AudioLab M-DAC Service Manual

M-DAC

VERSION HISTORY

Rev

V01

Date Update Content

July 10, 2012

First Version

M-DAC

CONTENT

M-DAC

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

Introduction

Specification

Assembly Sketch

Schematic Diagram

ia

Wir ng Di gram

screen of Bottom

Silk Top

Maintenance Alignment Procedure

Assembly Parts List

Electronic Parts List

Product Version Deviation

/

1

2-3

4-5

6-8

9

10-15

16-17

18-19

20-23

24-25

INTRODUCTION

No part of this document may be reproduced or transmitted in any form or by any means,electronic or
mechanical, for any purpose, without the express written permission of International Audio Group
Limited (IAG)

This manual is for the exclusive use of IAG, its approved distributors and approved UK service agents.

No part of this manual shall be transferred to any other party without the express written permission of
IAG.

It is the responsibility of the user to ensure that all the information contained in this manual is current.
Notification for new issues of this manual and minor updates will be given via the IAG web-site or on
request.

This manual has been prepared with the greatest care, it is intended for information only and no liability
shall be accepted for errors or changes to specification.

For further service information, parts lists and updates, please contact our web-site at
www.international audio group.com .

C

2012 International Audio Group Limited. All rights reserved.

M-DAC

1

M-DAC-Specification and Features-P1/2

M-DAC Performance Test

Test condition: AC~253V, COAX: 997Hz Digital Signal,SR: 48kHz
Load: 10 kohms impedance, with Filter NAL setting
Z-out: 20ohms

SPECIFICATION

No. Test Items

1 Output Lev el 997Hz,Digital COAX Input Vrms 2.21 2.22 4.23 4.22

2THD

S/N3

4 Gain 0dBFS Input (0dBV) dB
5 Noise Level no signal,pre-amp out dBV -100.8 -101.4
6 DC Offset To measure the output DC Voltage mV 0.8 0.5
7 Crosstalk L/R Cross talk,refer to 997Hz dB 108 108
8 L/R different L/R different,un-balance dB

9 Phase no reverse deg
10 Freq Respond Refer to 997Hz input as 0dBr,+/-0.5dB Hz
12 Idle Current Idle Current,230VAC mA

Line output, with 22-22kHz BW and A-wtd dB 112 112

Condition Units

stereo 997Hz output 2V % 0.001 0.001
stereo 20kHz output 2V % 0.0005 0.0005

Line output, dB 108 108

RCA

LR LR

7.1

0.05
0

20-20k

18mA

XLR

0.001 0.001

0.0002 0.0002
116 116
120 120

13.2

102.5 102.7

116 116

0.01
0

20-20k

Digital OUT Test

No. Test item Track

1
2
3
4 Digital Output Intensity Vpp >500
5 Level Linearity dBFS -143 -143
6 Frequency response dB 0.5dB 0.01 0.01
7 Output impedance ohm 75±1

8 Sampling Rate kHz

Output Lev el

Harmonic Distortion

L/R phase

32, 44.1,48,96KHz

(16,24bit)

32KHz

44.1KHz 44.1±0.01
48KHz 48±0.01
96KHz 96±0.01

Units Limit L R

dBFS 0±0.05 0 0

% <0.005 0.00001 0.00001

deg ±1 0 0

COAX

580

75

44.1KHz
48KHz
96KHz

0.00001 0.00001

OPT

LR

00

00

/

-143 -143

0.01 0.01

44.1KHz
48KHz
96KHz

M-DAC

32Bit 84.000MHz 512 Element MultiBit Array DAC

.

Asynchronous USB supporting 24 Bits / 96kHz with Remote Control of PC / MAC

.

MediaPlayer via HID support

x2 192KHz 24Bits Coax SPDIF Digital Inputs

.

x2 96KHz Optical Digital Inputs

.

High Current, High Linearity RCA Single Ended & XLR True Balanced with fully discrete

.

JFET CROSS* ClassA Output stage's

High Current, High Linearity CROSS* JFET Class A Headphone Amplifier

.

Triple cascaded Jitter attenuation stages, with triple cascaded Asynchronies Clock

.

domain isolation all but eliminating the First order effects of Jitter from the external input

2

SPECIFICATION

M-DAC-Specification and Features-P2/2

sources on the Digital to Audio Conversion process

.

Selectable DAC Mode or Digital Pre-Amplifier Mode, allowing direct connection to Power
Amplifiers and Active speakers in Digital only systems

.

2.7” High contrast OLED display

.

“Bit Perfect” Digital Data source analyzer

.

Intelligent real-time Bit Depth analysis engine Displays the “True” Bit depth of the Digital
input source

.

Digital Data Decorrelation Engine Decorrelates the fixed “LSB's” data pattern within the
Audio data stream when less then 24Bits. Data decorrelation at the DAC substrate level
reduces both Digital and Analogue Second order effects within the DAC at the silicon Die
level

.

MS Windows LSB Data restoration for “Bit Perfect” reply corrects Windows' LSB rounding
errors. Allows Bit Perfect “Plug and Play” with Windows Media Player

.

ASYNC USB Buffer level display to insure correct functionality and diagnostics of the USB
HOST device inASYNC Audio streaming mode

.

“Actual” or “Nominal” Sampling Frequency display displays the TRUE input sampling
frequency with 1Hz resolution

.

Digital level meters in dB with Peak hold

.

CD / DVD SPDIF subcode embedded Track and Time Display

.

Advanced De-Jittered Optical and Coax SPDIF Output, with USB to SPDIF output.

.

Selectable Optical or Coax Clock-Lock interface allowing “Jitter Free” Clock-Locked
connection with compatible CD transports etc.

.

Full Remote Control + External Remote / BUS I/O loop

.

26 Internal regulated supply rails

.

10 Ultra Low Noise, Low Impedance Discrete Regulators

.

7 User Selectable Digital Filters Fully Software upgradeable via the USB Port

.

Master Clock Jitter less then 3pS Short Term - Measured directly at DAC “XOut”

.

Organic Ultra Low ESR capacitors, High Tolerance Polypropylene film / Foil capacitors,
Ultra Stable Very Low VCR 0.1% MELF SMD resistors, 4 Layer PCB

.

External upgradeable Power supply interface for a future upgrade path

*

CROSS Current Regulated Output Stage Solution

M-DAC

3

ASSEMBLY SKETCH

M-DAC-Product Exploded Drawing- 1/1P

M-DAC

4

ASSEMBLY SKETCH

M-DAC-Packing Exploded Drawing- 1/1P

1

2

3

M-DAC

5

SCHEMATIC DIAGRAM

M-DAC-Mainboard-P1/1

M-DAC

6