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SL1461MPAS Datasheet(PDF) 9 Page - Zarlink Semiconductor Inc |
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SL1461MPAS Datasheet(HTML) 9 Page - Zarlink Semiconductor Inc |
9 / 13 page 9 SL1461SA Advance Information Fig.8 SL1461SA VCO centre frequency uncompensated temperature stability 479.5 478.5 477.5 476.5 475.5 –20 30 80 VCO STABILITY vs TEMP and SUPPLY TEMP/ °C 480 479 478 477 476 55 5 4.5 4.75 5 5.25 5.5 SUPPLY (V) Fig.9 SL1461SA AGC output voltage for differing values of AGC bias resistor AGC 2.0 1.5 1.0 0.5 –70 –60 –50 –40 –30 –20 –10 0 VCC VOLTAGE RF INPUT LEVEL (dBm) UNMODULATED OUTPUT AGC BIAS RESISTOR 5.1K AGC BIAS CURRENT 297 A AGC LOAD RESISTOR 3.9K AGC BIAS RESISTOR 10.5K AGC BIAS CURRENT 150 A AGC LOAD RESISTOR 4.7K AGC BIAS RESISTOR 32K AGC BIAS CURRENT 52 A AGC LOAD RESISTOR 10K = 5.0 VOLTS APPLICATION NOTES Capture range Under conditions when there is no RF input signal present, the SL1461SA may react to spurious radiation from the free running oscillator coupling into the RF inputs. Because of the constant phase error between the VCO input to the phase detector and the spuriously coupled signal via the RF input, the phase comparator will drive the control voltage to either the bottom or the top of the range. In such a case, the capture range will be asymmetrical about the VCO free running frequency, since any control voltage will only be able to tune the VCO in one direction if the tuning voltage is already at the max or min. This effect can be avoided by driving the RF input differentially or achieving good common mode rejection to the VCO signal. The lock range is independant of the above effects and will be symmetric about the centre of the phase detector S- curve provided the VCO is correctly aligned. EXAMPLE Loop out of lock Tuning voltage =4.3V (maximum) frequency =520MHz (maximum It is only possible to capture signals below this frequency since the VCO is already at its maximum frequency. Testing of capture range should be done with the device operating under normal conditions. An input signal of between -35dBm to -10dBm is suitable for such a measurement. |
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