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5962-8980501IA Datasheet(PDF) 10 Page - Analog Devices |
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5962-8980501IA Datasheet(HTML) 10 Page - Analog Devices |
10 / 17 page Data Sheet AD536A Rev. E | Page 9 of 16 14 13 12 11 10 9 8 1 2 3 4 5 6 7 AD536A 25kΩ ABSOLUTE VALUE SQUARER/ DIVIDER CURRENT MIRROR BUF VIN NC –VS C1, CAV CAV C2 +VS NC NC NC dB COM RL IOUT +VS 4.6V TO 18V EOUT –E +E 2.5V OP77 AD580J R1 500kΩ 0dB REF ADJUST dB SCALE FACTOR ADJUST TEMPERATURE COMPENSATED dB OUTPUT +100mV/dB –VS +VS –VS +VS dB OUT 3mV/dB 1SPECIAL TC COMPENSATION RESISTOR, +3300ppm/°C, PRECISION RESISTOR COMPANY PART NUMBER AT 35 OR PART NUMBER ST35. LINEAR rms OUTPUT R6 24.9kΩ R3 60.4Ω R21 1kΩ R4 33.2kΩ R5 5kΩ BUF OUT BUF IN 0.1µF 7 4 3 6 2 Figure 7. dB Connection 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 of Figure 8 represent the frequency response of the AD536A at input levels from 10 mV rms to 7 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 120 kHz. A 10 mV signal can be measured with 1% of reading additional error (100 µV) up to only 5 kHz. 100k 1M 10M 1k 10k 10 1 0.1 0.01 1% 10% ±3dB FREQUENCY (Hz) 7V rms INPUT 1V rms INPUT 100mV rms INPUT 10mV rms INPUT Figure 8. High Frequency Response AC MEASUREMENT ACCURACY AND CREST FACTOR Crest factor is often overlooked when determining the accuracy of an ac measurement. The definition of crest factor is 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√n). Figure 9 illustrates a curve of reading error for the AD536A for a 1 V rms input signal with crest factors from 1 to 11. A rectan- gular pulse train (pulse width = 100 µs) was used for this test because it is the worst-case waveform for rms measurement (all of the energy is contained in the peaks). The duty cycle and peak amplitude were varied to produce crest factors from 1 to 11 while maintaining a constant 1 V rms input amplitude. η = DUTY CYCLE = CF = 1/√η өIN (rms) = 1 V rms 100µs T өO VP 0 100µs T 1 0 –1 –2 –3 –4 1 2 3 4 5 6 7 8 9 10 11 CREST FACTOR Figure 9. Error vs. Crest Factor 1µs 10µs 100µs 1000µs PULSE WIDTH (µs) 10 1 0.1 1V rms CF = 3 1V rms CF = 10 Figure 10. Error vs. Pulse Width Rectangular Pulse |
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