參數(shù)資料
型號: LMX2377UTMX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 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
文件頁數(shù): 11/44頁
文件大?。?/td> 3181K
代理商: LMX2377UTMX
Electrical Characteristics
(Continued)
V
CC
= V
P
Main = V
P
Aux = Vμc = 3.0V, 40C
T
A
+85C, unless otherwise specified
Symbol
Parameter
Conditions
Value
Typ
Units
Min
Max
PHASE NOISE CHARACTERISTICS
L
N
(f) Main
Main Synthesizer Normalized Phase
Noise Contribution
(Note 10)
L(f) Main
Main Synthesizer Single Side Band
Phase Noise Measured
TCXO Reference Source
ID
o
Main Bit = 1
-212.0
dBc/
Hz
f
IN
Main = 2450 MHz
f = 1 kHz Offset
F
φ
Main
= 200 kHz
Loop Bandwidth = 7.5 kHz
N = 12250
F
OSC
= 10 MHz
V
OSC
= 0.632 V
PP
ID
o
Main Bit = 1
PWDN Aux Bit = 1
T
A
= 25C
(Note 11)
TCXO Reference Source
ID
o
Aux Bit = 1
-77.24
dBc/
Hz
L
N
(f) Aux
Aux Synthesizer Normalized Phase
Noise Contribution
(Note 10)
Aux Synthesizer Single Side Band
Phase Noise Measured
-212.0
dBc/
Hz
L(f) Aux
f
IN
Aux = 900 MHz
f = 1 kHz Offset
F
φ
Aux
= 200 kHz
Loop Bandwidth = 12 kHz
N = 4500
F
OSC
= 10 MHz
V
OSC
= 0.632 V
PP
ID
o
Aux Bit = 1
PWDN Main Bit = 1
T
A
= 25C
(Note 11)
-85.94
dBc/
Hz
Note 4:
Some of the values in this range are illegal divide ratios (B
<
A). To obtain continuous legal division, the Minimum Divide Ratio must be calculated. Use N
P
*
(P1), where P is the value of the prescaler selected.
Note 5:
Refer to the LMX2377U f
IN
Sensitivity Test Setup section
Note 6:
Refer to the LMX2377U Charge Pump Test Setup section
Note 7:
Refer to the Charge Pump Current Specification Definitions for details on how these measurements are made.
Note 8:
Refer to the LMX2377U OSC
in
Sensitivity Test Setup section
Note 9:
Refer to the LMX2377U Serial Data Input Timing section
Note 10:
Normalized Phase Noise Contribution is defined as : L
N
(f) = L(f) 20 log (N) 10 log (F
φ
), where L(f) is defined as the single side band phase noise
measured at an offset frequency, f, in a 1 Hz bandwidth. The offset frequency, f, must be chosen sufficiently smaller than the PLL’s loop bandwidth, yet large enough
to avoid substantial phase noise contribution from the reference source. N is the value selected for the feedback divider and F
φ
is the Main/Aux phase detector
comparison frequency..
Note 11:
The synthesizer phase noise is measured with the LMX2370TMEB/LMX2370SLBEB/LMX2370SLEEB Evaluation boards and the HP8566B Spectrum
Analyzer.
L
www.national.com
11
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