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DAC7731E Datasheet(PDF) 10 Page - Texas Instruments |
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DAC7731E Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page DAC7731 10 SBAS249B www.ti.com V CC REF OUT REF IN REFADJ V REF R OFFSET AGND RFB2 RFB1 SJ V OUT V DD V SS REFEN RSTSEL SCLK CS SDO SDI LDAC RST NC TEST DGND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 DAC7731 1 µF 0.1 µF V CC 1 µF 0.1 µF V DD Control/Data Bus 1 µF 0.1 µF V SS (–5V to +5V) FIGURE 3. Basic Operation: VOUT = –5V to +5V. THEORY OF OPERATION The DAC7731 is a voltage output, 16-bit DAC with a +10V built-in internal reference. The architecture is an R-2R ladder configuration with the three MSBs segmented, followed by an operational amplifier that serves as a buffer, as shown in Figure 1. The output buffer is designed to allow user- configurable output adjustments giving the DAC7731 output voltage ranges of 0V to +10V, –5V to +5V, or –10V to +10V. Please refer to Figures 2, 3, and 4 for pin configuration information. The digital input is a serial word made up of the DAC code (MSB first) and is loaded into the DAC register using the LDAC input pin. The converter can be powered from ±12V to ±15V dual analog supplies and a +5V logic supply. The device offers a reset function, which immediately sets the DAC output voltage and DAC register to min-scale (code 0000H) or mid-scale (code 8000H). The data I/O and reset functions are discussed in more detail in the following sec- tions. FIGURE 1. DAC7731 Architecture. FIGURE 2. Basic Operation: VOUT = 0V to +10V. 2R 2R 2R 2R 2R 2R 2R 2R 2R R/4 R/2 R/2 R/4 R/4 R R OFFSET RFB2 RFB1 SJ V OUT V REF V REF AGND REF IN REF ADJ REF OUT +10V Internal Reference Buffer V CC REF OUT REF IN REFADJ V REF R OFFSET AGND RFB2 RFB1 SJ V OUT V DD V SS REFEN RSTSEL SCLK CS SDO SDI LDAC RST NC TEST DGND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 DAC7731 1 µF 0.1 µF V CC 1 µF 0.1 µF V DD Control/Data Bus 1 µF 0.1 µF V SS (0V to +10V) |
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