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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

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

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 57 58

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