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DAC7631 Datasheet(PDF) 15 Page - Texas Instruments |
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DAC7631 Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 24 page ![]() 15 ® DAC7631 FIGURE 10. Single-supply Buffered VREFH. FIGURE 11. Linearity and Differential Error Curves for Figure 10. FIGURE 13. Linearity and Differential Error Curves for Figure 12. FIGURE 12. Low cost Single-supply Configuration. Data is shifted into the device through the SDI and CLK pins and arrives in a shift register. Once all 16 bits have been transferred, the LOAD pin, which is level-sensitive, should be brought low to latch the data into a buffer register called the DAC input register. To latch the new data into the DAC itself, the LDAC pin, which is edge-sensitive, must be brought high. When this is done, the DAC will assume the new value and the output voltage will change (provided that the new value is different from the old one). Note that settling time is measured from the time that the LDAC pin is brought high, since the device’s output does not begin to change until then. The DAC7631’s double-buffering scheme allows the device to be updated through the serial interface without disturbing the voltage on the output pin. It also allows the user to use separate logic for driving the serial input and triggering 2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 LINEARITY ERROR AND DIFFERENTIAL LINEARITY ERROR vs CODE (DAC A, +25 °C) 0000 H 2000 H 4000 H 6000 H 8000 H Digital Input Code A000 H C000H E000 H FFFFH Reset DAC Registers Chip Select Load DGND V CC SDI CLK CS V CC AGND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DAC7631 V REFH Sense V REFH V REFL Sense V REFL SDO V SS V OUT Sense V OUT NC RSTSEL RST LOAD Serial Data In Clock Load DAC Registers LDAC Serial Data Out + 0.1 µF1µF +5V +2.5V +V V OUT 2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 LINEARITY ERROR AND DIFFERENTIAL LINEARITY ERROR vs CODE (DAC A, +25 °C) 0000 H 2000 H 4000 H 6000 H 8000 H Digital Input Code A000 H C000H E000 H FFFFH +2.5V +V +V OPA2350 2200pF 100 Ω 1000pF 1 2 3 4 V REFH V REFH Sense V REFL V REFL Sense DAC7631 |
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