DAC7715 and TMS320F28335

To convert a digital signal to an analog signal, a digital-to-analog converter should be used and interacted with a micro-processor. In practical implementation, this task is very important when showing the experimental results in papers or reports. Of course, the scale issue should be taken into account to indicate the true value of control variables. This guide introduces a kind of DAC chip from TI, DAC7715. In addition, the hardware interface between DAc7715 and DSP TMS320F28335 will be described in order to help those who have the same consideration.

From TI’s site, DAC7715 is introduced as follows

“The DAC7715 is a quad, serial input, 12-bit, voltage output Digital-to-Analog Converter (DAC) with guaranteed 12-bit monotonic performance over the –40°C to +85°C temperature range. An asynchronous reset clears all registers to either mid-scale (800_H) or zero-scale (000_H), selectable via the RESETSEL pin. The individual DAC inputs are double buffered to allow for simultaneous update of all DAC outputs. The device can be powered from a single +15V supply or from dual +15V and –15V supplies.

Low power and small size makes the DAC7715 ideal for automatic test equipment, DAC-per-pin programmers, data acquisition systems, and closed-loop servo-control. The device is available in a SO-16 package and is guaranteed over the –40°C to +85°C temperature range.”

For more details about this chip, it can be seen here http://focus.ti.com/lit/ds/sbas140/sbas140.pdf

DAC7715 is connected with TMS320F28335 via SPI function available in the DSP chip. Hardware interface between DAC7715 and TMS320F28335 DSP (for design reference) is given below

Good luck!