參數(shù)資料
型號: LMX2430
廠商: National Semiconductor Corporation
英文描述: PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
中文描述: PLLatinum雙高頻率合成射頻個人通信
文件頁數(shù): 9/49頁
文件大?。?/td> 943K
代理商: LMX2430
Electrical Characteristics
(Continued)
Vcc = EN = 2.5V, 40C
T
A
+85C, unless otherwise specified
Symbol
Parameter
Conditions
Value
Typ
Units
Min
Max
PHASE NOISE CHARACTERISTICS
L
NRF
(f)
RF Synthesizer Normalized Phase
Noise Contribution
(Note 10)
L
NIF
(f)
IF Synthesizer Normalized Phase
Noise Contribution
(Note 10)
L
RF
(f)
RF Synthesizer Single
Side Band Phase
Noise Measured
TCXO Reference Source
RF_CPG Bit = 1
IF_PD Bit = 1
TCXO Reference Source
IF_CPG Bit = 1
RF_PD Bit = 1
f
FinRF
= 2750 MHz
f = 10 kHz offset
f
COMPRF
= 1 MHz
Loop Bandwidth = 100 kHz
N
RF
= 2750
f
OSCin
= 10 MHz
v
OSCin
= 1 V
PP
RF_CPG Bit = 1
IF_PD Bit = 1
T
A
= +25
o
C
(Note 11)
f
FinRF
= 3200 MHz
f = 10 kHz offset
f
COMPRF
= 1 MHz
Loop Bandwidth = 100 kHz
N
RF
= 3200
f
OSCin
= 10 MHz
v
OSCin
= 1 V
PP
RF_CPG Bit = 1
IF_PD Bit = 1
T
A
= +25
o
C
(Note 11)
f
FinRF
= 4700 MHz
f = 10 kHz offset
f
COMPRF
= 1 MHz
Loop Bandwidth = 100 kHz
N
RF
= 4700
f
OSCin
= 10 MHz
v
OSCin
= 1 V
PP
RF_CPG Bit = 1
IF_PD Bit = 1
T
A
= +25
o
C
(Note 11)
-219.0
dBc/
Hz
-214.0
dBc/
Hz
LMX2430
-90.30
dBc/
Hz
LMX2433
-88.90
dBc/
Hz
LMX2434
-85.60
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 LMX243x FinRF Sensitivity Test Setup section
Note 6:
Refer to the LMX243x 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 LMX243x OSCin Sensitivity Test Setup section
Note 9:
Refer to the LMX243x Serial Data Input Timing section
Note 10:
Normalized Phase Noise Contribution is defined as : L
(f) = L(f) 20 log (N) 10 log (f
), 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
COMP
is the RF/IF phase/ frequency
detector comparison frequency.
Note 11:
The synthesizer phase noise is measured with the LMX2430TM/LMX2430SLE Evaluation boards and the HP8566B Spectrum Analyzer.
L
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