Locating Signals
DAC Input, Parallel
Board label. DAC_IN0: DAC_IN7
Connector grid location. F1, F2
Description. These are the 8-bit parallel output signals of the port expander in the middle of the mixed signal chain. The sine
wave data from the SPI bus is converted to 8 parallel bits to drive the DAC . DAC IN0 is the LSB. (See Figure 2.)
See the previous SPI Bus de scription for packet details.
DAC Output
Board label. DAC_OUT
Connector g rid location. I2
Description. This is the outp ut of the DAC at the end of the mixed s ignal chain. The DAC is driven from the port expa nder. The
DAC output is a sine wave. Since the output is not fi ltered, the digitizing levels are obvious in the output waveform. (See Figure 2.)
The resulting DAC voltage is a s ine wave with an amplitude 0 to 3 volts, and a period of 310 ms.
I2S ( Int e r- IC Sound) Bus
Board label. I2S_SCK, I2S_WS, I2S_SD
Connector grid location. G2,G7,H7,I6
116 Demo 2 Board Instruction Manual
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