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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD636 датащи(PDF) 13 Page - Analog Devices |
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AD636 датащи(HTML) 13 Page - Analog Devices |
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13 / 16 page  Data Sheet AD636 Rev. E | Page 13 of 16 Frequency Response ±3 dBm Input 0 dBm = 5 Hz to 380 kHz −10 dBm = 5 Hz to 370 kHz −20 dBm = 5 Hz to 240 kHz −30 dBm = 5 Hz to 100 kHz −40 dBm = 5 Hz to 45 kHz −50 dBm = 5 Hz to 17 kHz Calibration First, calibrate the 0 dB reference level by applying a 1 kHz sine wave from an audio oscillator at the desired 0 dB amplitude. This can be anywhere from 0 dBm (770 mV rms − 2.2 V p-p) to −20 dBm (77 mV rms − 220 mV p-p). Adjust the IREF calibration trimmer for a zero indication on the analog meter. Then, calibrate the meter scale factor or gain. Apply an input signal −40 dB below the set 0 dB reference and adjust the scale factor calibration trimmer for a 40 μA reading on the analog meter. The temperature compensation resistors for this circuit can be purchased from Micro-Ohm Corporation, 1088 Hamilton Rd., Duarte, CA 91010, Part #Type 401F, 2 kΩ ,1% + 3500 ppm/°C. R2 900kΩ 1 2 3 4 5 6 7 AD636 14 13 12 11 10 9 8 BUF + – + – + + – +VDD REF HI REF LO COM HI LO + – + ON OFF LXD 7543 LIN dB LIN dB LIN dB 200mV 2V 20V 200V COM VIN R1 9MΩ R3 90kΩ R4 10kΩ C3 0.02µF R5 47kΩ 1W 10% D1 1N4148 C4 2.2µF R6 1MΩ ABSOLUTE VALUE SQUARER DIVIDER CURRENT MIRROR 6.8µF R7 20kΩ D4 1N4148 10kΩ 10kΩ C7 6.8µF D2 1N4148 R8 2.49kΩ +VS R9 100kΩ 0dB SET R10 20kΩ D3 1.2V AD589 LIN SCALE R15 1MΩ C6 0.01µF –VS –VSS ANALOG IN 3-1/2 DIGIT 7106 TYPE A/D CONVERTER +VDD –VSS 9V BATTERY 1µF R11 10kΩ R12 1kΩ R13 500Ω R14 10kΩ dB SCALE 3-1/2 DIGIT LCD DISPLAY VIN NC –VS CAV dB BUF OUT BUF IN +VS NC NC NC COM RL IOUT NC = NO CONNECT Figure 17. Portable, High-Z Input, RMS DPM and dB Meter Circuit ALL RESISTORS 1/4W 1% METAL FILM UNLESS OTHERWISE STATED EXCEPT *WHICH IS 2kΩ +3500ppm 1% TC RESISTOR. 1 2 3 4 5 6 7 AD636 14 13 12 11 10 9 8 BUF + – + – + – µA776 + – + + + + ON/OFF 9V +1.2V AD589J 250µA 100µA + +4.2V –4.8V D1 1N6263 SIGNAL INPUT C4 0.1µF R8 47kΩ 1W D2 1N6263 C1 3.3µF R1 1MΩ C2 6.8µF 10kΩ 10kΩ R9 10kΩ ABSOLUTE VALUE SQUARER DIVIDER CURRENT MIRROR R2 12.7kΩ C3 10µF C5 10µF R10 20kΩ C6 0.1µF *R7 2kΩ R6 100Ω R3 5kΩ R4 500kΩ IREF ADJUST R11 820kΩ 5% 0–50µA R5 10kΩ SCALE FACTOR ADJUST 2 3 4 8 7 6 NC = NO CONNECT VIN NC –VS CAV dB BUF OUT BUF IN +VS NC NC NC COM RL IOUT Figure 18. Low Power, High Input Impedance dB Meter |
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