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LMX2485ESQ Datasheet(PDF) 6 Page - Texas Instruments |
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LMX2485ESQ Datasheet(HTML) 6 Page - Texas Instruments |
6 / 46 page LMX2485, LMX2485E SNAS236G – OCTOBER 2005 – REVISED JANUARY 2016 www.ti.com Electrical Characteristics (continued) (VCC = 3.0V; -40°C ≤ TA ≤ +85°C unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Magnitude of IF CP sink vs CP VCPoutIF = VCC/2 | ICPoutIF%MIS | 1% 8% source mismatch TA = 25°C Magnitude of IF CP current vs 0.5 ≤ VCPoutIF ≤ VCC -0.5 | ICPoutIF%V | 4% 10% CP voltage TA = 25°C Magnitude of IF CP current vs | ICPoutIF%TEMP VCPoutIF = VCC/2 4% temperature OSCILLATOR PARAMETERS OSC2X = 0 5 110 MHz fOSCin Oscillator operating frequency OSC2X = 1 5 20 MHz vOSCin Oscillator input sensitivity 0.5 VCC VP-P IOSCin Oscillator input current –100 100 µA SPURS Spurs in band See (4) –55 dBc PHASE NOISE RF_CPG = 0 –202 RF_CPG = 1 –202 RF synthesizer normalized LF1HzRF RF_CPG = 3 –206 dBc/Hz phase noise contribution(5) RF_CPG = 7 –208 RF_CPG = 15 –210 IF synthesizer normalized phase LF1HzIF –209 dBc/Hz noise contribution DIGITAL INTERFACE (DATA, CLK, LE, ENOSC, CE, Ftest/LD, FLoutRF) VIH High-level input voltage 1.6 VCC V VIL Low-level input voltage 0.4 V IIH High-level input current VIH = VCC –1 1 µA IIL Low-level input current VIL = 0 V –1 1 µA VOH High-level output voltage IOH = –500 µA VCC - 0.4 V VOL Low-level output voltage IOL = 500 µA 0.4 V (4) To measure the in-band spur, the fractional word is chosen such that when reduced to lowest terms, the fractional numerator is one. The spur offset frequency is chosen to be the comparison frequency divided by the reduced fractional denominator. The loop bandwidth must be sufficiently wide to negate the impact of the loop filter. Measurement conditions are: Spur Offset Frequency = 10 kHz, Loop Bandwidth = 100 kHz, Fraction = 1/2000, Comparison Frequency = 20 MHz, RF_CPG = 7, DITH = 0, and a 4th Order Modulator (FM = 0). These are relatively consistent over tuning range. (5) Normalized Phase Noise Contribution is defined as: LN(f) = L(f) – 20log(N) – 10log(fCOMP) where L(f) is defined as the single side band phase noise measured at an offset frequency, f, in a 1 Hz Bandwidth. The offset frequency, f, must be chosen sufficiently smaller than the PLL loop bandwidth, yet large enough to avoid substantial phase noise contribution from the reference source. Measurement conditions are: Offset Frequency = 11 kHz, Loop Bandwidth = 100 kHz for RF_CPG = 7, Fraction = 1/2000, Comparison Frequency = 20 MHz, FM = 0, DITH = 0. 6 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LMX2485 LMX2485E |
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