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MC13150FTB Arkusz danych(PDF) 9 Page - LANSDALE Semiconductor Inc. |
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MC13150FTB Arkusz danych(HTML) 9 Page - LANSDALE Semiconductor Inc. |
9 / 20 page LANSDALE Semiconductor, Inc. ML13150 Figure 15. Application Circuit NOTES: 1. Alternate solution is 1:4 impedance transformer (sources include Mini Circuits, Coilcraft and Toko). 2. 455 kHz ceramic filters (source Murata CFU455 series which are selected for various bandwidths). 3. For external LO source, a 51 Ω pullup resistor is used to bias the base of the on–board transistor as shown in Figure 15. Designer may provide local oscillator with 3rd, 5th, or 7th overtone crystal oscillator circuit. The PC board is laid out to accommodate external components needed for a Butler emitter coupled crystal oscillator (see Figure 16). 4. Enable IC by switching the pin to VEE. 5. The resistor is chosen to set the range of RSSI voltage output swing. 6. Details regarding the external components to setup the coilless detector are provided in the application section. 32 31 30 29 28 27 26 25 9 10 11 12 1314 1516 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 (3) LO Input (4) Enable (5) RSSI RSSI Buffer Detector Output RL 150 k RS 150 k 1.0 n 100 n 100 n 1.0 µ CT + 560 k RB 150 k RT 12 k RF (6) Coilless Detector Circuit 10 µ VCC 100 n 100 n 455 kHz IF Ceramic Filter 1.0 n 1.0 n 100 n (2) 455 kHz IF Ceramic Filter 100 n RF/IF Input 11 p (1) 180 nH 100 n 51 82 k VEE1 Mixer VCC1 Local Oscillator RSSI Buffer IF VCC2 VEE2 Limiter (6) Legacy Applications Information www.lansdale.com Page 9 of 20 Issue A |
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