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In this post, I program the current mode of the DAC8775, the subject of the Quad-Channel, Analog Output Module RoadTest. The DAC will, within limits, try to source the current you're defining     Configurable Current  Additional to the traditional voltage mode, this DAC can source current. It has a number of ranges that can be controlled:   In this exercise I'm setting the mode to 0101: 0 - 20 mA.   In code:       TX_Data_Master[0] = 0x04; & ...
In this post, I test the slew rate of the DAC8775, the subject of the Quad-Channel, Analog Output Module RoadTest. The edge of the DAC generated signal is programmable. Let's look at how to control it.     Configurable Slew Rate  One of the options you can set on the DAC is the speed at which the signal changes. Depending on your application this can be useful. By default this control is switched off and the DAC tries to reach the desired level as fast as it can. The image b ...
In this post, I document the firmware I use to test the DAC8775, the subject of the Quad-Channel, Analog Output Module RoadTest. I'm using a Hercules automotive microcontroller to talk to the DAC. I'll cover the peripheral configuration and the test code. Even if you're using a different controller, the sequence of events may help you to write your own code for this DAC.   Connections  The Hercules is one of the smallest of the family, a TMS570LS04. I use this because it has all ...
A year ago, the DAC8775 was the subject of the Quad-Channel, Analog Output Module RoadTest. My element14 friend DAB was not impressed by the EVM and its software. I asked if he wanted to trade the board for another evaluation module, and he did. After some hick-ups with post services, the evaluation kit for the DAC is finally in my hands. My review will be different than the official reviews, because I don't have the device to connect the EVM to USB. I will use SPI to talk to the device ins ...
A year ago, the DAC8775 was the subject of the Quad-Channel, Analog Output Module RoadTest. My element14 friend DAB was not impressed by the EVM and its software. I asked if he wanted to trade the board for another evaluation module, and he did. After some hick-ups with post services, the evaluation kit for the DAC is finally in my hands. My review will be different than the official reviews, because I don't have the device to connect the EVM to USB. I will use SPI to talk to the device ins ...