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BUF22821 Datasheet(PDF) 9 Page - Texas Instruments |
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BUF22821 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 31 page  V =V ´ OUT S CODE 1024 BUF12840 www.ti.com SBOS519A – OCTOBER 2010 – REVISED JULY 2011 DAC VOLTAGE OUTPUT CODE Buffer output values are determined by the analog supply voltage (VS) and the decimal value of the binary input code used to program that buffer. The value is calculated using Equation 1: Where: CODE can vary from 0 to 1023. (1) The BUF12840 outputs are capable of a full-scale voltage output change in typically 5 μs, see Figure 9; no intermediate steps are required. The outputs are also capable of a full-scale output change using the BKSEL or LD pin in typically 7 µs, see Figure 8. SOFTWARE DAC OUTPUT UPDATE Because the BUF12840 features a double-buffered register structure, updating the digital-to-analog converter (DAC) register is not the same as updating the DAC output voltage. There are two methods for updating the DAC output voltages. Method 1: Method 1 is used when it is desirable to have the DAC output voltage change immediately after writing to a DAC register. For each write transaction, the master sets data bit 15 to a '1'. The DAC output voltage update occurs after receiving the 16th data bit for the currently-written register, as shown in Figure 11. Method 2: Method 2 is used when it is desirable to have all DAC output voltages change at the same time. First, the master writes to the desired DAC channels with data bit 15 a '0'. Then, when writing the last desired DAC channel, the master sets data bit 15 to a '1'. All DAC channels are updated at the same time after receiving the 16th data bit. Figure 11. Write DAC_OUT Register Timing Copyright © 2010–2011, Texas Instruments Incorporated 9 |
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