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AD547LH bảng dữ liệu(PDF) 10 Page - Analog Devices |
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AD547LH bảng dữ liệu(HTML) 10 Page - Analog Devices |
10 / 12 page AD542/AD544/AD547 REV. B –10– This particular log ratio circuit is free from the dynamic prob- lems that plague many other log circuits. The –3 dB bandwidth is 50 kHz over the top 3 decades, 100 nA to 100 µA, and de- creases smoothly at lower input levels. This circuit needs no ad- ditional frequency compensation for stable operation from input current sources, such as photodiodes, that may have 100 pF of shunt capacitance. For larger input capacitances a 20 pF integration capacitor around each amplifier will provide a smoother frequency response. This log ratio amplifier can be readily adjusted for optimum accuracy by following this simple procedure. First, apply V1 = V2 = –10.00 V and adjust “Balance” for VOUT = 0.00 V. Next apply V1 = –10.00 V, V2 = –1.00 V and adjust gain for VOUT = +1.00 V. Repeat this procedure until gain and balance readings are within 2 mV of ideal values. Figure 35. Low Drift Integrator and Low Leakage Guarded Reset Figure 34. Differentiator Figure 36. Wien-Bridge Oscillator–fO = 10 kHz Figure 37. Capacitance Multiplier Figure 38. Long Interval Timer–1,000 Seconds Figure 39. Positive Peak Detector |
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Mô tả tương tự - AD547LH |
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