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UC2860QTR датащи(PDF) 5 Page - Texas Instruments |
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UC2860QTR датащи(HTML) 5 Page - Texas Instruments |
5 / 10 page UC1860 UC2860 UC3860 VARIABLE FREQUENCY OSCILLATOR The VFO block is controlled through 4 pins: CVFO, lVFO, Osc Dsbl (oscillator disable), and Trig (trigger input). Os- cillator frequency is approximately: Frequency = IVFO/(CVFO * 1V) With a fixed capacitor and low voltage applied to Trig and Osc Dsbl, frequency is linearly modulated by varying the current into the lVFO pin. The Trig and Osc Dsbl inputs are used to modify VFO op- eration. If Osc Dsbl is held high, the oscillator will com- plete the current cycle but wait until Osc Dsbl is returned low to initiate a new cycle. If a pulse is applied to Trig dur- ing a cycle, the oscillator will immediately initiate a new cycle. Osc Dsbl has priority over Trig, but if a trigger pulse is received while Osc Dsbl is high, the VFO will remember the trigger pulse and start a new cycle as soon as Osc Dsbl goes low. Normally low trigger pulses are used to synchronize the oscillator to a faster clock. Normally high trigger pulses can also be used to synchronize to a slower clock. ONE SHOT TIMER The one shot timer performs three functions and is pro- grammed by the RC pin. The first function is to control output driver pulse width. Secondly, it clocks the toggle flip-flop. Thirdly, it establishes the maximum allowable fre- quency for the VFO. One shot operation is initiated at the beginning of each oscillator cycle. The RC pin, pro- grammed by an external resistor and capacitor to ground, is charged to approximately 4.3V and then allowed to dis- charge. The lower threshold is approximately 80% of the peak. On time is approximately: t(on) = 0.2 * R * C. After crossing the lower threshold, the resistor continues to discharge the capacitor to approximately 3V, where it waits for the next oscillator cycle. Maximum Frequency vs R On Time vs R VFO Frequency vs IVFO 5 |
Аналогичный номер детали - UC2860QTR |
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Аналогичное описание - UC2860QTR |
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