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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD8541AKS-R2 датащи(PDF) 14 Page - Analog Devices |
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AD8541AKS-R2 датащи(HTML) 14 Page - Analog Devices |
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14 / 20 page  AD8541/AD8542/AD8544 Rev. E | Page 14 of 20 PHOTODIODE APPLICATION The AD854x family has very high impedance with an input bias current typically around 4 pA. This characteristic allows the AD854x op amps to be used in photodiode applications and other applications that require high input impedance. Note that the AD854x has significant voltage offset that can be removed by capacitive coupling or software calibration. Figure 39 illustrates a photodiode or current measurement application. The feedback resistor is limited to 10 MΩ to avoid excessive output offset. Also, note that a resistor is not needed on the noninverting input to cancel bias current offset because the bias current-related output offset is not significant when compared to the voltage offset contribution. For best performance, follow the standard high impedance layout techniques, which include: • Shielding the circuit. • Cleaning the circuit board. • Putting a trace connected to the noninverting input around the inverting input. • Using separate analog and digital power supplies. AD8541 4 6 7 3 2 D OR V+ 2.5VREF C 100pF R 10MΩ 2.5VREF VOUT Figure 39. High Input Impedance Application—Photodiode Amplifier |
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