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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD822ARMZ датащи(PDF) 19 Page - Analog Devices |
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AD822ARMZ датащи(HTML) 19 Page - Analog Devices |
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19 / 24 page  Data Sheet AD822 Rev. J | Page 19 of 24 90 .... .... .... .... . ... .. .. .. .. .... .... . ... .... .... .... .... . ... .... .... .... . ... .... 100 0% 10 20mV 2µs Figure 44. Small Signal Response of AD822 as Unity-Gain Follower Driving 350 pF Figure 45 is a plot of noise gain vs. capacitive load that results in a 20° phase margin for the AD822. Noise gain is the inverse of the feedback attenuation factor provided by the feedback network in use. 1 2 3 4 5 300 1k 3k 10k 30k CAPACITIVE LOAD FOR 20° PHASE MARGIN (pF) R1 RF CL Figure 45. Noise Gain vs. Capacitive Load Tolerance Figure 46 shows a method for extending capacitance load drive capability for a unity-gain follower. With these component values, the circuit drives 5000 pF with a 10% overshoot. 20pF 100Ω 20kΩ 8 4 VIN V+ 0.01µF VOUT 0.01µF CL 1/2 AD822 + – V– Figure 46. Extending Unity-Gain Follower Capacitive Load Capability Beyond 350 pF SINGLE-SUPPLY VOLTAGE TO FREQUENCY CONVERTER The circuit shown in Figure 47 uses the AD822 to drive a low power timer that produces a stable pulse of width t1. The positive going output pulse is integrated by R1 and C1 and used as one input to the AD822 that is connected as a differential integrator. The other input (nonloading) is the unknown voltage, VIN. The AD822 output drives the timer trigger input, closing the overall feedback loop. 2 3 4 6 5 U3A U3B C3 0.1µF 1 2 3 4 OUT2 OUT1 U1 C1 U2 CMOS 555 THR TR DIS GND OUT CV 1 2 3 4 5 6 7 8 RV+ C4 0.01µF R3 116kΩ 0.01µF, 2% CMOS 74HCO4 RSCALE 10kΩ U4 REF02 VREF = 5V 10V C5 0.1µF R2 499kΩ 1% R1 499kΩ 1% VIN C2 0.01µF 2% 0V TO 2.5V FULL SCALE 1/2 AD822B + – NOTES 1. fOUT = VIN/(VREF × t1), t1 = 1.1 × R3 × C6. 2. R3 = 1% METAL FILM <50ppm/°C TC. 3. RSCALE = 10% 20T FILM <100ppm/°C TC. 4. t1 = 33µF FOR fOUT = 20kHz @ VIN = 2.0V. = 25kHz fS AS SHOWN. Figure 47. Single-Supply Voltage to Frequency Converter Typical AD822 bias currents of 2 pA allow MΩ range source impedances with negligible dc errors. Linearity errors on the order of 0.01% full scale can be achieved with this circuit. This performance is obtained with a 5 V single supply that delivers less than 1 mA to the entire circuit. |
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