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AD706AR Datasheet(PDF) 7 Page - Analog Devices |
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AD706AR Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page REV. E AD706 –7– 10k + AD706 + 0.1µF 8 4 VIN VOUT – +VS 10k CL 1/2 0.1 F RL 2.5k SQUARE WAVE INPUT –VS Figure 5a. Unity Gain Inverter Connection Figure 5b. Unity Gain Inverter Large Signal Pulse Response, CL = 1,000 pF Figure 5c. Unity Gain Inverter Small Signal Pulse Response, CL = 100 pF Figure 5d. Unity Gain Inverter Small Signal Pulse Response, CL = 1000 pF Figure 6 shows an in-amp circuit that has the obvious advantage of requiring only one AD706, rather than three op amps, with subsequent savings in cost and power consumption. The transfer function of this circuit (without RG) is VV V R R OUT IN1 IN2 =− + () 1 4 3 for R1 = R4 and R2 = R3. Input resistance is high, thus permitting the signal source to have an unbalanced output impedance. +VS 0.1 F 1k + – A1 AD706 1/2 RP* 1k 49.9k R2 R3 R4 VIN1 RG (OPTIONAL) R1 49.9k A2 + – 0.1 F AD706 1/2 OUTPUT *OPTIONAL INPUT PROTECTION RESISTOR FOR GAINS GREATER THAN 100 OR INPUT VOLTAGES EXCEEDING THE SUPPLY VOLTAGE. VOUT = (VIN1 – VIN2) (1+ ) + ( ) FOR R1 = R4, R2 = R3 R4 R3 2R4 RG –VS RP* VIN2 3 2 8 1 5 6 7 4 Figure 6. Two Op Amp Instrumentation Amplifier Furthermore, the circuit gain may be fine trimmed using an optional trim resistor, RG. Like the three op amp circuit, CMR increases with gain, once initial trimming is accomplished—but CMR is still dependent upon the ratio matching of Resistors R1 through R4. Resistor values for this circuit, using the optional gain resistor, RG, can be calculated using R1 = R4 = 49.9 kΩ R2 = R3 = 49.9 k Ω 0.9 G −1 RG = 99.8 k Ω 0.06 G where G = The desired circuit gain. Table I provides practical 1% resistance values. Note that without resistor RG, R2 and R3 = 49.9 k Ω/G–1. Table I. Operating Gains of Amplifiers A1 and A2 and Practical 1% Resistor Values for the Circuit of Figure 6 Circuit Gain Gain of A1 Gain of A2 R2, R3 R1, R4 1.10 11.00 1.10 499 k Ω 49.9 k Ω 1.33 4.01 1.33 150 k Ω 49.9 k Ω 1.50 3.00 1.50 100 k Ω 49.9 k Ω 2.00 2.00 2.00 49.9 k Ω 49.9 k Ω 10.1 1.11 10.10 5.49 k Ω 49.9 k Ω 101.0 1.01 101.0 499 Ω 49.9 k Ω 1001 1.001 1001 49.9 Ω 49.9 k Ω For a much more comprehensive discussion of in-amp applica- tions, refer to the Instrumentation Amplifier Applications Guide— available free from Analog Devices, Inc. |
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