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AD5764CSUZ Datasheet(PDF) 22 Page - Analog Devices |
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AD5764CSUZ Datasheet(HTML) 22 Page - Analog Devices |
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22 / 28 page  AD5764 Data Sheet Rev. F | Page 22 of 28 FINE GAIN REGISTER The fine gain register is addressed by setting the three REG bits to 100. The DAC address bits select with which DAC channel the data transfer is to take place (see Table 10). The fine gain register is a 6-bit register and allows the user to adjust the gain of each DAC channel by −32 LSBs to +31 LSBs in 1 LSB increments, as shown in Table 16 and Table 17. The adjustment is made to both the positive full-scale points and the negative full-scale points simultaneously, each point being adjusted by ½ of one step. The fine gain register coding is twos complement. OFFSET REGISTER The offset register is addressed by setting the three REG bits to 101. The DAC address bits select with which DAC channel the data transfer is to take place (see Table 10). The AD5764 offset register is an 8-bit register and allows the user to adjust the offset of each channel by −16 LSBs to +15.875 LSBs in increments of ⅛ LSB, as shown in Table 18 and Table 19. The offset register coding is twos complement. Table 16. Programming the Fine Gain Register Bit Map REG2 REG1 REG0 A2 A1 A0 DB15:DB6 DB5 DB4 DB3 DB2 DB1 DB0 1 0 0 DAC address Don’t care FG5 FG4 FG3 FG2 FG1 FG0 Table 17. Fine Gain Register Options Gain Adjustment FG5 FG4 FG3 FG2 FG1 FG0 +31 LSBs 0 1 1 1 1 1 +30 LSBs 0 1 1 1 1 0 … … … … … … … +2 LSBs 0 0 0 0 1 0 +1 LSB 0 0 0 0 0 1 No Adjustment (Default) 0 0 0 0 0 0 −1 LSB 1 1 1 1 1 1 −2 LSBs 1 1 1 1 1 0 … … … … … … … −31 LSBs 1 0 0 0 0 1 −32 LSBs 1 0 0 0 0 0 Table 18. Programming the Offset Register Bit Map REG2 REG1 REG0 A2 A1 A0 DB15:DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 1 0 1 DAC address Don’t care OF7 OF6 OF5 OF4 OF3 OF2 OF1 OF0 Table 19. AD5764 Offset Register Options Offset Adjustment OF7 OF6 OF5 OF4 OF3 OF2 OF1 OF0 +15.875 LSBs 0 1 1 1 1 1 1 1 +15.75 LSBs 0 1 1 1 1 1 1 0 … … … … … … … … … +0.25 LSBs 0 0 0 0 0 0 1 0 +0.125 LSBs 0 0 0 0 0 0 0 1 No Adjustment (Default) 0 0 0 0 0 0 0 0 −0.125 LSBs 1 1 1 1 1 1 1 1 −0.25 LSBs 1 1 1 1 1 1 1 0 … … … … … … … … … −15.875 LSBs 1 0 0 0 0 0 0 1 −16 LSBs 1 0 0 0 0 0 0 0 |
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