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CDCE62005 Datasheet(PDF) 48 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 48 Page - Texas Instruments |
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48 / 85 page  CDCE62005 SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 www.ti.com Table 34. CDCE62005 Lock Detect Window DIGITAL LOCK DETECT BIT NAME → LOCKW(3) LOCKW(2) LOCKW(1) LOCKW(0) REGISTER.BIT → 5.25 5.24 5.23 5.22 LOCK DETECT WINDOW 0 0 0 0 1.5 ns 0 0 0 1 5.8 ns 0 0 1 0 15.1 ns 0 0 1 1 Reserved 0 1 0 0 3.4 ns 0 1 0 1 7.7 ns 0 1 1 0 17.0 sn 0 1 1 1 Reserved 1 0 0 0 5.4 ns 1 0 0 1 9.7 ns 1 0 1 0 19.0 ns 1 0 1 1 Reserved 1 1 0 0 15.0 ns 1 1 0 1 19.3 ns 1 1 1 0 28.6 ns 1 1 1 1 Reserved 8.3.7 Crystal Input Interference Fundamental mode is the recommended oscillation mode of operation for the input crystal and parallel resonance is the recommended type of circuit for the crystal. A crystal load capacitance refers to all capacitances in the oscillator feedback loop. It is equal to the amount of capacitance seen between the terminals of the crystal in the circuit. For parallel resonant mode circuits, the correct load capacitance is necessary to ensure the oscillation of the crystal within the expected parameters. The CDCE62005 implements an input crystal oscillator circuitry, known as the Colpitts oscillator, and requires one pad of the crystal to interface with the AUX IN pin; the other pad of the crystal is tied to ground. In this crystal interface, it is important to account for all sources of capacitance when calculating the correct value for the discrete capacitor component, CL, for a design. The CDCE62005 has been characterized with 10-pF parallel resonant crystals. The input crystal oscillator stage in the CDCE62005 is designed to oscillate at the correct frequency for all parallel resonant crystals with low-pull capability and rated with a load capacitance that is equal to the sum of the on-chip load capacitance at the AUX IN pin (10-pF), crystal stray capacitance, and board parasitic capacitance between the crystal and AUX IN pin. 48 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated Product Folder Links: CDCE62005 |
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