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TLC2932 Datasheet(PDF) 3 Page - Texas Instruments |
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TLC2932 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 29 page TLC2932 HIGH-PERFORMANCE PHASE-LOCKED LOOP SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 VCO output frequency 1/2 divider The TLC2932 SELECT terminal sets the fosc or 1/2 fosc VCO output frequency as shown in Table 1. The 1/2 fosc output should be used for minimum VCO output jitter. Table 1. VCO Output 1/2 Divider Function SELECT VCO OUTPUT Low fosc High 1/2 fosc VCO inhibit function The VCO has an externally controlled inhibit function which inhibits the VCO output. A high level on the VCO INHIBIT terminal stops the VCO oscillation and powers down the VCO. The output maintains a low level during the power-down mode, refer to Table 2. Table 2. VCO Inhibit Function VCO INHIBIT VCO OSCILLATOR VCO OUTPUT IDD(VCO) Low Active Active Normal High Stopped Low level 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– A FIN– B PFD OUT VOH Hi-Z VOL Figure 2. PFD Function Timing Chart PFD output control A high level on the PFD INHIBIT terminal places the PFD output in the high-impedance state and the PFD stops phase detection as shown in Table 3. A high level on the PFD INHIBIT terminal also can be used as the power-down mode for the PFD. Table 3. VCO Output Control Function PFD INHIBIT DETECTION PFD OUTPUT IDD(PFD) Low Active Active Normal High Stopped Hi-Z Power Down |
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