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DP83848JSQ/NOPB Datasheet(PDF) 66 Page - Texas Instruments |
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DP83848JSQ/NOPB Datasheet(HTML) 66 Page - Texas Instruments |
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66 / 84 page  X1 X2 C L2 C L1 R 1 DP83848H, DP83848J, DP83848K, DP83848M, DP83848T SNLS250E – MAY 2008 – REVISED APRIL 2015 www.ti.com Figure 7-3. Crystal Oscillator Circuit Table 7-1. 25-MHz Oscillator Specification PARAMETER CONDITION MIN TYP MAX UNIT Frequency 25 MHz Frequency Tolerance Operational Temperature 50 ppm Frequency Stability 1 year aging 50 ppm Rise / Fall Time 20%–80% 6 nsec Jitter Short term 800(1) psec Jitter Long term 800(1) psec Symmetry Duty Cycle 40% 60% (1) This limit is provided as a guideline for component selection and not guaranteed by production testing. Refer to SNLA076, PHYTER 100 Base-TX Reference Clock Jitter Tolerance, for details on jitter performance. Table 7-2. 50-MHz Oscillator Specification PARAMETER CONDITION MIN TYP MAX UNIT Frequency 50 MHz Frequency Tolerance Operational Temperature 50 ppm Frequency Stability 1 year aging 50 ppm Rise / Fall Time 20%–80% 6 nsec Jitter Short term 800(1) psec Jitter Long term 800(1) psec Symmetry Duty Cycle 40% 60% (1) This limit is provided as a guideline for component selection and not guaranteed by production testing. Refer to SNLA076, PHYTER 100 Base-TX Reference Clock Jitter Tolerance, for details on jitter performance. Table 7-3. 25-MHz Crystal Specification PARAMETER CONDITION MIN TYP MAX UNIT Frequency 25 MHz Frequency Tolerance Operational Temperature 50 ppm Frequency Stability 1 year aging 50 ppm Load Capacitance 25 40 pF 7.2.1.3 Power Feedback Circuit To ensure correct operation for the DP83848x, parallel caps with values of 10 µF (Tantalum) and 0.1 µF should be placed close to pin 19 (PFBOUT) of the device. Pin 16 (PFBIN1) and pin 30 (PFBIN2) must be connected to pin 19 (PFBOUT), each pin requires a small capacitor (0.1 µF). See Figure 7-4 for proper connections. 66 Application, Implementation, and Layout Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: DP83848H DP83848J DP83848K DP83848M DP83848T |
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