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TLC2932IPWR Datasheet(PDF) 2 Page - Texas Instruments |
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TLC2932IPWR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 29 page TLC2932 HIGH-PERFORMANCE PHASE-LOCKED LOOP SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION 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. LOGIC GND 7 GND for the internal logic. LOGIC VDD 1 Power supply for the internal logic. This power supply should be separate from VCO VDD to reduce cross-coupling between supplies. NC 8 No internal connection. PFD INHIBIT 9 I PFD inhibit control. When PFD INHIBIT is high, PFD output is in the high-impedance state, see Table 3. PFD OUT 6 O PFD output. When the PFD INHIBIT is high, PFD output is in the high-impedance state. BIAS 13 I Bias supply. An external resistor (RBIAS) between VCO VDD and BIAS supplies bias for adjusting the oscillation frequency range. 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, see Table 1. VCO IN 12 I VCO control voltage input. Nominally the external loop filter output connects to VCO IN to control VCO oscillation frequency. VCO INHIBIT 10 I VCO inhibit control. When VCO INHIBIT is high, VCO OUT is low (see Table 2). VCO GND 11 GND for VCO. VCO OUT 3 O VCO output. When the VCO INHIBIT is high, VCO output is low. VCO VDD 14 Power supply for VCO. This power supply should be separated from LOGIC VDD to reduce cross-coupling between supplies. detailed description VCO oscillation frequency The VCO oscillation frequency is determined by an external resistor (RBIAS) connected between the VCO VDD and the BIAS terminals. The oscillation frequency and range depends on this resistor value. The bias resistor value for the minimum temperature coefficient is nominally 3.3 k Ω with 3-V at the VCO VDD terminal and nominally 2.2 k Ω with 5-V at the VCO VDD terminal. For the lock frequency range refer to the recommended operating conditions. Figure 1 shows the typical frequency variation and VCO control voltage. VCO Oscillation Frequency Range Bias Resistor (RBIAS) 1/2 VDD VCO Control Voltage (VCO IN) Figure 1. VCO Oscillation Frequency |
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