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ICL8038CCPD Datasheet(PDF) 5 Page - Intersil Corporation |
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ICL8038CCPD Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 10 page 5 The levels of the current sources can, however, be selected over a wide range with two external resistors. Therefore, with the two currents set at values different from I and 2I, an asymmetrical sawtooth appears at Terminal 3 and pulses with a duty cycle from less than 1% to greater than 99% are available at Terminal 9. The sine wave is created by feeding the triangle wave into a nonlinear network (sine converter). This network provides a decreasing shunt impedance as the potential of the triangle moves toward the two extremes. Waveform Timing The symmetry of all waveforms can be adjusted with the external timing resistors. Two possible ways to accomplish this are shown in Figure 3. Best results are obtained by keeping the timing resistors RA and RB separate (A). RA controls the rising portion of the triangle and sine wave and the 1 state of the square wave. The magnitude of the triangle waveform is set at 1/3 VSUPPLY; therefore the rising portion of the triangle is, The falling portion of the triangle and sine wave and the 0 state of the square wave is: Thus a 50% duty cycle is achieved when RA = RB. If the duty cycle is to be varied over a small range about 50% only, the connection shown in Figure 3B is slightly more convenient. A 1k Ω potentiometer may not allow the duty cycle to be adjusted through 50% on all devices. If a 50% duty cycle is required, a 2k Ω or 5kΩ potentiometer should be used. With two separate timing resistors, the frequency is given by: or, if RA = RB = R t 1 CV × I -------------- C 1/3 V SUPPLY R A × × × 0.22 V SUPPLY × ------------------------------------------------------------------- R A C × 0.66 ------------------ == = t 2 CV × 1 ------------- C 1 /3 V SUPPLY × 2 0.22 () V SUPPLY R B ------------------------ 0.22 V SUPPLY R A ------------------------ – ----------------------------------------------------------------------------------- R A R B C 0.66 2 RA RB – () -------------------------------------- == = f 1 t 1 t 2 + ---------------- 1 R AC 0.66 ------------ 1 R B 2R A R B – ------------------------- + ------------------------------------------------------ == f 0.33 RC ----------- (for Figure 3A) = FIGURE 2A. SQUARE WAVE DUTY CYCLE - 50% FIGURE 2B. SQUARE WAVE DUTY CYCLE - 80% FIGURE 2. PHASE RELATIONSHIP OF WAVEFORMS FIGURE 3A. FIGURE 3B. FIGURE 3. POSSIBLE CONNECTIONS FOR THE EXTERNAL TIMING RESISTORS C 82K ICL8038 456 9 2 12 11 10 8 7 RA RL V- OR GND 3 RB V+ ICL8038 456 9 2 12 11 10 8 7 C 100K RA RL V- OR GND 3 RB V+ 1k Ω ICL8038 |
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