CC2550-RTY1 datasheet(7/62 Pages) TI2

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CC2550

SWRS039B

Page 7 of 58

4.3

Crystal Oscillator

Tc = 25

°C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2550EM reference design

([3]).

Parameter

Min

Typ

Max

Unit

Condition/Note

Crystal frequency

MHz

Tolerance

±40

ppm

This is the total tolerance including a) initial tolerance, b) crystal

loading, c) aging and d) temperature dependence.

The acceptable crystal tolerance depends on RF frequency and

channel spacing / bandwidth.

ESR

100

Ω

Start-up time

150

µs

Measured on CC2500EM reference design ([3]) using crystal

AT-41CD2 from NDK.

This parameter is to a large degree crystal dependent.

Table 6: Crystal Oscillator Parameters

4.4

Frequency Synthesizer Characteristics

Tc = 25

°C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2550EM reference design

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

Parameter

Min

Typ

Max

Unit

Condition/Note

Programmed

frequency resolution

397

FXOSC/

427

26-27 MHz crystal.

Synthesizer frequency

tolerance

±40

ppm

Given by crystal used. Required accuracy (including

temperature and aging) depends on frequency band and

channel bandwidth / spacing.

–74

dBc/Hz

@ 50 kHz offset from carrier

–74

dBc/Hz

@ 100 kHz offset from carrier

–77

dBc/Hz

@ 200 kHz offset from carrier

–97

dBc/Hz

@ 1 MHz offset from carrier

–106

dBc/Hz

@ 2 MHz offset from carrier

–114

dBc/Hz

@ 5 MHz offset from carrier

RF carrier phase noise

@2440 MHz

–117

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

FSTXON or TX state, when not performing calibration.

Crystal oscillator running.

PLL calibration time

694

721

µs

Calibration can be initiated manually or automatically

before entering or after leaving RX/TX.

Table 7: Frequency Synthesizer Parameters

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