參數(shù)資料
型號(hào): LMX2330ATMX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: PLL合成/DDS/VCOs
英文描述: PHASE LOCKED LOOP, 2500 MHz, PDSO20
封裝: 0.173 INCH, PLASTIC, TSSOP-20
文件頁(yè)數(shù): 6/17頁(yè)
文件大小: 392K
代理商: LMX2330ATMX
Typical Application Example
DS012331-19
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 values are 10 to
200
depending on the VCO power level. f
IN RF impedance ranges from 40 to 100.fIN 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 recom-
mended 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.
DS012331-20
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.
www.national.com
14
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