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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CC1021-RTR1 датащи(PDF) 44 Page - Texas Instruments |
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CC1021-RTR1 датащи(HTML) 44 Page - Texas Instruments |
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44 / 92 page  CC1021 SWRS045 Page 44 of 91 13. Transmitter 13.1. FSK Modulation Formats The data modulator can modulate FSK, which is a two level FSK (Frequency Shift Keying), or GFSK, which is a Gaussian filtered FSK with BT = 0.5. The purpose of the GFSK is to make a more bandwidth efficient system. The modulation and the Gaussian filtering are done internally in the chip. The TX_SHAPING bit in the DEVIATION register enables the GFSK. Figure 22 shows a typical eye diagram for 153.6 kBaud data rate at 868 MHz operation. Figure 22. GFSK eye diagram. 153.6 kBaud, NRZ, ±79.2 kHz frequency deviation. 13.2. Output Power Programming The RF output power from the device is programmable by the 8-bit PA_POWER register. Figure 23 and Figure 24 shows the output power and total current consumption as a function of the PA_POWER register setting. It is more efficient in terms of current consumption to use either the lower or upper 4-bits in the register to control the power, as shown in the figures. However, the output power can be controlled in finer steps using all the available bits in the PA_POWER register. |
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