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TLC2933AIPW Datasheet(PDF) 2 Page - Texas Instruments |
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TLC2933AIPW Datasheet(HTML) 2 Page - Texas Instruments |
2 / 19 page TLC2933A HIGH PERFORMANCE PHASE LOCKED LOOP SLES149 − OCTOBER 2005 2 TI.COM functional block diagram 4 5 6 9 12 13 10 2 3 FIN−A FIN−B PFD INHIBIT VCO IN BIAS VCO INHIBIT SELECT VCO OUT PFD OUT Phase Frequency Detector Voltage Controlled Oscillator Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION LOGIC VDD 1 Power supply for the internal logic. This power supply should be separated from VCO VDD to reduce cross-coupling between supplies. SELECT 2 I VCO output frequency select. When SELECT is high, the VCO output frequency is ×1/2 and when low. The output frequency is ×1. VCO OUT 3 O VCO output. When the VCO INHIBIT is high, VCO output is low. FIN−A 4 I Input reference frequency f(REF IN) is applied to FIN−A. FIN−B 5 I Input for VCO external counter output frequency f(FIN−B). FIN−B is nominally provided from the external counter. PFD OUT 6 O PFD output. When the PFD INHIBIT is high, PFD output is in the high-impedance state. LOGIC GND 7 GND for the internal logic. TEST 8 Connect to GND. PFD INHIBIT 9 I PFD inhibit control. When PFD INHIBIT is high, PFD output is in the high-impedance state. VCO INHIBIT 10 I VCO inhibit control. When VCO INHIBIT is high, VCO output is low. VCO GND 11 GND for VCO. VCO IN 12 I VCO control voltage input. Nominally the external loop filter output connects to VCO IN to control VCO oscillation frequency. RBIAS 13 I Bias supply. An external resistor (RBIAS) between VCO VDD and RBIAS supplies bias for adjusting the oscillation frequency range. VCO VDD 14 Power supply for VCO. This power supply should be separated from LOGIC VDD to reduce cross-coupling between supplies. |
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