RME ADI-648 [13/32] Clock section

User's Guide ADI-648 © RME

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.

With the Matrix Router de-activated, all ADAT channels are copied to the MADI format in a logi-

cal order:

ADAT In 1 2 3 4 5 6 7 8

MADI Out 1-8 9-16 17-24 25-32 33-40 41-48 49-56 57-64

When activating the 96k Frame mode, channel distribution changes as follows:

ADAT In 1 2 3 4 5 6 7 8

MADI Out 1-4 5-8 9-12 13-16 17-20 21-24 25-28 29-32

As the device internally always operates in Sample Split mode, the Matrix won't change its func-

tionality in Double Wire, Quad Wire (Sample Split = Single Speed) and 96K Frame (Double

Speed). In both cases the number of channels is reduced to 28/32 or 14/16. At the same time

the Matrix Router no longer operates in 8-channel, but in 4-channel or 2-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 kHz, 88.2 and 96 kHz in DS mode), external word clock or

the digital input signals. All options are intelligently coupled and easily applicable and under-

standable, thanks to a clear display of the corresponding lock state.

As clock source, INTERNAL (crystal), EXTERNAL (BNC word clock) and INPUT (the digital

input signal ADAT/MADI) can be chosen. If the clock signal is present, the corresponding LED

will light constantly. If no signal is present, the LED will flash.

The ADI-648 can extract its reference clock directly from the MADI signal. In most cases an

additional word clock will not be necessary.

INPUT

As displayed on the front panel, the CLOCK SOURCE for the INPUT setting can be the ADAT

or MADI input. A missing or invalid clock source signal is indicated by flashing of the corre-

sponding LED.

EXT.

With EXTERNAL, the ADI-648's word clock input is used as clock reference. The LED will flash,

if the word clock is missing or unusable.