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OP270EZ データシート(PDF) 9 Page - Analog Devices |
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OP270EZ データシート(HTML) 9 Page - Analog Devices |
9 / 16 page REV. C OP270 –9– RS – SOURCE RESISTANCE ( ) 100 100 1k 10k 100k 1 10 RESISTOR NOISE ONLY OP200 OP270 Figure 4. Total Noise vs. Source Resistance (Including Resistor Noise) at 10 Hz RS – SOURCE RESISTANCE ( ) 1000 100 1k 10k 100k 10 100 RESISTOR NOISE ONLY OP200 OP270 Figure 5. Peak-to-Peak Noise (0.1 Hz to 10 Hz) vs. Source Resistance (Includes Resistor Noise) Figure 5 shows peak-to-peak noise versus source resistance over the 0.1 Hz to 10 Hz range. Once again, at low values of RS, the voltage noise of the OP270 is the major contributor to peak-to-peak noise, with current noise the major contributor as RS increases. The crossover point between the OP270 and the OP200 for peak-to-peak noise is at RS =17k W. The OP271 is a higher speed version of the OP270, with a slew rate of 8 V/ ms. Noise of the OP271 is slightly higher than that of the OP270. Like the OP270, the OP271 is unity-gain stable. For reference, typical source resistances of some signal sources are listed in Table I. Table I. Source Device Impedance Comments Strain gage <500 W Typically used in low frequency applications. Magnetic <1500 W Low IB very important to reduce tapehead, self-magnetization problems microphone when direct coupling is used. OP270 IB can be neglected. Magnetic <1500 W Similar need for low IB in phonograph direct coupled applications. cartridge OP270 will not introduce any self-magnetization problem. Linear variable <1500 W Used in rugged servo-feedback differential applications. Bandwidth of transformer interest is 400 Hz to 5 kHz. R1 5 R2 5 OP270 DUT – + R3 1.24k OP27E – + R4 200 R5 909 C1 2 F R6 600 R8 10k D1, D2 1N4148 OP27E – + R9 306k C2 0.032 F R10 65.4k R11 65.4k C4 0.22 F C3 0.22 F OP42E – + R12 10k R13 5.9k R14 4.99k C5 1 F eOUT GAIN = 50,000 VS = 15V Figure 6. Peak-to-Peak Voltage Noise Test Circuit (0.1 Hz to 10 Hz) |
同様の部品番号 - OP270EZ |
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同様の説明 - OP270EZ |
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