поискавой системы для электроныых деталей |
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TA31273FN датащи(PDF) 4 Page - Toshiba Semiconductor |
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TA31273FN датащи(HTML) 4 Page - Toshiba Semiconductor |
4 / 14 page TA31273FN 2002-07-08 4 Functions 1. Waveform shaper circuit (comparator) The output data (pin 10) are inverted. 2. RSSI function DC potential corresponding to the input level of IF IN (pin 6) is output to RSSI (pin 18). Output to RSSI (pin 18) is converted to a voltage by the internal resistance. Thus, connecting external resistance R to pin 18 varies the gradient of the RSSI output as shown below. Note that due to the displacement of temperature coefficients between external resistor R and the internal IC resistor, the temperature characteristic of the RSSI output may change. Also, the maximum RSSI value should be VCC − 1 V. Figure 1 Figure 2 3. VCC pin and GND pin Use the same voltage supply source for VCC1 (pin 2) and VCC2 (pin 5) (or connect them). Also, use the same voltage supply source for GND1 (pin 15) and GND2 (pin 9) (or connect them). 4. Local oscillator circuit The local oscillator circuit is external-input-only. Input to pin 1 at a level from 95 to 105dB µV. By switching the Lo switch (LOBS), the frequency set by the external circuit can be used as-is without using the x8 circuit. Lo Switch (LOBS) H L Local oscillation status x8 circuit in operation x8 circuit halted/through pass 5. RF amp current adjustment The RF amp current dissipation can be regulated by varying resistor R as shown in the figure below. When R = 1 kΩ, the current dissipation is approximately 800 µA. Figure 3 12 RF DEC 18 IF input level After R is connected |
Аналогичный номер детали - TA31273FN |
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Аналогичное описание - TA31273FN |
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