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LMX2531LQ1910E Datasheet(PDF) 7 Page - Texas Instruments |
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LMX2531LQ1910E Datasheet(HTML) 7 Page - Texas Instruments |
7 / 41 page LMX2531 www.ti.com SNAS252R – OCTOBER 2005 – REVISED FEBRUARY 2013 Electrical Characteristics (continued) (VCC = 3.0 V, -40°C ≤ TA ≤ 85 °C; except as specified.) Symbol Parameter Conditions Min Typ Max Units Charge Pump 0.4 V < VCPout < 2.0 V ICPoutV Current vs. CP Voltage 4 % TA = 25°C Variation CP Current vs. Temperature ICPoutT VCPout = 1.2 V 8 % Variation Normalized PLL 1/f Noise ICP = 1X Charge Pump Gain -94 LNPLL_flicker(10 kHz) dBc/Hz ICP = 16X Charge Pump Gain -104 (2) LN(f) Normalized PLL Noise Floor ICP = 1X Charge Pump Gain -202 LNPLL_flat dBc/Hz ICP = 16X Charge Pump Gain -212 (3) VCO Frequencies LMX2531LQ1146E 1106 1184 LMX2531LQ1226E 1184 1268 LMX2531LQ1312E 1268 1360 LMX2531LQ1415E 1360 1470 LMX2531LQ1500E 1499 1510 LMX2531LQ1515E 1450 1580 LMX2531LQ1570E 1530 1636 Operating Frequency Range LMX2531LQ1650E 1590 1700 (All options have a frequency fFout divider, this applies before the LMX2531LQ1700E 1662 1770 MHz divider. The frequency after the LMX2531LQ1742 1760 1866 divider is half of what is shown) LMX2531LQ1778E 1726 1840 LMX2531LQ1910E 1834 2028 LMX2531LQ2080E 1904 2274 LMX2531LQ2265E 2178 2400 LMX2531LQ2570E 2336 2790 LMX2531LQ2820E 2710 2925 LMX2531LQ3010E 2910 3132 Other VCO Specifications LMX2531LQ1742 65 Maximum Allowable LMX2531LQ1500E/1570E/1650E/ Temperature Drift for 90 ΔTCL 1146E/1226/1312E/1415E/1515E °C Continuous Lock LMX2531LQ1700E/1778E/1910E/ (4) 125 2080E/2265E/2570E/2820E/3010E (2) One of the specifications for modeling PLL in-band phase noise is the PLL 1/f noise normalized to 1 GHz carrier frequency and 10 kHz offset, LPLL_flicker(10 kHz). From this normalized index of PLL 1/f noise, the PLL 1/f noise can be calculated for any carrier and offset frequency as: LNPLL_flicker(f) = LPLL_flicker(10 kHz) - 10·log(10 kHz / f) + 20·log( Fout / 1 GHz ). Flicker noise can dominate at low offsets from the carrier and has a 10 dB/decade slope and improves with higher charge pump currents and at higher offset frequencies . To accurately measure LPLL_flicker(10 kHz) it is important to use a high phase detector frequency and a clean reference to make it such that this measurement is on the 10 dB/decade slope close to the carrier. LPLL_flicker(f) can be masked by the reference oscillator performance if a low power or noisy source is used. The total PLL in-band phase noise performance is the sum of LPLL_flicker(f) and LPLL_flat. In other words,LPLL(f) = 10·log(10( LN PLL_flat / 10 ) + 10(LN PLL_flicker (f) / 10 ) (3) A specification used for modeling PLL in-band phase noise floor is the Normalized PLL noise floor, LNPLL_flat, and is defined as: LNPLL_flat = L(f) – 20·log(N) – 10·log(fPD). LPLL_flat is the single side band phase noise in a 1 Hz Bandwidth and fPD is the phase detector frequency of the synthesizer. LPLL_flat contributes to the total noise, L(f). To measure LPLL_flat the offset frequency must be chosen sufficiently smaller then the loop bandwidth of the PLL, and yet large enough to avoid a substantial noise contribution from the reference and PLL flicker noise. LPLL_flat can be masked by the reference oscillator performance if a low power or noisy source is used. The total PLL in-band phase noise performance is the sum of LPLL_flicker(f) and LPLL_flat. In other words,LPLL(f) = 10·log(10( LN PLL_flat / 10 ) + 10(LN PLL_flicker (f) / 10 ) (4) 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. Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LMX2531 |
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