CC1100-RTY1 datasheet(15/100 Pages) TI1

15 / 100 page

CC1100

SWRS038D

Page 15 of 92

4.5

Low Power RC Oscillator

Tc = 25

°C, VDD = 3.0 V if nothing else is stated. All measurement results obtained using the CC1100EM reference designs ([5]

and [6]).

Parameter

Min

Typ

Max

Unit

Condition/Note

Calibrated frequency

34.7

kHz

Calibrated RC Oscillator frequency is XTAL

frequency divided by 750

Frequency accuracy after

calibration

±1

Temperature coefficient

+0.5

% /

°C

Frequency drift when temperature changes after

calibration

Supply voltage coefficient

% / V

Frequency drift when supply voltage changes after

calibration

Initial calibration time

When the RC Oscillator is enabled, calibration is

continuously done in the background as long as

the crystal oscillator is running.

Table 8: RC Oscillator Parameters

4.6

Frequency Synthesizer Characteristics

Tc = 25

°C @ VDD = 3.0 V if nothing else is stated. All measurement results are obtained using the CC1100EM reference

designs ([5] and [6]). Min figures are given using a 27 MHz crystal. Typ and max are given using a 26 MHz crystal.

Parameter

Min

Typ

Max

Unit

Condition/Note

Programmed frequency

resolution

397

FXOSC/

412

26-27 MHz crystal.

The resolution (in Hz) is equal for all frequency

bands.

Synthesizer frequency

tolerance

±40

ppm

Given by crystal used. Required accuracy

(including temperature and aging) depends on

frequency band and channel bandwidth /

spacing.

RF carrier phase noise

–89

dBc/Hz

@ 50 kHz offset from carrier

RF carrier phase noise

–89

dBc/Hz

@ 100 kHz offset from carrier

RF carrier phase noise

–90

dBc/Hz

@ 200 kHz offset from carrier

RF carrier phase noise

–98

dBc/Hz

@ 500 kHz offset from carrier

RF carrier phase noise

–107

dBc/Hz

@ 1 MHz offset from carrier

RF carrier phase noise

–113

dBc/Hz

@ 2 MHz offset from carrier

RF carrier phase noise

–119

dBc/Hz

@ 5 MHz offset from carrier

RF carrier phase noise

–129

dBc/Hz

@ 10 MHz offset from carrier

PLL turn-on / hop time

85.1

88.4

µs

Time from leaving the IDLE state until arriving in

the RX, FSTXON or TX state, when not

performing calibration.

Crystal oscillator running.

PLL RX/TX settling time

9.3

9.6

µs

Settling time for the 1·IF frequency step from RX

to TX

PLL TX/RX settling time

20.7

21.5

µs

Settling time for the 1·IF frequency step from TX

to RX

PLL calibration time

694

721

µs

Calibration can be initiated manually or

automatically before entering or after leaving

RX/TX.

Table 9: Frequency Synthesizer Parameters

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