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OP297GSZ-REEL7 Datasheet(PDF) 9 Page - Analog Devices |
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OP297GSZ-REEL7 Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page OP297 Rev. F | Page 9 of 16 APPLICATIONS INFORMATION 5µs 20mV 10 0% 100 90 Extremely low bias current over a wide temperature range makes the OP297 attractive for use in sample-and-hold amplifiers, peak detectors, and log amplifiers that must operate over a wide temperature range. Balancing input resistances is unnecessary with the OP297. Offset voltage and TCVOS are degraded only minimally by high source resistance, even when unbalanced. The input pins of the OP297 are protected against large differen- tial voltage by back-to-back diodes and current-limiting resistors. Common-mode voltages at the inputs are not restricted and can vary over the full range of the supply voltages used. Figure 28. Large Signal Transient Response (A = 1) The OP297 requires very little operating headroom about the supply rails and is specified for operation with supplies as low as 2 V. Typically, the common-mode range extends to within 1 V of either rail. The output typically swings to within 1 V of the rails when using a 10 kΩ load. VCL UNITY-GAIN FOLLOWER – + 1/2 OP297 INVERTING AMPLIFIER – + 1/2 OP297 MINI-DIP BOTTOM VIEW 8 B 1 A NONINVERTING AMPLIFIER – + 1/2 OP297 AC PERFORMANCE The ac characteristics of the OP297 are highly stable over its full operating temperature range. Unity gain small signal response is shown in Figure 26. Extremely tolerant of capacitive loading on the output, the OP297 displays excellent response with 1000 pF loads (see Figure 27). 10 100 90 0% 10 20mV 5µs Figure 29. Guard Ring Layout and Considerations GUARDING AND SHIELDING To maintain the extremely high input impedances of the OP297, care is 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 PC board can have 100 pA of leakage currents between adjacent traces, so guard rings should be used around the inputs. Guard traces operate at a voltage close to that on the inputs, as shown in Figure 26. Small Signal Transient Response (CLOAD = 100 pF, A = 1) VCL 5µs 20mV 10 0% 100 90 Figure 29, to minimize leakage currents. In noninverting applications, the guard ring should be connected to the common-mode voltage at the inverting input. In inverting applications, both inputs remain at ground, so the guard trace should be grounded. Guard traces should be placed on both sides of the circuit board. Figure 27. Small Signal Transient Response (CLOAD = 1000 pF, A = 1) VCL |
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