Datasheet

DP83640
SNOSAY8E –SEPTEMBER 2007–REVISED APRIL 2013 www.ti.com
Table 9-1. 25 MHz Oscillator Specification
Parameter Min Typ Max Units 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 verified by production testing. Refer to AN-1548, “PHYTER 100
Base-TX Reference Clock Jitter Tolerance”(SNLA091) for details on jitter performance.
Table 9-2. 50 MHz Oscillator Specification
Parameter Min Typ Max Units 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
(1) This limit is provided as a guideline for component selection and not verified by production testing. Refer to AN-1548, “PHYTER 100
Base-TX Reference Clock Jitter Tolerance”(SNLA091) for details on jitter performance.
Table 9-3. 25 MHz Crystal Specification
Parameter Min Typ Max Units Condition
Frequency 25 MHz
Frequency Tolerance ±50 ppm Operational Temperature
Frequency Stability ±50 ppm 1 year aging
Shunt Capacitance 25 40 pF Range of C
L1
and C
L2
74 Design Guidelines Copyright © 2007–2013, Texas Instruments Incorporated
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