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User's Guide ADI-648 © RME

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, and 32 channels at up to 96 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). Furthermore, the
ADI-648 contains an easy-configurable 8-channel 16x16

Matrix Router

. Any of the outputs,

which are divided into 8-channel blocks, can be fed from any 8-channel input block, both on the
ADAT and the MADI side. With this, there is not only free routing within the MADI to ADAT
conversion, but also splitting and routing within the same format.

6.2 Inputs

Both MADI inputs are located on the rear of the ADI-648.

The BNC input's ground-free design is built according to AES10-1991. The input's impedance is
75 Ohm. It will operate error-free from about 180 mVpp.

The optical input 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.

The ADI-648 includes automatic input selection. In case the current input signal fails, the unit
switches to the other input immediately. This mode, called redundancy mode, offers improved
safety against errors on the transmission line. Switching the inputs is done in about one second.
The ADI-648 displays redundancy operation by a blinking LED of the original input, while the
input LED of the currently active input will be lit constantly.

6.3 Input State Display

The state of the MADI input is displayed by different LEDs. The ERROR LED is directly cou-
pled with the MADI-Receiver, and informs the user reliably about the quality of the input signal.
The LED will light up red, as soon as there is any error, be it a carrier voltage which is too low,
invalid data or any other error which prevents the receiver from accepting the input signal.

If a valid input signal is applied, SyncCheck is active automatically. If the MADI input is not
chosen as clock source, SyncCheck takes the chosen clock (Internal, External, ADAT) as ref-
erence and compares it with the MADI input clock. In case no synchronous operation is de-
tected the SYNC LED will start blinking.

Audio data present in the input channels is signalled by an AUDIO LED. As the ADI-648 is
based on ADAT ports and therefore operates in 8-channel blocks, an AUDIO LED will show
audio data from 8 channels simultaneously. The green LED is lit as soon as one of the chan-
nels of an 8-channel block contains audio data, that is no longer digital zero.

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Содержание ADI-648

Страница 1: ...el Audio Digital Interface SyncAlign SyncCheck Intelligent Clock Control TM SteadyClock TM Hi Precision 24 Bit 96 kHz 64 Channel MADI ADAT Converter 16 x 16 Matrix Router MIDI embedded in MADI Firmware 1 5 or up MADI 24 Bit Interface ...

Страница 2: ...ction 8 1 Clock Configuration 11 8 2 Lock and SyncCheck 12 8 3 Word Clock Input and Output 13 9 Word Clock 9 1 Operation and Technical Background 14 9 2 Cabling and Termination 15 10 MIDI 10 1 Transmisson of MIDI 16 10 2 Remote Controlling the ADI 648 16 10 3 Remote Control Software 17 11 Special Modes 11 1 MADI to MADI Converter 18 11 2 ADAT Patchbay and Splitter 18 11 3 MADInet 18 12 Technical B...

Страница 3: ...lign Bitclock PLL SteadyClock active jitter damping per D PLL patchbay functionality and a 16x16 Matrix router All of the ADI 648 I Os support 96 kHz 24 bit As ADAT optical is restricted to 48kHz in DS mode Double Speed two channels are being used for the transmission of one channel s data The Sample Split algorithm used is compatible to S MUX and Double Wire and also imple mented in RME s Hammerf...

Страница 4: ... S MUX 8 x 4 channels 24 bit 96 kHz Bitclock PLL ensures perfect synchronisation even in varispeed operation Lock range 31 kHz 56 kHz Jitter when synced to input signal 2 ns Word Clock BNC not terminated 10 kOhm Automatic Double Speed detection and internal conversion to Single Speed PLL for low jitter synchronisation even in varispeed operation AC coupling not effected by DC offsets within the ne...

Страница 5: ...ndard 64 channels 24 bit up to 48 kHz Copy Mode up to 2 x 8 channels 24 bit 48 kHz Sample Split S MUX 8 x 4 channels 24 bit 96 kHz Word Clock BNC Max output voltage 5 Vpp Output voltage 75 Ohm 4 0 Vpp Impedance 10 Ohm Frequency range 27 kHz 56 kHz MIDI 16 channels MIDI 5 pin DIN jack 4 2 Digital Clocks Internal ADAT In MADI In Word Clock In Low jitter design 1 ns in PLL mode all inputs Internal cl...

Страница 6: ...ns The device is in slave mode and gets its reference clock directly out of the MADI input signal The Matrix Router is deactivated A quick guide for operation and functionality of the ADI 648 can be found on the next page For transmission of the digital signals into a computer with PCI bus we recommend RME s interface cards of the Hammerfall and Hammerfall DSP series especially the Hammerfall DSP ...

Страница 7: ...lligent clock control ICC offers extensive and professional means To start with the clock source can be set to Internal crystal External BNC word clock and Input while Input lets you select between ADAT and MADI The INT ernal clock rates are 44 1 and 48kHz Lock state is displayed by the state of the input LEDs flashing or constantly lit Normally all 64 MADI channels will be routed to the according...

Страница 8: ...nt input signal fails the unit switches to the other input immediately This mode called redundancy mode offers improved safety against errors on the transmission line Switching the inputs is done in about one second The ADI 648 displays redundancy operation by a blinking LED of the original input while the input LED of the currently active input will be lit constantly 6 3 Input State Display The s...

Страница 9: ...nverts Double Speed data to Sample Split S MUX The data of one MADI channel will be processed and routed to two ADAT channels according to the following table MADI In 1 2 3 4 5 6 7 8 DS Signal Port 1 2 1 3 4 1 5 6 1 7 8 1 1 2 2 3 4 2 5 6 2 7 8 2 MADI In 9 10 11 12 13 14 15 16 DS Signal Port 1 2 3 3 4 3 5 6 3 7 8 3 1 2 4 3 4 4 5 6 4 7 8 4 MADI In 17 18 19 20 21 22 23 24 DS Signal Port 1 2 5 3 4 5 5...

Страница 10: ...cal inputs of the ADI 648 are fully compatible with all ADAT optical outputs RME s unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch op eration and guarantees a fast and low jitter lock to the digital input signal ADAT input 8 is used to switch the MADI output format from 56 channel to 64 channel mode When ADAT input 8 does not receive a valid input signal the ADI 64...

Страница 11: ...ctionality in Double Wire Sample Split Single Speed and 96k Frame Double Speed In both cases the number of channels is reduced to 28 or 32 At the same time the Matrix Router no longer operates in 8 channel but 4 channel blocks 8 Clock Section 8 1 Clock Configuration The unique ICC technology Intelligent Clock Control allows for a flexible use of both converter units with internal clock 44 1 and 48...

Страница 12: ... in sync the LED will be lit conctantly see below Unfortunately LOCK does not necessarily mean that the received signal is correct with respect to the clock which processes the read out of the embedded data Example 1 The ADI 648 is set to 44 1 kHz INT ernal and a mixing desk having an ADAT output is connected to input ADAT1 The INPUT LED will show LOCK immediately but the mixing desk s clock is us...

Страница 13: ... again and de activate the termi nation Output The word clock output is constantly active providing the current sample frequency as word clock signal In master mode Int the word clock will be fixed to 44 1 kHz or 48 kHz In any other case the sample rate is identical to the one present at the currently chosen clock input When the current word clock source fails the last valid sample rate will be he...

Страница 14: ...For example SPDIF 44 1 kHz word clock a simple square wave signal has to be multiplied by 256 inside the device using a spe cial PLL to about 11 2 MHz This signal then replaces the one from the quartz crystal Big disadvantage because of the high multiplication factor the reconstructed clock will have great deviations called jitter The jitter of a word clock is typically 15 times higher as when usi...

Страница 15: ...ts of word clock delivering devices are designed with very low impedance but all word clock inputs with high impedance in order to not weaken the signal on the chain But there are also negative examples when the 75 Ohms are built into the device and cannot be switched off In this case the network load is often 2 x 75 Ohms and the user is forced to buy a special word clock distributor Note that suc...

Страница 16: ...rough of MIDI from MADI input to MADI output 10 2 Remote Controlling the ADI 648 Up to firmware 1 4 the MIDI port did serve only for transmission of MIDI data via MADI Since firmware 1 5 the unit can be completely remote controlled via MIDI The CPU shown above not only bypasses the MIDI data but also reacts on specific commands Furthermore upon request the CPU will report the compete device status...

Страница 17: ... the CPU A feedback request response from the CPU is sent to MIDI Out and via loopback cable and MADI to the software 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 ADIs with different IDs Options Connect MIDI Ports Start Stop ...

Страница 18: ... to multiple ADAT receivers the ADI 648 can achieve this by simply pushing a button When the MADI input and output are connected directly loopback the user can easily switch between a 1 1 connection and a freely defined router splitter setting 11 3 MADInet MADI is much more flexible and powerful as commonly known To better make clear what MADI realy is a kind of audio network we introduced the ter...

Страница 19: ...6 kHz data via one AES EBU port But Double Wire is still far from being dead On one hand there are still many devices which can t handle more than 48 kHz e g digital tape recorders But also other common interfaces like ADAT or TDIF are still using this technique Because the ADAT interface does not allow for sampling frequencies above 48 kHz a limita tion of the interface hardware the ADI 648 autom...

Страница 20: ...Most people know unbalanced coaxial cables with 75 Ohms BNC plugs they are not expensive and easy to get The optical interface is much more interesting due to its complete galvanic separation but for many users it is a mystery because very few have ever dealt with huge cabinets full of professional network technology Therefore here are some explanations regarding MADI optical The cables used are s...

Страница 21: ... 100 kHz SteadyClock has originally been de veloped to gain a stable and clean clock from the heavily jittery MADI data signal The embedded MADI clock suffers from about 80 ns jitter caused by the time resolution of 125 MHz within the format Common jitter values for other devices are 5 ns while a very good clock will have less than 2 ns The picture to the right shows the MADI input signal with 80 ...

Страница 22: ...NC Optisch Status display Error Sync Audio Matrix Router On Off Input Output Select Reset Clock Source ADAT MADI Clock Section Status display Input Sync Audio Clock Source Input External Word Internal Internal Clock 44 1 48 kHz 96k Frame 88 2 96 kHz Status MADI Output 96k Frame DS word clock ADAT I O MADI I O Wordclock MIDI I O ...

Страница 23: ...User s Guide ADI 648 RME 23 14 Block Diagram excluding MIDI ...

Страница 24: ...all value response data bytes Value Response After being triggered by receiving a request value command device sends a string of all value response data bytes Message type is set to 30h Set Value Sets any number of parameters nn oo can be repeated freely 15 3 MADI Input State Redundancy Mode The MADI input can be BNC or optical When the ADI 648 enters Redundancy mode it uses the other input althou...

Страница 25: ...I 5 ADAT 30h matrix enable x x x 1 Byte 0 disable 1 enable 31h matrix reset x 1 Byte 1 reset 40h matrix output 1 x x x 1 Byte 0 15 input no 16 no input 41h matrix output 2 x x x 1 Byte 0 15 input no 16 no input 42h matrix output 3 x x x 1 Byte 0 15 input no 16 no input 43h matrix output 4 x x x 1 Byte 0 15 input no 16 no input 44h matrix output 5 x x x 1 Byte 0 15 input no 16 no input 45h matrix o...

Страница 26: ...y for incidental or consequential damages resulting from using the ADI 648 17 Appendix RME news and further information can be found on our website http www rme audio com Distributor Synthax Audio AG Am Pfanderling 62 D 85778 Haimhausen Tel 49 08133 91810 Trademarks All trademarks and registered trademarks belong to their respective owners RME SyncAlign DIGI96 Hammerfall and SyncCheck are register...

Страница 27: ...s subject to the following two condi tions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be de termine...

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