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OP297GS-REEL Datasheet(PDF) 7 Page - Analog Devices |
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OP297GS-REEL Datasheet(HTML) 7 Page - Analog Devices |
7 / 16 page 8/21/97 4:00 PM OP297 –7– REV. D Figure 24. Open Loop Output Impedance vs Frequency APPLICATIONS INFORMATION Extremely low bias current over the full military 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 not necessary 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 differ- ential voltage by back-to-back diodes and current-limiting resis- tors. Common-mode voltages at the inputs are not restricted, and may vary over the full range of the supply voltages used. 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 one volt of either rail. The output typically swings to within one volt of the rails when using a 10 k Ω load. AC PERFORMANCE The OP297’S AC characteristics are highly stable over its full operating temperature range. Unity-gain small-signal response is shown in Figure 25. Extremely tolerant of capacitive loading on the output, the OP297 displays excellent response even with 1000 pF loads (Figure 26). 10 0% 100 90 5µs 20mV Figure 25. Small-Signal Transient Response (CLOAD = 100 pF, AVCL = +1) 10 0% 100 90 5µs 20mV Figure 26. Small-Signal Transient Response (CLOAD = 1000 pF, AVCL = +1) 10 0% 100 90 5µs 20mV Figure 27. Large-Signal Transient Response (AVCL = +1) GUARDING AND SHIELDING To maintain the extremely high input impedances of the OP297, care must be taken in circuit board layout and manu- facturing. Board surfaces must be kept scrupulously clean and free of moisture. Conformal coating is recommended to provide TA = +125°C TA = –55°C GAIN PHASE VS = ±15V CL = 30pF RL = 1MΩ FREQUENCY (Hz) 100 80 60 40 20 0 –20 –40 100 1k 10k 100 1M 10M 90 135 180 225 +EDGE –EDGE TA = +25°C VS = ±15V AVCL = +1 VOUT = 100mVp-p 70 60 50 40 30 20 10 0 LOAD CAPACITANCE (pF) 10 100 1000 10000 TA = +25°C VS = ±15V FREQUENCY (Hz) 1000 100 10 1 0.1 0.01 0.001 10 100 1k 10k 100k 1M Figure 22. Open Loop Gain, Phase vs. Frequency Figure 23. Small Signal Overshoot vs. Capacitance Load |
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