LMX2430 datasheet(9/49 Pages) NSC

9 / 49 page

Electrical Characteristics (Continued)

Vcc = EN = 2.5V, −40˚C

≤ T

≤ +85˚C, unless otherwise specified

Symbol

Parameter

Conditions

Value

Units

Min

Typ

Max

PHASE NOISE CHARACTERISTICS

NRF(f)

RF Synthesizer Normalized Phase

Noise Contribution

(Note 10)

TCXO Reference Source

RF_CPG Bit = 1

IF_PD Bit = 1

-219.0

dBc/

NIF(f)

IF Synthesizer Normalized Phase

Noise Contribution

(Note 10)

TCXO Reference Source

IF_CPG Bit = 1

RF_PD Bit = 1

-214.0

dBc/

RF(f)

RF Synthesizer Single

Side Band Phase

Noise Measured

LMX2430

FinRF = 2750 MHz

f = 10 kHz offset

COMPRF = 1 MHz

Loop Bandwidth = 100 kHz

RF = 2750

OSCin =10MHz

OSCin =1 VPP

RF_CPG Bit = 1

IF_PD Bit = 1

A = +25

(Note 11)

-90.30

dBc/

LMX2433

FinRF = 3200 MHz

f = 10 kHz offset

COMPRF = 1 MHz

Loop Bandwidth = 100 kHz

RF = 3200

OSCin =10MHz

OSCin =1 VPP

RF_CPG Bit = 1

IF_PD Bit = 1

A = +25

(Note 11)

-88.90

dBc/

LMX2434

FinRF = 4700 MHz

f = 10 kHz offset

COMPRF = 1 MHz

Loop Bandwidth = 100 kHz

RF = 4700

OSCin =10MHz

OSCin =1 VPP

RF_CPG Bit = 1

IF_PD Bit = 1

A = +25

(Note 11)

-85.60

dBc/

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 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 : LN(f) = L(f) − 20 log (N) − 10 log (fCOMP), 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 fCOMP 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.

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