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TLC2942 Datasheet(PDF) 6 Page - Texas Instruments |
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TLC2942 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 28 page TLC2942 HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PFD output control A high level on PFD INHIBIT places the PFD OUT in the high-impedance state and the PFD stops phase detection as shown in Table 4 and Table 5. A high level on PFD INHIBIT also can be used as the power-down mode for the PFD. Table 4. PFD1 Inhibit Function PFD INHIBIT1 DETECTION PFD OUT1 PFD1 IDD Low Active Active Normal High Stop Hi-Z Power Down Table 5. PFD2 Inhibit Function Table PFD INHIBIT2 DETECTION PFD OUT2 PFD2 IDD Low Active Active Normal High Stop Hi-Z Power Down schematics VCO block schematic (VCO1, VCO2) Bias Circuit VCO Output 1/2 RBIAS VCOIN1, VCOIN2 (VCO control) VCOINHIBIT VCO OUT1, VCO OUT2 SELECT1,2 M U X Ring Oscillator PFD block schematic (PFD1, PFD2) Detector Charge Pump PFD OUT FIN –A FIN –B PFD INHIBIT VDD |
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