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OPA27GU2K5 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA27GU2K5 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 22 page  OPA27, OPA37 9 SBOS135C www.ti.com APPLICATIONS INFORMATION OFFSET VOLTAGE ADJUSTMENT The OPA27 and OPA37 offset voltages are laser-trimmed and require no further trim for most applications. Offset voltage drift will not be degraded when the input offset is nulled with a 10k Ω trim potentiometer. Other potentiometer values from 1k Ω to 1MΩ can be used, but V OS drift will be degraded by an additional 0.1 µV/°C to 0.2µV/°C. Nulling large system offsets by use of the offset trim adjust will degrade drift performance by approximately 3.3 µV/°C per millivolt of offset. Large system offsets can be nulled without drift degradation by input summing. The conventional offset voltage trim circuit is shown in Figure 3. For trimming very small offsets, the higher resolution circuit shown in Figure 4 is recommended. The OPA27 and OPA37 can replace 741-type operational amplifiers by removing or modifying the trim circuit. THERMOELECTRIC POTENTIALS The OPA27 and OPA37 are laser-trimmed to microvolt-level input offset voltages, and for very-low input offset voltage drift. Careful layout and circuit design techniques are necessary to prevent offset and drift errors from external thermoelectric potentials. Dissimilar metal junctions can generate small EMFs if care is not taken to eliminate either their sources (lead-to-PC, wiring, etc.) or their temperature difference (see Figure 11). Short, direct mounting of the OPA27 and OPA37 with close spacing of the input pins is highly recommended. Poor layout can result in circuit drifts and offsets which are an order of magnitude greater than the operational amplifier alone. FIGURE 1. 0.1Hz to 10Hz Noise Test Circuit. FIGURE 2. Low Frequency Noise. DUT OPA111 100k Ω 2k Ω 4.7 µF Voltage Gain Total = 50,000 10 Ω NOTE: All capacitor values are for nonpolarized capacitors only. 0.1 µF Scope x1 R IN = 1MΩ 100k Ω 24.3k Ω 4.3k Ω 110k Ω 0.1 µF 22 µF 2.2 µF 0.1Hz TO 10Hz NOISE 1s/div 40nv/div |
Similar Part No. - OPA27GU2K5 |
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Similar Description - OPA27GU2K5 |
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