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OPA623 Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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OPA623 Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 15 page 11 ® OPA623 reduce the internal thermal rise, resulting in cooler, more reliable operation. At extreme temperatures and under full load conditions a heat sink is necessary. The internal power dissipation is given by the equation P D = PDQ + PDL, (PDQ is the quiescent power dissipation and PDL is the power dissipation in the output stage due to the load). Although the PDQ is very low (40mW at VCC = ±5V), care should be taken when a signal is applied. For high-speed op amps, a more precise approach to determine power consumption is to measure the average total quiescent current for several typical load conditions. The power consumption of the OPA623 is influenced by the kind of signal, the applied signal frequency, the output voltage, load resistor, and the repetition rate of the signal transitions. Figure 8 shows the average supply current versus the frequency of an applied sine wave for various output voltages. Figure 9 illustrates the average supply current versus the repetition frequency of an applied square wave signal. FIGURE 5. Open-Loop Gain vs R2 || R1. 50 40 30 20 10 0 –10 –20 –30 Frequency (Hz) 100k 1M 10M 100M 1G 300 Ω 150 Ω 27 Ω 1M 10M 100M 1G Frequency (Hz) FREQUENCY RESPONSE vs C LOAD G CL = +2V/V, VIN = 1.4Vp-p 10pF 22pF 47pF 100k 2pF 51 Ω DUT 50 Ω R 2 C L R 1 3 2 6 R 1 300 Ω 270 Ω 240 Ω 120 Ω R 2 300 Ω 270 Ω 240 Ω 120 Ω C L 2pF 10pF 22pF 47pF FIGURE 7. Frequency Response vs CLOAD. 10k 100k 1M 10M 100M 1G Frequency (Hz) 50 45 40 35 30 25 20 15 10 5 0 Sine Curve R L = 100Ω G = +2V/V C L = 2pF 5.0Vp-p 2.8Vp-p 1.4Vp-p 0.2Vp-p FIGURE 8. Average Supply Current vs Frequency (sinewave). FIGURE 6. Optimum Frequency Response vs Closed-Loop Gain. 20 15 10 5 0 –5 –10 –15 –20 –25 –30 Frequency (Hz) 100k 1M 10M 100M 1G +10V/V +2V/V +1V/V –1V/V 25 20 15 10 5 0 10k 100k 1M 10M 100M Frequency (Hz) 5.0Vp-p 2.8Vp-p 1.4Vp-p 0.2Vp-p G = +2V/V C L = 2pF R L = 100Ω FIGURE 9. Average Supply Current vs Frequency (squarewave). |
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