M2TECH Evo Clock User manual

M2TECH
EVO CLOCK
HIGH PERFORMANCE CLOCK GENERATOR
USER MANUAL
REV. P R B – 12/2011

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
2
M2Te h
www.m2tech.biz
Warning!
Changes or modifications not authorized by the manufacturer can invalidate the
compliance to CE regulations and cause the unit to be no more suitable to use. The
manufacturer refuses every responsibility regarding damages to people or things
due to the use of a unit which has been subject to unauthorized modifications or to
misuse or to malfunction of a unit which has been subject to unauthorized
modifications.
This unit is compliant with the following CE regulations: CEI E 55022:2009 Class B (Radiated Emissions),
CEI E 55024:1999, CEI E 55024:A2/2003, CEI E 55024:IS1/2008 (Radio Frequency Electromagnetic
Fields, 50Hz Magnetic Field Immunity Test and Electrostatic Discharges – ESD).
Recycling
The label above, printed on the product case, indicates that the product, when no more usable, can’t be
treated as generic garbage, but must be disposed of at a collection point for recycling of electrical and
electronic equipment, in compliance with the WEEE regulation (Waste of Electrical and Electronic
Equipment).
By making sure that this unit is correctly recycled, you will help preventing potential damages to environment
and human health, which could be caused by a wrong treatment of this product as generic garbage.
Materials recycling helps saving natural resources. For more in-depth information about recycling this
product, please contact M2Tech Srl.

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
3
M2Te h
www.m2tech.biz
Dear customer,
thank you for purchasing E vo C LOCK. What you have is a high performance word clock
and master clock generator with many unique features conceived to obtain the best audio
performance in conjunction with the hi F a e E vo as well as stand-alone.
E vo C LOCK features two high precision, low phase noise temperature compensated
crystal oscillators, custom-made for M2Tech, low-noise regulators to avoid injecting jitter
by the supplies, transformer-coupled outputs and a wide range of frequencies. Two
outputs are available: one is specifically designed for the hi F a e E vo, the other is for more
general usage with other market equipment which accept word clocks. 75 Ohms
impedance matching is an option for the word clock output.
An hi F a e E vo fed by the very stable and clean clock from an E vo C LOCK delivers very
high performance, better than those allowed by the stock (and cheaper) oscillators inside
the hi F a e E vo.
We feel that your expectations will be fulfilled by E vo C LOCK: you’ll hear your music in a
way like never before, prepare for a whole new experience!
To further increase the jitter performance from your E vo C LOCK, we suggest using an E vo
S UPPLY to power it.
adia Marino, CEO
Please annotate here your E vo C LOCK serial number for future reference:
S/ : ____________________________________
Date of purchase: _________________________

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
4
M2Te h
www.m2tech.biz
INDEX
1. Unpacking........................................................................................................................5
2. Front Panel ......................................................................................................................6
3. Back Panel.......................................................................................................................7
4. Connections.....................................................................................................................8
5. Digital Audio connections and jitter..................................................................................9
6. Technical Specifications ................................................................................................10

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
5
M2Te h
www.m2tech.biz
1. Unpacking
The E vo C LOCK box contains the following items:
• E vo C LOCK
• 9V/2A wall adaptor
Should any item be missing, please contact your dealer for a warranty claim.

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
6
M2Te h
www.m2tech.biz
2. Fr nt Panel
1
2
3
4
Figure 1
1) Supply input. Apply 9V
DC
from the wall adaptor provided in the package of from an
E vo S UPPLY. Another power supply may be used if necessary, but user must be aware that
in this case the warranty is void. Tip is positive, ring is negative. A minimum current of
500mA is necessary. This input is protected against polarity inversion.
2) MCLK utput. Master clock output dedicated to the HI F ACE E vo. This output delivers
22.5792MHz or 24.576MHz, with 3.3Vpp on 75 Ohms load. This output may also be used
with other equipment, but users must be aware that connecting to a high impedance load
may lead to voltages outside the allowed range for logic circuits. A 75 Ohms cable should
be used for best performance.
3) WCLK utput. Word clock output. This is a very versatile output which delivers all the
most common word clocks, including some “super clocks” at 5.6448MHz (44.1kHz * 128),
6.144MHz (48kHz * 128), 11.2896MHz (44.1kHz * 256) and 12.288MHz (48kHz * 256).
Output impedance can be low-Z (3.3Vpp on high impedance load) or 75 Ohms (3.3Vpp on
75 Ohm load for matched connection). When the latter option is selected, a 75 Ohms
cable should be used for best performance.
4) P wer indicat r. Turns on when the stock wall adaptor or the E vo S UPPLY are
connected to the E vo C LOCK.

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
7
M2Te h
www.m2tech.biz
3. Back Panel
5
6
7
Figure 2
5) WCLK utput impedance select r. Allows to choose the matching mode for the
WCLK output. The upper position is for 75 Ohms matched lines, the lower position is for
high impedance WCLK inputs. When in doubt, try first the latter setting to avoid damages
to high impedance inputs driver by a 75 Ohms generator (in fact, when a 75 Ohms
generator is connected to a high impedance load, the actual output level is double as the
voltage obtained when the load is 75 Ohms).
6) WCLK select r. This rotary switch allow for selecting between the various WCLK and
“super clock” frequencies that can be obtained at the WCLK output. Each position selects
a pair of values, the effective selected value depending on the setting of the MCLK
selector (n°7, please read below). As an example, to obtain 192kHz, select position
“176.4K/192K” and set the MCLK switch to the lower position, as in Figure 2.
7) MCLK select r. Allows to choose between 24.576MHz and 22.5792MHz as base
frequency to produce the output clocks. The setting of this selector affects both outputs.
When using the E vo C LOCK together with an HI F ACE E vo, use the upper position
(22.5792MHz) for files with 44.1, 88.2 and 176.4 sampling frequency; use the lower
position (24.576MHz) for files with 48, 96 and 192 sampling frequency.

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
8
M2Te h
www.m2tech.biz
4. C nnecti ns
Connect your equipment with word clock input or your hi F a e E vo to the E vo C LOCK
using suitable interconnects. We recommend a 75 Ohms cable when using the MCLK
output and when feeding a 75 Ohms input.
Connect the output plug of the wall adaptor or E vo S UPPLY to the supply connector (Page
6, no.1) of E vo C LOCK.

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
9
M2Te h
www.m2tech.biz
5. Jitter s urces in a digital system
Jitter is the main detriment factor in a digital system. Even asynchronous connections
based on precision oscillators may fail to achieve the ultimate performance theoretically at
their hand due to jitter which is injected in the system.
Jitter has various causes. One is the inherent phase noise in every oscillator. Different
kinds of crystal oscillators allow for different phase noise, thus different jitter levels. The
most basic crystal oscillator is sensitive to many phase noise sources: power supply,
coupled EMI, internal instabilities of the quartz, random temperature changes. Precision
XO have an internal compensation for the power supply noise, while TCXO (temperature
compensated crystal oscillators) have a reduced temperature sensitivity thanks to specific
compensation circuits. OCXO (oven compensated crystal oscillators) theoretically allow for
the lowest phase noise.
In commercial circuits, an OCXO is a waste of money (they are very expensive), as the
environmental EMI and the power supplies which are generally used inject far more noise
then the theoretical device’s noise floor.
A good TCXO, with very low phase noise, coupled to low noise supplies in a well-shielded
metal cabinet is the best choice for a cost-effective, high performance clock generator.
The E vo C LOCK is designed keeping this guidelines in mind: very low phase noise custom
made TCXO’s are used, along with special low noise regulators to achieve very high
performance.

E vo C LOCK
HIGH PERFORMANCE CLOCK GENERATOR
REVISION P r B – DECEMBER 2011
Copyright © 2011, M2Tech Srl
10
M2Te h
www.m2tech.biz
6. Technical Specificati ns
Supply voltage: ................................. 9V
DC
Power consumption: ......................... 150mA
Word clock frequencies (kHz): .......... 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384
Super clocks (MHz)........................... 5.6448, 6.144, 11.2896, 12.288
Master clocks (MHz) ......................... 22.5792, 24.576
Output voltage: ................................. 3.3V
PP
on 75 Ohms matched line (MCLK), 3.3V
PP
on 75 Ohms matched line or on hi-Z line (WCLK)
Phase noise (@ 10Hz):..................... -100dBC/Hz min
Phase noise (@ 100Hz):................... -130dBC/Hz min
Phase noise (@ 1KHz): .................... -145dBC/Hz min
Precision:.......................................... +/- 1.5ppm 0°C to 50°C
Temperature stability: ....................... +/-1ppm
V
CC
stability: ...................................... +/-0.3ppm
Operative temperature range:........... 0°C to 50°C
Size: ................................................. 105x50x104mm (cabinet)
105x50x150mm (with connectors)
Weight:.............................................. 400g