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OP97FS Datasheet(PDF) 7 Page - Analog Devices |
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OP97FS Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page REV. D OP97 –7– APPLICATIONS INFORMATION The OP97 is a low power alternative to the industry standard precision op amp, the OP07. The OP97 may be substituted directly into OP07, OP77, 725, 112/312, and 1012 sockets with improved performance and/or less power dissipation, and may 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 OP97’s extremely low offset voltage, and may be removed without com- promising 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 differen- tial voltage by back-to-back diodes. Current-limiting resistors are not used so that low noise performance is maintained. 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 OP97 RPOT = 5k TO 100k COC –V +V Figure 1. Optional Input Offset Voltage Nulling and Overcompensation Circuits Figure 2. Small-Signal Transient Response (CLOAD = 100 pF, AVCL = 1) 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. Offset nulling is achieved utilizing the same circuitry as an OP07. A potentiometer between 5 k Ω and 100 kΩ is connected between pins 1 and 8 with the wiper connected to the positive supply. The trim range is between 300 µV and 850 µV, depend- ing upon the internal trimming of the device. AC PERFORMANCE The OP97’s ac characteristics are highly stable over its full operating temperature range. Unity-gain small-signal response is shown in Figure 2. Extremely tolerant of capacitive loading on the output, the OP97 displays excellent response even with 1000 pF loads (Figure 3). In large-signal applications, the input protection diodes effectively short the input to the output during the transients if the amplifier is connected in the usual unity-gain configuration. The output enters short-circuit current limit, with the flow going through the protection diodes. Improved large-signal transient response is obtained by using a feedback resistor between the output and the inverting input. Figure 4 shows the large-signal response of the OP97 in unity gain with a 10 k Ω feedback resistor. The unity gain follower circuit is shown in Figure 5. The overcompensation pin may be used to increase the phase margin of the OP97, or to decrease gain-bandwidth product at gains greater than 10. Figure 3. Small-Signal Transient Response (CLOAD = 1000 pF, AVCL = 1) Figure 4. Large-Signal Transient Response (AVCL = 1) |
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