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DAC7611UB датащи(PDF) 11 Page - Texas Instruments |
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DAC7611UB датащи(HTML) 11 Page - Texas Instruments |
11 / 17 page ® 11 DAC7611 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 equiva- lent 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. The DAC7611 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 0.1uF capacitor taking priority in this regard. The Power Supply Rejection vs Frequency graph in the Typical Performance Curves section shows the PSRR performance of the DAC7611. 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 DAC7611 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. APPLICATIONS POWER AND GROUNDING The DAC7611 can be used in a wide variety of situations— from low power, battery operated systems to large-scale industrial process control systems. In addition, some appli- cations require better performance than others, or are par- ticularly sensitive to one or two specific parameters. This diversity makes it difficult to define definite rules to follow concerning the power supply, bypassing, and grounding. The following discussion must be considered in relation to the desired performance and needs of the particular system. A precision analog component requires careful layout, ad- equate bypassing, and a clean, well-regulated power supply. As the DAC7611 is a single-supply, +5V component, it will often be used in conjunction with digital logic, microcontrollers, microprocessors, and digital signal proces- sors. The more digital logic present in the design and the higher the switching speed, the more difficult it will be to achieve good performance. Because the DAC7611 has a single ground pin, all return currents, including digital and analog return currents, must flow through this pin. The GND pin is also the ground reference point for the internal bandgap reference. Ideally, GND would be connected directly to an analog ground plane. This plane would be separate from the ground con- nection for the digital components until they are connected at the power entry point of the system (see Figure 4). The power applied to VDD should be well regulated and low- noise. Switching power supplies and DC/DC converters will often have high-frequency glitches or spikes riding on the output voltage. In addition, digital components can create similar high frequency spikes as their internal logic switches states. This noise can easily couple into the DAC output voltage through various paths between VDD and VOUT. N-Channel P-Channel V DD V OUT AGND FIGURE 3. Simplified Driver Section of Output Amplifier. POWER SUPPLY A BiCMOS process and careful design of the bipolar and CMOS sections of the DAC7611 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, LD, CLR) as close as possible to either V DD or ground. This will keep the CMOS inputs (see “Supply Current vs Logic Input Voltages” in the Typical Performance Curves) from shunt- ing current between VDD and ground. Thus, CMOS logic levels rather than TTL logic levels, are strongly recom- mended for driving the DAC7611. |
Аналогичный номер детали - DAC7611UB |
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Аналогичное описание - DAC7611UB |
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