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DAC7615EBG4 Datasheet(PDF) 9 Page - Texas Instruments |
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DAC7615EBG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 17 page 9 ® DAC7615 THEORY OF OPERATION The DAC7615 is a quad, serial input, 12-bit, voltage output DAC. The architecture is a classic R-2R ladder configuration followed by an operational amplifier that serves as a buffer. Each DAC has its own R-2R ladder network and output op amp, but all share the reference voltage inputs. The minimum voltage output (“zero-scale”) and maximum voltage output (“full-scale”) are set by external voltage references (VREFL and VREFH, respectively). The digital input is a 16-bit serial word that contains the 12-bit DAC code and a 2-bit address code that selects one of the four DACs (the two remaining bits are unused). The converter can be powered from a single +5V supply or a dual ±5V supply. Each device offers a reset function which immediately sets all DAC output voltages and internal registers to either zero-scale (code 000H) or mid-scale (code 800H). The reset code is selected by the state of the RESETSEL pin (LOW = 000H, HIGH = 800H). See Figures 1 and 2 for the basic operation of the DAC7615. ANALOG OUTPUTS When VSS = –5V (dual supply operation), the output amplifier can swing to within 2.25V of the supply rails, over the –40 °C to +85°C temperature range. With V SS = 0V (single-supply operation), the output can swing to ground. Note that the settling time of the output op amp will be longer with voltages very near ground. Also, care must be taken when measuring the zero-scale error when VSS = 0V. If the output amplifier has a negative offset, the output voltage may not change for the first few digital input codes (000H, 001H, 002H, etc.) since the output voltage cannot swing below ground. The behavior of the output amplifier can be critical in some applications. Under short-circuit conditions (DAC output shorted to ground), the output amplifier can sink a great deal more current than it can source. See the Specifications table for more details concerning short circuit current. FIGURE 1. Basic Single-Supply Operation of the DAC7615. FIGURE 2. Basic Dual-Supply Operation of the DAC7615. NOTE: (1) P and U package pin configurations shown. (2) As configured, RESET LOW sets all internal registers to code 000 H (0V). If RESETSEL is HIGH, RESET LOW sets all internal registers to code 800H (1.25V). 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V DD V OUTD V OUTC V REFL V REFH V OUTB V OUTA V SS RESETSEL RESET LOADREG LOADDACS CS CLK SDI GND Reset DACs(2) Update Selected Register Update All DAC Registers Chip Select Clock Serial Data In DAC7615(1) 0.1 µF 0.1 µF 0V to +2.5V 1 µF to 10µF +5V + 0V to +2.5V 0V to +2.5V 0V to +2.5V +2.500V NOTE: (1) P and U package pin configurations shown. (2) As configured, RESET LOW sets all internal registers to code 800 H (0V). If RESETSEL is LOW, RESET LOW sets all internal registers to code 000H (–2.5V). 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V DD V OUTD V OUTC V REFL V REFH V OUTB V OUTA V SS RESETSEL RESET LOADREG LOADDACS CS CLK SDI GND Reset DACs(2) Update Selected Register Update All DAC Registers Chip Select Clock Serial Data In DAC7615(1) 0.1 µF 0.1 µF –2.5V to +2.5V 1 µF to 10µF +5V –5V + 0.1 µF 1 µF to 10µF + –2.5V to +2.5V –2.500V 0.1 µF +2.500V –2.5V to +2.5V –2.5V to +2.5V +5V |
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