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LMX2531LQ1500E Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMX2531LQ1500E Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 23 page Electrical Characteristics (V CC = 3.0 V, -40˚C ≤ T A ≤ 85 ˚C; f Fout = 1500 MHz, except as specified.) (Continued) Symbol Parameter Conditions Min Typ Max Units Digital Interface (DATA, CLK, LE, CE, Ftest/LD, FLout) V IH High-Level Input Voltage 1.6 2.75 V V IL Low-Level Input Voltage 0.4 V I IH High-Level Input Current V IH = 1.75 -3.0 3.0 µA I IL Low-Level Input Current V IL = 0 V -3.0 3.0 µA V OH High-Level Output Voltage I OH = 500 µA 2.0 2.65 V V OL Low-Level Output Voltage I OL = -500 µA 0.0 0.4 V MICROWIRE Timing t CS Data to Clock Set Up Time See Data Input Timing 25 ns t CH Data to Clock Hold Time See Data Input Timing 20 ns t CWH Clock Pulse Width High See Data Input Timing 25 ns t CWL Clock Pulse Width Low See Data Input Timing 25 ns t ES Clock to Enable Set Up Time See Data Input Timing 25 ns t CES Enable to Clock Set Up Time See Data Input Timing 25 ns t EWH Enable Pulse Width High See Data Input Timing 25 ns Note 2: 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, ina1Hz Bandwidth and Fcomp is the comparison frequency of the synthesizer. The offset frequency, f, must be chosen sufficiently smaller then the loop bandwidth of the PLL, and large enough to avoid a substantial noise contribution from the reference. Note 3: Maximum Allowable Temperature Drift for Continuous Lock is how far the temperature can drift in either direction from the value it was at the time that the R0 register was last programmed, and still have the part stay in lock. The action of programming the R0 register, even to the same value, activates a frequency calibration routine. This implies that the part will work over the entire frequency range, but if the temperature drifts more than the maximum allowable drift for continuous lock, then it will be necessary to reload the R0 register to ensure that it stays in lock. Regardless of what temperature the part was initially programmed at, the temperature can never drift outside the frequency range of -40˚C ≤TA≤ 85˚C without violating specifications. Note 4: The VCO phase noise is measured assuming that the loop bandwidth is sufficiently narrow that the VCO noise dominates. The maximum limits apply only at center frequency and over temperature, assuming that the part is reloaded at each test frequency. Over frequency, the phase noise can vary 1-2 dB, with the worst case performance typically occurring at the highest frequency. Over temperature, the phase noise typically varies 1-2 dB, assuming the part is reloaded. Serial Data Timing Diagram 20195003 www.national.com 8 |
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