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DAC0832LCJ Datasheet(PDF) 16 Page - National Semiconductor (TI) |
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DAC0832LCJ Datasheet(HTML) 16 Page - National Semiconductor (TI) |
16 / 28 page DAC0830 Series Application Hints (Continued) This configuration offers several useful application advan- tages. Since the output is a voltage, an external op amp is not necessarily required but the output impedance of the DAC is fairly high (equal to the specified reference input resistance of 10 k Ω to 20 kΩ) so an op amp may be used for buffering purposes. Some of the advantages of this mode are illustrated in Figures 12, 13, 14, 15. There are two important things to keep in mind when using this DAC in the voltage switching mode. The applied refer- ence voltage must be positive since there are internal para- sitic diodes from ground to the I OUT1 and IOUT2 terminals which would turn on if the applied reference went negative. There is also a dependence of conversion linearity and gain error on the voltage difference between V CC and the voltage applied to the normal current output terminals. This is a result of the voltage drive requirements of the ladder switches. To ensure that all 8 switches turn on sufficiently (so as not to add significant resistance to any leg of the ladder and thereby introduce additional linearity and gain errors) it is recommended that the applied reference voltage be kept less than +5V DC and VCC be at least 9V more positive than V REF. These restrictions ensure less than 0.1% linearity and gain error change. Figures 16, 17, 18 characterize the ef- fects of bringing V REF and VCC closer together as well as typical temperature performance of this voltage switching configuration. 00560811 FIGURE 10. Adding Full-Scale Adjustment 00560812 FIGURE 11. Voltage Mode Switching 00560841 • Voltage switching mode eliminates output signal inver- sion and therefore a need for a negative power supply. • Zero code output voltage is limited by the low level output saturation voltage of the op amp. The 2 k Ω pull-down resistor helps to reduce this voltage. • V OS of the op amp has no effect on DAC linearity. FIGURE 12. Single Supply DAC www.national.com 16 |
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