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DAC8043AFP Datasheet(PDF) 8 Page - Analog Devices |
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DAC8043AFP Datasheet(HTML) 8 Page - Analog Devices |
8 / 8 page REV. B DAC8043A –8– reference, the DAC output will provide a proportional dc voltage output according to the transfer equation: VOUT = –D/4096 × VREF where D is the decimal data loaded into the DAC register and VREF is the externally applied reference voltage source. VREF IOUT GND OP77 2R R RFB VAC VDD RFB 10VP VOUT 2R DIGITAL INPUTS OMITTED FOR CLARITY 10pF Figure 19. Unipolar (2-Quadrant) Operation BIPOLAR 4-QUADRANT MULTIPLYING Figure 20 shows a suggested circuit to achieve 4-quadrant mul- tiplying operation. The summing amplifier multiplies VOUT1 by 2, and offsets the output with the reference voltage so that a midscale digital input code of 2048 places VOUT2 at zero volts. The negative full-scale voltage will be VREF when the DAC is loaded with all zeros. The positive full-scale output will be –(VREF – 1 LSB) when the DAC is loaded with all ones. Thus the digital coding is offset binary. The voltage output transfer equation for various input data and reference (or signal) values follows: VOUT2 = (D/2048 – 1) × –V REF where D is the decimal data loaded into the DAC register and VREF is the externally applied reference voltage source. Precision resistors will be necessary to avoid ratio errors. Other- wise trimming will be required to achieve full accuracy specifica- tions available from the DAC8043A device. See the various Analog Devices Digital Potentiometer products for automated trimming solutions (e.g., the AD5204 for low voltage applica- tions or the AD7376 for high voltage applications). (0V TO –VREF) VREF IOUT GND 2R R RFB VAC VDD RFB 10VP VOUT1 2R DIGITAL INPUTS OMITTED FOR CLARITY OP213 10k OP213 VOUT2 20k 20k 10pF Figure 20. Bipolar (4-Quadrant) Operation 8-Lead Standard Small Outline Package [SOIC_N] (R-8) S-Suffix Dimensions shown in millimeters and (inches). 8-Lead Plastic Dual In-Line Package [PDIP] (N-8) Dimensions shown in inches and (millimeters). 8-Lead Thin Shrink Small Outline Package [TSSOP] (RU-8) Dimensions shown in millimeters. OUTLINE DIMENSIONS |
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