195CHAPTER 8 16-BIT TIMER/EVENT COUNTERPD78054, 78054YμTO0/P30V SS8.2 kΩ8.2 kΩ100 pF22 kΩ+110 V2SC235247 kΩ 47 kΩ 47 kΩ0.22 Fμ 0.22 Fμ 0.22 Fμ ElectronicTunerGNDPC574JμSwitching CircuitTO0/P30PWMsignalVREFLow-Pass Filter Analog Output (V AN)PD78054, 78054YμBy integrating 14-bit resolution PWM pulses with an external low-pass filter, they can be converted to an analogvoltage and used for electronic tuning and D/A converter applications, etc.The analog output voltage (V AN ) used for D/A conversion with the configuration shown in Figure 8-14 is as follows.V AN = V REF ×2 16V REF : External switching circuit reference voltageFigure 8-14. Example of D/A Converter Configuration with PWM Outputcapture/compare register 00 (CR00) valueFigure 8-15 shows an example in which PWM output is converted to an analog voltage and used in a voltagesynthesizer type TV tuner.Figure 8-15. TV Tuner Application Circuit Example
