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ICL8038ACJD Datasheet(PDF) 4 Page - Intersil Corporation |
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ICL8038ACJD Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 10 page 4 Test Circuit Application Information (See Functional Diagram) An external capacitor C is charged and discharged by two current sources. Current source #2 is switched on and off by a flip-flop, while current source #1 is on continuously. Assuming that the flip-flop is in a state such that current source #2 is off, and the capacitor is charged with a current I, the voltage across the capacitor rises linearly with time. When this voltage reaches the level of comparator #1 (set at 2/3 of the supply voltage), the flip-flop is triggered, changes states, and releases current source #2. This current source normally carries a current 2I, thus the capacitor is discharged with a net-current I and the voltage across it drops linearly with time. When it has reached the level of comparator #2 (set at 1/3 of the supply voltage), the flip-flop is triggered into its original state and the cycle starts again. Four waveforms are readily obtainable from this basic generator circuit. With the current sources set at I and 2I respectively, the charge and discharge times are equal. Thus a triangle waveform is created across the capacitor and the flip-flop produces a square wave. Both waveforms are fed to buffer stages and are available at pins 3 and 9. Detailed Schematic ICL8038 456 9 2 12 11 10 8 7 SW1 N.C. C 3300pF 82K RA 10K RB 10K RL 10K RTRI RSINE -10V 3 +10V FIGURE 1. TEST CIRCUIT Q20 Q21 Q19 Q22 Q31 Q32 Q33 Q34 Q30 Q7 Q6 Q1 Q2 Q4 Q8 Q9 Q5 Q3 Q14 Q11 Q12 Q13 Q24 Q23 Q25 Q26 Q29 Q27 Q28 Q10 Q15 Q18 Q17 Q16 Q35 Q36 Q 38 Q40 Q37 Q39 R1 11K R2 39K 7 8 5 4 REXT BREXT A COMPARATOR R41 4K R8 5K R9 5K R10 5K R43 27K R42 27K BUFFER AMPLIFIER R41 27K R17 4.7K R18 4.7K R14 27K R13 620 R16 1.8K R6 100 R5 100 R4 100 R3 30K R46 40K CEXT R7A 10K R7B 15K R44 1K 3 10 R11 270 R12 2.7K R15 470 R24 800 2 R21 10K R20 2.7K R19 800 FLIP-FLOP SINE CONVERTER Q49 Q50 Q52 Q51 Q53 Q55 Q54 Q56 Q42 Q41 Q43 Q44 Q45 Q46 Q47 Q48 6 V+ 1 12 R32 5.2K R33 200 R34 375 R35 330 R36 1600 R37 330 R38 375 R39 200 R40 5.6K REXTC 82K R23 2.7K R22 10K R28 33K R30 33K R29 33K R31 33K R25 33K R26 33K R27 33K R45 33K CURRENT SOURCES 9 11 ICL8038 |
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