PT2272-L6 查看數據表（PDF） - Princeton Technology

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PT2272-L6

PT2272 / 2272-M2S / Remote Control Decoder / Available in DIP and SOP

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

Remote Control Decoder

PT2272

SINGLE RESISTOR OSCILLATOR

The built-in oscillator circuitry of PT2272 allows a precision oscillator to be constructed with only an

external resistor. For the PT2272 to decode correctly the waveform that was received, the oscillator

frequency of PT2272 must be 2.5~8 times that of the transmitting PT2262. It is a good practice to

center the PT2272 oscillator frequency in this window to gain best window margin at both sides. The

typical oscillator with various resistor values is shown below for both PT2262 and PT2272.

KHz

100

10

1

Encoder OSC Frequency

R = 510 K

R=1M

R=2M

R = 3.3 M

R = 4.7 M

KHz

1000

100

10

Decoder OSC Frequency

R = 100 K

R = 240 K

R = 510 K

R=1M

R=2M

3

6

9

12

15

VOLTAGE

3

6

9

12

15

VOLTAGE

Suggested oscillator resistor values are shown below.

PT2262

4.7MΩ

3.3MΩ

1.2MΩ

PT2272

820KΩ *

680KΩ *

200KΩ **

Note:

* -- Operates when PT2272's VCC=5V to 15V

** -- Operates when PT2272's VCC= 4V to 15V

This means that if the PT2272 supply voltage is lower than 5V, you have to use a lower oscillator

resistor value for both PT2262 and PT2272.

PT2272 V3.7

-8-

June, 2008

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