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DAC1054 bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI) |
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DAC1054 bảng dữ liệu(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Digital Interface The DAC1054 has two interface modes a WRITE mode and a READ mode The WRITE mode is used to convert a 10-bit digital input word into a voltage The READ mode is used to read back the digital data that was sent to one or all of the DACs The WRITE mode maximum clock rate is 10 MHz READ mode is limited to a 5 MHz maximum clock rate These modes are selected by the appropriate setting of the RDWR bit which is part of the instruction byte The instruction byte precedes the data byte at the DI pin In both modes a high level on the Start Bit (SB) alerts the DAC to respond to the remainder of the input stream Table I lists the instruction set for the WRITE mode when writing to only a single DAC and Table II lists the instruction set for a global write Bits A0 and A1 select the DAC to be written to The DACs are always written to MSB first All DACs will be written to sequentially if the global bit (G) is high DAC 1 is written to first then DACs 2 3 and 4 (in that order) For a global write bits A0 and A1 of the instruction byte are not required (see Figure 2 timing diagram) If the update bit (U) is high then the DAC output(s) will be updat- ed on the rising edge of CS otherwise the new data byte will be placed only in the input register Chip Select (CS) must remain low for at least one clock cycle after the last data bit has been entered (See Figures 1 and 2 ) When the U bit is set low an asynchronous update of all the DAC outputs can be achieved by taking AU low The con- tents of the input registers are loaded into the DAC regis- ters with the update occurring on the falling edge of AU CS must be held high during an asynchronous update All DAC registers will have their contents reset to all zeros on power up TABLE I WRITE Mode Instruction Set (Writing to a Single DAC) SB RDWR G U A1 A0 Description Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 1 0 0000 Write DAC 1 no update of DAC outputs 1 0 0001 Write DAC 2 no update of DAC outputs 1 0 0010 Write DAC 3 no update of DAC outputs 1 0 0011 Write DAC 4 no update of DAC outputs 1 0 0100 Write DAC 1 update DAC 1 on CS rising edge 1 0 0101 Write DAC 2 update DAC 2 on CS rising edge 1 0 0110 Write DAC 3 update DAC 3 on CS rising edge 1 0 0111 Write DAC 4 update DAC 4 on CS rising edge TABLE II WRITE Mode Instruction Set (Writing to all DACs) SB RDWR GU Description Bit 1 Bit 2 Bit 3 Bit 4 1 0 1 0 Write all DACs no update of outputs 1 0 1 1 Write all DACs update all outputs on CS rising edge 10 |
Số phần tương tự - DAC1054 |
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Mô tả tương tự - DAC1054 |
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