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参数资料
| 型号： | LMX2377UTMX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 21/44页 |
| 文件大小： | 3181K |
| 代理商： | LMX2377UTMX/NOPB |
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Test Setups (Continued)
LMX2377U OSC
in Sensitivity Test Setup
20022641
The block diagram above illustrates the setup required to
measure the LMX2377U device’s OSC
in buffer sensitivity
level. The same setup is used for the LMX2370TMEB/
LMX2370SLEEB Evaluation Boards. This setup is similar to
the f
IN sensitivity setup except that the signal generator is
now connected to the OSC
in pin and both fIN pins are tied to
V
CC. The 51
shunt resistor matches the OSC
in input to the
signal generator. The R counter is typically set to 1000, i.e.
Main R_CNTR Word = 1000 or Aux R_CNTR Word = 1000.
The reference divider output is routed to the F
oLD pin by
selecting the Main PLL R Divider Output word (F
oLD Word
= 2 or 10) or the Aux PLL R Divider Output word (F
oLD
Word = 1 or 9) in Code Loader. Similarly, a Universal
Counter is connected to the F
oLD pin and is tied to the 10
MHz reference output from the signal generator. The output
of the reference divider is monitored and should be equal to
OSC
in/ Main R_CNTR or OSCin/ Aux R_CNTR.
Again, V
CC is swept from 2.7V to 5.5V. The MICROWIRE
power supply, Vc, is tied to V
cc. The OSCin input frequency
and voltage level are then swept with the signal generator.
The measurements are repeated at different temperatures,
namely T
A = -40C, +25C, and +85C. Sensitivity is reached
when the frequency error of the divided input signal is
greater than or equal to 1 Hz.
LMX2377U
www.national.com
28
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