8-Channel Sample Rate Converter
ADAT
®
optical - TDIF - AES/EBU Interface








SteadyClock

TDIF-1
24 Bit Interface

2
User's Guide ADI-192 DD © RME



General

1 Introduction ...............................................................4
2 Package
Contents .....................................................4
3
Brief Description and Characteristics.....................4
4
First Usage - Quick Start
4.1 Controls and Connectors .......................................5
4.2 Quick Start .............................................................6
4.3 The DD plain and simple........................................7
5 Warranty.....................................................................8
6 Appendix ....................................................................8



Usage and Operation

5
Front Panel Controls
5.1 INPUT MONITOR ................................................12
5.2 SRC INPUT..........................................................12
5.3 CLOCK SECTION................................................13
5.4 AES OUTPUT ......................................................14
5.5 TDIF OUTPUT .....................................................14
5.6 ADAT OUTPUT....................................................14
6 Inputs
6.1 AES/EBU..............................................................15
6.2 TDIF .....................................................................16
6.3 ADAT Optical .......................................................17
7 Outputs
7.1 AES/EBU..............................................................18
7.2 TDIF .....................................................................19
7.3 ADAT Optical .......................................................20
8
The Sample Rate Converter
8.1 General ................................................................21
8.2 Operation .............................................................21
8.3 Clock Decoupling using the SRC.........................23
8.4 The SRC as Signal Conditioner ...........................23
9 Word
Clock
9.1 Word Clock Input and Output...............................24
9.2 Technical Description and Background ...............25
9.3 Cables and Termination.......................................26



Technical Reference

10 Technical
Specifications
10.1 Inputs....................................................................28
10.2 Outputs.................................................................29
10.3 Digital ...................................................................29
10.4 Sample Rate Converter .......................................30
10.5 General ................................................................30
10.6 Connector Pinouts................................................30
10.7 Firmware ..............................................................31
11 Technical
Background
11.1 Terminology .........................................................32
11.2 Lock, SyncCheck and SyncAlign .........................33
11.3 DS Double Speed .............................................34
11.4 QS Quad Speed................................................34
11.5 AES/EBU SPDIF ...............................................35
11.6 Group Delay I/O Latency ..................................36
11.7 SteadyClock .........................................................37
12 Block
Diagram .........................................................38

User's Guide ADI-192 DD © RME
3



User's Guide




ADI-192 DD






























General


4
User's Guide ADI-192 DD © RME


1. Introduction

With the ADI-192 DD you have an incredibly versatile digital interface to your supply. The suc-
cessor of the highly successful ADI-8 DD is a completely re-engineered device, designed to be
the most powerful format and sample rate converter ever. What at first looks like a simple
AES/TDIF/ADAT format converter, turns out to be the universal problem solver at a closer look.
From small project studios to broadcast and television, the Universal Format Converter is the
perfect link between the formats mostly used today.

As a consequent continuation of RME's world-wide successful ADI series, the 192 DD also
contains elaborate technology and the latest integrated circuits. The ADI-192 DD is a uniquely
powerful and high-quality device, which will excite you even after many years of operation.

This manual has been divided into three parts:
The first part is written as quick start guide. Even the first time user will be successfully up
and running with most of the typical applications adressed by the ADI-192 DD. The second part contains both basic and detailed information on all modes supported by the
ADI-192 DD, including sample multiplexing via Double and Quad Wire technology. The third part contains useful background information about the methods and technologies
found in the ADI-192 DD.

In case you want to dive deeply into the powerful features of the ADI-192 DD, please start with
chapter 11.1, Terminology.


2. Package Contents

Please check that your ADI-192 DD package contains each of the following:
ADI-192
DD User's
Guide Power
chord


3. Brief Description and Characteristics

The ADI-192 DD consists of three 8-channel digital format converters, in a standard 19" box
with 1 unit height. The compact device has numerous extraordinary features like Intelligent
Clock Control (ICC), SyncCheck
®
, SyncAlign
®
, Bitclock PLL, patchbay functionality and active
jitter suppression through SteadyClock. Switchable high-end sample rate converters (SRC) in
reference quality allow for both sample rate conversion and clock decoupling on the highest
level.

All of the ADI-192 DD's I/Os support 192 kHz/24 bit. Since ADAT optical and TDIF are restricted
to 48 kHz, and AES is often limited to 48 or 96 kHz as well, the ADI-192 DD supports the so
called Sample Multiplexing in a unique way. Be it Double Wire, Quad Wire, S/MUX or S/MUX4
the ADI-192 DD receives and transmits in all these modes, and turns out to be the world's only
sample rate converter that can operate in these modes using all three interface formats.

The format conversion between AES/EBU, ADAT and TDIF operates in all directions at the
same time. LEDs of different colours show the present state of incoming and outgoing signals
and of the internal processing in a clear way.

The unique Intelligent Clock Control (ICC) allows for a flexible use with internal clock (44.1 up to
192 kHz), external word clock, or the digital input signals, thanks to a clear and easily under-
standable display of the Lock and Sync states. In short: the ADI-192 DD is a true Intelligent
Audio Solution.

User's Guide ADI-192 DD © RME
5

4. First Usage Quick Start

4.1 Controls and Connectors


The front of the ADI-192 DD features nine buttons and 48 LEDs, providing all necessary means
for a detailed configuration of the unit, plus an optical SPDIF I/O with TOSLINK connectors.

INPUT MONITOR indicates a valid input signal separately for each digital input. Additionally,
RME's exclusive SyncCheck indicates if one of these inputs is locked, but not synchronous to
the others. See also chapter 5.1 and 11.2.

SRC INPUT defines source and frequency range of the sample rate converter's input signal.

In the CLOCK SECTION the current clock reference and frequency multiplier is chosen.

In the AES OUTPUT section, souce, channel status and the optional sample multiplexing of the
AES/EBU outputs is selected.

TDIF OUTPUT defines which input signal appears at the TDIF output.

ADAT OUTPUT defines which input signal appears at the ADAT output.

The optical SPDIF I/O allows to use the first AES I/O port via TOSLINK cable.


The rear of the ADI-192 DD provides all the connections: eight AES/EBU (XLR), four ADAT
optical (TOSLINK), two TDIF (D-sub 25), three word clock (BNC), and mains power.

ADAT I/O MAIN (TOSLINK): Standard ADAT optical port.

ADAT I/O AUX (TOSLINK): Transmits further channels when sample multiplexing is active.

AES/EBU INPUTS (XLR): Transformer-coupled, high sensitivity, therefore accepts SPDIF sig-
nals as well.

AES/EBU OUTPUTS (XLR): Transformer-coupled, fully AES/EBU compatible.

TDIF-1 MAIN (D-sub 25): Standard TDIF port.

TDIF-1 AUX (D-sub 25): Transmits further channels when sample multiplexing is active.

WORD IN (BNC): A push switch allows to activate internal termination (75 Ohms). When termi-
nation is activated the yellow LED besides the switch lights up.

WORD OUT STD (BNC): Standard word clock output.

WORD OUT TDIF (BNC): Special word clock output for TDIF-based devices.

IEC receptable for power connection. The specially developed, internal hi-performance switch
mode power supply makes the ADI-192 DD operate in the range of 100V to 240V AC. It is
short-circuit-proof, has an integrated line-filter, is fully regulated against voltage fluctuations,
and suppresses mains interference.