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ADF7020BCP Datasheet(PDF) 15 Page - Analog Devices |
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ADF7020BCP Datasheet(HTML) 15 Page - Analog Devices |
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15 / 40 page  Preliminary Technical Data ADF7020 Rev. PrH | Page 15 of 40 Gaussian Frequency Shift Keying (GFSK) Gaussian frequency shift keying reduces the bandwidth occupied by the transmitted spectrum by digitally prefiltering the TxData. A TxCLK output line is provided from the ADF7020 for synchronization of TxData from the micro- controller. The TxCLK line can be connected to the clock input of a shift register that clocks data to the transmitter at the exact data rate. Setting Up the ADF7020 for GFSK To set up the frequency deviation, set the PFD and the mod control bits: 12 2 2 ] Hz [ m DEVIATION PFD GFSK × = where m is GFSK_MOD_CONTROL set using R2_DB(24:26). To set up the GFSK data rate: COUNTER INDEX FACTOR DIVIDER PFD DR _ _ ] bps [ × = For further information, see the application note, Using GFSK on the ADF7010, in the EVAL-ADF7010EB1 Technical Note. Amplitude Shift Keying (ASK) Amplitude shift keying is implemented by switching the output stage between two discrete power levels. This is accomplished by toggling the DAC, which controls the output level between two 6-bit values set up in Register 2. A zero TxData bit sends Bits R2_DB(15:20) to the DAC. A high TxData bit sends Bits R2_DB(9:14) to the DAC. A maximum modulation depth of 30 dB is possible. On-Off Keying (OOK) On-off keying is implemented by switching the output stage to a certain power level for a high TxData bit and switching the output stage off for a zero. For OOK, the transmitted power for a high input is programmed using Bits R2_DB(9:14). Gaussian On-Off Keying (G-OOK) Gaussian on-off keying represents a prefiltered form of OOK modulation. The usually sharp symbol transitions are replaced with smooth Gaussian filtered transitions, the result being a reduction in frequency pulling of the VCO. Frequency pulling of the VCO in OOK mode can lead to a wider than desired BW, especially if it is not possible to increase the loop filter BW > 300 kHz. The G-OOK sampling clock samples data at the data rate. (See the Setting Up the ADF7020 for GFSK section.) |
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