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By integrating 14-bit resolution PWM pulses with an external low-pass filter, they can be converted to an analog
voltage and used for electronic tuning and D/A converter applications, etc.
The analog output voltage (V
V
AN
V
REF
PD78014,78014Y
www.DataSheet4U.com
Figure 8-13 shows an example in which PWM output is converted to an analog voltage and used in a voltage
synthesizer type TV tuner.
CHAPTER 8 16-BIT TIMER/EVENT COUNTER
) used for D/A conversion with the configuration shown in Figure 8-12 is as follows.
AN
16-bit compare register (CR00) value
×
= V
REF
16
2
: External switching circuit reference voltage
Figure 8-12. Example of D/A Converter Configuration with PWM Output
PWM signal
TO0/P30
Switching circuit
Figure 8-13. TV Tuner Application Circuit Example
PD78014,78014Y
100 pF
TO0/P30
8.2 kΩ
8.2 kΩ
V
SS
V
REF
+110 V
22 kΩ
47 kΩ
47 kΩ
0.22 F
2SC
2352
PC574J
Analog output (V
Low-pass filter
47 kΩ
0.22 F
0.22 F
Electronic
Tuner
GND
)
AN
189
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