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AD736ARZ-R7 데이터시트(PDF) 10 Page - Analog Devices |
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AD736ARZ-R7 데이터시트(HTML) 10 Page - Analog Devices |
10 / 20 page AD736 Data Sheet Rev. I | Page 10 of 20 THEORY OF OPERATION AC COUPLED CC = 10µF 8kΩ INPUT AMPLIFIER IB<10pA FULL-WAVE RECTIFIER RMS TRANSLINEAR CORE −VS CAV +VS COM 1 2 3 4 VIN 5 CAV 33µF CF OUTPUT 6 7 CF 8 + + 8k Ω (OPTIONAL LPF ) DC + COUPLED AD736 0.1µF TO COM PIN 0.1µF 10µF OUTPUT AMPLIFIER BIAS SECTION CC Figure 18. AD736 True RMS Circuit As shown by Figure 18, the AD736 has five functional subsections: the input amplifier, full-wave rectifier (FWR), rms core, output amplifier, and bias section. The FET input amplifier allows both a high impedance, buffered input (Pin 2) and a low impedance, wide dynamic range input (Pin 1). The high impedance input, with its low input bias current, is well suited for use with high impedance input attenuators. The output of the input amplifier drives a full-wave precision rectifier that, in turn, drives the rms core. The essential rms operations of squaring, averaging, and square rooting are performed in the core using an external averaging capacitor, CAV. Without CAV, the rectified input signal travels through the core unprocessed, as is done with the average responding connection (see Figure 19). A final subsection, an output amplifier, buffers the output from the core and allows optional low-pass filtering to be performed via the external capacitor, CF, which is connected across the feedback path of the amplifier. In the average responding connection, this is where all of the averaging is carried out. In the rms circuit, this additional filtering stage helps reduce any output ripple that was not removed by the averaging capacitor, CAV. TYPES OF AC MEASUREMENT The AD736 is capable of measuring ac signals by operating as either an average responding converter or a true rms-to-dc converter. As its name implies, an average responding converter computes the average absolute value of an ac (or ac and dc) voltage or current by full-wave rectifying and low-pass filtering the input signal; this approximates the average. The resulting output, a dc average level, is scaled by adding (or reducing) gain; this scale factor converts the dc average reading to an rms equivalent value for the waveform being measured. For example, the average absolute value of a sine wave voltage is 0.636 times VPEAK; the corresponding rms value is 0.707 × VPEAK. Therefore, for sine wave voltages, the required scale factor is 1.11 (0.707/0.636). In contrast to measuring the average value, true rms measurement is a universal language among waveforms, allowing the magnitudes of all types of voltage (or current) waveforms to be compared to one another and to dc. RMS is a direct measure of the power or heating value of an ac voltage compared to that of a dc voltage; an ac signal of 1 V rms produces the same amount of heat in a resistor as a 1 V dc signal. |
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