sy89537l Micrel Semiconductor, sy89537l Datasheet - Page 11

• Manufacturer Part Number: sy89537l
• Description: Sy89537l 3.3v Precision Lvpecl And Lvds Programmable Multiple Output Bank Clock Synthesizer And Fanout Buffer
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
The reference spur is located at the phase detector
frequency away from the carrier frequency. The
attenuation of the reference spur is a function of the
loop filter. Figure 4a shows the attenuation of the
reference spur with the loop filter shown in Figure 3a.
Figure 4b shows the attenuation of the reference spur
with the loop filter shown in Figure 3b.
Crystal Frequency: 14MHz to 18MHz
Mode of Oscillation: Fundamental
December 2007
Frequency Tolerance @25°C
Frequency Stability over 0*C
to 70°C
Operating Temperature Range
Storage Temperature Range
Aging (per yr/1
Equivalent Series Resistance
(ESR)
Drive Level
Figure 3b. Loop Filter for Lowest Total Jitter and Best
Table 4. Quartz Crystal Oscillator Specifications
Figure 4a. Reference Spur at -39dB at 16MHz
(R = 130Ω, C1 = 0.47µF, C2 = 100pF)
st
Reference Spur Reduction
3yrs)
Min.
–20
–55
Typ.
±30
±50
100
Max.
±100
+125
+70
±50
±5
50
Unit
ppm
ppm
ppm
µW
°C
°C
_
11
Power Supply Filtering Techniques
As with any high-speed integrated circuit, power
supply filtering is very important. At a minimum,
VCCA, VCCD, and all VCCO pins should be
individually connected using a via to the power supply
plane, and separate bypass capacitors should be
used for each pin. To achieve optimal jitter
performance, each power supply pin should use
separate instances of the circuit shown in Figure 5.
Note:
For V
For V
CCA
CCO
Figure 4b. Reference Spur at -52dB at 16MHz
and V
use ferrite bead, Murata, P/N BLM31P005.
(R = 130Ω, C1 = 0.47µF, C2 = 1000pF)
Figure 5. SY89537L Recommended
CCD
Power Supply De-Coupling
use ferrite bead, Murata P/N BLM21A1025.
[e-mail]
M9999-121207-B
or [phone]
SY89537L