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TLC2940IPW Datasheet(PDF) 2 Page - Texas Instruments |
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TLC2940IPW Datasheet(HTML) 2 Page - Texas Instruments |
2 / 10 page TLC2940 HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR SLAS244 – OCTOBER 1999 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O{ DESCRIPTION NAME NO. I/O{ DESCRIPTION BIAS 7 M Bias supply terminal for internal VCO. The resistor should be located between VDD and this terminal. FREFINPUT 3 I Not used. This terminal should be tied to ground. GND 5 PS Ground LOGIC VDD 1 PS Power supply for the internal logic circuitry (PFD portion, input/output portion). It is recommended that this terminal is separated from the VCO supply voltage terminal. PFD OUT 4 O Not used. This terminal should be unconnected (open). VCOIN 6 I VCO control voltage input. VCO OUT 2 O VCO output. This terminal is tied to a low level at inhibit status. VCO VDD 8 PS Supply voltage for VCO analog portion. † I: Input, O: Output, PS: Power supply/GND, M: Others detailed description The TLC2940 is an analog VCO IC that generates a frequency that is a multiple of a reference frequency for a PLL block configuration. Normally, a PLL block is composed of a VCO, a phase frequency detector, counter logic, and a loop filter. The following is a description for the analog VCO of the TLC2940. The built-in analog VCO is composed of a ring oscillator portion for oscillation operation and a bias control portion to generate a bias level to supply to the ring oscillator. The oscillation operation is performed by a bias resistor (RBIAS) connected between the bias control (pin 7) and the supply voltage (pin 8). The VCO oscillation frequency is determined by this resistor value, RBIAS, that is, the oscillation frequency decreases as the resistor value increases, and the oscillation frequency increases as the resistor value decreases. The lock frequency range is from 35 MHz to 75 MHz with a RBIAS of 1.5 kΩ to 4.3 kΩ at 5-V operation and from 28 MHz to 50 MHz with a RBIAS of 1.5 kΩ to 2.7 kΩ at 3-V operation over the recommended supply voltage and operating free-air temperature range. Refer to the curves shown in the typical characteristics section for the lock frequency ranges with varying RBIAS values. VCO Oscillation Frequency Range Bias Resistor (RBIAS) VCO Control Voltage (VCOIN) VCO Oscillation Figure 1. VCO Oscillation Frequency Range Setting |
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