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AD636JDZ датащи(PDF) 9 Page - Analog Devices |
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AD636JDZ датащи(HTML) 9 Page - Analog Devices |
9 / 16 page Data Sheet AD636 Rev. E | Page 9 of 16 Figure 4 shows the value of REXTERNAL for a particular ratio of VPEAK to −VS for several values of RLOAD. The addition of REXTERNAL increases the quiescent current of the buffer amplifier by an amount equal to REXT/−VS. Nominal buffer quiescent current with no REXTERNAL is 30 µA at −VS = −5 V. FREQUENCY RESPONSE The AD636 uses a logarithmic circuit to perform the implicit rms computation. As with any log circuit, bandwidth is proportional to signal level. The solid lines in Figure 5 represent the frequency response of the AD636 at input levels from 1 mV to 1 V rms. The dashed lines indicate the upper frequency limits for 1%, 10%, and ±3 dB of reading additional error. For example, note that a 1 V rms signal produces less than 1% of reading additional error up to 220 kHz. A 10 mV signal can be measured with 1% of reading additional error (100 µV) up to 14 kHz. AC MEASUREMENT ACCURACY AND CREST FACTOR (CF) 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 that 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 6 is a curve of reading error for the AD636 for a 200 mV rms input signal with crest factors from 1 to 7. A rectangular pulse train (pulse width 200 μs) was used for this test because 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 7 while maintaining a constant 200 mV rms input amplitude. |
Аналогичный номер детали - AD636JDZ |
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Аналогичное описание - AD636JDZ |
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