RDS PIRA32 Manual
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Contents
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PIRA32 Microcontrollerm32.pdf - page 8 © 2016 Pira.cz3.7 Digital-to-Analog converterThe Microcontroller uses parallel 8-bit D/A converter with over-sampling technique. Digital data provided on DApins can be directly formed into final analogue RDS output signal using low-cost resistor network.Figure 4.3 shows accurate 8-bit DAC using R/2R resistor network. It’s a binary weighted DAC that creates eachvalue with a repeating structure of 2 resistor values, R and R times two. This is an optimal DAC for this device.The resistor value tolerance must not exceed 2 %.Figure 4.3 - 8-bit D/A converter R/2R networkFigure 4.4 – Output RDS signal on oscilloscope (horizontal: 200 μs/div, vertical: 500 mV/div).6 |
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