PT2260_06 参数 Datasheet PDF下载

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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

500

160

140

Frequency(KHz)

120

100

80

60

40

OSC Resistor = 510 K

Ohms

OSC Resistor = 1.0 M

Ohms

OSC Resistor = 1.2 M

Ohms

OSC Resistor = 2.2 M

Ohms

Frequency(KHz)

400

300

250

200

100

1

2

3

4

5

6

7

8

9 10 11

R=820 K

R=1 M

R=2 M

20

0

0

5

10

Voltage(Vcc)

15

Voltage(V)

Decoder (PT2272) OSC Frequency

1000

R = 100 K

(KHz) 100

R = 240 K

R = 510 K

R=1M

10

3

6

9

Voltage(V)

12

15

R=2M

Suggested Oscillator resistor values are shown below.

PT2260

820KΩ

1MΩ

2MΩ

PT2272

510KΩ

620KΩ

1.2MΩ

PT2270

1MΩ

1.2MΩ

2.2MΩ

PT2260 V1.4

-7-

April, 2006