DP83848-HT Datasheet, PDF (68/81 Pages) Texas Instruments – PHYTER Military Temperature Single Port 10/100 MB/S Ethernet Physical Layer Transceiver

DP83848-HT
SLLSEJ7 – FEBRUARY 2015
www.ti.com
X1
X2
R₁
C_L1
C_L2
Figure 42. Crystal Oscillator Circuit
Table 61. 25-MHz Oscillator Specification
PARAMETER
Frequency
Frequency tolerance
Frequency stability
Rise/Fall time
Jitter
Jitter
Symmetry
CONDITIONS
Operational temperature
1 year aging
20% to 80%
Short term
Long term
Duty cycle
MIN
40%
TYP
25
MAX
±50
±50
6
800 ⁽¹⁾
800 ⁽¹⁾
60%
UNIT
MHz
ppm
ppm
ns
ps
ps
(1) This limit is provided as a guideline for component selection and to ensure by production testing. Refer to AN-1548, PHYTER™ 100
Base-TX Reference Clock Jitter Tolerance, SNLA091 for details on jitter performance.
Table 62. 50 MHz Oscillator Specification
PARAMETER
Frequency
Frequency tolerance
Frequency stability
Rise/Fall time
Jitter
Jitter
Symmetry
CONDITIONS
Operational temperature
Operational temperature
20% - 80%
Short term
Long term
Duty cycle
MIN
40%
TYP
50
MAX
±50
±50
6
800 ⁽¹⁾
800 ⁽¹⁾
60%
UNIT
MHz
ppm
ppm
ns
ps
ps
(1) This limit is provided as a guideline for component selection and to guaranteed by production testing. Refer to AN-1548, “PHYTER 100
Base-TX Reference Clock Jitter Tolerance,“ for details on jitter performance.
PARAMETER
Frequency
Frequency tolerance
Frequency stability
Load capacitance
Table 63. 25 MHz Crystal Specification
CONDITIONS
Operational temperature
1 year aging
MIN
TYP
25
25
MAX
±50
±50
40
UNIT
MHz
ppm
ppm
pF
9.2.2.3 Power Feedback Circuit
To ensure correct operation for the DP83848, parallel caps with values of 10 μF (Tantalum) and 0.1 μF should
be placed close to pin 23 (PFBOUT) of the device.
Pin 18 (PFBIN1) and pin 37 (PFBIN2) must be connected to pin 23 (PFBOUT), each pin requires a small
capacitor (.1 μF). See Figure 43 for proper connections.
68
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