1250 datasheet(7/50 Pages) TI

Part #	1250

Description	Single Chip Low Cost Low Power RF-Transmitter

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CC2550

Preliminary Data Sheet (rev. 1.1)

SWRS039

Page 7 of 51

7

Crystal Oscillator

Tc = 25

°C @ VDD = 3.0V if nothing else is stated.

Parameter

Min

Typ

Max

Unit

Condition/Note

Crystal frequency

26

27

MHz

Tolerance

±40

ppm

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

and c) temperature dependence.

The acceptable crystal tolerance depends on RF frequency and

channel spacing / bandwidth.

ESR

100

Ω

Start-up time

300

µs

Measured on Chipcon’s CC2500EM reference design.

Table 6:Crystal Oscillator Parameters

8

Frequency Synthesizer Characteristics

Tc = 25

°C @ VDD = 3.0V if nothing else is stated. The values are preliminary results and will be updated in later versions

of the data sheet.

Parameter

Min

Typ

Max

Unit

Condition/Note

Programmed

frequency resolution

397

FXOSC/

2

16

412

Hz

26MHz-27MHz crystal.

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

–76

dBc/Hz

@ 50kHz offset from carrier

RF carrier phase noise

–76

dBc/Hz

@ 100kHz offset from carrier

RF carrier phase noise

–79

dBc/Hz

@ 200kHz offset from carrier

RF carrier phase noise

–87

dBc/Hz

@ 500kHz offset from carrier

RF carrier phase noise

–97

dBc/Hz

@ 1MHz offset from carrier

RF carrier phase noise

–106

dBc/Hz

@ 2MHz offset from carrier

RF carrier phase noise

–116

dBc/Hz

@ 5MHz offset from carrier

RF carrier phase noise

–126

dBc/Hz

@ 10MHz offset from carrier

PLL turn-on / hop time

80

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

0.69

18739

0.72

XOSC

cycles

ms

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 7: Frequency Synthesizer Parameters

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