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AD5372BCPZ датащи(PDF) 17 Page - Analog Devices |
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AD5372BCPZ датащи(HTML) 17 Page - Analog Devices |
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17 / 25 page ![]() Preliminary Technical Data AD5372/AD5373 Rev. P rF | Page 17 of 25 TOGGLE MODE The AD5372/AD5373 has two X2 registers per channel, X2A and X2B, which can be used to switch the DAC output between two levels with ease. This approach greatly reduces the overhead required by a micro-processor which would otherwise have to write to each channel individually. When the user writes to either the X1A ,X2A, M or C registers the calculation engine will take a certain amount of time to calculate the appropriate X2A or X2B values. If the application only requires that the DAC output switch between two levels, such as a data generator, any method which reduces the amount of calculation time encountered is advantageous. For the data generator example the user need only set the high and low levels for each channel once, by writing to the X1A and X1B registers. The values of X2A and X2B will be calculated and stored in their respective registers. The calculation delay therefore only happens during the setup phase, i.e. when programming the initial values. To toggle a DAC output between the two levels it is only required to write to the relevant A/B Select Register to set the MUX2 register bit. Furthermore, since there are 8 MUX2 control bits per register it is possible to update eight channels with a single write. Table 17 shows the bits that correspond to each DAC output. |
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