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88.2 and 96 kHz), external word clock or the digital input signals. These options are intelligently coupled in a way typical for RME, and easy to apply thanks to a clear and easily understand- able display of the Lock and Sync states.
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 ®...
ADI-648 operates correctly even without changing to 96k Frame mode, because Dou- ble Wire will be converted 1:1 to ADAT (S/MUX). RME's intelligent 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 ADAT optical 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.
EXT LED is constantly lit, otherwise it is flashing. Thanks to RME's Signal Adaptation Circuit, the word clock input still works correctly even with heavily mis-shaped, dc-prone, too small or overshoot-prone signals. Thanks to automatic signal centering, 300 mV (0.3V) input level are sufficient in principle.
Technically every single MADI channel includes several additional bits, containing various in- formation (Channel Status). RME use the usually unused User Bit of channel 56 (channel 28 in 96k Frame mode), to transmit MIDI data invisibly within MADI, ensuring full compatibility.
10.3 Remote Control Software A tiny Windows software 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 Hammerfall DSP MADI (PCI card), offering a direct control of the ADI-648 via MADI.
In case a true Double Speed word clock is needed (88.2 or 96 kHz), press the key 96k FRAME several times, until the LED WCK is lit. Note: The ideal combination is an ADI-648 together with the digital I/O card RME Hammerfall (DIGI9652), which has Sample Split implemented in hardware. This combination offers 12 channels 24 bit/96 kHz, using PC or Mac.
Latest circuit designs like hi-speed digital synthesizer, digital PLL, 200 MHz sample rate and analog filtering allow RME to realize a completely newly developed clock technology, right within the FPGA at lowest costs. The clock's performance exceeds even professional expectations.
Matthias Carstens, 11/2003. Version 1.21 All entries in this User´s Guide have been thoroughly checked, however no guarantee for correctness can be given. RME cannot be held responsible for any misleading or incorrect information provided throughout this manual. Lending or copying any part or the complete manual or its contents as well as the software belonging to it is only possible with the written per- mission from RME.
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