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PDF LMX2531LQ1742 Data sheet ( Hoja de datos )
| Número de pieza | LMX2531LQ1742 | |
| Descripción | Evaluation Board Operating Instructions | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LMX2531LQ1742
Evaluation Board Operating Instructions
National Semiconductor Corporation
Wireless Communications, RF Products Group
2900 Semiconductor Dr.
MS A2-600
Santa Clara, CA, 95052-8090
LMX2531LQ1742FPEB Rev 3.10.2006
1 page  
LMX2531LQ1742 EVALUATION BOARD OPERATING INSTRUCTIONS
Phase Noise with Narrow Loop Filter (Internal Divide by 2 Disabled)
The plots to the left show the true
phase noise capability of the
VCO. In order to take these plots,
a 20 Hz loop bandwidth was used
with the E5052 spectrum
analyzer. This is the most
accurate and state of the art
equipment.
At lower offsets, the
measurements are more accurate
because the impact of the PLL is
removed. At higher offsets, the
measurements are also more
accurate because the E5052
spectrum analyzer has a much
lower noise floor than the E4445A
spectrum analyzer. Even though
the E4445A has a noise
cancellation feature, it only
cancels out the thermal noise. It
does not cancel out the phase
noise of the LO inside the
E4445A.
5
5 Page 
LMX2531LQ1742 EVALUATION BOARD OPERATING INSTRUCTIONS
1
Vcc
D
C
B
2
POW ER
1
3
R1
Vcc 5
7
2
4
6
8
C1
3
R2 VccVCO
C2
R3 VccBUF
C3
R4 VccPLL
C4
Schematic
4
C6
OSCin
R6
Ftest/LD
C7 R7
5
R5 VccDIG
C5
R24
R17
VccDIG
C9
1
2
3
4
5
6
7
8
9
VccDIG
NC
GND
NC
NC
VregBUF
NC
DATA
CLK
R23
VccPLL
C18
VccPLL
VregPLL1
FLout
CPout
Vtune
VccBUF
Fout
GND
GND
27
26
25
24
23
22
21
20
19
VccBUF
C16
R20
C17
R19 R21
U1
R22
Fout
VccVCO
6
D
C
B
R16 R15
R14
R13
R12 R11 R10
R9
C8 R8
Vcc
TRIGGER
A
GND
FRAME
uW IRE
12
Notethat AnyComponent withDesignator 100 or Higher is ontheBottomSide of the Board
34
Title
Size
B
Date:
File:
5
LMX2531 Eval uation Board
Number
LMX2531SLBCBPCB
Revision
01-06-2006
6-Jan-2006
Sheet of
C:\Documentum\Checkout\LMX2531LQEBPDCraBw.dndBby.d: db Dan Chappel l
6
A
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LMX2531LQ1742.PDF ] | |
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