參數(shù)資料
型號(hào): LMX2370TMX/NOPB
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: PLL合成/DDS/VCOs
英文描述: PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
封裝: PLASTIC, TSSOP-20
文件頁數(shù): 13/25頁
文件大?。?/td> 577K
代理商: LMX2370TMX/NOPB
Typical Application Example
10102636
Operational Notes:
*
VCO is assumed AC coupled.
**
R
IN increases impedance so that VCO output power is
provided to the load rather than the PLL. Typical val-
ues are 10
to 200 depending on the VCO power
level. f
IN RF impedance ranges from 40
to 100.f
IN
IF impedances are higher.
***
50
termination is often used on test boards to allow
use of external reference oscillator. For most typical
products a CMOS clock is used and no terminating
resistor is required. OSC
in may be AC or DC coupled.
AC coupling is recommended because the input circuit
provides its own bias. (See Figure below)
**** Adding RC filters to the V
CC line is recommended to
reduce loop-to-loop noise coupling.
10102637
Proper use of grounds and bypass capacitors is essential to achieve a
high level of performance. Crosstalk between pins can be reduced by
careful board layout.
This is an electrostatic sensitive device. It should be handled only at static
free work stations.
LMX2370
www.national.com
20
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