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PT2270-L3 Datasheet(PDF) 7 Page - Princeton Technology Corp |
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PT2270-L3 Datasheet(HTML) 7 Page - Princeton Technology Corp |
7 / 18 page Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2270 V1.3 - 7 - May, 2006 Remote Control Decoder IC 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 10 1 KHz 3 Voltage R=510K R=1M R=2M R=3.3M R=4.7M 6 9 12 15 1 R=2M R=1M R=820K R=680K R=470K Voltage (V) KHz 2 3 4 5 6 10 0 20 0 25 0 30 0 40 0 50 0 PT2262 Encoder OSC Frequency PT2260 Encoder OSC Frequency 0 20 40 60 80 100 120 140 160 24 68 10 VOLTAGE (V) Rosc =510 K Ohms Rosc=620K Ohms Rosc=1.0 M Ohms Rosc=1.2 M Ohms Rosc=2.2 M Ohms PT2270 Decoder OSC Frequency Suggested oscillator resistor values are shown below. PT2260 PT2270 PT2262 PT2270 820KΩ 1.0MΩ 1.2MΩ 120KΩ 1.0MΩ 1.2MΩ 1.5MΩ 160KΩ 2.0MΩ 2.2MΩ 3.3MΩ 390KΩ |
Similar Part No. - PT2270-L3 |
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Similar Description - PT2270-L3 |
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