LMX2331UEVAL National Semiconductor, LMX2331UEVAL Datasheet - Page 11

• Manufacturer Part Number: LMX2331UEVAL
• Manufacturer: National Semiconductor

Specifications of LMX2331UEVAL

• Lead Free Status / Rohs Status: Not Compliant

PHASE NOISE CHARACTERISTICS
L
L(f) IF
N
Electrical Characteristics
V
Note 4: Some of the values in this range are illegal divide ratios (B
≥ P
Note 5: Refer to the LMX233xU f
Note 6: Refer to the LMX233xU 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 LMX233xU OSC
Note 9: Refer to the LMX233xU 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
comparison frequency.
Note 11: The synthesizer phase noise is measured with the LMX2330TMEB/LMX2330SLBEB/LMX2330SLEEB Evaluation boards and the HP8566B Spectrum
Analyzer.
Symbol
(f) IF
CC
*
(P−1), where P is the value of the prescaler selected.
= V
P
RF = V
IF Synthesizer Normalized Phase
Noise Contribution
(Note 10)
IF Synthesizer Single
Side Band Phase
Noise Measured
P
IF = 3.0V, −40˚C ≤ T
Parameter
IN
Sensitivity Test Setup section
in
Sensitivity Test Setup section
LMX233xU
A
≤ +85˚C, unless otherwise specified
(Continued)
N
TCXO Reference Source
ID
f
f = 1 kHz Offset
F
Loop Bandwidth = 18 kHz
N = 1000
F
V
ID
PWDN RF Bit = 1
T
(Note 11)
(f) = L(f) − 20 log (N) − 10 log (F
IN
<
φIF
OSC
A
OSC
o
o
A). To obtain continuous legal division, the Minimum Divide Ratio must be calculated. Use N
IF = 200 MHz
= +25˚C
IF Bit = 1
IF Bit = 1
= 200 kHz
= 10 MHz
= 0.632 V
11
Conditions
PP
φ
), where L(f) is defined as the single side band phase noise
Min
-212.0
-99.00
Value
φ
Typ
is the RF/IF phase detector
Max
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Units
dBc/
dBc/
Hz
Hz