DRAWMER

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DMS-3

AES GRADE 1 DUAL OUTPUT

ANALOGUE TO DIGITAL CONVERTER

CONTENTS

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Safety Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Radio Frequencies Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Chapter 1 - Introduction

Introduction

Installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Audio Connections & Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 2 - Control Description

Control Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Simple Setup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 3 - General Information

If a fault develops

Block Diagram

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Contacting Drawmer

Specification

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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COPYRIGHT

This manual is copyrighted © 2008 by Drawmer Electronics Ltd. With all rights reserved. Under copyright laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, without the written permission of Drawmer Electronics Ltd.

ONE YEAR LIMITED WARRANTY

Drawmer Electronics Ltd., warrants the Drawmer DMS-3 A2D2, AES Grade 1

Dual Output Analogue to Digital Converter to conform substantially to the specifications of this manual for a period of one year from the original date of purchase when used in accordance with the specifications detailed in this manual.

In the case of a valid warranty claim, your sole and exclusive remedy and

Drawmer’s entire liability under any theory of liability will be to, at Drawmer’s discretion, repair or replace the product without charge, or, if not possible, to refund the purchase price to you. This warranty is not transferable. It applies only to the original purchaser of the product.

For warranty service please call your local Drawmer dealer. Alternatively call

Drawmer Electronics Ltd. at +44 (0)1709 527574. Then ship the defective product, with transportation and insurance charges pre-paid, to Drawmer Electronics Ltd.,

Coleman Street, Parkgate, Rotherham, S62 6EL UK. Write the RA number in large letters in a prominent position on the shipping box. Enclose your name, address, telephone number, copy of the original sales invoice and a detailed description of the problem. Drawmer will not accept responsibility for loss or damage during transit.

DRA

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DMS-3

AES GRADE 1 DUAL

OUTPUT ANALOGUE TO

DIGITAL CONVERTER

This warranty is void if the product has been damaged by misuse, modification or unauthorised repair.

SAFETY CONSIDERATIONS

THIS WARRANTY IS IN LIEU OF ALL WARRANTIES, WHETHER ORAL OR

WRITTEN, EXPRESSED, IMPLIED OR STATUTORY. DRAWMER MAKES NO

OTHER WARRANTY EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT

LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS

FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. PURCHASER’S

SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE REPAIR

OR REPLACEMENT AS SPECIFIED HEREIN.

CAUTION - MAINS FUSE

IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE LIABLE FOR ANY

DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES

RESULTING FROM ANY DEFECT IN THE PRODUCT, INCLUDING LOST

PROFITS, DAMAGE TO PROPERTY, AND, TO THE EXTENT PERMITTED BY

LAW, DAMAGE FOR PERSONAL INJURY, EVEN IF DRAWMER HAS BEEN

ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Some states and specific countries do not allow the exclusion of implied warranties or limitations on how long an implied warranty may last, so the above limitations may not apply to you. This warranty gives you specific legal rights. You may have additional rights that vary from state to state, and country to country.

TO REDUCE THE RISK OF FIRE

REPLACE THE MAINS FUSE ONLY WITH

A FUSE THAT CONFORMS TO IEC127-2.

250 VOLT WORKING, TIME DELAY TYPE

AND BODY SIZE OF 20mm x 5mm.

THE MAINS INPUT FUSE MUST BE

RATED AT 230V=T80mA and 115V=T160mA.

For the USA

FEDERAL COMMUNICATIONS COMMISSION RADIO

FREQUENCY INTERFERENCE STATEMENT

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. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off an on, then the user is encouraged to try to correct the interference by one or more of the following measures:

Re-orient or relocate the receiving antenna.

Increase the separation between the equipment and the receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

Unauthorised changes or modification to this system can void the users’ authority to operate this equipment.

This equipment requires shielded interface cables in order to meet FCC class B limit.

For Canada

CLASS B NOTICE

This digital apparatus does not exceed the Class B limits for radio noise emissions set out in the Radio Interference Regulations of the Canadian Department of

Communications.

CLASSE B AVIS

Cet appareil numérique ne dépasse pas les limites de la classe B au niveau des

émissions de bruits radioélectriques fixés dans le Règlement des signaux parasites par le ministère Canadien des Communications.

CAUTION - MAINS CABLE

DO NOT ATTEMPT TO CHANGE

OR TAMPER WITH THE

SUPPLIED MAINS CABLE.

CAUTION - SERVICING

DO NOT PERFORM ANY SERVICING.

REFER ALL SERVICING TO QUALIFIED

SERVICE PERSONNEL.

WARNING

TO REDUCE THE RISK OF FIRE OR

ELECTRIC SHOCK DO NOT EXPOSE

THIS EQUIPMENT TO RAIN OR MOISTURE.

In the interests of product development, Drawmer reserve the right to modify or improve specifications of this product at any time, without prior notice.

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CHAPTER 1

DRAWMER

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DMS-3: AES GRADE 1 DUAL OUTPUT A/D CONVERTER

INTRODUCTION

Microphones are analogue, speakers are analogue, storage is mostly digital and signal processing can be either analogue or digital, software or hardware based. At some point in the signal path, a high quality Analogue-to-Digital converter is required, which faithfully reproduces analogue signals in the digital domain. Step up the Drawmer A2D2...

The A2D2 is a stereo A/D converter giving simultaneous dual stereo outputs at different selectable sample rates from 44.1kHz to 192kHz - so it is possible to have a main output at, say 192kHz with another at 44.1kHz as a low resolution copy.

Features:

Dual input configuration allows either a fully variable input level from -2dBu to +28dBu via front panel rotary controls or 24 turn precision presets for a fully calibrated input.

Accurate 24 segment peak reading LED bar meters show incoming signal levels from -50dBfs to

0dBfs plus separate overload LEDs.

Each digital output has selectable word length of 16 or 24 bits, with automatic dither generation.

The internal low jitter clock generator is Grade 1 AES standard.

External clock input.

3 word clock outputs to allow the A2D2 to act as master clock generator.

Burr Brown analogue input stages.

The A2D2 uses a linear power supply to minimise interference with the internal clocks.

1 2 3 4 5

1 Input Level for 0dBfs:

Two input level modes are available: In installations with fixed input levels,

Calibrated, recessed left/right, 20 turn pots give precise input levels where very little setup is required. In situations where adjustments have to be made “on the fly” standard Variable left/right controls are provided.

2 Output Sample Rate:

Independantly sets the sample rates for

Output 1 7 and output 2 8 from 44kHz through to 192kHz, plus EXT clock 9 . A

lock led shows the strength of the incoming external clock.

4 On Led:

A LED to show that the unit has power.

3 Word Length:

Independantly sets the Word Length of

Output 1 7 and output 2 8 to either

16 bit Dither or 24 Bit.

5 Output Meter:

V.U. output meter with 24 segment LED per channel plus Overload - ranging from

-50dB to 0 db.

11 10 9

6 Analogue Input:

Individual Left/Right Balanced analogue inputs.

9 Wordclock Input:

The EXT Wordclock input for both sample rate converters.

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Digital Output 1:

One each of S/PDIF, TOSLINK or AES simultaneous outputs. The sample rate is selected via 2 .

Wordclock Outputs:

Three wordclock outputs provided. The sample rate is determined by O.S.R.1 2 .

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Digital Output 2:

One each of S/PDIF, TOSLINK or AES simultaneous outputs. The sample rate is selected via 2 .

IEC and Fuse:

The mains IEC inlet and fuse holder.

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INSTALLATION

The DMS-3 is designed for standard 19" rack mounting occupying 1U of rack space. Avoid mounting the unit directly above power supplies or amplifiers that radiate significant amounts of heat. If the unit is to be used in a mobile situation, it is strongly recommended that the rear of the unit is supported in the carrying rack to avoid bending the front panel rack mounting ‘ears’. Use fibre or plastic washers to prevent the front panel becoming marked by the mounting bolts.

POWER CONNECTION

The A2D2 will be supplied with a power cable suitable for domestic power outlets in your country. For your own safety, it is important that you use this cable to connect to the mains supply earth. The cable must not be tampered with or modified.

The power supply socket has an integral fuse drawer containing the power fuse of the same value, to suit the mains voltage for which the unit has been supplied. Removal of the drawer is only possible with the power cord removed. The fuse should never blow under normal operation. If the fuse is suspected of having blown, then a fault will have occurred and this fault condition should be inspected by a qualified service engineer. When replacing the fuse, always comply with the Safety Instructions.

If the unit is to be used with a mains input operating voltage different to that for which the unit is supplied, the following procedure must be carried out by a technically competent person, (see following diagram)

1: Disconnect the unit from the mains.

2: Using a number 1 size pozidrive screwdriver, remove the nine self -tapping screws that retain the top cover. Five screws are located on the top cover; and two screws on either side. Slide off the cover.

3: Inside the unit slide the voltage change-over switch (VS1) until the correct (or nearest) mains input voltage is visible on the switch actuator.

(see fig.4)

4: Replace the cover and the nine screws.

5: In the fuse draw change the fuse to suit the following values:

For 230 Volt operation alter the fuse to a similar type rated at T80mA.

For 115 Volt operation alter the fuse to a similar type rated at T160mA.

VS SWITCH

FUSE

AUDIO CONNECTIONS

Analogue Inputs

The preffered inputs to the A2D2 are electronically balanced and would normally be connected to your system via a patchbay. Should unbalanced operation be required, simply ground pin 3 on the XLR connectors.

If earth loop hum problems are encountered, do not disconnect the mains earth but instead, try disconnecting one end of the signal screen on the cables connecting the A2D2 to the patchbay. If such measures are necessary, balanced operation is recommended.

S/PDIF Input

Via a high quality RCA type phono jack where the data conforms to the SonyJ PhillipsJ Digital InterFace format. Because this connector only provides an unbalanced termination, the recommended maximum length for this cable is 3 metres, even with very high quality cable.

AES Input

Via an XLR connector designed to be used with standard balanced microphone cable (20 metres maximum), wired pin

1 screen, pin 2 and 3 balanced data, and the XLR shell connected to the chassis. Having many short cables joined together is not advisable as each connector can cause undesirable signal reflections.

The output socket fully conforms to the EMC standards; if the unit is to be used where it may be exposed to high levels of disturbance, such as found close to a TV or radio transmitter, it is suggested that the screen of the data cable be connected to the chassis connection on the XLR type connector rather than to pin 1.

If ground loop problems are encountered, never disconnect the mains ground, but instead, try disconnecting the signal screen on one end of each cable connecting the outputs.

TOSLINK (or EIAJ)

The real benefit of TOSlink is that it is not susceptible to electromagnetic noise, however, it is highly recommended that a very good quality cable is used as the plastic conductors used in cheap cables can damage data. Additionally performance is compromised over long lengths of cable, as the signal strength weakens due to impurities in the conductive material, therefore lengths of no longer than five metres are recommended unless using a signal booster..

Though the connectors are the same TOSLink and ADAT

Optical are not compatible with each other.

Word Clock

Use only good quality digital or video coax (not aerial downlead) cable for the word-clock signals, terminated with the correct type of 75 Ω BNC connectors - inferior cables will introduce jitter and will completely undermine the performance benefits which might be achieved by using a master clock in the first place!

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SIMPLE CONNECTION GUIDE

5

CONTROL DESCRIPTION

CHAPTER 2

The Drawmer DMS-3 A2D2 has been meticulously designed to faithfully, and transparently recreate your analogue signal in digital in as simple and intuative method as possible. A high quality Burr Brown input stage has been incorporated, coupled with the AES Grade 1 digital converted outputs, making the A2D2 perfect for recording, mastering and postproduction from all of your analogue to digital devices. The analogue input is fed simultaneously to two seperately controlled outputs both in AES/EBU, SPDIF and TOSLINK formats enabling a backup copy to be made of the signal, as well as solving any connectivity problems and allowing signal distribution.

INPUT LEVEL for 0dBfs

MODE One switch toggles between Variable and Calibrated modes of input level gain.

VARIABLE

CALIBRATED

In situations where the input levels can vary from place to place, such as in outside broadcasts, or live venues, a variable input level has been provided, with accurate individual left/right control, to provide quick setup. This ranges from +28dBU to 0dBU.

In the studio, where input and output levels will be calibrated and under better control, a calibrated input gain option has been provided, in the form of very accurate (24 turn) left/right potentiometers ranging from +28dBU to 0dBU. These require a small screwdriver to operate and so once set are less likely to be accidentally adjusted.

Output Sample Rate

The A2D2 has dual independant stereo digital outputs at different selectable sample rates from 44.1kHz to 192kHz - so it is possible to have a main output at 192kHz with another at 44.1kHz as a low resolution copy.

O/P 1

W/Length

O/P 2

W/Length

6

The outgoing sample rate for O/P1 of the DMS-3 can be set using the two sample rate switches on the top row - the left moving down rate and the right moving up, with a corresponding LED being lit to show the current sample rate. The DSM-3 generates six Ultra Low Jitter sample rates - 44.1k, 48k, 88.2k, 96k, 176.4k

and 192k, all stable to <1ppm, and in addition can also operate at the sample rate generated by an external source. With the Leds set to EXT the sample rate is set by the Wordclock input (as located on the rear panel).

A lock LED is provided on the front and operates when the EXT clock signal is strong.

O/P 1 also sets the sample rate of the three wordclock outputs on the rear panel.

The top switch provides either 16 Bit Dither or 24 Bit operation for O/P1.

The outgoing sample rate for O/P2 can be set using the two sample rate switches on the bottom row and operates in exactly the same way as with O/P1. When on EXT the sample rate is set using the same

Wordclock input as with O/P1.

The bottom switch provides either 16 Bit Dither or 24 Bit operation for O/P2.

Output Level Metering

An accurate 24 segment peak reading LED bar meter shows the incoming signal level from

-50dBfs to 0dBfs plus separate overload LEDs for each channel.

QUICK SETUP PROCEDURE

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Plug in the left and right channel inputs on the rear of the unit, preferably using balanced wiring.

.

On the front panel set the “Input Level for 0dBfs” mode switch to the correct setting - calibrated if in a studio and the entire system is calibrated, or variable in any other situation.

Whilst paying close attention to the Output Level Meter, adjust the relevant input gain (The input controls are analogue and thus measured in dBU whilst the meter displays the digital output of the unit in dBfs, hence the +28 to 0 dBU controls). The levels should be set so that the meter is as close to 0dBfs as possible without drifting into overload, to obtain the optimum output levels.

With your desired digital equipment connected to the any of the O/P 1 digital outputs (they work simultaneously), and also connected to the wordclock outputs, on the front panel set the top row

(O/P1) of the Output Sample Rate to the desired rate, and set the Bit Depth.

Where a digital backup of your audio is required, connect the equipment to the O/P 2 digital

outputs on the rear panel, and set the bottom row (O/P2) of the Output Sample Rate to the desired rate, and set the Bit Depth.

If you wish to set the wordclock using an external source, plug in the device to the Wordclock

Input on the rear panel and set either or both Output Sample Rates to EXT. If the signal is strong the Lock led will light, if weak or unstable the Led will flicker or not light at all. In this case the external device and wiring should be checked.

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CHAPTER 3

A2D2 DMS-3 GENERAL INFORMATION

IF A FAULT DEVELOPS

For warranty service please call Drawmer Electronics Ltd. or their nearest authorised service facility, giving full details of the difficulty.

Analogue Inputs

SPECIFICATION

Left/Right balanced XLR

(Pin 2 Hot)

Frequency Response 20Hz-20kHz +/- 0.1dB

A list of all main dealers can be found on the Drawmer webpages.

Input Level Range for 0dBFs -2.0dBU to +28dBU

Crosstalk -103dBFs @ 1kHz

-84dBFs @ 10kHz

On receipt of this information, service or shipping instructions will be forwarded to you.

Factory Calibration of Presets +18dBU = 0dBFs

No equipment should be returned under the warranty without prior consent from Drawmer or their authorised representative.

For service claims under the warranty agreement a service

Returns Authorisation (RA) number will be issued.

Write this RA number in large letters in a prominent position on the shipping box. Enclose your name, address, telephone number, copy of the original sales invoice and a detailed description of the problem.

Authorised returns should be prepaid and must be insured.

All Drawmer products are packaged in specially designed containers for protection. If the unit is to be returned, the original container must be used. If this container is not available, then the equipment should be packaged in substantial shock-proof material, capable of withstanding the handling for the transit.

THD+Noise 0dBFs >101 dBFs

-1dBFs >103dBFs

-3dBFs >105dBFs

-6dBFs >107dBFs

-12dBFs >110dBFs

A/D Converter

2 x Temperature Compensated Xtal Oscillators (TCXOs)

AES GRADE 1 Stability,

Tolerance +/-1ppm (0-60 Celcius),

<<+/-1ppm (15-30

Celcius)

2 x Stereo Sample

Rate Converters: full up/down conversion

44.1, 48, 88.2, 96, 176.4, and 192kHz

2 x AES/EBU Neutrik XLR

2 x S/PDIF Outputs

2 x TOSLink

Neutrik XLR

Coaxial, RCA Type

JIS F05

CONTACTING DRAWMER

Drawmer Electronics Ltd., will be pleased to answer all application questions to enhance your usage of this equipment. Please address correspondence to:

Bit Depth

Word Clock Outputs

Output impedance

General

Power Supply:

24Bit and 16Bit Dither

22.5 ohms giving 4v pk-pk into 75 ohms

Drawmer (Technical Help line)

Coleman Street

Parkgate

Rotherham

S62 6EL

UK

Alternatively contact us by E-mail on : [email protected]

Further information on all Drawmer dealers, Authorised service departments and other contact information can be obtained from our web pages on:

Fuse Rating

Fuse Type

Dimensions:

Weight

230Volt or 115V at

50-60hZ, 16VA

80mA for 230Volt,

160mA for 115Volt.

CONFORMING TO:

IEC127-2

20mm x 5mm, Class 3

Slow - Blow

250Volt working

1u, 19" Rack Mount,

482mm(W) x 44mm(H) x

145mm(D)

2.213 kg http://www.drawmer.com

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BLOCK DIAGRAM

Ref:1v01 B 09-09-08

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