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DAC7512E Fiches technique(PDF) 11 Page - Burr-Brown (TI) |
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DAC7512E Fiches technique(HTML) 11 Page - Burr-Brown (TI) |
11 / 20 page DAC7512 11 SBAS156B www.ti.com TYPICAL CHARACTERISTICS: VDD = +2.7V (Cont.) At TA = +25°C, +VDD = +2.7V, unless otherwise noted. EXITING POWER-DOWN (800 H Loaded) Time (5 µs/div) CLK (2.7V/div) V OUT (1V/div) CODE CHANGE GLITCH Time (0.5 µs/div) Loaded with 2k Ω and 200pF to GND. Code Change: 800 H to 7FFH. THEORY OF OPERATION DAC SECTION The DAC7512 is fabricated using a CMOS process. The architecture consists of a string DAC followed by an output buffer amplifier. Since there is no reference input pin, the power supply (VDD) acts as the reference. Figure 1 shows a block diagram of the DAC architecture. OUTPUT AMPLIFIER The output buffer amplifier is capable of generating rail-to- rail voltages on its output which gives an output range of 0V to VDD. It is capable of driving a load of 2kΩ in parallel with 1000pF to GND. The source and sink capabilities of the output amplifier can be seen in the typical characteristics. The slew rate is 1V/µs with a half-scale settling time of 8µs with the output unloaded. FIGURE 1. DAC7512 Architecture. DAC Register REF (+) Resistor String REF(–) Output Amplifier GND V DD V OUT The input coding to the DAC7512 is straight binary, so the ideal output voltage is given by: VOUT = VDD • D 4096 where D = decimal equivalent of the binary code that is loaded to the DAC register; it can range from 0 to 4095. RESISTOR STRING The resistor string section is shown in Figure 2. It is simply a string of resistors, each of value R. The code loaded into the DAC register determines at which node on the string the voltage is tapped off to be fed into the output amplifier by closing one of the switches connecting the string to the amplifier. It is tested monotonic because it is a string of resistors. FIGURE 2. Resistor String. To Output Amplifier R R R R R |
Numéro de pièce similaire - DAC7512E |
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Description similaire - DAC7512E |
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