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DAC7612UB Fiches technique(PDF) 11 Page - Texas Instruments |
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DAC7612UB Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 16 page 11 ® DAC7612 noise, and a set gain of 1.682V/V (4.095/2.435). See Figure 2 for an equivalent circuit schematic of the analog portion of the DAC7612. The output amplifier has a 7 µs typical settling time to ±1 LSB of the final value. Note that there are differences in the settling time for negative-going signals versus positive- going signals. The rail-to-rail output stage of the amplifier provides the full- scale range of 0V to 4.095V while operating on a supply voltage as low as 4.75V. In addition to its ability to drive resistive loads, the amplifier will remain stable while driving capacitive loads of up to 500pF. See Figure 3 for an equivalent circuit schematic of the amplifier’s output driver and the Typical Performance Curves section for more information regarding settling time, load driving capability, and output noise. POWER SUPPLY A BiCMOS process and careful design of the bipolar and CMOS sections of the DAC7612 result in a very low power device. Bipolar transistors are used where tight matching and low noise are needed to achieve analog accuracy, and CMOS transistors are used for logic, switching functions and for other low power stages. If power consumption is critical, it is important to keep the logic levels on the digital inputs (SDI, CLK, CS, LOADDACS) as close as possible to either VDD or ground. This will keep the CMOS inputs (see “Supply Current vs Logic Input Voltages” in the Typical Performance Curves) from shunting current between VDD and ground. The DAC7612 power supply should be bypassed as shown in Figure 1. The bypass capacitors should be placed as close to the device as possible, with the 0.1 µF capacitor taking priority in this regard. The “Power Supply Rejection vs Frequency” graph in the Typical Performance Curves sec- tion shows the PSRR performance of the DAC7612. This should be taken into account when using switching power supplies or DC/DC converters. In addition to offering guaranteed performance with VDD in the 4.75V to 5.25V range, the DAC7612 will operate with reduced performance down to 4.5V. Operation between 4.5V and 4.75V will result in longer settling time, reduced performance, and current sourcing capability. Consult the “VDD vs Load Current” graph in the Typical Performance Curves section for more information. FIGURE 2. Simplified Schematic of Analog Portion. FIGURE 3. Simplified Driver Section of Output Amplifier. N-Channel P-Channel V DD V OUT GND 2R 2R 2R R 2R 2R R R 1 R R 2 Output Amplifier R-2R DAC Bandgap Reference 2.435V Typical of DAC A or DAC B Buffer |
Numéro de pièce similaire - DAC7612UB |
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Description similaire - DAC7612UB |
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