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CC1000-RTR2 Datasheet(PDF) 24 Page - Texas Instruments |
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CC1000-RTR2 Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 55 page  CC1000 SWRS048A Page 24 of 55 synthesis PLL is near the limit of generate the frequency requested, and the PLL should be recalibrated. It is recommended that the LOCK_CONTINOUS bit in the LOCK register is checked when changing frequencies and when changing between RX and TX mode. If lock is not achieved, a calibration should be performed. 15. Recommended RX settings for ISM frequencies Shown in Table 9 are the recommended RX frequency synthesiser settings for a few operating frequencies in the popular ISM bands. These settings ensure optimum configuration of the synthesiser in receive mode for best sensitivity. For some settings of the synthesiser (combinations of RF frequencies and reference frequency), the receiver sensitivity is degraded. The FSK frequency separation is set to 64 kHz. The SmartRF ® Studio can be used to generate optimised configuration data as well. Also an application note (AN011) and a spreadsheet are available from Chipcon generating configuration data for any frequency giving optimum sensitivity. ISM Frequency [MHz] Actual frequency [MHz] Crystal frequency [MHz] Low-side / high- side LO* Reference divider REFDIV (decimal) Frequency word RX mode FREQ (decimal) Frequency word RX mode FREQ (hex) 315 315.037200 3.6864 High-side 3 4194304 400000 7.3728 6 4194304 400000 11.0592 9 4194304 400000 14.7456 12 4194304 400000 433.3 433.302000 3.6864 Low-side 3 5775168 580000 7.3728 6 5775168 580000 11.0592 9 5775168 580000 14.7456 12 5775168 580000 433.9 433.916400 3.6864 Low-side 3 5775360 582000 7.3728 6 5775360 582000 11.0592 9 5775360 582000 14.7456 12 5775360 582000 434.5 434.530800 3.6864 Low-side 3 5783552 584000 7.3728 6 5783552 584000 11.0592 9 5783552 584000 14.7456 12 5783552 584000 868.3 868.297200 3.6864 Low-side 2 7708672 75A000 7.3728 4 7708672 75A000 11.0592 6 7708672 75A000 14.7456 8 7708672 75A000 868.95 868.918800 3.6864 High-side 2 7716864 75C000 7.3728 4 7716864 75C000 11.0592 6 7716864 75C000 14.7456 7716864 75C000 869.525 869.526000 3.6864 Low-side 3 11583488 B0C000 7.3728 6 11583488 B0C000 11.0592 9 11583488 B0C000 14.7456 12 11583488 B0C000 869.85 869.840400 3.6864 High-side 2 7725056 75E000 7.3728 4 7725056 75E000 11.0592 6 7725056 75E000 14.7456 8 7725056 75E000 915 914.998800 3.6864 High-side 2 8126464 7C0000 7.3728 4 8126464 7C0000 11.0592 6 8126464 7C0000 14.7456 8 8126464 7C0000 *Note: When using high-side LO injection the data at DIO will be inverted. Table 9. Recommended settings for ISM frequencies |
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