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AD706JR-REEL датащи(PDF) 7 Page - Analog Devices |
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AD706JR-REEL датащи(HTML) 7 Page - Analog Devices |
7 / 8 page AD706 REV. C –7– Figure 24 shows an in-amp circuit that has the obvious advan- tage 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: VOUT = (VIN#1 − VIN#2 )1+ R4 R3 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 VIN#1 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 = (VIN#1 – VIN#2) (1+ ) + ( ) FOR R1 = R4, R2 = R3 R4 R3 2R4 RG –VS RP* VIN#2 3 2 8 1 5 6 7 4 Figure 24. A 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 Figure 23a. Unity Gain Inverter Connection Figure 23b. Unity Gain Inverter Large Signal Pulse Response, CL = 1,000 pF Figure 23c. Unity Gain Inverter Small Signal Pulse Response, CL = 100 pF Figure 23d. Unity Gain Inverter Small Signal Pulse Response, CL = 1000 pF 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 = Desired Circuit Gain Table I provides practical 1% resistance values. (Note that without resistor RG, R2 and R3 = 49.9 kΩ/G–1.) Table I. Operating Gains of Amplifiers A1 and A2 and Practical 1% Resistor Values for the Circuit of Figure 24 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. 10k + AD706 + 0.1µF 8 4 VIN VOUT – +VS 10k CL 1/2 0.1 F RL 2.5k SQUARE WAVE INPUT –VS |
Аналогичный номер детали - AD706JR-REEL |
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Аналогичное описание - AD706JR-REEL |
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