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AD822ARMZ-R2 数据表(PDF) 22 Page - Analog Devices |
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AD822ARMZ-R2 数据表(HTML) 22 Page - Analog Devices |
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22 / 28 page  AD822 Rev. G | Page 22 of 28 APPLICATIONS 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 − 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. * 3. ** 4. t1 = 10% 20T FILM <100ppm/°C TC. = 33µF FOR fOUT = 20kHz @ VIN = 2.0V. = 1% METAL FILM <50ppm/°C TC. = 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. SINGLE-SUPPLY PROGRAMMABLE GAIN INSTRUMENTATION AMPLIFIER The AD822 can be configured as a single-supply instrumenta- tion amplifier that is able to operate from single supplies down to 3 V or dual supplies up to ±15 V. Using only one AD822 rather than three separate op amps, this circuit is cost and power efficient. The AD822 FET inputs’ 2 pA bias currents minimize offset errors caused by high unbalanced source impedances. An array of precision thin film resistors sets the in amp gain to be either 10 or 100. These resistors are laser trimmed to ratio match to 0.01% and have a maximum differential TC of 5 ppm/°C. Table 6. In-Amp Performance Parameters VS = 3 V, 0 V VS = ±5 V CMRR 74 dB 80 dB Common-Mode Voltage Range −0.2 V to +2 V −5.2 V to +4 V 3 dB BW, G = 10 180 kHz 180 kHz G = 100 18 kHz 18 kHz tSETTLING 2 V Step (VS = 0 V, 3 V) 2 μs 5 V (VS = ±5 V) 5 μs Noise @ f = 1 kHz, G = 10 270 nV/√Hz 270 nV/√Hz G = 100 2.2 μV/√Hz 2.2 μV/√Hz ISUPPLY (Total) 1.10 mA 1.15 mA 90 100 10 0% .... .... .... .... . .. ... .... . ... . ... . ... .... .... .... .... . . .. .... .... .... .... . ... 1V 5µs Figure 48. Pulse Response of In-Amp to a 500 mV p-p Input Signal; VS = 5 V, 0 V; Gain = 0 G = 100 G = 100 G = 10 G = 10 1 2 3 4 5 6 7 OHMTEK PART # 1043 R5 9kΩ R4 1kΩ R3 1kΩ R2 9kΩ R1 90kΩ R6 90kΩ VREF +VS 0.1µF 1/2 AD822 1/2 AD822 VOUT VIN1 VIN2 RP 1kΩ RP 1kΩ (G = 10) VOUT = (VIN1 – VIN2)+VREF 1+ R6 R4 + R5 () (G = 100) VOUT = (VIN1 – VIN2)+VREF R5 + R6 R4 1+ () Figure 49. A Single-Supply Programmable Instrumentation Amplifier |
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