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MCH12140 데이터시트(PDF) 4 Page - ON Semiconductor |
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MCH12140 데이터시트(HTML) 4 Page - ON Semiconductor |
4 / 5 page MCH12140, MCK12140 http://onsemi.com 4 APPLICATIONS INFORMATION The 12140 is a high speed digital circuit used as a phase comparator in an analog phase-locked loop. The device determines the “lead” or “lag” phase relationship and time difference between the leading edges of a VCO (V) signal and a Reference (R) input. Since these edges occur only once per cycle, the detector has a range of ±2p radians. The operation of the 12140 can best be described using the plots of Figure 2. Figure 2 plots the average value of U, D and the difference between U and D versus the phase difference between the V and R inputs. There are four potential relationships between V and R: R lags or leads V and the frequency of R is less than or greater than the frequency of V. Under these four conditions the 12140 will function as follows: Figure 2. Average Output Voltage vs. Phase Difference VOH − VOL 2 −2p −pp 2p U Fv > Fr R lags V VOH Fv < Fr R leads V VOH − VOL 2 D VOH VOH − VOL 2 U−D VOL − VOH 2 −2p −pp 2p −2p −pp 2p R lags V in phase When the R and V inputs are equal in frequency and the phase of R lags that of V the U output will stay HIGH while the D output will pulse from HIGH to LOW. The magnitude of the pulse will be proportional to the phase difference between the V and R inputs reaching a minimum 50% duty cycle under a 180 ° out of phase condition. The signal on D indicates to the VCO to decrease in frequency to bring the loop into lock. V frequency > R frequency When the frequency of V is greater than that of R the 12140 behaves in a similar fashion as above. Again the signal on D indicates that the VCO frequency must be decreased to bring the loop into lock. R leads V in phase When the R and V inputs are equal in frequency and the phase of R leads that of V the D output will stay HIGH while the U output pulses from HIGH to LOW. The magnitude of the pulse will be proportional to the phase difference between the V and R inputs reaching a minimum 50% duty cycle under a 180 ° out of phase condition. The signal on U indicates to the VCO to increase in frequency to bring the loop into lock. V frequency < R frequency When the frequency of V is less than that of R the 12140 behaves in a similar fashion as above. Again the signal on U indicates that the VCO frequency must be decreased to bring the loop into lock. From Figure 2 when V and R are at the same frequency and in phase the value of U − D is zero thus providing a zero error voltage to the VCO. This situation indicates the loop is in lock and the 12140 action will maintain the loop in its locked state. ORDERING INFORMATION Device Package Shipping† MCH12140D SOIC−8 98 Units / Rail MCH12140DG SOIC−8 (Pb−Free) 98 Units / Rail MCH12140DR2 SOIC−8 2500 / Tape & Reel MCH12140DR2G SOIC−8 (Pb−Free) 2500 / Tape & Reel MCK12140D SOIC−8 98 Units / Rail MCK12140DG SOIC−8 (Pb−Free) 98 Units / Rail MCK12140DR2 SOIC−8 2500 / Tape & Reel MCK12140DR2G SOIC−8 (Pb−Free) 2500 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. |
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유사한 설명 - MCH12140_06 |
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