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OP297FP Datasheet(PDF) 8 Page - Analog Devices |
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OP297FP Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page 8/21/97 4:00 PM OP297 –8– REV. D a humidity barrier. Even a clean PC board can have 100 pA of leakage currents between adjacent traces, so guard rings should be used around the inputs. Guard traces are operated at a volt- age close to that on the inputs, as shown in Figure 28, so that leakage currents become minimal. In noninverting applications, the guard ring should be connected to the common-mode volt- age at the inverting input. In inverting applications, both inputs remain at ground, so the guard trace should be grounded. Guard traces should be on both sides of the circuit board. OPEN-LOOP GAIN LINEARITY The OP297 has both an extremely high gain of 2000 V/mV minimum and constant gain linearity. This enhances the preci- sion of the OP297 and provides for very high accuracy in high closed loop gain applications. Figure 29 illustrates the typical open-loop gain linearity of the OP297 over the military tempera- ture range. TA = +125°C TA = –55°C TA = +25°C RL = 10kΩ VS = ±15V VCM = 0V OUTPUT VOLTAGE (VOLTS) –15 –10 –5 0 5 10 15 Figure 29. Open-Loop Linearity of the OP297 APPLICATIONS PRECISION ABSOLUTE VALUE AMPLIFIER The circuit of Figure 30 is a precision absolute value amplifier with an input impedance of 30 M Ω. The high gain and low TCVOS of the OP297 insure accurate operation with microvolt input signals. In this circuit, the input always appears as a common-mode signal to the op amps. The CMR of the OP297 exceeds 120 dB, yielding an error of less than 2 ppm. + – 0V < VOUT < 10V 7 6 5 R3 1k Ω 1/2 OP-297 R2 2k Ω R1 1k Ω D1 1N4148 D2 1N4148 + – 1/2 OP-297 C1 30pF –15V C3 0.1 µF 4 1 8 2 3 VIN C2 0.1 µF +15V Figure 30. Precision Absolute Value Amplifier PRECISION CURRENT PUMP Maximum output current of the precision current pump shown in Figure 31 is ± 10 mA. Voltage compliance is ± 10 V with ±15 V supplies. Output impedance of the current transmitter exceeds 3 M Ω with linearity better than 16 bits. – + UNITY-GAIN FOLLOWER INVERTING AMPLIFIER NONINVERTING AMPLIFIER 1/2 OP-297 1/2 OP-297 – + MINI-DIP BOTTOM VIEW 1/2 OP-297 – + 1 8 B A Figure 28. Guard Ring Layout and Connections |
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