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AD637JRZ-R7 数据表(PDF) 18 Page - Analog Devices |
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AD637JRZ-R7 数据表(HTML) 18 Page - Analog Devices |
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18 / 25 page ![]() AD637 Data Sheet dB CALIBRATION Refer to Figure 20: • Set VIN = 1.00 V dc or 1.00 V rms • Adjust R1 for 0 dB output = 0.00 V • Set VIN = 0.1 V dc or 0.10 V rms • Adjust R2 for dB output = −2.00 V Any other dB reference can be used by setting VIN and R1 accordingly. 25kΩ 25kΩ COMMON OUTPUT OFFSET DEN INPUT dB OUTPUT –VS +VS NIC +VS AD508J +2.5V R1 500kΩ 10kΩ 4.7kΩ +VS –VS +VS COMPENSATED dB OUTPUT +100mV/dB BIAS SECTION 0dB ADJUST *1kΩ + 3500ppm SEE TEXT AD707JN +VS R2 5kΩ 33.2kΩ R3 1kΩ* BUFFER AD637 FILTER 1 2 3 4 5 6 7 14 13 12 11 10 9 8 CAV + BUFF OUT BUFF IN NIC CS VIN 1µF SIGNAL INPUT dB SCALE FACTOR ADJUST –VS 60.4Ω 2 3 4 6 7 ABSOLUTE VALUE SQUARER/DIVIDER NIC = NO INTERNAL CONNECTION RMS OUT Figure 20. dB Connection Rev. L | Page 18 of 25 |
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