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AD648KR-REEL7 Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD648KR-REEL7 Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 12 page AD648 REV. C –9– INSTRUMENTATION AMPLIFIER The AD648J’s maximum input current of 20 pA per amplifier makes it an excellent building block for the high input imped- ance instrumentation amplifier shown in Figure 29. Total cur- rent drain for this circuit is under 600 µA. This configuration is optimal for conditioning differential voltages from high imped- ance sources. The overall gain of the circuit is controlled by RG, resulting in the following transfer function: VOUT VIN = 1+ (R3 + R4) RG Gains of 1 to 100 can be accommodated with gain nonlinearities of less than 0.01%. The maximum input current is 30 pA over the common-mode range, with a common-mode impedance of over 1 × 1012Ω. The capacitors C1, C2, C3 and C4 compensate for peaking in the gain over frequency which is caused by input capacitance. To calibrate this circuit, first adjust trimmer R1 for common- mode rejection with +10 volts dc applied to the input pins. Next, adjust R2 for zero offset at VOUT with both inputs grounded. Trim the circuit a second time for optimal performance. The –3 dB small signal bandwidth for this low power instru- mentation amplifier is 700 kHz for a gain of 1 and 10 kHz for a gain of 100. The typical output slew rate is 1.8 V/ µs. Figure 29. Low Power Instrumentation Amplifier |
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