 64 Channel MADI / ADAT Converter 16 x 16 Matrix Router MIDI embedded in MADI MADI 24 Bit Interface Firmware 2.
Important Safety Instructions ...........................................................................3 1 2 3 4 Introduction ........................................................................................................5 Package Contents ..............................................................................................5 Brief Description and Characteristics..............................................................5 Technical Specifications 4.1 Inputs............................
Important Safety Instructions ATTENTION! Do not open chassis – risk of electric shock The unit has non-isolated live parts inside. No user serviceable parts inside. Refer service to qualified service personnel. Mains • The device must be earthed – never use it without proper grounding • Do not use defective power cords • Operation of the device is limited to the manual • Use same type of fuse only To reduce the risk of fire or electric shock do not expose this device to rain or moisture.
User's Guide ADI-648 © RME
1. Introduction With the ADI-648 you have an incredibly versatile digital interface to your supply. What at first looks like a simple MADI to ADAT format converter, turns out to be an extremely flexible problem solver at a closer look. From small project studios to broadcast and television, this Advanced Digital Interface is the perfect tool for many tasks. As a consequent continuation of RME's world-wide successful ADI-8 series, the 648 also contains elaborate technology and the latest integrated circuits.
4. Technical Specifications • • • • • • • Power supply: Internal switching PSU, 100 - 240 V AC, 20 Watt Typical power consumption: 9 Watt Dimensions including rack ears (WxHxD): 483 x 44 x 242 mm (19" x 1.73" x 9.5") Dimensions without rack ears/handles (WxHxD): 436 x 44 x 235 mm (17.2" x 1.73" x 9.3") Weight: 2 kg ( 4.4 lbs) Temperature range: +5° up to +50° Celsius (41° F up to 122°F) Relative humidity: < 75%, non condensing 4.
MIDI • 16 channels MIDI • 5-pin DIN jack • Optocoupled, ground-free input • Invisible transmission via User bit of channel 56 (up to 48 kHz) • Invisible transmission via User bit of channel 28 (96k Frame) 4.2 Outputs MADI • Coaxial via BNC, 75 Ohm, according to AES10-1991 • Output voltage 600 mVpp • Cable length: up to 100 m • Optical via FDDI duplex SC connector • 62.
5. First Usage 5.1 Quick Start The user interface of the ADI-648 is characterized by a clearly structured architecture and an unambiguous labelling of the front and rear sides. The device can thus be used easily without a manual, because numerous LEDs show the state of the device and of all incoming and outgoing signals in a strictly logical way. However, we don't want to hold you back from reading this manual, as it includes a lot of important and useful information.
5.3 Operating the ADI-648 Join us for a small 'tour de ADI', starting on the left side at the MADI to ADAT Converter. Configuration starts with choosing the input, BNC or optical. The state of the input signal is displayed by 14 LEDs. Shown are active input, automatic input selection, receiver state, Sync, 56 or 64 channel format, 48k Frame or 96k Frame, and audio data within 8-channel groups.
6. The MADI to ADAT Converter 6.1 General This part of the ADI-648 converts MADI to ADAT optical. MADI offers 64 channels of 24 bit audio at up to 48 kHz sample rate, 32 channels at up to 96 kHz, or 16 channels at up to 192 kHz. Transmission happens over a single line, either coaxial (BNC) or fiber optic (network). In both cases the cable length can be more than 100 meters. The 64 MADI channels are transferred to 8 ADAT optical outputs (TOSLINK).
6.4 Outputs ADAT Optical The ADI-648 provides 8 outputs in ADAT optical format. They are fully compatible to all ADAT optical inputs. A usual TOSLINK cable is sufficient for connection.
7. The ADAT to MADI Converter 7.1 General This part of the ADI-648 converts ADAT optical to MADI. ADAT optical carries 8 channels of 24 bit audio at up to 48 kHz sample rate, 4 channels at up to 96 kHz, and 2 channels at up to 192 kHz. Transmission is done via a single optical line (TOSLINK). The length of the optical cable is limited to about 10 m. Because the Sample Split (S/MUX, S/MUX4) format doesn't contain a coding, the ADI-648 cannot distinguish it from normal (44.1/48 kHz) material.
7.4 Outputs MADI At the rear side of the ADI-648 there are two MADI outputs. The BNC output is built according to AES10-1991. The output's impedance is 75 Ohms. The output voltage will be 600 mVpp when terminated with 75 Ohms. The optical output uses a FDDI (ISO/IEC 9413-3) compatible optical module, according to AES10-1991. More information can be found in chapter 11.2, MADI Basics.
INT. For INTERNAL, 44.1 kHz or 48 kHz sampling rate is available. Note: the key 96k FRAME does only affect the format of the MADI output, not channel distribution or sample rate of the ADAT outputs. For the INTERNAL clock setting it is mandatory that the clock rate of the sources is synchronous to the ADI-648. Therefore the external device has to be synchronized to the ADI648's word clock out or ADAT/MADI out. The ADI-648 thus has to be master, all devices connected to it slave.
8.3 Word Clock Input and Output SteadyClock guarantees an excellent performance in all clock modes. Its highly efficient jitter suppression refreshes and cleans up any clock signal, and provides it as reference clock at the BNC output (see section 12.4). Input The ADI-648's transformer isolated word clock input is active when EXT is chosen in the clock section. The signal at the BNC input can be single or double speed, the ADI-648 automatically adapts to it.
9. Word Clock 9.1 Operation and Technical Background In the analog domain one can connect any device to another device, a synchronization is not necessary. Digital audio is different. It uses a clock, the sample frequency. The signal can only be processed and transmitted when all participating devices share the same clock. If not, the signal will suffer from wrong samples, distortion, crackle sounds and drop outs.
9.2 Cabling and Termination Word clock signals are usually distributed in the form of a network, split with BNC T-adapters and terminated with resistors. We recommend using off-the-shelf BNC cables to connect all devices, as this type of cable is used for most computer networks. You will find all the necessary components (T-adapters, terminators, cables) in most electronics and/or computer stores. The latter usually carries 50 Ohm components.
10. MIDI 10.1 MIDI Transmission MADI allows for a transmission of 64 audio channels over long distances with a single line – perfect. But what about MIDI? Be it remote control commands or sequencer data, in practice only a single MADI line will not suffice. Therefore the ADI-648 also has a MIDI I/O port. The data at the MIDI input are being included into the MADI signal invisibly, and can be collected at the MIDI output of another ADI-648, or a Hammerfall DSP MADI, at the other end of the MADI line.
10.3 Remote Control Software The Windows and Mac software MIDI Remote can be downloaded for free from the RME website. It can use any existing MIDI port within the system to perform remote control and status requests of all ADI-648 via a simple mouse click. Most appealing is the combination with a HDSP MADI (PCI card), offering a direct control of the ADI-648 via MADI. The remote control software then uses a virtual MIDI port of the card (port 3), which directly sends and receives MIDI data via MADI.
Software MIDI Remote in matrix view mode Brief description of Windows Software ADI-648 MIDI Remote File – Save Setup All settings can be stored in a file, and reloaded at any time. This is especially useful to quickly load different routings, or to access different ADI-648 with different IDs. Options – Start/Stop MIDI I/O Start / Stop of the MIDI communication. The current state is displayed in the title bar, showing chosen ID, online / no response / offline.
11. Special Modes 11.1 MADI to MADI Converter MADI has been used for quite some time now and therefore not all interfaces from different manufacturers are compatible with each other. An AMS Neve Logic DFC e. g. only accepts the 56 channel input format and when a 64 channel signal is applied, the whole input is muted. There exist lots of other but similar examples. The ADI-648 can serve here as a perfect link, because its MADI input can read any input format.
Example 1: A mixing desk sends 48 channels via MADI. 16 more channels from two RME OctaMic-D (8-channel microphone preamps with ADAT output) shall be recorded by a HDSP MADI into a computer. This application requires only one ADI-648, which has to be inserted into the MADI line. The Routing Matrix is used to loop channels 1 to 48 from MADI input to MADI output (groups 1 to 6).
12. Technical Background 12.1 DS - Double Speed When activating the 96k FRAME, the MADI output of the ADI-648 operates at double sample rate. The internal clock 44.1 kHz turns to 88.2 kHz, 48 kHz to 96 kHz. The internal resolution is still 24 bit. Sample rates above 48 kHz were not always taken for granted, and are still not widely used because of the CD format (44.1 kHz) dominating everything. Before 1998 there were no receiver/transmitter circuits available that could receive or transmit more than 48 kHz.
12.3 MADI Basics MADI, the serial Multichannel Audio Digital Interface, has been defined already in 1989 as an extension of the existing AES3 standard following several manufacturers' wish. The format also known as AES/EBU, a balanced bi-phase signal, is limited to two channels. Simply put, MADI contains 28 of those AES/EBU signals in serial, i. e. after one another, and the sample rate can still even vary by +/-12.5%. The limit which cannot be exceeded is a data rate of 100Mbit/s.
12.4 SteadyClock The SteadyClock technology of the ADI-648 guarantees an excellent performance in all clock modes. Its highly efficient jitter suppression refreshes and cleans up any clock signal, and provides it as reference clock at the word clock output. Usually a clock section consists of an analog PLL for external synchronization and several quartz oscillators for internal synchronisation. SteadyClock requires only one quartz, using a frequency not equalling digital audio.
13. Controls and Connectors Front Left Part Signal source BNC Optisch Status display Error Sync Audio Status display Input Sync Audio Status MADI Output 96k Frame DS word clock Front Right Part Matrix Router Clock Section Clock Source ADAT MADI Internal Clock 44.1 / 48 kHz 96k Frame 88.
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15. MIDI Implementation Chart ADI-648 15.1 Basic SysEx Format Value Name F0h 00h 20h 0Dh 64h 00h..7Eh, 7Fh mm nn oo F7h SysEx header MIDITEMP manufacturer ID Model ID (ADI-648) Device ID. 7Fh = broadcast (all IDs) Message type Parameter number (see table 1) Data byte EOX 15.2 Message Types Value Name 10h 20h 30h Request value Set value Value response Request Value Format: F0 00 20 0D 64 (dev ID) 10 F7 This string triggers a complete dump of all value response data bytes.
Table 1 Request Value Set Value Value Response 00h MADI input select x x x 1 Byte, 0 = BNC, 1 = optical 01h MADI input state x x 1 Byte, 0 = normal operation, 1 = Redundancy mode 02h MADI sync state x x 1 Byte, 0 = error, 1 = lock, 2 = sync 03h MADI audio state x x 1 Byte, see table 2 04h MADI audio state x x 1 Byte, see table 2 x x 1 Byte, bit 0: 0 = 56ch / 1 = 64ch, bit 1: 0 = 48k frame, 1 = 96k frame 06h WCK input state x x 1 Byte, 0 = no lock, 1 = lock 10h ADAT in 1 and 2
Table 2 1st Byte bit 0 input 1 audio indication 1st Byte bit 1 input 2 audio indication 1st Byte bit 2 input 3 audio indication 1st Byte bit 3 input 4 audio indication 2nd Byte bit 0 input 5 audio indication 2nd Byte bit 1 input 6 audio indication 2nd Byte bit 2 input 7 audio indication 2nd Byte bit 3 input 8 audio indication Table 3 bits 0..2 ADAT in 1 / 3 / 5 / 7, 0 = error, 1 = lock, 2 = sync bits 4..
16. Warranty Each individual ADI-648 undergoes comprehensive quality control and a complete test at IMM before shipping. The usage of high grade components allows us to offer a full two year warranty. We accept a copy of the sales receipt as valid warranty legitimation. If you suspect that your product is faulty, please contact your local retailer.
CE / FCC Compliance CE This device has been tested and found to comply with the limits of the European Council Directive on the approximation of the laws of the member states relating to electromagnetic compatibility according to RL2004/108/EG, and European Low Voltage Directive RL2006/95/EG. FCC 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.
