전자부품 데이터시트 검색엔진 |
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AD606JR-REEL7 데이터시트(PDF) 9 Page - Analog Devices |
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AD606JR-REEL7 데이터시트(HTML) 9 Page - Analog Devices |
9 / 12 page AD606 REV. B –9– Low Frequency Applications With reasonably sized input coupling capacitors and an optional input low-pass filter, the AD606 can operate to frequencies as low as 200 Hz with good log conformance. Figure 8 shows the schematic, with the low-pass filter included in the dashed box. This circuit should be built inside a die cast box and the signal brought in through a coaxial connector. The circuit must also have a low-pass filter to reject the attenuated RF signals that would otherwise be rectified along with the desired signal and be added to the log output. The shielded and filtered circuit has a 90 dB dynamic range, as shown in Figure 9. In this circuit, R4 and R5 form a 20 dB attenuator that extends the input range to 10 V rms. R3 isolates loads from VLOG. Capacitors C1 and C2 (4.7 µF each), R1, R2, and the AD606’s input resistance of 2.5 k Ω form a 100 Hz high-pass filter that is before the AD606; the corner frequency of this filter must be well below the lowest frequency of interest. In addition, the offset-correction loop introduces another pole at low signal levels that is transformed into another high-pass filter because it is in a feedback path. This indicates that there has to be a gradual transition from a 40 dB roll off at low signal levels to a 20 dB roll off at high signal levels, at which point the feedback low pass filter is effectively disabled since the incoming signal swamps the feedback signal. This low-pass filter introduces some attenuation due to R1 and R2 in conjunction with the 2.5 k Ω input resistance of the AD606. To minimize this effect, the value of R1 and R2 should be kept as small as possible–100 Ω is a good value since it bal- ances the need to reduce the attenuation as mentioned above with the requirement for R1 and R2 to be much larger then the impedance of C1 and C2 at the low-pass corner frequency, in our case about 1 MHz. 4 –80 40 3 1 –60 2 020 –20 –40 INPUT SIGNAL – dBm 0 100Hz 3.5V 1kHz – 10MHz 90dB Figure 9. Performance of Low Frequency Circuit at 100 Hz and 1 kHz to 10 MHz (Note Attenuation) C1 4.7 F TO DVM R3 1k +5V AD606JN NC 0.1 F NC C4 4.7 F NC R1 100 LOW-PASS FILTER R2 100 C3 680pF R4 453 20dB ATTENUATOR R5 51.1 AC INPUT C2 4.7 F + + DIECAST BOX NC = NO CONNECT Figure 8. Circuit for Low Frequency Measurements |
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