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DAC8532 Datasheet(PDF) 10 Page - Texas Instruments |
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DAC8532 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 23 page  DAC8532 10 SBAS246A www.ti.com THEORY OF OPERATION DAC SECTION The architecture of each channel of the DAC8532 consists of a resistor string DAC followed by an output buffer amplifier. Figure 1 shows a simplified block diagram of the DAC architecture. The input coding for each device is unipolar straight binary, so the ideal output voltage is given by: VX V D OUT REF =• 65536 where D = decimal equivalent of the binary code that is loaded to the DAC register; it can range from 0 to 65535. VOUTX refers to channel A or B. RESISTOR STRING The resistor string section is shown in Figure 2. It is simply a divide-by-2 resistor followed by a string of resistors, each of value R. The code loaded into the DAC register deter- mines at which node on the string the voltage is tapped off. This voltage is then applied to the output amplifier by closing one of the switches connecting the string to the amplifier. OUTPUT AMPLIFIER Each output buffer amplifier is capable of generating rail-to- rail voltages on its output which approaches an output range of 0V to VDD (gain and offset errors must be taken into account). Each buffer is capable of driving a load of 2k Ω in parallel with 1000pF to GND. The source and sink capabili- ties of the output amplifier can be seen in the typical charac- teristics. SERIAL INTERFACE The DAC8532 uses a 3-wire serial interface (SYNC, SCLK, and DIN), which is compatible with SPI™, QSPI™, and Microwire™ interface standards, as well as most DSPs. See the Serial Write Operation timing diagram for an example of a typical write sequence. SPI and QSP are registered trademarks of Motorola. Microwire is a registered trademark of National Semiconductor. DAC Register REF (+) Resistor String REF(–) Output Amplifier GND V REF V OUTX FIGURE 1. DAC8532 Architecture. To Output Amplifier (2x Gain) R R R R V REF 2 V REF R DIVIDER FIGURE 2. Resistor String. The write sequence begins by bringing the SYNC line LOW. Data from the DIN line is clocked into the 24-bit shift register on each falling edge of SCLK. The serial clock frequency can be as high as 30MHz, making the DAC8532 compatible with high speed DSPs. On the 24th falling edge of the serial clock, the last data bit is clocked into the shift register and the programmed function is executed (i.e., a change in Data Buffer contents, DAC Register contents, and/or a change in the power-down mode of a specified channel or channels). At this point, the SYNC line may be kept LOW or brought HIGH. In either case, the minimum delay time from the 24th falling SCLK edge to the next falling SYNC edge must be met in order to properly begin the next cycle. To assure the lowest power consumption of the device, care should be taken that the digital input levels are as close to each rail as possible. (Please refer to the “Typical Characteristics” sec- tion for the “Supply Current vs Logic Input Voltage” transfer characteristic curve). |
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Similar Description - DAC8532 |
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