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参数资料
| 型号： | SY89537LMHTR |
| 厂商： | MICREL INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 756 MHz, OTHER CLOCK GENERATOR, QCC44 |
| 封装： | 7 X 7 MM, LEAD FREE, MO-220, MLF-44 |
| 文件页数： | 3/19页 |
| 文件大小： | 819K |
| 代理商： | SY89537LMHTR |
Micrel, Inc.
SY89537L
July 2005
M9999-072105
hbwhelp@micrel.com or (408) 955-1690
11
Figure 3b. Loop Filter for Lowest Total Jitter and Best
Reference Spur Reduction
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
Min.
Typ.
Max.
Unit
Frequency Tolerance @25°C
±30
±50
ppm
Frequency Stability over 0*C
to 70°C
±50
±100
ppm
Operating Temperature Range
–20
+70
°C
Storage Temperature Range
–55
+125
°C
Aging (per yr/1
st 3yrs)
±5
ppm
Equivalent Series Resistance
(ESR)
50
Drive Level
100
W
Table 4. Quartz Crystal Oscillator Specifications
Figure 4a. Reference Spur at -39dB at 16MHz
(R = 130, C1 = 0.47F, C2 = 100pF)
Figure 4b. Reference Spur at -52dB at 16MHz
(R = 130, C1 = 0.47F, C2 = 1000pF)
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.
Figure 5. SY89537L Recommended
Power Supply De-Coupling
Note:
For VCCA and VCCD use ferrite bead, Murata P/N BLM21A1025.
For VCCO use ferrite bead, Murata, P/N BLM31P005.
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