PT2270-L3S 查看數據表（PDF） - Princeton Technology

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PT2270-L3S

Remote Control Decoder IC

Princeton Technology 

Remote Control Decoder IC

Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT2270

SINGLE RESISTOR OSCILLATOR

The built-in oscillator circuitry of PT2270 allows a precision oscillator to be constructed with only an

external resistor. For the PT2270 to decode correctly the waveform that was received, the oscillator

frequency of PT2270 must be 1/16 ~ 4 (or 2 to 30) times that of the transmitting PT2260 (or PT2262).

It is a good practice to center the PT2270 oscillator frequency in this window to gain best window

margin at both sides. The typical oscillator with various resistor values are shown below for PT2260,

PT2262 and PT2270.

100

KHz

10

R=510K

R=1M

R=2M

R=3.3M

R=4.7M

50 0

40 0

KHz 30 0

25 0

20 0

R = 47 0 K

R = 68 0 K

R = 82 0 K

R = 1M

1

3

6

9

12

15

Voltage

PT2262 Encoder OSC Frequency

10 0

R = 2M

1

2

3

4

5

6

Voltage (V)

PT2260 Encoder OSC Frequency

160

140

120

100

80

60

40

20

0

2

Rosc =510 K Ohms

Rosc=620K Ohms

Rosc=1.0 M Ohms

Rosc=1.2 M Ohms

Rosc=2.2 M Ohms

4

6

8

10

VOLTAGE (V)

PT2270 Decoder OSC Frequency

Suggested oscillator resistor values are shown below.

PT2260

PT2270

820KΩ

1.0MΩ

1.0MΩ

1.2MΩ

2.0MΩ

2.2MΩ

PT2262

1.2MΩ

1.5MΩ

3.3MΩ

PT2270

120KΩ

160KΩ

390KΩ

PT2270 V1.3

-7-

May, 2006

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