Datenblatt-Suchmaschine für elektronische Bauteile |
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OP275GSR Datenblatt(PDF) 7 Page - Analog Devices |
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OP275GSR Datenblatt(HTML) 7 Page - Analog Devices |
7 / 12 page OP275 REV. A –7– APPLICATIONS Short Circuit Protection The OP275 has been designed with inherent short circuit pro- tection to ground. An internal 30 Ω 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 out- put 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 Ω. However, this is dependent upon the peak output swing. In Figure 2 it is seen that the THD + Noise with 3 V rms output is below 0.001%. In the following Figure 3, THD + Noise is below 0.001% for the 10 k Ω and 2 kΩ loads but increases to above 0.1% for the 600 Ω load condition. This is a result of the output swing capability of the OP275. Notice the results in Figure 4, showing THD vs. VIN (V rms). This figure shows that the THD + Noise remains very low until the output reaches 9.5 volts rms. This performance is similar to competitive products. RFB FEEDBACK RX 332 Ω A1 VOUT A1 = 1/2 OP275 Figure 1. Recommended Output Short Circuit Protection RL = 600Ω, 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 Ω 2k 10k 0.1 0.010 Figure 3. THD + Noise vs. RLOAD; VIN =10 V rms, ±18 V Supplies VS = ±18V RL = 600Ω 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 Ω, VSUP = ±18 V The output of the OP275 is designed to maintain low harmonic distortion while driving 600 Ω loads. However, driving 600 Ω 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 volt 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 perfor- mance of the OP275 driving 600 Ω loads with supply voltages varying from ±18 volts to ±20 volts. Notice that with ±18 volt supplies the distortion is fairly high, while with ±20 volt 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 = 600Ω VOUT = 10 Vrms @ 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 perfor- mance throughout the full audio range. Figure 6 shows a typical OP275 with a 1/f corner at 2.24 Hz. 10 Hz 0 Hz CH A: 80.0 µV FS 10.0 µV/DIV MKR: 45.6 µV/ √Hz BW: 0.145 Hz MKR: 2.24 Hz Figure 6. 1/f Noise Corner, VS = ±15 V, AV = 1000 |
Ähnliche Teilenummer - OP275GSR |
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Ähnliche Beschreibung - OP275GSR |
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