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AN303 Datasheet(PDF) 1 Page - Silicon Laboratories |
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AN303 Datasheet(HTML) 1 Page - Silicon Laboratories |
1 / 4 page Rev. 0.1 7/06 Copyright © 2006 by Silicon Laboratories AN303 AN303 Si55X VCXO TEMPERATURE STABILITY DEFINITION 1. Introduction The Si55x VCXO utilizes a unique architecture to provide VCXO functionality and performance in an industry standard 5x7 mm CLCC package. This unique architecture provides nearly any clock frequency from 10 MHz to 1.4 GHz and voltage control for closed-loop applications (phase-locked loops). The basis for frequency synthesis is a single-frequency bulk-acoustic wave (BAW) AT-cut crystal resonator that offers tight frequency stability over temperature and well understood aging behavior. A CMOS IC based on Silicon Labs’ proprietary DSPLL™ technology provides the frequency translation from the crystal to the desired output frequency. Voltage control is achieved via a ground-referenced analog-to-digital converter (VCADC) that dynamically adjusts the frequency synthesis. 2. Temperature Effects Both traditional VCXOs and Si55x VCXOs have specifications that are dependent on temperature. Temperature affects two areas of VCXOs: the crystal’s absolute frequency across temperature and the control voltage circuitry’s response to temperature. 2.1. Crystal Temperature Behavior BAW AT-cut crystals have absolute frequency that is dependent on the cut angle and the temperature as shown in Figure 1. SAW oscillators have a different behavior. The Si55x VCXO data sheet specifies this parameter as “temperature stability” indicating the base oscillator’s frequency stability across temperature. The specification is given as a symmetric minimum and maximum. Figure 1. Relative Frequency Across Temperature for AT-Cut Bulk-Acoustic-Wave Crystal r m R R R R r m Y Z AT-cut BT-cut 49 o 35¼ o -1 0 ’ 1 ’ 2 ’ 3 ’ 4 ’ 5 ’ 6 ’ 7 ’ 8 ’ -1 ’ 0 ’ 1 ’ 2 ’ 3 ’ 4 ’ 5 ’ 6 ’ 7 ’ 8 ’ Y- bar quartz Z 25 20 15 10 5 0 -5 -10 -15 -20 -25 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 f/f) ppm Temperature ( oC) |
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