Drawmer DC2496 User Manual

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DC2496

HIGH RESOLUTION

ANALOGUE TO DIGITAL

CONVERTER

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This manual is copyrighted 8 1999 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 W ARRANTY

Drawmer Electronics Ltd., warrants the Drawmer DC2496 high resolution 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.

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

THIS WARRANTY IS IN LIEU OF ALL W ARRANTIES, WHETHER ORAL OR WRITTEN, EXPRESSED, IMPLIED OR ST A TUTORY . DRAWMER MAKES NO OTHER WARRANTY EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMIT A TION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NONINFRINGEMENT. PURCHASER’S SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE REPAIR OR REPLACEMENT AS SPECIFIED HEREIN.

IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE LIABLE FOR ANY DIRECT , INDIRECT, SPECIAL, INCIDENT AL 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. Y ou may have additional rights that vary from state to state, and country to country .

In the interests of product development, Drawmer reserve the right to modify or improve specifica-

tions of this product at any time, without prior notice.

CONTENTS

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

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Radio Frequencies Statement . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 1 - DC2496 Hi Resolution A/D Converter

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Audio Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation and Connection Guide . . . . . . . . . . . . . . . . . . . . 7

Chapter 2 - DC2496 Basic Effects

Front Panel Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 3 - Operation

Setup System using Internal Sine Wave Generator

100Hz/1kHz Setup T one . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1kHz Setup T one at -40dB . . . . . . . . . . . . . . . . . . . . . . . . . 10

100Hz Setup T one at -6dB . . . . . . . . . . . . . . . . . . . . . . . . . 10

Troubleshooting - 1kHz Setup Tone . . . . . . . . . . . . . . . . . . 10

96kHz 24 Bit Recording and Replay

96K 24 Bit A/D Input Recording . . . . . . . . . . . . . . . . . . . . . 12

96K 24 Bit A/D Input Replay from ADA T . . . . . . . . . . . . . . 12

96K 24 Bit A/D Input Replay from TDIF . . . . . . . . . . . . . . . 12

96K 24 Bit Replay from Hard Disk Recorder . . . . . . . . . . 12

Chapter 3 - Operation cont...

48kHz 24 Bit Recording and Replay

48K 24 Bit A/D Input Recording . . . . . . . . . . . . . . . . . . . . . 14

48K 24 Bit A/D Input Replay from ADA T . . . . . . . . . . . . . . 14

48K 24 Bit A/D Input Replay from TDIF . . . . . . . . . . . . . . . 14

48K 24 Bit Replay from Hard Disk Recorder . . . . . . . . . . 14

Multi-Track Copying

Copy ADA T Recording to TDIF. . . . . . . . . . . . . . . . . . . . . . 16

Copy TDIF Recording to ADA T. . . . . . . . . . . . . . . . . . . . . . 16

Copy TDIF/ADA T Hi- Res as Stereo Master . . . . . . . . . . . 16

Reduce 48K 24Bit Triple T racks to 16 Bit Stereo. . . . . . . 16

Chapter 4 - Special Operation Notes

Record Hi-Res Bit Splitting Tracks to ADA T/TDIF . . . . . . . . . . . . 18

Special Digital T ape Recorder Play cases . . . . . . . . . . . . . . . . . . 18

Chapter 5 - DC2496 Information

Software Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Chapter 6 - General Information

If a fault develops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Contacting Drawmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Chapter 7 - DC2496 Data

Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

DRA WMER DC2496

HIGH RESOLUTION ANALOGUE TO DIGIT AL

CONVERTER

SAFETY CONSIDERATIONS

CAUTION - MAINS FUSE

TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE

ONLY WITH A FUSE THAT CONFORMS TO

EIC 127-2. 250 VOL T WORKING, TIME DELA Y TYPE AND

BODY SIZE OF 20mm x 5mm.

THE MAINS INPUT FUSE MUST BE RA TED A T T500mA.

CAUTION - MAINS CABLE

DO NOT A TTEMPT TO CHANGE OR TAMPER

WITH THE SUPPLIED MAINS CABLE.

CAUTION - SERVICING

DO NOT PERFORM ANY SERVICING. REFER ALL SERVICING

TO QUALIFIED SERVICE PERSONNEL.

For the USA

FEDERAL COMMUNICA TIONS 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

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

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.

CHAPTER 1

DRA WMER DC2496 HIGH RESOLUTION

ANALOGUE TO DIGIT AL CONVERTER

INTRODUCTION

Chapter

Key Features

96k 24bit A/D with 130dB dynamic range and very low THD. Simultaneously record 96k/48k 24bit stereo input to 48K (three) or 96K (six)

tracks to ADAT or TDIF 8 track digital tape recorder and stereo 48k 16bit backup (to tracks 7/8) and record an independant backup copy at 48/44.1 20/ 16bits to DA T (using internal Sample Rate Convertor)

DC2496 HI RES A/D CONVERTER

The Drawmer DC2496 is an extremely sophisticated, high resolution analogue to digital converter designed for use in demanding recording and broadcast applications. Both analogue (balanced XLR) and digital (AES/ EBU, S/PDIF , ADA T 8 Channel light pipe and TDIF 8 Channel) I/O is provided as standard. The audio converters are 24-bit and the digital output can be either 16, 18, 20, 22 or 24-bit at sample rates of up to 96kHz. Noise shaped dithering is included and Word Clock input and output is available.

NOT JUST AN A/D CONVERTER BUT ALSO DIGIT AL INTERFACE FOR

RECORDING FROM ONE UNIT TO ANOTHER - WITH A BACKUP A T

THE SAME TIME!

Why 96kHz?

Digital processing has until now been confined to 48kHz sampling frequency . In order to achieve the required bandwidth for professional audio, a very severe low pass filter at 23kHz is required to separate analogue signal frequencies from the clock frequency otherwise unpleasant aliasing will occur. This requires the use of a FIR digital filter which is part of the A/D and D/A converters. Unfortunately these filters cause what is known as >time smear=, where short transients are smeared over a longer time period giving loss of HF detail. At 96kHz sample frequency , the low pass filter is less severe and at twice the frequency , so time smear is considerably reduced.

A second important consideration is the increased audio bandwidth up to 40kHz. This allows harmonics which extend above human hearing to be generated and preserved. These harmonics, although not audible themselves, make a contribution to the sound quality .

Sample Rate Convertor with bit reduction and dither to reduce 96/88.2K 24bit recordings to 48/44.1K 16/20bit for CD masters.

Built in 96/48K high quality D/A to monitor digital signals or record to analog tape.

Dual time constant Stereo Limiter with variable time constants can apply up to 18dB stereo gain to any input signal.

100dB range 64 element stereo signal meter with peak hold. Selection of Noise shaped dither and bit rounding to reduce 96/48/44.1K

recordings to 22, 20, 18 or 16 bits. Digitally copy 8 track stereo or Hi-Res ADA T/TDIF recordings to or from TDIF/

ADAT. Auto identify Stereo or Hi-Res recordings upon ADA T or TDIF replay . Inputs from A/D ADAT optical, TDIF, AES, SPDIF, Outputs to D/A ADAT

optical, TDIF, AES, SPDIF. Seperate Digital Word Sync from D/A TDIF, ADAT, AES, SPDIF or BNC . Rear panel show which sockets are active for easy hookup using Green (for

input signal) and Y ellow (for word clock inputs) LEDs. Built in 100Hz, 1kHz, 10kHz and dual sine wave generator (100Hz Left Ch,

1K Right Ch) sine tone at -40dB, -20dB and variable -24db to -6dB output level to aid connection dificulties and troubleshooting.

Dual PLL for low jitter

Chapter

DC2496 HI RES A/D CONVERTER

AUDIO CONNECTIONS

Analogue Inputs

The inputs and outputs to the DC2496 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 DC2496 to the patchbay. If such measures are necessary , balanced operation is recommended.

AES/EBU

Is 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.

S/PDIF

Is 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.

TDIF

Is via a 25 pin D connector. This is a unique cross-wired cable, supplied by Tascam. It has 8 inputs, 8 outputs all at 24 Bit word resolution as well as TDIF word clock in and out all in the one connector. The maximum recommended length is three metres.

Note: When the TDIF D plug is inserted the main BNC Word Clock out is shifted by 90 degrees fot TDIF use only .

INST ALLA TION PRECAUTIONS

Should a fuse blow, replace it only with the same type and value as the one fitted.

When installing the DC2496, ensure that it is allowed sufficient ventilation and avoid mounting it next to excessively hot pieces of equipment or devices emitting a strong magnetic field such as is often the case with power amplifiers. 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’.

Should the unit require cleaning, use a damp cloth with a little liquid detergent; do not use thinners or spirit cleaners as these may attack the finish.

Word Clock

For external clock synchronisation or when the DC2496 is providing the clock to another source, this is carried out via the 50Ω BNC connector.

ADA T

Connect via an Optical Cable (Light Pipe) with a maximum recommended length of three metres. The cable supports 8 channels at a 24 Bit word resolution. The Drawmer DC2496 provides seperate ADA T input and output as standard.

INST ALLA TION AND CONNECTION GUIDE

Chapter

DC2496 HI RES A/D CONVERTER

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