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LMX2485ESQX bảng dữ liệu(PDF) 5 Page - National Semiconductor (TI) |
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LMX2485ESQX bảng dữ liệu(HTML) 5 Page - National Semiconductor (TI) |
5 / 37 page Electrical Characteristics (V CC = 3.0V; -40˚C ≤ T A ≤ +85˚C unless otherwise specified) (Continued) Symbol Parameter Conditions Value Units Min Typ Max PHASE NOISE L F1HzRF RF Synthesizer Normalized Phase Noise Contribution (Note 7) RF_CPG = 0 -202 dBc/Hz RF_CPG = 1 -202 RF_CPG = 3 -206 RF_CPG = 7 -208 RF_CPG = 15 -210 L F1HzIF IF Synthesizer Normalized Phase Noise Contribution -209 dBc/Hz DIGITAL INTERFACE (DATA, CLK, LE, ENOSC, CE, Ftest/LD, FLoutRF) V IH High-Level Input Voltage 1.6 V CC V V IL Low-Level Input Voltage 0.4 V I IH High-Level Input Current V IH =VCC -1.0 1.0 µA I IL Low-Level Input Current V IL = 0 V -1.0 1.0 µA V OH High-Level Output Voltage I OH = -500 µA V CC-0.4 V V OL Low-Level Output Voltage I OL = 500 µA 0.4 V MICROWIRE INTERFACE TIMING t CS Data to Clock Set Up Time See MICROWIRE Input Timing 25 ns t CH Data to Clock Hold Time See MICROWIRE Input Timing 8 ns t CWH Clock Pulse Width High See MICROWIRE Input Timing 25 ns t CWL Clock Pulse Width Low See MICROWIRE Input Timing 25 ns t ES Clock to Load Enable Set Up Time See MICROWIRE Input Timing 25 ns t EW Load Enable Pulse Width See MICROWIRE Input Timing 25 ns Note 3: A slew rate of at least 100 V/uS is recommended for frequencies below 500 MHz for optimal performance. Note 4: For Phase Detector Frequencies above 20 MHz, Cycle Slip Reduction (CSR) may be required. Legal divide ratios are also required. Note 5: Refer to table in Section 2.4.2 RF_CPG -- RF PLL Charge Pump Gain for complete listing of charge pump currents. Note 6: In order 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. Note 7: 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. 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. MICROWIRE INPUT TIMING DIAGRAM 20087775 www.national.com 5 |
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