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DAC8043AEP датащи(PDF) 8 Page - Analog Devices |
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DAC8043AEP датащи(HTML) 8 Page - Analog Devices |
8 / 8 page REV. 0 DAC8043A –8– UNIPOLAR 2-QUADRANT MULTIPLYING The most straightforward application of the DAC8043A is in the 2-quadrant multiplying configuration shown in Figure 19. If the reference input signal is replaced with a fixed dc voltage reference, the DAC output will provide a proportional dc volt- age output according to the transfer equation: VOUT = –D/4096 × V REF 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 SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 4 1 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) BSC 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8° 0° 0.0196 (0.50) 0.0099 (0.25) x 45° 8-Lead Plastic DIP (N-8) 8 14 5 0.430 (10.92) 0.348 (8.84) 0.280 (7.11) 0.240 (6.10) PIN 1 SEATING PLANE 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) MIN 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) BSC 0.160 (4.06) 0.115 (2.93) 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 8-Lead TSSOP (RU-8) 8 5 4 1 0.122 (3.10) 0.114 (2.90) PIN 1 0.0256 (0.65) BSC SEATING PLANE 0.006 (0.15) 0.002 (0.05) 0.0118 (0.30) 0.0075 (0.19) 0.0433 (1.10) MAX 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 8 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). |
Аналогичный номер детали - DAC8043AEP |
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Аналогичное описание - DAC8043AEP |
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