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LMX2491RTWT bảng dữ liệu(PDF) 5 Page - Texas Instruments |
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LMX2491RTWT bảng dữ liệu(HTML) 5 Page - Texas Instruments |
5 / 31 page 5 LMX2491 www.ti.com SNAS711 – OCTOBER 2016 Product Folder Links: LMX2491 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated (1) For optimal phase noise performance, higher input voltage and a slew rate of at least 3 V/ns is recommended (2) PLL Noise Metrics are measured with a clean OSCin signal with a high slew rate using a wide loop bandwidth. The noise metrics model the PLL noise for an infinite loop bandwidth as: PLL_Total = 10 × log( 10PLL_Flat/10 + 10PLL_Flicker(Offset)/10) PLL_Flat = PN1Hz + 20×log(N) + 10 × log(Fpd/1Hz) PLL_Flicker = PN10kHz - 10 × log(Offset/10kHz) + 20 × log(Fvco/1GHz) (3) Charge pump mismatch varies as a function of charge pump voltage. Consult typical performance characteristics to see this variation. 6.6 Electrical Characteristics 3.15 V ≤ VCC ≤ 3.45 V, VCC ≤ VCP ≤ 5.25 V, –40 °C ≤ TA ≤ 85 °C, except as specified. Typical values are at VCC = VCP = 3.3 V, 25 °C. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Icc Current consumption All VCC pins Fpd = 10 MHz 45 mA Fpd = 100 MHz 50 Fpd = 200 MHz 55 VCP pin Kpd = 0.1 mA 2 Kpd = 1.6 mA 10 Kpd = 3.1 mA 19 IccPD Current POWERDOWN 3 fOSCin Frequency for OSCin terminal OSC_DIFFR=0, doubler disabled 10 600 MHz OSC_DIFFR=0, doubler enabled 10 300 OSC_DIFFR=1, doubler disabled 10 1200 OSC_DIFFR=1, doubler enabled 10 600 vOSCin Voltage for OSCin pin(1) 0.5 Vcc – 0.5 Vpp fFin Frequency for Fin pin 500 6400 MHz pFin Power for Fin pin Single-ended operation –5 5 dBm fPD Phase detector frequency 200 MHz PN1Hz PLL figure of merit(2) –227 dBc/Hz PN10kHz Normalized PLL 1/f noise(2) Normalized to 10-kHz offset for a 1- GHz carrier. –120 dBc/Hz ICPoutTRI Charge pump leakage tri- state leakage 10 nA ICPoutMM Charge pump mismatch(3) VCPout = VCP / 2 5% ICPout Charge pump current VCPout = VCP / 2 CPG=1X 0.1 mA … CPG=31X 3.1 LOGIC OUTPUT TERMINALS (MUXout,TRIG1,TRIG2,MOD) VOH Output high voltage 0.8 × Vcc Vcc V VOL Output low voltage 0 0.2 × Vcc V LOGIC INPUT TERMINALS (CE,CLK,DATA,LE,MUXout,TRIG1,TRIG2,MOD) VIH Input high voltage 1.4 Vcc V VIL Input low voltage 0 0.6 V IIH Input leakage –5 1 5 µA TCELOW Chip enable low time 5 µs TCEHIGH Chip enable high time 5 µs |
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