參數(shù)資料
型號(hào)： LMX2377UTMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： XO, clock
英文描述： PLLatinum⑩ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
封裝： PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 28/44頁(yè)
文件大小： 3181K
代理商： LMX2377UTMX
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
buffer sensitivity
level. The same setup is used for the LMX2370TMEB/
LMX2370SLEEB Evaluation Boards. This setup is similar to
the f
sensitivity setup except that the signal generator is
now connected to the OSC
pin and both f
pins are tied to
V
. The 51
shunt resistor matches the OSC
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
o
LD pin by
selecting the
Main PLL R Divider Output
word (F
LD Word
= 2 or 10) or the
Aux PLL R Divider Output
word (F
LD
Word = 1 or 9) in Code Loader. Similarly, a Universal
Counter is connected to the F
LD 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 OSC
in
/ Aux R_CNTR.
Again, V
is swept from 2.7V to 5.5V. The MICROWIRE
power supply, Vμc, is tied to V
. The OSC
input frequency
and voltage level are then swept with the signal generator.
The measurements are repeated at different temperatures,
namely T
= -40C, +25C, and +85C. Sensitivity is reached
when the frequency error of the divided input signal is
greater than or equal to 1 Hz.
L
www.national.com
28
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