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AD7538KR-REEL Datasheet(PDF) 9 Page - Analog Devices |
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AD7538KR-REEL Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page AD7538 Rev. B | Page 9 of 16 DAC SECTION Figure 4 shows a simplified circuit diagram for the AD7538 DAC section. The three MSBs of the 14-bit data word are decoded to drive the seven switches (A to G). The 11 LSBs of the data word consist of an R-2R ladder operated in a current steering configuration. The R-2R ladder current is ⅛ of the total reference input current. ⅞ current flows in the parallel ladder structure. Switch A to Switch G steer equally weighted currents between IOUT and AGND. Because the input resistance at VREF is constant, it may be driven by a voltage source or a current source of positive or negative polarity. 2R 2R 2R 2R 2R 2R 2R 2R 2R 2R 2R RR R R/4 G F E D C B A S10 S9 S0 VREF RFB IOUT AGND Figure 4. Simplified Circuit Diagram for the AD7538 DAC Section |
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