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AD790BQ Datasheet(PDF) 7 Page - Analog Devices |
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AD790BQ Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page AD790 REV. D –7– AD790 1 2 3 4 5 6 7 8 +IN –IN 5V + OUT 510 Ω + 12V 0.1µF 0.1µF +V S = +12V, –VS = 0V V LOGIC = +5V AD790 1 2 3 4 5 6 7 8 5V + OUT 15V – 0.1µF 0.1µF +V S = +5V, –VS = –15V V LOGIC = +5V +IN –IN AD790 1 2 3 4 5 6 7 8 5V + OUT 5V – 0.1µF 0.1µF +IN –IN +V S = +5V, –VS = –5V, VLOGIC = +5V Figure 7. Typical Power Supply Connections (N, Q Package Pinout) Window Comparator for Overvoltage Detection The wide differential input range of the AD790 makes it suitable for monitoring large amplitude signals. The simple overvoltage detection circuit shown in Figure 8 illustrates direct connection of the input signal to the high impedance inputs of the comparator without the need for special clamp diodes to limit the differen- tial input voltage across the inputs. 510 Ω OVERRANGE = 1 7432 AD790 1 2 3 4 5 6 7 8 +15V +5V –15V AD790 1 2 3 4 5 6 7 8 +15V +5V –15V VIN 510 Ω 0.1µF 0.1µF 0.1µF 0.1µF 0.1µF 0.1µF SIGN 1 = HIGH 0 = LOW –7.5V +7.5V Figure 8. Overvoltage Detector (N, Q Package Pinout) Single Supply Ground Referred Overload Detector The AD790 is useful as an overload detector for sensitive loads that must be powered from a single supply. A simple ground referenced overload detector is shown in Figure 8. The com- parator senses a voltage across a PC board trace and compares that to a reference (trip) voltage established by the comparator’s minus supply current through a 2.7 Ω resistor. This sets up a 10 mV reference level that is compared to the sense voltage. Applying the –7– The minus supply current is proportional to absolute tempera- ture and compensates for the change in the sense resistance with temperature. The width and length of the PC board trace determine the resistance of the trace and consequently the trip current level. ILIMIT = 10 mV/RSENSE RSENSE = rho (trace length/trace width) rho = resistance of a unit square of trace L O A D 2.7 PC BOARD TRACE AD790 1 2 3 4 5 6 7 8 0.1µF 5V + OUTPUT RSENSE ≈ 10mV/100mA +VS 510 Ω Ω Figure 9. Ground Referred Overload Detector Circuit (N, Q Package Pinout) Precision Full-Wave Rectifier The high speed and precision of the AD790 make it suitable for use in the wide dynamic range full-wave rectifier shown in Figure 10. This circuit is capable of rectifying low level signals as small as a few mV or as high as 10 V. Input resolution, propaga- tion delay and op amp settling will ultimately limit the maximum input frequency for a given accuracy level. Total comparator plus switch delay is approximately 100 ns, which limits the maximum input frequency to 1 MHz for clean rectification. AD711 10k FET SWITCHES THE GAIN FROM +1 TO –1 20k 10k AD790 1 2 3 4 5 6 7 8 +15V +5V –15V 2 3 4 6 7 +15V –15V VIN VOUT NMOS FET (RON < 20 ) 0.1µF 510 0.1µF 0.1µF 0.1µF 0.1µF Ω Ω Ω Ω Ω Figure 10. Precision Full-Wave Rectifier (N, Q Package Pinout) |
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