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AD5546 Datasheet(PDF) 13 Page - Analog Devices |
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AD5546 Datasheet(HTML) 13 Page - Analog Devices |
13 / 16 page ![]() AD5546/AD5556 Rev. 0 | Page 13 of 16 APPLICATIONS UNIPOLAR MODE 2-Quadrant Multiplying Mode, VOUT = 0 V to –VREF The AD5546/AD5556 DAC architecture uses a current-steering R-2R ladder design that requires an external reference and op amp to convert the unipolar mode of output voltage to VOUT = –VREF × D/65,536 (AD5546) (1) VOUT = –VREF × D/16,384 (AD5556) (2) where D is the decimal equivalent of the input code. The output voltage polarity is opposite to the VREF polarity in this case (see Figure 21). Table 8 shows the negative output versus code for the AD5546. Table 8. AD5546 Unipolar Mode Negative Output vs. Code D in Binary VOUT (V) 1111 1111 1111 1111 –VREF(65,535/65,536) 1000 0000 0000 0000 –VREF/2 0000 0000 0000 0001 –VREF(1/65,536) 0000 0000 0000 0000 0 2-Quadrant Multiplying Mode, VOUT = 0 V to +VREF The AD5546/AD5556 are designed to operate with either positive or negative reference voltages. As a result, positive output can be achieved with an additional op amp, (see Figure 22), and the output becomes VOUT = +VREF × D/65,536 (AD5546) (3) VOUT = +VREF × D/16,384 (AD5556) (4) Table 9 shows the positive output versus code for the AD5546. Table 9. AD5546 Unipolar Mode Positive Output vs. Code D in Binary VOUT (V) 1111 1111 1111 1111 +VREF(65,535/65,536) 1000 0000 0000 0000 +VREF/2 0000 0000 0000 0001 +VREF(1/65,536) 0000 0000 0000 0000 0 16/14-BIT 2 +5V 5 4 GND VIN TRIM U3 ADR03 VOUT VDD R1 ROFS ROFS VOUT –2.5V TO 0V RFB RFB C6 2.2pF GND U1 AD5546/AD5556 IOUT R2 C4 0.1 µF C5 1 µF RCOM R1 16/14 DATA REF U2 AD8628 – + –5V WR WR LDAC LDAC RS RS MSB MSB C2 0.1 µF C1 1 µF C3 0.1 µF V+ V– Figure 21. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to –VREF |
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