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AD9783-EBZ датащи(PDF) 23 Page - Analog Devices |
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AD9783-EBZ датащи(HTML) 23 Page - Analog Devices |
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23 / 36 page ![]() AD9780/AD9781/AD9783 Rev. A | Page 23 of 36 SPI PORT, RESET, AND PIN MODE In general, when the AD9780/AD9781/AD9783 are powered up, an active high pulse applied to the RESET pin should follow. This ensures the default state of all control register bits. In addition, once the RESET pin goes low, the SPI port can be activated; thus, CSB should be held high. For applications without a controller, the AD9780/AD9781/ AD9783 also supports pin mode operation, which allows some functional options to be pin selected without the use of the SPI port. Pin mode is enabled anytime the RESET pin is held high. In pin mode, the four SPI port pins take on secondary functions, as shown in Table 13. Table 13. SPI Pin Functions (Pin Mode) Pin Name Pin Mode Function SDIO DATA (Register 0x02, Bit 7), bit value (1/0) equals pin state (high/low). CSB Enable mix mode. If CSB is high, Register 0x0A is set to 0x05, putting both DAC1 and DAC2 into mix mode. SDO Enable full power-down. If SDO is high, Register 0x03 is set to 0xFF. |
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