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DAC7624UB Datasheet(PDF) 9 Page - Texas Instruments |
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DAC7624UB Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 16 page  9 ® DAC7624/7625 1 2 3 4 V REFH V OUTB Load DAC Registers Reset DACs(1) V OUTA V SS 5 GND 6 RESET 7 8 9 10 11 12 13 14 LDAC DB0 DB1 DB2 DB3 DB4 DB5 DB6 V REFL V OUTC DAC7624 DAC7625 V OUTD V DD 28 27 26 25 NIC 24 CS 23 A0 A1 R/W DB11 DB10 DB9 DB8 DB7 22 21 20 19 18 17 16 15 Chip Select –2.5V to +2.5V –2.5V to +2.5V Read/Write Data Bus Address Bus or Decoder NOTE: (1) Reset LOW sets all DACs to code 800 H on the DAC7624 and to code 000H on the DAC7625. –2.500V 0.1µF +5V 0.1µF 1µF to 10µF + –2.5V to +2.5V –2.5V to +2.5V –5V +2.500V 0.1µF 0.1µF 1µF to 10µF + Data Bus 1 2 3 4 V REFH V OUTB Load DAC Registers Reset DACs(1) V OUTA V SS 5 GND 6 RESET 7 8 9 10 11 12 13 14 LDAC DB0 DB1 DB2 DB3 DB4 DB5 DB6 V REFL V OUTC DAC7624 DAC7625 V OUTD V DD 28 27 26 25 NIC 24 CS 23 A0 A1 R/W DB11 DB10 DB9 DB8 DB7 22 21 20 19 18 17 16 15 Chip Select Read/Write Data Bus Data Bus Address Bus or Decoder +5V NOTE: (1) Reset LOW sets all DACs to code 800 H on the DAC7624 and to code 000H on the DAC7625. 0V to +2.5V 0V to +2.5V 0V to +2.5V 0V to +2.5V 0.1µF 1µF to 10µF + +2.500V 0.1µF THEORY OF OPERATION The DAC7624 and DAC7625 are quad, voltage output, 12-bit digital-to-analog converters (DACs). The architecture is a classic R-2R ladder configuration followed by an opera- tional 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 the external voltage references (VREFL and VREFH, respectively). The digital input is a 12-bit parallel word and the DAC input registers offer a readback capability. The converters 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 DAC regis- ters to mid-scale (DAC7624, code 800H) or to zero-scale (DAC7625, code 000H). See Figures 1 and 2 for the basic operation of the DAC7624/25. FIGURE 1. Basic Single-Supply Operation of the DAC7624/25. FIGURE 2. Basic Dual-Supply Operation of the DAC7624/25. |
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