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OP497GSZ1 Datasheet(PDF) 11 Page - Analog Devices |
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OP497GSZ1 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page OP497 Rev. E | Page 11 of 16 GUARDING AND SHIELDING To maintain the extremely high input impedances of the OP497, care must be taken in circuit board layout and manufacturing. Board surfaces must be kept scrupulously clean and free of moisture. Conformal coating is recommended to provide a humidity barrier. Even a clean PCB can have 100 pA of leakage currents between adjacent traces; therefore, use guard rings around the inputs. Guard traces are operated at a voltage close to that on the inputs, as shown in Figure 34, so that leakage currents become minimal. In noninverting applications, connect the guard ring to the common-mode voltage at the inverting input. In inverting applications, both inputs remain at ground; therefore, the guard trace should be grounded. Place guard traces on both sides of the circuit board. 1/4 OP497 UNITY-GAIN FOLLOWER NONINVERTING AMPLIFIER INVERTING AMPLIFIER B 8 A 1 PDIP BOTTOM VIEW – + – + – + 1/4 OP497 1/4 OP497 Figure 34. Guard Ring Layout and Connections OPEN-LOOP GAIN LINEARITY The OP497 has both an extremely high gain of 2000 V/mV typical and constant gain linearity. This enhances the precision of the OP497 and provides for very high accuracy in high closed-loop gain applications. Figure 35 illustrates the typical open-loop gain linearity of the OP497. OUTPUT VOLTAGE (V) –15 –10 –5 0 5 10 15 RL = 10kΩ VS = ±15V VCM = 0V TA = 25°C TA = 125°C Figure 35. Open-Loop Gain Linearity |
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