CC1110-RTR1 datasheet(17/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 17 of 202

7.7

High Speed RC Oscillator

TA=25°C, VDD=3.0V if nothing else is stated.

Parameter

Min

Typ

Max

Unit

Condition/Note

Frequency

MHz

Calibrated High Speed RC Oscillator

frequency is XTAL frequency multiplied by 1/2

Uncalibrated frequency

accuracy

±15

Calibrated frequency

accuracy

±1

Start-up time

µs

Temperature coefficient

-325

ppm /

°C

Frequency drift when temperature changes

after calibration

Supply voltage coefficient

ppm / V

Frequency drift when supply voltage changes

after calibration

Initial calibration time

µs

When the High Speed RC Oscillator is

enabled, calibration is continuously done in the

background as long as the crystal oscillator is

running.

Table 11: High Speed RC Oscillator parameters

7.8

Frequency Synthesizer Characteristics

TA=25°C, VDD=3.0V if nothing else stated. Measured on Chipcon’s CC1110 EM reference design.

Parameter

Min

Typ

Max

Unit

Condition/Note

Programmed

frequency resolution

397

FXOSC/

412

26MHz-27MHz 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.

PLL turn-on / hop time

µs

Time from leaving the IDLE state (see Figure 38) until

arriving in the RX, FSTXON or TX state, when not

performing calibration.

Crystal oscillator running.

PLL RX/TX and

TX/RX settling time

µs

Settling time for the 1xIF frequency step from RX to TX,

and vice versa.

PLL calibration time

0.69

18739

0.72

XOSC

cycles

Calibration can be initiated manually, or automatically

before entering or after leaving RX/TX.

Min/typ/max time is for 27/26/26MHz crystal frequency.

Table 12: Frequency Synthesizer Parameters

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