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AD834JR датащи(PDF) 4 Page - Analog Devices |
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AD834JR датащи(HTML) 4 Page - Analog Devices |
4 / 8 page AD834–Typical Characteristics REV. C –4– Figure 1. Mean-Square Output vs. Frequency Figure 2. AC Feedthrough vs. Frequency Figure 3. Total Harmonic Distortion vs. Frequency Figure 1. Figure 1 is a plot of the mean-square output versus frequency for the test circuit of Figure 5. Note that the rising response is due to package resonances. Figure 2. For frequencies above 1 MHz, ac feedthrough is dominated by static nonlinearities in the transfer function and the finite offset voltages. The offset voltages cause a small frac- tion of the fundamental to appear at the output, and can be nulled out. Figure 3. THD data represented in Figure 3 is dominated by the second harmonic, and is generated with 0 dBm input on the ac input and +1 V on the dc input. For a given amplitude on the ac input, THD is relatively insensitive to changes in the dc input amplitude. Varying the ac input amplitude while maintaining a constant dc input amplitude will affect THD performance. Figure 4. Test Configuration for Measuring AC Feedthrough and Total Harmonic Distortion Figure 5. The squarer configuration shown in Figure 5 is used to determine wideband performance because it eliminates the need for (and the response uncertainties of) a wideband mea- surement device at the output. The wideband output of a squarer configuration is a fluctuating current at twice the input frequency with a mean value proportional to the square of the input amplitude. By placing capacitors C3/C5 and C4/C6 across load resistors R1 and R2, a simple low-pass filter is formed, and the mean-square value is extracted. The mean-square response can be measured using a DVM connected across R1 and R2. Figure 5. Bandwidth Test Circuit Figure 6. Low Frequency Test Circuit |
Аналогичный номер детали - AD834JR |
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Аналогичное описание - AD834JR |
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