Lavry DA2002 Скачать руководство пользователя страница 10 | Manualshive

Страница: 10 / 15

Lavry DA2002 Скачать руководство пользователя страница 10

DA2002

Operation

8

PLL Mode and CrystalLock™ Mode

The DA2002 features a very low jitter

PLL Mode

that prevents jitter in the input digital audio

signal from degrading DA conversion quality. The PLL mode is recommended for operation of
the DA2002 with inputs of 88.2 or 96 kHz. The default setting is PLL mode and is indicated by
the Sample Frequency indicator slowly blinking.

For additional jitter reduction with inputs of 44.1 or 48 kHz, select the

CrystalLock™ Mode.

The CrystalLock™ mode is indicated by the Sample Frequency indicator staying constantly
illuminated.

To enable CrystalLock™ mode, press and hold the

POLARITY

button for 1.5 seconds. The

Sample Rate indicator will become steadily illuminated. To return to PLL mode, press and hold
the

POLARITY

button again. This mode setting is retained when power is removed.

Power and Fusing

The DA2002 operates at 50 or 60 Hz, and has two line voltage selections, 115 volts and 230
volts. Voltage selection is made in the power input module on the rear panel. Always disconnect
the AC power cord before checking the fuses or changing the voltage setting.

The fuse holder is red in color, and the voltage setting indication printed on it is in white
lettering. This setting is visible through a small “window” in the hinged cover located next to the
AC power switch and input connector. To change or check the fuses or change the operating
voltage, carefully open the cover by lifting the right edge and pull the red fuse holder straight out
of the power input module. The voltage is set by turning the red fuse holder so the desired
operating voltage is visible when the fuse holder’s cover is closed. Please Note: To avoid
cracking the fuse holder, if a screwdriver is used to gently pry the red fuse holder out of the input
module, please do not pry on the top or bottom of the fuse holder- only the right side (as viewed
from the rear of the DA2002).

115 volts operation requires two 1/2 ampere 250 volt fast blow fuses; 230 volt operation requires
two 1/4 ampere 250 volt fast blow fuses. Both American and European size fuses can be
accommodated. Operation up to 240 volts is possible with no change in performance using the
230 volt setting.

Maintenance

The Model DA2002 is an auto-calibrating converter requiring no periodic adjustments. The unit's
reliance on linear power supplies and discrete class A analog circuitry generates a significant
amount of heat (25 watts maximum). The temperature rise is no cause for concern, but allowing
for some airflow both above and below the unit is recommended.

The front panel is gold plated (24 karat gold). Use a soft cloth (and plain water, if necessary) to
clean fingerprints.

«
...
8
9
10
11
12
...
»

Содержание DA2002

Страница 1: ...Model DA2002 High Resolution Digital to Analog Converter Operations Manual ...

Страница 2: ...Lavry Engineering Inc P O Box 4602 Rolling Bay WA 98601 360 598 9757 http www lavryengineering com E Mail techsupport lavryengineering com Revision 1 7C December 7 2011 ...

Страница 3: ...ormance and pure enjoyment of the artistic experience The no compromise approach of designer Dan Lavry to the architecture of the DA2002 resulted in a unique design with unparalleled accuracy As a classically trained musician he brings more than decades of engineering experience to his designs a lifetime of playing and listening to acoustic performance has honed his ability to discriminate subtle ...

Страница 4: ...omatic self calibration A large number of extra codes enable the addition of digital DC offset to the signal path without signal clipping The DC offset provides superior low level detail by keeping low level signals away from the most significant bit transitions A quad switch deglitcher circuit removes the unwanted transition glitch energy In both PLL Mode and CrystalLock Mode the DA2002 eliminate...

Страница 5: ...nal Connection 5 Analog Outputs 6 Analog Output Level 6 Turn On Sequence 7 Polarity Inversion 7 PLL Mode and CrystalLock Mode 8 Power and Fusing 8 Maintenance 8 Part II Theory of Operation Oven control 9 Calibration 9 Timing and Deglitcher 10 Jitter Removal 11 Output Filter and Drivers 11 Part III Specifications 12 Limited Warranty 13 ...

Страница 6: ...DA2002 Table of Contents 4 ...

Страница 7: ...CT between Search Mode and Manual Mode The mode selected is retained when power is removed In Search Mode each time the INPUT SELECT button is pressed the DA2002 will scan the inputs for the next input with a valid signal present It will skip the inactive input connectors where no signal is present The default setting is Search Mode enabled In Manual Mode each press of the INPUT SELECT button move...

Страница 8: ...d mode position the jumpers are set to 90 degrees with respect to the front panel Pin 1 of the XLR connectors is connected to ground potential for proper cable shield connection The LEFT OUTPUT and RIGHT OUTPUT IEC signals are always unbalanced and are not affected by J8 and J10 jumper settings Analog Output Levels The analog output level at the IEC connectors for a full scale digital input signal...

Страница 9: ...tive the unit steps through the input ports continuously as indicated by the input select lamps if in Search Mode Most DAC s contains relays for the purpose of muting the output during turn on allowing the DAC to settle to proper operating conditions The DA2002 contains no relays in order to avoid signal degradation associated with relay contacts The unit minimizes turn on spikes by incorporating ...

Страница 10: ...e through a small window in the hinged cover located next to the AC power switch and input connector To change or check the fuses or change the operating voltage carefully open the cover by lifting the right edge and pull the red fuse holder straight out of the power input module The voltage is set by turning the red fuse holder so the desired operating voltage is visible when the fuse holder s co...

Страница 11: ...mparison against a reference level tells the processor the required adjustments The voltage difference between any given network node and the reference is greatly amplified and then fed to a strobing comparator see multiplexers for calibration and error amplifier and comparator gain blocks in the simplified diagram The processor strobes the comparator and reads its output The strobing is repeated ...

Страница 12: ...l value The deglitcher circuit is in off state about half a sample time and on for the rest of the time The on time is the critical time and no digital activity takes place anywhere near the analog circuits The settled signals are fed to the output filter with minimum disturbance The deglitcher off time settling requires the circuit to block as much of the transitions from feeding forwards to the ...

Страница 13: ...hanged by tiny amounts 1ppm and not very often 15 seconds or more in a manner allowing it to track only very long term average drift Using such an approach with ordinary PLL will cause loss of lock because the slight variations in incoming data rate cause loss of correspondence between the input and the too steady of a clock circuit The DA2002 CrystalLock approach stores enough data in a dedicated...

Страница 14: ...k mode varispeed Crystal lock tracking 1ppm 15 seconds Channel separation 100dBFs at 1KHz Flatness response 05dB 10Hz 20KHz Phase linearity 2 degrees 10Hz 20KHz Digital inputs Two AES EBU 110 Ohm transformer isolated One Consumer 75 Ohm transformer isolated Analog outputs AES EBU balanced 4 2V R M S into 600 ohms AES EBU balanced 4 5V R M S into 100Kohms AES EBU unbalanced 2V R M S into 600 ohms A...

Страница 15: ...diction LIMITS AND EXCLUSIONS LAVRY ENGINEERING DOES NOT BY VIRTUE OF THIS AGREEMENT OR BY ANY COURSE OF PERFORMANCE COURSE OF DEALING OR USAGE OF TRADE MAKE ANY OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE TITLE OR NONINFRINGEMENT AND ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED LAVRY ENGINEERING EXPRESSLY...

Отзывы:

Нет отзывов