45.1584 MHZ DVC-1 MASTER CLOCK 

45.1584 Mhz DVC-1 Master Clock

Product Code: DVC1_45 Price: Check Latest DVC-1 Master Clock Introduction The Main source of jitter in a CD system is the oscillator circuit. Almost all oscillator circuits in CD players are of poor quality, having high "phase noise" (the same thing as jitter), poor power supply and stability. Phase noise is caused by the oscillator not being correctly tuned to a single frequency, but wandering in frequency over short duration's. As an example, if the CD sample frequency of 44.1KHz is derived from a clock frequency of 16.934400MHz, the clock could drift up or down in frequency, 16.93425MHz (to low) - 16.93465MHz (to high) thereby causing phase noise. To maintain low jitter, or phase noise, the clock frequency should remain stable versus temperature. Another important factor is power supply noise which can be caused by several factors. Since most clock circuits are connected to the main digital supply (usually a 7812/7815 voltage regulator) they have to contend with a large amount of power supply modulation noise. This noise is caused by the switching of the digital filter, D-A converter. microprocessor, digital display, servos, & motor. These produce switching spikes which affect the clock by masking low level information. DVC-1 is a fast, precision timing circuit for your CD player to reference to. A TCXO (Temperature Controlled Oscillator) is used having very low short term frequency variation (low phase noise), providing a stable, 5ppm clock accuracy. An ultra-high speed, ultra-low noise discrete regulator is used for the oscillator section, and a second discrete regulator feeds the buffer stage. Independent regulation prevents interaction between stages, producing a cleaner clock output. The circuit layout of the board has been optimised with short signal paths, and a high density ground plane to reduce digital noise and extraneous signal radiation. Careful attention has been made to de-coupling with high grade electrolytics used (paralleled by an array of 100Nf + 1Nf SMD capacitors to preserve low impedance at high frequencies) Summary DVC-1 enables the decoding and reconstruction of data from a CD to be a much more accurate process. By extracting more information and preserving the data on the disc, the music is a more believable experience, and brings you closer to the original performance. The sonic benefits of DVC-1 are as follows:- Technical Features 5ppm clock accuracy Improved sampling accuracy and subsequent reduction data related jitter. Fast 2ns rise time Separate, 2-stage ultra-low noise discrete regulators for oscillator and buffer High Grade Black Gate BG-NX and BG-PK series capacitors. Hand selected ultra-low noise semiconductors. CD/DVD Audio Replay Dramatically improved sound stage with 3-D spacious imaging. Natural rendition of vocals and instruments. Reduction of tonal glare and midrange hardness. Reduced congestion of complex passages of music. Accurate extended bass with greater definition and improved timing. Extended dynamic range and improved detail. DVD Picture Quality More 'brilliant' picture contrasts. Improved sharpness and greater definition of colours. Reduction of picture grain. © 1998 - 2002 Audiocom Reviews Soundstage Magazine by Doug Blackburn Input Voltages: +9v to +24v Dimensions (L x W x H): 2 1/4” x 1 3/8” x 5/8”