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DALLAS MAX1494 DRIVER
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To help quantify distortion, en- gineers use instruments that detect low-amplitude signals pro- duced by combinations of standard test signals in audio elec- tronics. Intermodulation distortion IMD measurements, for example, compute the ratio of the root-mean-square rms value of two test signals, f and fi, to the rms value of "products" that arise from mixing or modulating the two test signals. Signal Instrument C offers six gain settings. Note the dynamic range varies from one gain setting to the next. Good design and test- ing techniques ensure electronic equipment produces harmonics at low levels, which minimizes distortion. Often, the second-order IMD frequencies exist some distance from fi and f2, but two third-order IMD frequencies occur close to fi and f2.
Thus, filtering can remove second-order IMD com- ponents but not third-order IMD frequencies, which exist too close to fi and f2. The change Dallas MAX1494 amplitude of the test signals fi and f2 also affects the amplitude of the IMD-generated signals.
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An increase of 5 dB in a fundamental frequency increases the amplitude of its second harmonic by 10 dB and the amplitude of its third harmonic Dallas MAX1494 15 dB. To ensure IMD frequencies will not distort audio signals, engineers require audio test equipment that can accurately measure IMD frequencies over as large a dy- namic range as possible.
Dynamic Dallas MAX1494 expresses how well an instrument can detect small signals in the presence or large signals. Because an IMD measurement requires simultaneous measurement of stimulus signals and their low-amplitude harmonics, instruments require a wide Dallas MAX1494 range.
How should Bonnie test her circuit to get quantitative distortion results? The ratio does not specify that an instrument can measure a specific signal.
In many cases, dynamic range will equal an instrument's signal-to- noise ratio because the smallest detectable signal amounts to noise. Audio specifications may refer to an A-weighted dynamic range, which involves measurements on filtered Dallas MAX1494 between 20 Hz and 20 kHz, the range of human hearing. Each setting specifies the maximum signal the instrument can work with, and each setting provides its own dynamic range. Exercise care when you determine the gain for a measurement.
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Say you have a 0. The higher dynamic range of the 1 Dallas MAX1494 setting seems attractive, but do the math and you'll find that range lets you measure only down to about 12 aV. The noise floor of the instrument may hide low-am- plitude harmonics and distortion produced by a device under test. On the other hand, the 1 -V range with a 1 1 3 dB dynamic range lets you measure signals as low as 2 ]iV. Boost power supplies are popular for creating high- er dc voltages from low-voltage inputs. As the power demands from these Dallas MAX1494 increase, however, a single power stage may be insufficient- This article presents an interleaved-boost approach, which, compared with a single-boost converter, both analytically and empirically provides efficien- cy, size, and cost advantages- The article also compares test results of W, single-phase and interleaved-boost power sup- plies.
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The interleaved-boost topology provides superior per- formance, albeit with increased complexity. The motivation for the work this article describes was the selection of a power-supply topology for an ink- jet Dallas MAX1494 sole- noid driver. The input voltage was 12V dc; the required output was 37V dc at 7 A. The supply's input current could exceed 20A.
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It was initially unclear whether a single power stage or a multi- phase stage was most appropriate. The MAX/MAX low-power, and Dallas MAX1494, analog-to-digital For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at.
The MAX EV kit provides a proven PC board layout to facilitate For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at.