LMX2430 National Semiconductor Corporation, LMX2430 Datasheet - Page 9

• Manufacturer Part Number: LMX2430
• Description: Pllatinum Dual High Frequency Synthesizer For Rf Personal Communications
• Manufacturer: National Semiconductor Corporation

PHASE NOISE CHARACTERISTICS
L
L
L
NRF
NIF
RF
Electrical Characteristics
Vcc = EN = 2.5V, −40˚C ≤ T
Note 4: Some of the values in this range are illegal divide ratios (B
≥ P
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
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
detector comparison frequency.
Note 11: The synthesizer phase noise is measured with the LMX2430TM/LMX2430SLE Evaluation boards and the HP8566B Spectrum Analyzer.
Symbol
(f)
(f)
(f)
*
(P−1), where P is the value of the prescaler selected.
RF Synthesizer Normalized Phase
Noise Contribution
(Note 10)
IF Synthesizer Normalized Phase
Noise Contribution
(Note 10)
RF Synthesizer Single
Side Band Phase
Noise Measured
Parameter
A
≤ +85˚C, unless otherwise specified
LMX2430
LMX2433
LMX2434
(Continued)
N
(f) = L(f) − 20 log (N) − 10 log (f
TCXO Reference Source
RF_CPG Bit = 1
IF_PD Bit = 1
TCXO Reference Source
IF_CPG Bit = 1
RF_PD Bit = 1
f
f = 10 kHz offset
f
Loop Bandwidth = 100 kHz
N
f
v
RF_CPG Bit = 1
IF_PD Bit = 1
T
(Note 11)
f
f = 10 kHz offset
f
Loop Bandwidth = 100 kHz
N
f
v
RF_CPG Bit = 1
IF_PD Bit = 1
T
(Note 11)
f
f = 10 kHz offset
f
Loop Bandwidth = 100 kHz
N
f
v
RF_CPG Bit = 1
IF_PD Bit = 1
T
(Note 11)
FinRF
COMPRF
OSCin
FinRF
COMPRF
OSCin
FinRF
COMPRF
OSCin
<
OSCin
OSCin
OSCin
A
A
A
RF
RF
RF
A). To obtain continuous legal division, the Minimum Divide Ratio must be calculated. Use N
= +25
= +25
= +25
= 2750
= 3200
= 4700
= 2750 MHz
= 3200 MHz
= 4700 MHz
= 10 MHz
= 10 MHz
= 10 MHz
= 1 V
= 1 V
= 1 V
= 1 MHz
= 1 MHz
= 1 MHz
o
o
o
C
C
C
9
Conditions
PP
PP
PP
COMP
), where L(f) is defined as the single side band phase noise
Min
COMP
-219.0
-214.0
-90.30
-88.90
-85.60
Value
is the RF/IF phase/ frequency
Typ
Max
www.national.com
Units
dBc/
dBc/
dBc/
dBc/
dBc/
Hz
Hz
Hz
Hz
Hz