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LMV321 数据表(PDF) 11 Page - ON Semiconductor |
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LMV321 数据表(HTML) 11 Page - ON Semiconductor |
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11 / 20 page ![]() LMV321, LMV358, LMV324 www.onsemi.com 11 APPLICATIONS + − R1 R2 VO Vref Vin VOH VO VOL Hysteresis VinL VinH Vref MC1403 LMV321 − + R1 VCC VCC VO 2.5 V R2 50 k 10 k Vref 5.0 k R C R C + − VO For: fo = 1.0 kHz R = 16 k W C = 0.01 mF VCC LMV321 LMV321 Figure 28. Voltage Reference Figure 29. Wien Bridge Oscillator Figure 30. Comparator with Hysteresis V O + 2.5 V(1 ) R1 R2 ) V ref + 1 2 V CC f O + 1 2 pRC V inL + R1 R1 ) R2 (V OL * Vref) ) Vref V inH + R1 R1 ) R2 (V OH * Vref) ) Vref H + R1 R1 ) R2 (V OH * VOL) For less than 10% error from operational amplifier, ((QO fO)/BW) < 0.1 where fo and BW are expressed in Hz. If source impedance varies, filter may be preceded with voltage follower buffer to stabilize filter parameters. Given: fo = center frequency A(fo) = gain at center frequency Choose value fo, C Vin Figure 31. Multiple Feedback Bandpass Filter − + VCC R3 R1 R2 Vref C C VO CO = 10 C CO LMV321 Then : R3 + Q pf O C R1 + R3 2A(f O) R2 + R1 R3 4Q2 R1 * R3 |
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