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Operating Manual
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Summary of Contents for Lavry DA2002
- Page 1 LAVRY ENGINEERING Model DA2002 High Resolution Digital to Analog Converter Operations Manual Lavry Engineering, Inc. 945 Hildebrand Lane NE Suite 110 Bainbridge Island, WA 98110 (206) 842-3552 http://lavryengineering.com Revision 1.5...
- Page 2 DA2002 Operations Manual...
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Page 3: Limited Warranty
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. -
Page 4: Table Of Contents
DA2002 Operations Manual Table of Contents Limited Warranty..................2 Introduction....................4 PART I Operating Instructions.................5 Input signal selection ..................5 Input signal connection ................5 Analog Outputs....................6 Analog Output Level ..................6 Turn-On sequence..................7 Polarity inversion ..................7 CrystalLock™ and Wide lock..............7 Part II Theory of operation..................8 Oven control....................8... -
Page 5: Introduction
A quad switch deglitcher circuit removes the unwanted transition glitch energy. The DA2002 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 the memory to the DAC disregarding any jitter in the input frequency. -
Page 6: Operating Instructions
Holding the INPUT SELECT button for more then a second makes the DA2002 go into search mode: the unit will step through the inputs but will skip the inactive input connectors (where no signal is present). -
Page 7: Analog Outputs
Operations Manual DA2002 Analog Outputs The LEFT OUTPUT and RIGHT OUTPUT XLR signals are factory set to provide Balanced analog signals (signal between pin 2 and pin 3 of the XLR connectors). Operation in unbalanced mode (signal at pin 2 and ground at pin 3) is possible by changing the internal jumpers J8 and J10 located behind the XLR analog output connectors inside the case. -
Page 8: Turn-On Sequence
The unit deals with the turn on spike by incorporating very slow tracking power supplies for its output stage, thus disabling the drive capability during turn on. The DA2002 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. -
Page 9: Theory Of Operation
Operations Manual DA2002 Part II: Theory of operation The simplified block diagram (figure 1) shows the basic building blocks. Oven control The PCM DAC is constructed of custom made laser trimmed thin film resistor networks; yet any resistor is subject to short term drift due to temperature variations and long term drift due to component aging. The resistor networks are kept at a constant temperature by a linearly controlled heating element. -
Page 10: Timing And Deglitcher
Calibrating a DA2002 for the first time (at the factory) often exceeds 25 minutes. Once calibrated, the settings are stored in non volatile ram for future startup point of reference, thus all future adjustments are initialized to the last settings. -
Page 11: Output Filter And Drivers
Power and Fusing The Model DA2002 operates at 50 or 60 Hz, and has two line voltage selections, 115 volts and 220 volts, switchable on the back panel. 115 volts operation requires a 1/2 ampere 250 volt fast blow fuse; 220 volt operation requires 1/4 ampere 250 volt fast blow fuse. -
Page 12: Part Iii Specifications
DA2002 Operations Manual Part III: Specifications Noise -110dBFS rms, 130dBFS peak spurious response Distortion 1kHz tone at -1dBFS: .0009%FS peak harmonic amplitude 1kHz tone at -60dBFS: .00009%FS peak harmonic amplitude 10kHz tone at -1dBFS: .0009%FS peak harmonic amplitude 10kHz tone at -60dBFS: .00009%FS peak harmonic amplitude Sample rate 96kHx, 88.1kHz, 48kHz, 44.1kHz at +/- 150ppm lock range...