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LM239DR2 bảng dữ liệu(PDF) 4 Page - ON Semiconductor |
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LM239DR2 bảng dữ liệu(HTML) 4 Page - ON Semiconductor |
4 / 8 page LM339, LM339A, LM239, LM239A, LM2901, M2901V, MC3302 http://onsemi.com 4 Figure 7. Driving Logic Figure 8. Squarewave Oscillator Logic Device VCC (V) RL k Ω CMOS TTL 1/4 MC14001 1/4 MC7400 +15 +5.0 100 10 RS = Source Resistance R1 ] RS T1 = T2 = 0.69 RC f [ 7.2 C( µF) R2 = R3 = R4 R1 [ R2 // R3 // R4 – + + – VCC Vin Vref VCC ≥ 4.0 V VCC + C 330 k R4 330 k R3 R1 100 k 10 k R1 T1 T2 VCC VO RS RL R2 330 k APPLICATIONS INFORMATION These quad comparators feature high gain, wide bandwidth characteristics. This gives the device oscillation tendencies if the outputs are capacitively coupled to the inputs via stray capacitance. This oscillation manifests itself during output transitions (VOL to VOH). To alleviate this situation input resistors < 10 k Ω should be used. The addition of positive feedback (< 10 mV) is also recommended. It is good design practice to ground all unused input pins. Differential input voltages may be larger than supply voltages without damaging the comparator’s inputs. Voltages more negative than –300 mV should not be used. 10 Figure 9. Zero Crossing Detector (Single Supply) Figure 10. Zero Crossing Detector (Split Supplies) Vin(min) ≈ 0.4 V peak for 1% phase distortion (∆Θ). D1 prevents input from going negative by more than 0.6 V. R1 + R2 = R3 R3 ≤ R5 for small error in zero crossing Vin 10 k D1 R1 8.2 k 6.8 k R2 15 k R3 +15 V * Θ VCC 10 k Vin VEE Vin Vin(min) VCC VO VEE ∆Θ Θ * ) 10 M R5 220 k R4 220 k VO VO + |
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