Datasheet LM339, LM339E, LM239, LM2901, LM2901E, LM2901V, NCV2901, MC3302 (ON Semiconductor) - 6
| Manufacturer | ON Semiconductor |
| Description | Single Supply Quad Comparators |
| Pages / Page | 11 / 6 — LM339, LM339E, LM239, LM2901, LM2901E, LM2901V, NCV2901, MC3302. … |
| Revision | 25 |
| File Format / Size | PDF / 165 Kb |
| Document Language | English |
LM339, LM339E, LM239, LM2901, LM2901E, LM2901V, NCV2901, MC3302. APPLICATIONS INFORMATION. Figure 9. Zero Crossing Detector
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LM339, LM339E, LM239, LM2901, LM2901E, LM2901V, NCV2901, MC3302 APPLICATIONS INFORMATION
These quad comparators feature high gain, wide addition of positive feedback (< 10 mV) is also bandwidth characteristics. This gives the device oscillation recommended. It is good design practice to ground all tendencies if the outputs are capacitively coupled to the unused input pins. inputs via stray capacitance. This oscillation manifests itself Differential input voltages may be larger than supply during output transitions (VOL to VOH). To alleviate this voltages without damaging the comparator’s inputs. situation input resistors < 10 kW should be used. The Voltages more negative than −300 mV should not be used. +15 V R1 R4 R5 10 k 220 k 220 k V 8.2 k in(min) ≈ 0.4 V peak for 1% phase distortion (Dq). V * in 6.8 k V V O V in(min) in D1 R2 ) VCC q 15 k 10 M R3 * 10 k V V O in VCC + D1 prevents input from going negative by more than 0.6 V. R1 + R2 = R3 VO q VEE R3 ≤ R5 for small error in zero crossing Dq 10 VEE
Figure 9. Zero Crossing Detector Figure 10. Zero Crossing Detector (Single Supply) (Split Supplies) www.onsemi.com 6
These quad comparators feature high gain, wide addition of positive feedback (< 10 mV) is also bandwidth characteristics. This gives the device oscillation recommended. It is good design practice to ground all tendencies if the outputs are capacitively coupled to the unused input pins. inputs via stray capacitance. This oscillation manifests itself Differential input voltages may be larger than supply during output transitions (VOL to VOH). To alleviate this voltages without damaging the comparator’s inputs. situation input resistors < 10 kW should be used. The Voltages more negative than −300 mV should not be used. +15 V R1 R4 R5 10 k 220 k 220 k V 8.2 k in(min) ≈ 0.4 V peak for 1% phase distortion (Dq). V * in 6.8 k V V O V in(min) in D1 R2 ) VCC q 15 k 10 M R3 * 10 k V V O in VCC + D1 prevents input from going negative by more than 0.6 V. R1 + R2 = R3 VO q VEE R3 ≤ R5 for small error in zero crossing Dq 10 VEE
Figure 9. Zero Crossing Detector Figure 10. Zero Crossing Detector (Single Supply) (Split Supplies) www.onsemi.com 6
