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LAN89730 데이터시트(PDF) 207 Page - Microchip Technology

부품명 LAN89730
상세설명  Implements Reduced Power Operating Modes
PDF  218 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN89730 데이터시트(HTML) 207 Page - Microchip Technology

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 2013-2015 Microchip Technology Inc.
DS60001348A-page 207
LAN89730
7.7.2
100 µW 25 MHZ CRYSTAL SPECIFICATIONS
When utilizing a 100 µW 25 MHz crystal, the following circuit design (Figure 7-10) and specifications (Table 7-23) are
required to ensure proper operation.
Note 7-14
The maximum allowable values for frequency tolerance and frequency stability are application
dependent. Since any particular application must meet the IEEE +/-50 PPM Total PPM Budget, the
combination of these two values must be approximately +/-45 PPM (allowing for aging).
Note 7-15
Frequency Deviation Over Time is also referred to as Aging.
Note 7-16
The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as +/-50 PPM.
Note 7-17
This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in
this value. The XO/XI pin and PCB capacitance values are required to accurately calculate the value
of the two external load capacitors. These two external load capacitors determine the accuracy of the
25.000 MHz frequency.
FIGURE 7-10:
100 µW 25 MHZ CRYSTAL CIRCUIT
TABLE 7-23:
100 µW CRYSTAL SPECIFICATIONS
Parameter
Symbol
Min.
Nom.
Max.
Unit
Note
Crystal Cut
AT, typ
Crystal Oscillation Mode
Fundamental Mode
Crystal Calibration Mode
Parallel Resonant Mode
Frequency
Ffund
-
25.000
-
MHz
Frequency Tolerance @ 25oCFtol
-
-
+/-50
PPM
Note 7-14
Frequency Stability Over Temp
Ftemp
-
-
+/-50
PPM
Note 7-14
Frequency Deviation Over Time
Fage
-
+/-3 to 5
-
PPM
Note 7-15
Total Allowable PPM Budget
-
-
+/-50
PPM
Note 7-16
Shunt Capacitance
CO
--
5
pF
Load Capacitance
CL
8
-
12
pF
Drive Level
PW
-
100
µW
Equivalent Series Resistance
R1
-
-
80
Ohm
XO Series Resistor
RS
495
500
505
Ohm
Operating Temperature Range
-40
-
+105
oC
XI Pin Capacitance
-
3 typ
-
pF
Note 7-17
XO Pin Capacitance
-
3 typ
-
pF
Note 7-17
LAN89730
XO
XI
RS
Y1
C1
C2



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