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DAC1232LIN Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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DAC1232LIN Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 18 page Application Hints (Continued) 14 Left-Justified Data Format It is important to realize that the input registers of these DACs are arranged to accept a left-justified data word from the microprocessor with the most significant 8 bits coming first (Byte 1) and the lower 4 bits second Left justification simply means that the binary point is assumed to be located to the left of the most significant bit Figure 3 shows how the 12 bits of DAC data should be arranged in 2 8-bit registers of an 8-bit processor before being written to the DAC TLH5690-10 X e don’t care FIGURE 3 Left-Justified Data Format 15 16-Bit Data Bus Interface The DAC1208 series provides all 12 digital input lines to permit a direct parallel interface to a 16-bit data bus In this instance double buffering is not always necessary (unless a simultaneous updating of several DACs or a data transfer via an external strobe is desired) so the 12-bit DAC register can be wired to flow-through whereby its Q outputs always reflect the state of its D inputs The external connections required and the timing diagram for this single buffered ap- plication are shown in Figure 4 Note that either left or right- justified data from the processor can be accommodated with a 16-bit data bus 16 Flow-Through Operation Through primarily designed to provide microprocessor inter- face compatibility the MICRO-DACs can easily be config- ured to allow the analog output to continuously reflect the state of an applied digital input This is most useful in appli- Interface Timing TLH5690-11 XFER and WR2 grounded Byte 1Byte 2 tied to VCC FIGURE 4 16-Bit Data Bus Interface for the DAC1208 Series 8 |
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