MAX3625 Просмотр технического описания (PDF) - Maxim Integrated
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MAX3625 Datasheet PDF : 10 Pages
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Low-Jitter, Precision Clock Generator
with Three Outputs
Table 1. Output Frequency Determination Chart
CRYSTAL OR
CMOS INPUT
FREQUENCY
(MHz)
25
25.78125
26.04166
26.5625
FEEDBACK
DIVIDER, M
25
25
24
24
VCO
FREQUENCY
(MHz)
625
644.53125
625
637.5
OUTPUT
DIVIDER,
NA AND NB
2
4
5
4
2
4
5
2
4
OUTPUT
FREQUENCY
(MHz)
312.5
156.25
125
161.132812
312.5
156.25
125
318.75
159.375
APPLICATIONS
Ethernet
10Gbps Ethernet
Ethernet
10G Fibre Channel
Table 2. Output Divider Configuration Chart
INPUT
SELA1/SELB1
SELA0/SELB0
0
0
0
1
1
0
1
1
NA/NB DIVIDER
/ 1*
/ 2*
/4
/5
*Maximum guaranteed output frequency is 320MHz.
Table 3. PLL Divider Configuration Chart
FB_SEL INPUT
0
1
M DIVIDER
/ 25
/ 24
Table 4. Crystal Selection Parameters
PARAMETER SYMBOL MIN
Crystal Oscillation
fOSC 24.8
Shunt Capacitance
CO
Load Capacitance
CL
Equivalent Series
Resistance (ESR)
RS
TYP
2.0
18
MAX
27
7.0
UNITS
MHz
pF
pF
50
Ω
Maximum Crystal
Drive Level
300 µW
Figure 2. Crystal Layout
27pF
CRYSTAL
(CL = 18pF)
33pF
X_IN
X_OUT
Figure 3. Crystal, Capacitors Connection
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