# Lab Exercise 6: Digital/Analog conversion logic

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3 Plot your measurements and fit a line to your results (10 points or so between 0V and 5V). How linear is the ADC scale? ADC output (counts) Input voltage (V)

4 2. Digital-to-analog conversion Now connect and test a high-speed multiplying D/A converter IC. Read and consult the data sheet for the DAC08 for this portion of the lab. Connect V+ and V- to +5V and -5V, respectively. The ADC requires eight parallel digital signals as input. Disconnect the LEDs from your ADC circuit from section 1 and connect the ADC outputs directly to your DAC inputs (output 0 to input 0, 1 to 1, and so on). The logic threshold control pin (VLC) should be left unconnected. As for the ADC, a DAC also requires two reference voltages to set the output scale. The positive reference voltage is typically +2V and the negative voltage should be connected to GND. Do not connect these directly, but make these connections through ~1k resistors (see Figure 4 in the data sheet, for example) to provide a reference current. The compensation input (COMP) may be left unconnected. The output pins drive current, instead of voltage. The maximum value of IO is 2 ma. To produce an output voltage, connect 2 kω resistors between the IO and inverted IO outputs to GND. Draw a schematic of your DAC circuit below. Again, it is recommended to plan this before class.

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