The kit can be used to evaluate the MAX5180, MAX5182, MAX5185, MAX5186, MAX5188, MAX5189, or MAX5191 with minor component changes.
Ug nx offset and scale feature update#
The MAX5183 dual, 10-bit, 40MHz, simultaneous update DAC is installed on the EV kit board. The four-layer board layout is optimized for best dynamic performance. Since the design combines high-speed analog and digital circuitry, the board layout calls for special precautions and design features.Ĭonnector pads for power supplies (AVDD, DVDD, VCC, and VEE), DAC outputs (VOUT1, VOUT1A, VOUT2, and VOUT2A), and SMA connectors for the digital and control inputs (D0-D9,active-low CS, CLK) simplify connection to the EV kit.
The board contains all circuitry necessary for evaluating the dynamic performance of these high-speed converters, including a circuit to convert the DAC's differential outputs into single-ended outputs. In this manner, the Set Offset button saves mental arithmetic and the need to remember to change the Upper as well as the Lower scaling values to yield the desired result.The MAX5183 evaluation kit (EV kit) is designed to simplify evaluation of the 8-bit and 10-bit, dual, 40MHz, simultaneous-update or alternate-phase-update MAX5180/MAX5183, MAX5182/MAX5185, MAX5186/MAX5189, and MAX5188/MAX5191 digital-to-analog converters (DACs).
That approach preserves slope and ensures a constant offset across the measurement range. To make the offset work as planned you need to redefine the Lower Level and the Upper Level scaling values by the same amount. Notice how the slope has changed and, in the process, destroyed the relationship between volts and inches across the entire measurement range except at the Lower Level value.
If you decided that you could properly offset the measurement just by changing the Lower Level scaling value, the relationship between volts and inches is described by the green line. The other two represent attempts to inject a 1 inch offset.
Ug nx offset and scale feature full#
In the nearby graph, the red line describes the relationship between volts and distance for the full measurement range of our hypothetical sensor. Let’s assume that the device provides a linear output equal to 1 inch per volt, has a 5-inch full scale range, and is zero volts at zero inches of linear measurement. It could be an LVDT, a string pot, LASER, or some other device, but it really doesn’t matter. To see why, let’s consider an example of a linear distance measuring device of some kind. Couldn’t you do that by applying a value other than zero for the lower value scale setting? That seems logical until you work though the math and discover that doing it that way actually changes the slope of the scaling line, and screws up your measurement everywhere within its dynamic range except at the initial offset value. So, making the feature more general-purpose in this manner was a good suggestion and one that we are currently implementing.Īt first blush, though, you might wonder why a separate button is required to set an offset. Although we believe that the vast majority of applications will want to force an offset to zero, we could also envision those that may want to force non-zero offsets. You can apply zero engineering units to your sensor and then use the Set Zero feature to instantly force the offset to zero when you click the button.Īlmost immediately we received a comment asking why we’d allow offsets that force the scaling only to zero, instead of a more general approach that allows an offset to any value within the ☞U range. How many times have you carefully calibrated a system only to see a slight offset in the result when you apply zero engineering units? It’s very common. We described it like this:įinally, there’s the Set Zero button that allows you to instantly compensate for zero offsets from your measurement. The new approach incorporated a Set Zero button that provided a simple way to compensate for sensors that exhibit a constant offset. In the previous post we introduced our new WinDaq Engineering Units Scaling dialog box and solicited users for advice and guidance before making it a permanent part of the application.
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