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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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DAC703 Fiches technique(PDF) 10 Page - Burr-Brown (TI) |
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DAC703 Fiches technique(HTML) 10 Page - Burr-Brown (TI) |
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10 / 12 page  10 ® DAC701, 702, 703 APPLICATIONS DRIVING AN EXTERNAL OP AMP WITH CURRENT OUTPUT D/AS DAC702 is current output devices and will drive the sum- ming junction of an op amp to produce an output voltage as shown in Figure 9. Use of the internal feedback resistor is required to obtain specified gain accuracy and low gain drift. DAC702 can be scaled for any desired voltage range with an external feedback resistor, but at the expense of increased drifts of up to ±50ppm/°C. The resistors in the DAC702 ratio track to ±1ppm/°C but their absolute TCR may be as high as ±50ppm/°C. An alternative method of scaling the output voltage of the D/A converter and preserving the low gain drift is shown in Figure 10. OUTPUTS LARGER THAN 20V RANGE For output voltage ranges larger than ±10V, a high voltage op amp may be employed with an external feedback resistor. Use I OUT values of ±1mA for bipolar voltage ranges and –2mA for unipolar voltage ranges (see Figure 11). Use protection diodes as shown when a high voltage op amp is used. Common I OUT V OUT R F 5k Ω 4k Ω 0 to 2mA FIGURE 9. External Op Amp Using Internal Feedback Resistors. I OUT V OUT R F 5k Ω 4k Ω 0 to 2mA R 1 I * R 2 * Common R 1 *, R 2 TCR < ±10ppm/°C FIGURE 10. External Op Amp Using Internal and External Feedback Resistors to Maintain Low Gain Drift. FIGURE 11. External Op Amp Using External Feedback Resistors. V OUT R F 4k Ω 0 to 2mA BB3584 R F |
Numéro de pièce similaire - DAC703 |
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Description similaire - DAC703 |
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