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OPA622 Datasheet(PDF) 14 Page - Texas Instruments |
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OPA622 Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 19 page  OPA622 14 ® gain) at low closed-loop gains. Harmonic distortion is also improved with increased open-loop gain. Figure 12 shows the OPA622 frequency response at GCL = +2V/V and variable ROG to demonstrate its influence on a flat frequency response. Slight variation of ROG might be necessary to compensate for load capacitance. It is possible to achieve optimal pulse response over a wide range of load capacitances without overshooting and ringing. As an example, Figure 13 shows a selection curve for the optimal ROG value versus the load capacitance at a gain (GCLO) of +2V/V. THERMAL CONSIDERATIONS The OPA622 does not require a heat sink for operation in most environments. A heat sink will, however, 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 PD = PDQ + PDL, (PDQ is the quiescent power dissipation and PDL is the power dissi- pation in the output stage due to the load). Although the PDQ is very low (50mW at VCC = ±5V), care should be taken FIGURE 8. Bandwidth vs Output Voltage (Current-Feedback Amplifier). –1 R 2 R 1 R OG g m g m +In 4 13 8 10 3 9 R T C T V OUT T D –In FIGURE 9. Hybrid Model of a Wideband Op Amp. FIGURE 10. Open-Loop Gain vs R OG. 60 50 40 30 20 10 0 –10 –20 Frequency (Hz) 10k 100k 1M 10M 100M 1G 0 Ω 27Ω 150Ω 390Ω R OG = 20 15 10 5 0 –5 –10 –15 –20 –25 dB Frequency (HZ) 1M 10M 100M 1G 3G 0.6Vp-p 2.8Vp-p 1.4Vp-p 0.2Vp-p 150 Ω 8 +1 1k 20 15 10 5 0 –5 –10 –15 –20 –25 dB Frequency (HZ) 1M 10M 100M 1G 3G 0.6Vp-p 2.8Vp-p 1.4Vp-p 0.2Vp-p 5.0Vp-p 150 Ω 9 +1 150 Ω 8 180 Ω 180 Ω 0.5pF 10 + 13 3 – 4 G CL = +2V/V FIGURE 7. Bandwidth vs Output Voltage (Feedback Buffer ). time constants. The elements R and COTA between the current source output and the output buffer form the first open-loop pole TC. The signal delay time, TD, modelled in the output buffer, combines several small phase-shifting time constants and delay times. They are distributed through- out the amplifier and are also present in the feedback loop. As shown in Figure 10, an increasing ROG leads to a decreasing open-loop gain. The ratio of the two time con- stants, TC and TD, of the open-loop frequency response also determines the product GOL • GCL for optimal closed-loop frequency response. GOL = G+CL • TC and TD are fixed by the op amp design. The purpose of ROG now is to vary GOL versus GCL to keep the product GOL • GCL constant, which is the theoretical condition for optimal and gain-independent frequency response. Figure 11 summarizes some optimal flat closed-loop responses and indicates the ROG values. It should be noted that the bandwidth remains rela- tively constant and ROG has its highest value (low open-loop T C 2T D |
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