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OP77FZ Datasheet(PDF) 11 Page - Analog Devices |
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OP77FZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page OP77 Rev. E | Page 11 of 16 APPLICATIONS OP77E R2 1M Ω R4 1M Ω +15V –15V R1 1k Ω R3 1k Ω 7 6 4 2 3 0.1µF 0.1µF Figure 27. Precision High-Gain Differential Amplifier The high gain, gain linearity, CMRR, and low TCVOS of the OP77 make it possible to obtain performance not previously available in single-stage, very high-gain amplifier applications. For best CMR, 2 R 1 R must equal 4 R 3 R . In this example, with a 10 mV differential signal, the maximum errors are as listed in Table 7. Table 7. Maximum Errors Type Amount Common-Mode Voltage 0.01%/V Gain Linearity, Worst Case 0.02% TCVOS 0.003%/°C TCIOS 0.008%/°C +15V –15V RS RF 100 Ω 7 6 4 2 3 0.1µF 0.1µF 10µF OUTPUT INPUT CLOAD OP77 Figure 28. Isolating Large Capacitive Loads This circuit reduces maximum slew rate but allows driving capacitive loads of any size without instability. Because the boon resistor is inside the feedback loop, its effect on output impedance is reduced to insignificance by the high open-loop gain of the OP77. R1 100k Ω R3 1k Ω R4 990 Ω R5 10 Ω 6 2 3 VIN IOUT < 15mA R2 100k Ω OP77 Figure 29. Basic Current Source R1 R3 +15V –15V R4 R5 6 2N2222 2N2907 2 3 VIN R2 OP77 IOUT = VIN ( ) GIVEN R3 = R4 + R5, R1 = R2 R3 R1 – R5 IOUT < 100mA Figure 30. 100 mA Current Source These current sources can supply both positive and negative current into a grounded load. Note that 1 R 3 R 2 R 4 R 5 R 2 R 4 R 5 R Z O + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = 1 And that for ZO to be infinite 2 R 4 R 5 R + must = 1 R 3 R |
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