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OP97FS-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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OP97FS-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page OP97 Rev. F | Page 11 of 16 APPLICATION INFORMATION The OP97 is a low power alternative to the industry-standard precision op amp, the OP07. The OP97 can be substituted directly into OP07, OP77, AD725, and PM1012 sockets with improved performance and/or less power dissipation and can be inserted into sockets conforming to the 741 pinout if nulling circuitry is not used. Generally, nulling circuitry used with earlier generation amplifiers is rendered superfluous by the extremely low offset voltage of the OP97 and can be removed without compromising circuit performance. Extremely low bias current over the full military temperature range makes the OP97 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 OP97. Offset voltage and TCVOS are degraded only minimally by high source resistance, even when unbalanced. The input pins of the OP97 are protected against large differential voltage by back-to-back diodes. Current-limiting resistors are not used to maintain low noise performance. If differential voltages above ±1 V are expected at the inputs, series resistors must be used to limit the current flow to a maximum of 10 mA. Common-mode voltages at the inputs are not restricted and may vary over the full range of the supply voltages used. The OP97 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. Offset nulling is achieved utilizing the same circuitry as an OP07. A potentiometer between 5 kΩ and 100 kΩ is connected between Pin 1 and Pin 8 with the wiper connected to the positive supply. The trim range is between 300 μV and 850 μV, depending upon the internal trimming of the device. 8 4 7 5 3 6 2 1 OP97 –V COC +V RPOT = 5kΩ TO 100kΩ Figure 29. Optional Input Offset Voltage Nulling and Overcompensation Circuit |
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