LMX2377UTM datasheet(11/44 Pages) NSC

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Electrical Characteristics (Continued)

V

CC =VP Main = VP Aux = Vµc = 3.0V, −40˚C

≤ T

A

≤ +85˚C, unless otherwise specified

Symbol

Parameter

Conditions

Value

Units

Min

Typ

Max

PHASE NOISE CHARACTERISTICS

L

N(f) Main

Main Synthesizer Normalized Phase

Noise Contribution

(Note 10)

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 = 25˚C

(Note 11)

-77.24

dBc/

Hz

L

N(f) Aux

Aux Synthesizer Normalized Phase

Noise Contribution

(Note 10)

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 = 25˚C

(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 * (P−1), 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.

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