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DA924

Operations Manual

2

Copyright ©1998  by Lavry Engineering, Inc.  

All rights reserved.

Acoustic Bit Correction® and 

Lavry Engineering

® are registered trademarks of 

Lavry

Engineering

, Inc.

CrystalLock™ is a trademark of 

Lavry Engineering

, Inc.

Internet: 

info@

lavryengineering

.com

http://

www.lavryengineering

.com/

LIMITED WARRANTY 
 

Subject to the conditions set forth below, for one year after the original purchase date of the 
product, Lavry Engineering will repair the product free of charge in the United States in the event 
of a defect in materials or workmanship.  

 
Lavry Engineering may exchange new or rebuilt parts for defective parts.  Please call the factory 
for an RMA number prior to shipment.  No product will be accepted for warranty service without 
a pre-issued RMA number.  
 
This warranty is extended only to an original purchaser of the product from Lavry Engineering, or 
an authorized reseller of Lavry Engineering. Products that are purchased from unauthorized 
resellers do not have any warranty coverage. A valid purchase receipt or other valid proof of 
purchase will be required before warranty service is provided.  This warranty only covers failures 
due to defects in materials or workmanship and does not cover damages which occur in shipment 
or failures resulting from accident, misuse, line power surges, mishandling, maintenance, 
alterations and modifications of the product, or service by an unauthorized service center or 
personnel.  Lavry Engineering reserves the right to deny warranty service to products that have 
been used in rental, service bureau, or similar businesses. 
 
This limited warranty gives you specific legal rights.  You may have others which vary from 
state/jurisdiction to state/jurisdiction. 
 
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 DISCLAIMS ANY IMPLIED INDEMNITIES.  LAVRY ENGINEERING 
SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, CONSEQUENTIAL, 
PUNITIVE, SPECIAL OR EXEMPLARY LOSSES OR DAMAGES, INCLUDING, WITHOUT 
LIMITATION, DAMAGES TO RECORDINGS, TAPES OR DISKS, DAMAGES FOR LOSS 
OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS 
INFORMATION, LOSS OF GOODWILL, COVER, OR OTHER PECUNIARY LOSS, 
ARISING OUT OF OR RELATING TO THE USE OF THE PRODUCT, OR ARISING FROM 
BREACH OF WARRANTY OR CONTRACT, NEGLIGENCE, OR ANY OTHER LEGAL 
THEORY, EVEN IF LAVRY ENGINEERING HAS BEEN ADVISED OF THE POSSIBILITY 
OF SUCH LOSSES OR DAMAGES.  ANY DAMAGES THAT LAVRY ENGINEERING IS 
REQUIRED TO PAY FOR ANY PURPOSE WHATSOEVER SHALL NOT EXCEED THE 
ORIGINAL COST PAID TO LAVRY ENGINEERING FOR THE APPLICABLE PRODUCT. 
BECAUSE SOME STATES/JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR 
LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE 
FOREGOING LIMITATION MAY NOT APPLY TO YOU.

 

Содержание DA924

Страница 1: ...on Digital to Analog Converter Operations Manual Lavry Engineering Inc 824 Post Avenue Seattle WA 98104 206 381 5891 http www lavryengineering com E Mail info lavryengineering com Revision 1 1 March 1998 E LAVRY ENGINEERING I I ...

Страница 2: ...r or personnel Lavry Engineering reserves the right to deny warranty service to products that have been used in rental service bureau or similar businesses This limited warranty gives you specific legal rights You may have others which vary from state jurisdiction to state jurisdiction LIMITS AND EXCLUSIONS LAVRY ENGINEERING DOES NOT BY VIRTUE OF THIS AGREEMENT OR BY ANY COURSE OF PERFORMANCE COUR...

Страница 3: ...Input signal connection 5 Analog Outputs 6 Analog Output Level Adjustment 6 Turn On sequence 7 Polarity inversion 7 CrystalLock and Wide lock 7 Part II Theory of operation 9 Oven control 9 Calibration 9 Timing and deglitcher 10 Jitter removal 11 Output filter and drivers 11 Power and Fusing 11 Maintenance 12 Part III Specifications 13 ...

Страница 4: ...rovides 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 The DA924 eliminates jitter in the incoming data stream by use of a DSP controlled pullable crystal oscillator and a short buffer memory for temporary storage of the incoming data The DSP transfers the data from...

Страница 5: ... the INPUT SELECT button for more then a second makes the DA924 go into search mode the unit will step through the inputs but will skip the inactive input connectors where no signal is present Holding the INPUT SELECT button for more than one second switches between manual input selection and the input search mode or visa versa The mode selected is retained when power is removed Input signal conne...

Страница 6: ... hooked for balanced output the full scale analog level can be adjusted between 12dBu to 22dBu When hooked for Unbalanced output the full scale analog level can be adjusted between 6dBu to 16dBu The IEC connector level is adjustable between 8dBu and 8dBu full scale signal The wide 0 10dB attenuation range relies on an internal pot When operating at minimum attenuation 22dBu balanced or 16dBu unbal...

Страница 7: ... on The DA924 turn on spike may be higher then that found in other DACs but the sound is not compromised The spike due to power off is comparable to that found in other DACs Polarity inversion The normal polarity is set to pin 3 hot To invert press the POLARITY switch Signal inversion is indicated by a lit INVERT lamp Inverting while in unbalanced operation impacts signal polarity on the IEC cente...

Страница 8: ...nnel uses of the DA924 may require varispeed for synchronization To enable wide lock press and hold the POLARITY button for 1 5 seconds To return to CrystalLock press and hold the POLARITY button again The unit indicates varispeed mode by blinking the appropriate status light periodically This mode setting is retained when power is removed ...

Страница 9: ...age 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 4000 times for the sake of averaging out any error due to amplifier noise At the end of ...

Страница 10: ...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 output filter The blocking requirement is very demanding because a transition of many volts between two adjacent sample values should feed forward less than a micro volt A single switch c...

Страница 11: ... 100ppm per second input rate step requires pre storage of about 5 words of data for 1 second D A stepping or an 50 word memory for 10 seconds of D A update rate Output filter and drivers The DA924 operates in low oversampling to allow for maximum settling time of the DAC circuits and to further reduce sensitivity to jitter The upsampling filter is calculated by the DSP The tradeoff in favor of lo...

Страница 12: ...DA924 Operations Manual 12 The front panel is gold plated 24 karat gold Use a soft cloth and plain water if necessary to clean finger prints ...

Страница 13: ...speed Crystal lock tracking 1ppm 15 seconds Channel separation 100dBFs at 1KHz Flatness response 05dB 10Hz 20KHz Phase linearity 2 degrees 10Hz 20 KHz Digital inputs two AES EBU 110 Ohm transformer isolated one Consumer 75 Ohm transformer isolated Analog outputs AES EBU balanced 22dBuFS into 600 ohms Max 12dBuFS Min AES EBU unbalanced 16dBuFS into 600 ohms Max 6dBuFS Min Consumer outputs 8 5dBuFS ...

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