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TLC2942 Datasheet(PDF) 5 Page - Texas Instruments |
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TLC2942 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 28 page TLC2942 HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 VCO inhibit function Each VCO has an externally controlled inhibit function that inhibits the VCO output. The VCO oscillation is stopped during a high level on VCOINHIBIT, so the high level can also be used as the power-down mode. The VCO output maintains a low level during the power-down mode (see Table 2 and Table 3). Table 2. VCO1 Inhibit Function VCOINHIBIT1 VCO1 OSCILLATOR VCO OUT1 VCO1 IDD Low Active Active Normal High Stop Low Power Down Table 3. VCO2 Inhibit Function VCOINHIBIT2 VCO2 OSCILLATOR VCO OUT2 VCO2 IDD Low Active Active Normal High Stop Low Power Down PFD operation The PFD is a high-speed, edge-triggered detector with an internal charge pump. The PFD detects the phase difference between two frequency inputs supplied to FIN–A and FIN–B as shown in Figure 2. Nominally the reference is supplied to FIN–A, and the frequency from the external counter output is fed to FIN–B. FIN– A1, FIN–A2 FIN– B1, FIN–B2 PFD OUT1, PFD OUT2 VOH Hi-Z VOL Figure 2. PFD Function Timing Chart |
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