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Remote Control Encoder
SINGLE OSCILLATOR
PT2260
The built-in oscillator circuitry of PT2260 allows a precision oscillator to be constructed by connecting
an external resistor between OSC and Vcc pins. For PT2270 (or PT2272) to decode correctly the
received waveform, the oscillator frequency of PT2270 (or PT2272) must be 1/16 ~ 4 (or 1/16 ~ 1/4)
times that of the transmitting PT2260. The typical oscillator frequency with various resistor values for
PT2260, PT2270, and PT2272 are shown below:
Encoder (PT2260) OSC Frequency
Decoder (PT2270) OSC Frequency
180
160
140
500
400
OSC Resistor = 510 K
Ohms
120
300
250
200
R=820 K
R=1 M
100
80
60
40
20
0
OSC Resistor = 1.0 M
Ohms
OSC Resistor = 1.2 M
Ohms
R=2 M
100
OSC Resistor = 2.2 M
Ohms
1
2
3
4
5
6
7
8
9 10 11
Voltage(V)
0
5
10
Voltage(Vcc)
15
Decoder (PT2272) OSC Frequency
1000
R = 100 K
R = 240 K
R = 510 K
(KHz)
100
10
R = 1 M
R = 2 M
3
6
9
12
15
Voltage(V)
Suggested Oscillator resistor values are shown below.
PT2260
820KΩ
1MΩ
PT2272
510KΩ
620KΩ
1.2MΩ
PT2270
1MΩ
1.2MΩ
2.2MΩ
2MΩ
PT2260 V1.4
- 7 -
April, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
