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OP177 Datasheet(PDF) 10 Page - Analog Devices |
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OP177 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page OP177 Data Sheet Rev. G | Page 10 of 16 PRECISION HIGH GAIN DIFFERENTIAL AMPLIFIER The high gain, gain linearity, CMRR, and low TCVOS of the OP177 make it possible to obtain performance not previously available in single stage, very high gain amplifier applications. See Figure 28. For best CMR, R2 R1 must equal R4 R3 In this example, with a 10 mV differential signal, the maximum errors are listed in Table 6. 0.1µF +15V R1 1kΩ R3 1kΩ R2 1MΩ 0.1µF –15V R4 1MΩ 2 3 7 6 4 OP177 – + Figure 28. Precision High Gain Differential Amplifier Table 6. High Gain Differential Amp Performance Type Amount Common-Mode Voltage 0.1%/V Gain Linearity, Worst Case 0.02% TCVOS 0.0003%/°C TCIOS 0.008%/°C ISOLATING LARGE CAPACITIVE LOADS The circuit shown in Figure 29 reduces maximum slew rate but allows driving capacitive loads of any size without instability. Because the 100 Ωresistor is inside the feedback loop, its effect on output impedance is reduced to insignificance by the high open loop gain of the OP177. – + OP177 0.1µF +15V RS RF 0.1µF –15V 2 3 7 6 4 INPUT 100Ω 10pF CLOAD OUTPUT Figure 29. Isolating Capacitive Loads BILATERAL CURRENT SOURCE The current sources shown in Figure 30 supply both positive and negative currents into a grounded load. Note that R1 R3 R2 R4 R5 R2 R4 R ZO − + + = 1 5 and that for ZO to be infinite R1 R3 must R2 R4 R5 = + PRECISION ABSOLUTE VALUE AMPLIFIER The high gain and low TCVOS assure accurate operation with inputs from microvolts to volts. In this circuit, the signal always appears as a common-mode signal to the op amps (for details, see Figure 31). |
Número de pieza similar - OP177_15 |
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Descripción similar - OP177_15 |
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