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LMX2541SQ3030E Datasheet(PDF) 8 Page - Texas Instruments |
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LMX2541SQ3030E Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 64 page  LMX2541SQ2060E, LMX2541SQ2380E LMX2541SQ2690E, LMX2541SQ3030E LMX2541SQ3320E, LMX2541SQ3740E SNOSB31I – JULY 2009 – REVISED FEBRUARY 2013 www.ti.com Electrical Characteristics (continued) (3.15 V ≤ VCC ≤ 3.45 V, -40°C ≤ TA ≤ 85 °C; except as specified. Typical values are at Vcc = 3.3 V, 25 C.) Symbol Parameter Conditions Min Typ Max Units 13 - 2060E 23 16 - 2380E The lower number in the range 30 applies when the VCO is at its 17 - lowest frequency and the higher 2690E 32 number applies when the VCO KVtune Fine Tuning Sensitivity MHz/V is at its highest frequency. A 20 - 3030E linear approximation can be 37 used for frequencies between 21 - these two cases. 3320E 37 24 - 3740E 42 Default Power Mode VCO_DIV = 2 -20 Second Harmonic HSRFout (8) dBc (7) VCO_DIV = 3 -20 50 Ω Load Default Power Mode VCO_DIV = 2 3 Duty Cycle Error DERFout (8) % (7) VCO_DIV = 3 3 50 Ω Load PSHVCO VCO Frequency Pushing CVregVCO = 4.7 µF, Open Loop 600 kHz/V VCO_DIV = 1 ±800 VSWR 1.7 to 1 PULVCO VCO Frequency Pulling kHz (6 dB Pad) VCO_DIV > 1 ±60 2060E 1.6 Integration Bandwidth 2380E 1.8 = 100 Hz to 20 MHz Middle VCO Frequency 2690E 2.1 σΦ RMS Phase Error 100 MHz Wenzel Crystal mRad 3030E 2.1 Reference Integer Mode 3320E 2.3 Optimized Loop Bandwidth 3740E 2.6 VCO Phase Noise (9) 10 kHz Offset -89.7 100 kHz Offset -113.7 fRFout = Min VCO 1 MHz Offset -134.9 Frequency 10 MHz Offset -155.4 20 MHz Offset -160.3 Phase Noise L(f)Fout dBc/Hz 2060E 10 kHz Offset -86.5 100 kHz Offset -111.4 fRFout = Max VCO 1 MHz Offset -132.8 Frequency 10 MHz Offset -153.4 20 MHz Offset -158.5 (7) The duty cycle error (DE) and second harmonic (HS) are theoretically related by the equation HS = 10·log| 2 π·DE | - 6 dB. A square wave with 3% duty cycle theoretically has a second harmonic of -20 dBc. (8) The LMX2541 RFout power level is programmable with the program words of VCOGAIN, OUTTERM, and DIVGAIN. Changing these words can change the output power of the VCO as well as the current consumption of the output buffer. For the purpose of consistency in electrical specifications, "Default Power Mode" is defined to be the settings of VCOGAIN = OUTTERM = DIVGAIN = 12. (9) The VCO phase noise is measured assuming that the loop bandwidth is sufficiently narrow that the VCO noise dominates. The phase noise is measured with AC_TEMP_COMP = 5 and the device is reloaded at each test frequency. The typical performance characteristics section shows how the VCO phase noise varies over temperature and frequency. 8 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LMX2541SQ2060E LMX2541SQ2380E LMX2541SQ2690E LMX2541SQ3030E LMX2541SQ3320E LMX2541SQ3740E |
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