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AD705JN 데이터시트(PDF) 7 Page - Analog Devices |
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AD705JN 데이터시트(HTML) 7 Page - Analog Devices |
7 / 8 page AD705 REV. B –7– A High Performance Differential Amplifier Circuit Figure 25 shows a high input impedance, differential amplifier circuit that features a high common-mode voltage, and which operates at low power. Table I details its performance with changes in gain. To optimize the common-mode rejection of this circuit at low frequencies and dc, apply a 1 volt, 1 Hz sine wave to both inputs. Measuring the output with an oscilloscope, adjust trimming potentiometer R6 for minimum output. For the best CMR at higher frequencies, capacitor C2 should be replaced with a 1.5 pF to 20 pF trimmer capacitor. Both the IC socket and any standoffs at the op amp’s input ter- minals should be made of Teflon* to maintain low input current drift over temperature. *Teflon is a registered trademark of E.I. DuPont, Co. 6 4 0.1µF –VS 7 0.1µF +VS 2 3 AD705 VOUT R2 10M Ω C1 5pF R3 200k Ω R5 * R4 * DC CMR ADJUST R6 500k Ω C2 5pF R2' 10M Ω R1' 100M Ω R1 100M Ω SOURCE GND VIN– VIN+ CIRCUIT GAIN, G = – (1+ ) R2+R3 R1 R5 R4 VOUT = G (VIN– – VIN+) COMMON MODE INPUT RANGE = 10 (VS – 1.5V) FOR VS = ±15V, VCM RANGE = ±135V RESISTORS R1 AND R1', R2 AND R2' ARE VICTOREEN MOX-200 1/4 WATT, 1% METAL OXIDE. *SEE TABLE I WARNING: POTENTIAL DANGER FROM HIGH SOURCE VOLTAGE. THIS DIFFERENTIAL AMPLIFIER DOES NOT PROVIDE GALVANIC ISOLATION. INPUT SOURCE MUST BE REFERRED TO THE SAME GROUND CONNECTION AS THIS AMPLIFIER. Figure 25. A High Performance Differentials Amplifier Circuit Table I. Typical Performance of Differential Amplifier Circuit Operating at Various Gains Circuit R4 R5 Trimmed RTI Average Circuit Gain ( )( ) DC CMR Drift TC Bandwidth (dB) ( V/ C) –3 dB 1 1.13 k Ω 10 kΩ≥85 30 4.4 kHz 10 100 Ω 9.76 k Ω≥85 30 2.8 kHz 100 10.2 Ω 10 k Ω≥85 30 930 Hz 100 90 10 0% 5µs 20mV Figure 22d. Unity Gain Inverter Small Signal Pulse Response C, = 1000 pF 6 4 0.1µF –VS 7 0.1µF +VS 2 3 AD705 VOUT VIN SQUARE WAVE INPUT 10k Ω 5k Ω 10pF * 5 *RESPONSE IS NEARLY IDENTICAL FOR CAPACITANCE VALUES OF 0 TO 100pF 4.1nF Figure 23a. Follower Connected in Feed-Forward Mode 100 90 10 0% 5V 5µs 5V INPUT OUTPUT Figure 23b. Follower Feed-Forward Pulse Response 6 5 8 4 1 2 3 7 AD705 OVERCOMPENSATION CAPACITOR 0.1µF +VS 20k Ω VOS ADJUST –VS 0.1µF Figure 24. Offset Null and Overcompensation Connections |
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