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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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V62/12615-01XE-R датащи(PDF) 77 Page - Texas Instruments |
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V62/12615-01XE-R датащи(HTML) 77 Page - Texas Instruments |
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77 / 98 page  77 DP83848-EP www.ti.com SLLSEC6E – SEPTEMBER 2012 – REVISED JUNE 2019 Submit Documentation Feedback Product Folder Links: DP83848-EP Application and Implementation Copyright © 2012–2019, Texas Instruments Incorporated (1) This limit is provided as a guideline for component selection and not specified by production testing. Refer to SNLA091, PHYTER 100 Base-TX Reference Clock Jitter Tolerance, for details on jitter performance. Figure 6-3. Crystal Oscillator Circuit Table 6-1. 25-MHz Oscillator Specification PARAMETER MIN TYP MAX UNIT CONDITION Frequency 25 MHz Frequency Tolerance ±50 ppm Operational Temperature Frequency Stability ±50 ppm 1 year aging Rise / Fall Time 6 nsec 20% - 80% Jitter 800(1) psec Short term Jitter 800(1) psec Long term Symmetry 40% 60% Duty Cycle (1) This limit is provided as a guideline for component selection and not specified by production testing. Refer to SNLA091, PHYTER 100 Base-TX Reference Clock Jitter Tolerance, for details on jitter performance. Table 6-2. 50-MHz Oscillator Specification PARAMETER MIN TYP MAX UNIT CONDITION Frequency 50 MHz Frequency Tolerance ±50 ppm Operational Temperature Frequency Stability ±50 ppm Operational Temperature Rise / Fall Time 6 nsec 20% - 80% Jitter 800(1) psec Short term Jitter 800(1) psec Long term Symmetry 40% 60% Duty Cycle Table 6-3. 25-MHz Crystal Specification PARAMETER MIN TYP MAX UNIT CONDITION Frequency 25 MHz Frequency Tolerance ±50 ppm Operational Temperature Frequency Stability ±50 ppm 1 year aging Load Capacitance 25 40 pF 6.2.1.3 Power Feedback Circuit To ensure correct operation for the DP83848-EP, parallel caps with values of 10 µF and 0.1 µF should be placed close to pin 23 (PFBOUT) of the device. Pin 18 (PFBIN1), pin 37 (PFBIN2), pin 23 (PFBIN3) and pin 54 (PFBIN4) must be connected to pin 31 (PFBOUT), each pin requires a small capacitor (0.1 µF). See Figure 6-4 below for proper connections. |
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