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OP275GS Scheda tecnica(PDF) 7 Page - Analog Devices |
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OP275GS Scheda tecnica(HTML) 7 Page - Analog Devices |
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7 / 12 page  –6– OP275 OP275 –7– APPLICATIONS Circuit Protection OP275 has been designed with inherent short-circuit protection to ground. An internal 30 resistor, in series with the output, limits the output current at room temperature to ISC+ = 40 mA and ISC– = –90 mA, typically, with ±15 V supplies. However, shorts to either supply may destroy the device when excessive voltages or currents are applied. If it is possible for a user to short an output to a supply for safe operation, the output current of the OP275 should be design-limited to ±30 mA, as shown in Figure 1. Total Harmonic Distortion Total Harmonic Distortion + Noise (THD + N) of the OP275 is well below 0.001% with any load down to 600 . However, this is dependent upon the peak output swing. In Figure 2, the THD + Noise with 3 V rms output is below 0.001%. In Figure 3, THD + Noise is below 0.001% for the 10 k and 2 k loads but increases to above 0.1% for the 600 load condition. This is a result of the output swing capability of the OP275. Notice the results in Figure 4, showing THD versus VIN (V rms). This figure shows that the THD + Noise remains very low until the output reaches 9.5 V rms. This performance is similar to competitive products. RFB FEEDBACK RX 332 A1 VOUT A1 = 1/2 OP275 – + Figure 1. Recommended Output Short-Circuit Protection RL = 600, 2k, 10k VS = 15V VIN = 3V rms AV = +1 0.010 0.001 0.0005 20 100 1k 10k 20k FREQUENCY – Hz Figure 2.THD + Noise vs. Frequency vs. RLOAD 1 0.001 0.0001 20 100 1k 10k 20k FREQUENCY – Hz AV = +1 VS = 18V VIN = 10V rms 80kHz FILTER 600 2k 10k 0.1 0.010 Figure 3.THD + Noise vs. RLOAD; VIN =10 V rms VS = 18V RL = 600 0.010 0.001 0.0001 0.5 1 10 OUTPUT SWING – V rms Figure 4. Headroom,THD + Noise vs. Output Amplitude (V rms); RLOAD = 600 , VSUP = ±18 V The output of the OP275 is designed to maintain low harmonic distortion while driving 600 loads. However, driving 600 loads with very high output swings results in higher distortion if clipping occurs. A common example of this is in attempting to drive 10 V rms into any load with ±15 V supplies. Clipping will occur and distortion will be very high. To attain low harmonic distortion with large output swings, supply voltages may be increased. Figure 5 shows the performance of the OP275 driving 600 loads with supply voltages varying from ±18 V to ±20 V. Notice that with ±18 V supplies the distortion is fairly high, while with ±20 V supplies it is a very low 0.0007%. SUPPLY VOLTAGE – V 0.0001 0.001 0 17 22 18 19 20 21 0.01 0.1 RL = 600 VOUT = 10V rms @ 1kHz Figure 5.THD + Noise vs. Supply Voltage Noise The voltage noise density of the OP275 is below 7 nV/Hz from 30 Hz.This enables low noise designs to have good performance throughout the full audio range. Figure 6 shows a typical OP275 with a 1/f corner at 2.24 Hz. 10Hz 0Hz CH A: 80.0V FS 10.0V/DIV MKR: 45.6V/ Hz BW: 0.145Hz MKR: 2.24Hz Figure 6. 1/f Noise Corner, VS = ±15 V, AV = 1000 REV. C REV. C |
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