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参数资料
| 型号： | LMX2377UTMX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 3/44页 |
| 文件大小： | 3181K |
| 代理商： | LMX2377UTMX/NOPB |
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Electrical Characteristics (Continued)
V
CC =VP Main = VP Aux = Vc = 3.0V, 40C
≤ T
A
≤ +85C, unless otherwise specified
Symbol
Parameter
Conditions
Value
Units
Min
Typ
Max
PHASE NOISE CHARACTERISTICS
L
N(f) Main
Main Synthesizer Normalized Phase
Noise Contribution
TCXO Reference Source
ID
o Main Bit = 1
-212.0
dBc/
Hz
L(f) Main
Main Synthesizer Single Side Band
Phase Noise Measured
f
IN Main = 2450 MHz
f = 1 kHz Offset
FφMain = 200 kHz
Loop Bandwidth = 7.5 kHz
N = 12250
F
OSC =10MHz
V
OSC = 0.632 VPP
ID
o Main Bit = 1
PWDN Aux Bit = 1
T
A = 25C
-77.24
dBc/
Hz
L
N(f) Aux
Aux Synthesizer Normalized Phase
Noise Contribution
TCXO Reference Source
ID
o Aux Bit = 1
-212.0
dBc/
Hz
L(f) Aux
Aux Synthesizer Single Side Band
Phase Noise Measured
f
IN Aux = 900 MHz
f = 1 kHz Offset
FφAux = 200 kHz
Loop Bandwidth = 12 kHz
N = 4500
F
OSC =10MHz
V
OSC = 0.632 VPP
ID
o Aux Bit = 1
PWDN Main Bit = 1
T
A = 25C
-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 fIN 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 OSCin Sensitivity Test Setup section
Note 9: Refer to the LMX2377U Serial Data Input Timing section
Note 10: Normalized Phase Noise Contribution is defined as : LN(f) = L(f) 20 log (N) 10 log (Fφ), where L(f) is defined as the single side band phase noise
measured at an offset frequency, f, ina1Hz 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 Fφ 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.
LMX2377U
www.national.com
11
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