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AD7490BRU-REEL7 Datasheet(PDF) 22 Page - Analog Devices |
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AD7490BRU-REEL7 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 29 page  Data Sheet AD7490 Rev. D | Page 21 of 28 Powering Up the AD7490 When supplies are first applied to the AD7490, the ADC may power up in any of the operating modes of the part. To ensure that the part is placed into the required operating mode, the user should perform a dummy cycle operation, as outlined in Figure 26. The three dummy conversion operations outlined in Figure 26 must be performed to place the part into either of the auto modes. The first two conversions of this dummy cycle operation are performed with the DIN line tied high, and for the third conver- sion of the dummy cycle operation, the user should write the desired control register configuration to the AD7490 to place the part into the required auto mode. On the third CS rising edge after the supplies are applied, the control register contains the correct information and valid data results from the next conversion. Therefore, to ensure the part is placed into the correct operating mode when supplies are first applied to the AD7490, the user must first issue two serial write operations with the DIN line tied high. On the third conversion cycle, the user can then write to the control register to place the part into any of the operating modes. The user should not write to the Shadow register until the fourth conversion cycle after the supplies are applied to the ADC to guarantee that the control register contains the correct data. If the user wishes to place the part into either normal mode or full shutdown mode, the second dummy cycle with DIN tied high can be omitted from the three dummy conversion operation outlined in Figure 26. SCLK 1 12 16 1 12 16 1 12 16 DOUT DIN CS DUMMY CONVERSION DUMMY CONVERSION CORRECT VALUE IN CONTROL REGISTER VALID DATA FROM NEXT CONVERSION USER CAN WRITE TO SHADOW REGISTER IN NEXT CONVERSION INVALID DATA INVALID DATA INVALID DATA DATA IN TO CONTROL CONTROL REGISTER IS LOADED ON THE FIRST 12 CLOCK EDGES KEEP DIN LINE TIED HIGH FOR FIRST TWO DUMMY CONVERSIONS Figure 26. Placing into the Required Operating Mode After Supplies Are Applied |
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