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AD74111 Datasheet(PDF) 13 Page - Analog Devices |
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AD74111 Datasheet(HTML) 13 Page - Analog Devices |
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13 / 21 page ![]() REV. 0 –12– AD74111 Table II. Serial Mode Selection CRD:2 CRC:5, 4 CRD:3 DSP Word Operating DM/MM Mode Width Mode Figure 00 16 16-Bit Data Mode 15 01 16 32-Bit Data Mode 19 10 16 16-Bit Mixed Mode 13 11 16 32-Bit Mixed Mode 17 00 >16 16-Bit Data Mode 16 01 >16 32-Bit Data Mode 20 10 >16 16-Bit Mixed Mode 14 11 >16 32-Bit Mixed Mode 18 DFS (MM16) DIN 1/ fS STATUS (16 BITS) DOUT STATUS (16 BITS) 128 DCLKs (NORMAL MODE) 256 DCLKs (FAST MODE) CONTROL (16 BITS) DAC (16 BITS) STATUS (16 BITS) ADC (16 BITS) CONTROL (16 BITS) DAC (16 BITS) STATUS (16 BITS) ADC (16 BITS) Figure 13. 16-Bit Mixed Mode, Word Length = 16 Bits 16 DCLKS DFS (MM16) DIN 1/ fS DOUT 128 DCLKs (NORMAL MODE) 256 DCLKs (FAST MODE) CONTROL (16 BITS) STATUS (16 BITS) DAC DATA (24 BITS) ADC DATA (24 BITS) CONTROL (16 BITS) STATUS (16 BITS) Figure 14. 16-Bit Mixed Mode, Word Length = 24 Bits DFS (MM16) DIN 1/ fS STATUS (16 BITS) DOUT STATUS (16 BITS) 128 DCLKs (NORMAL MODE) 256 DCLKs (FAST MODE) DAC (16 BITS) ADC (16 BITS) DAC (16 BITS) ADC (16 BITS) Figure 15. 16-Bit Data Mode, Word Length = 16 Bits there will be a fixed relationship between the instruction cycle time of the DSP program and the AD74111, so a timer could be used to accurately control the DAC updates. If a timer is not available, the Multiframe-Sync (MFS) mode could be used to generate a DFS pulse every 16 or 32 DCLKs, allowing the DSP to accurately control the number of DCLKs between updates using an autobuffering or DMA type technique. In all cases for Slave mode operation, there should be 128 DCLKs (Normal mode) or 256 DCLKs (Fast mode) between DAC updates. The ADC operates in a similar manner; however, if the DSP does not read an ADC result, this will appear only as a missed sample and will not be audible. Slave mode is most suited to state-machine type applications where the number of DCLKs and their relationships to the other interface signals can be controlled. |
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