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LMX2430TM bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI) |
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LMX2430TM bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI) |
9 / 49 page Electrical Characteristics (Continued) Vcc = EN = 2.5V, −40˚C ≤ T A ≤ +85˚C, unless otherwise specified Symbol Parameter Conditions Value Units Min Typ Max PHASE NOISE CHARACTERISTICS L NRF(f) RF Synthesizer Normalized Phase Noise Contribution (Note 10) TCXO Reference Source RF_CPG Bit = 1 IF_PD Bit = 1 -219.0 dBc/ Hz L NIF(f) IF Synthesizer Normalized Phase Noise Contribution (Note 10) TCXO Reference Source IF_CPG Bit = 1 RF_PD Bit = 1 -214.0 dBc/ Hz L RF(f) RF Synthesizer Single Side Band Phase Noise Measured LMX2430 f FinRF = 2750 MHz f = 10 kHz offset f COMPRF = 1 MHz Loop Bandwidth = 100 kHz N RF = 2750 f OSCin =10MHz v OSCin =1 VPP RF_CPG Bit = 1 IF_PD Bit = 1 T A = +25 oC (Note 11) -90.30 dBc/ Hz LMX2433 f FinRF = 3200 MHz f = 10 kHz offset f COMPRF = 1 MHz Loop Bandwidth = 100 kHz N RF = 3200 f OSCin =10MHz v OSCin =1 VPP RF_CPG Bit = 1 IF_PD Bit = 1 T A = +25 oC (Note 11) -88.90 dBc/ Hz LMX2434 f FinRF = 4700 MHz f = 10 kHz offset f COMPRF = 1 MHz Loop Bandwidth = 100 kHz N RF = 4700 f OSCin =10MHz v OSCin =1 VPP RF_CPG Bit = 1 IF_PD Bit = 1 T A = +25 oC (Note 11) -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 * (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. www.national.com 9 |
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