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DAC5574 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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DAC5574 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 32 page www.ti.com THEORY OF OPERATION D/A SECTION _ + Resistor String Ref+ Ref- DAC Register VOUT 50 kW 50 kW VDD GND 70 kW V OUT + VDD D 256 RESISTOR STRING VDD To Output Amplifier R R R R GND Output Amplifier I 2C Interface DAC5574 SLAS407 – DECEMBER 2003 The architecture of the DAC5574 consists of a string DAC followed by an output buffer amplifier. Figure 27 shows a generalized block diagram of the DAC architecture. Figure 27. R-String DAC Architecture The input coding to the DAC5574 is unsigned binary, which gives the ideal output voltage as: Where D = decimal equivalent of the binary code that is loaded to the DAC register; it can range from 0 to 255. The resistor string section is shown in Figure 28. It is basically a divide-by-2 resistor, followed by 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. Because the architecture consists of a string of resistors, it is specified monotonic. Figure 28. Typical Resistor String The output buffer is a gain-of-2 noninverting amplifiers, 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 2 kΩ in parallel with 1000 pF to GND. The source and sink capabilities of the output amplifier can be seen in the typical curves. The slew rate is 1 V/µs with a half-scale settling time of 6µs with the output unloaded. I 2C is a 2-wire serial interface developed by Philips Semiconductor (see I2C-Bus Specification, Version 2.1, January 2000). The bus consists of a data line (SDA) and a clock line (SCL) with pullup structures. When the bus is idle, both SDA and SCL lines are pulled high. All the I 2C compatible devices connect to the I2C bus through open drain I/O pins, SDA and SCL. A master device, usually a microcontroller or a digital signal processor, controls the bus. The master is responsible for generating the SCL signal and device addresses. The master also generates specific conditions that indicate the START and STOP of data transfer. A slave device receives and/or transmits data on the bus under control of the master device. 10 |
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