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AD536ASCHIPS Datasheet(PDF) 7 Page - Analog Devices |
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AD536ASCHIPS Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page REV. B AD536A –7– FREQUENCY RESPONSE The AD536A utilizes a logarithmic circuit in performing the implicit rms computation. As with any log circuit, bandwidth is proportional to signal level. The solid lines in the graph below represent the frequency response of the AD536A at input levels from 10 millivolts to 7 volts rms. The dashed lines indicate the upper frequency limits for 1%, 10%, and 3 dB of reading addi- tional error. For example, note that a 1 volt rms signal will pro- duce less than 1% of reading additional error up to 120 kHz. A 10 millivolt signal can be measured with 1% of reading addi- tional error (100 µV) up to only 5 kHz. Figure 11. High Frequency Response AC MEASUREMENT ACCURACY AND CREST FACTOR Crest factor is often overlooked in determining the accuracy of an ac measurement. Crest factor is defined as the ratio of the peak signal amplitude to the rms value of the signal (CF = VP/ V rms). Most common waveforms, such as sine and triangle waves, have relatively low crest factors (<2). Waveforms which resemble low duty cycle pulse trains, such as those occurring in switching power supplies and SCR circuits, have high crest factors. For example, a rectangular pulse train with a 1% duty cycle has a crest factor of 10 (CF = 1 η ). Figure 12 is a curve of reading error for the AD536A for a 1 volt rms input signal with crest factors from 1 to 11. A rectangular pulse train (pulsewidth 100 µs) was used for this test since it is the worst-case waveform for rms measurement (all the energy is contained in the peaks). The duty cycle and peak amplitude were varied to produce crest factors from 1 to 11 while main- taining a constant 1 volt rms input amplitude. Figure 12. Error vs. Crest Factor Figure 13. AD536A Error vs. Pulsewidth Rectangular Pulse Figure 14. AD536A Input and Output Voltage Ranges vs. Supply |
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