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PT2260 V1.4

- 7 -

April, 2006

Remote Control Encoder

PT2260

SINGLE OSCILLATOR

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

500

400

300

250

200

100

1

2

3

4

5

6

7

8

9 10 11

R=2 M

R=1 M

R=820 K

Voltage(V)

0

20

40

60

80

100

120

140

160

180

0

5

10

15

Voltage(Vcc)

OSC Resistor = 510 K

Ohms

OSC Resistor = 1.0 M

Ohms

OSC Resistor = 1.2 M

Ohms

OSC Resistor = 2.2 M

Ohms

Decoder (PT2272) OSC Frequency

1000

100

10

(KHz)

3

6

9

12

15

Voltage(V)

R = 100 K

R = 240 K

R = 510 K

R = 1 M

R = 2 M

Suggested Oscillator resistor values are shown below.

PT2260

PT2272

PT2270

820KΩ

510KΩ

1MΩ

1MΩ

620KΩ

1.2MΩ

2MΩ

1.2MΩ

2.2MΩ