CC2500-RTR1 datasheet(13/96 Pages) TI

13 / 96 page

CC2500

SWRS040C

Page 13 of 89

4.6

Frequency Synthesizer Characteristics

Tc = 25

C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2500EM reference design

([4]). 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/

412

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.

–78

dBc/Hz

@ 50 kHz offset from carrier

–78

dBc/Hz

@ 100 kHz offset from carrier

–81

dBc/Hz

@ 200 kHz offset from carrier

–90

dBc/Hz

@ 500 kHz offset from carrier

–100

dBc/Hz

@ 1 MHz offset from carrier

–108

dBc/Hz

@ 2 MHz offset from carrier

–114

dBc/Hz

@ 5 MHz offset from carrier

RF carrier phase noise

–118

dBc/Hz

@ 10 MHz offset from carrier

PLL turn-on / hop time

85.1

88.4

s

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

s

Settling time for the 1·IF frequency step from RX to TX

PLL TX/RX settling

time

20.7

21.5

s

Settling time for the 1·IF frequency step from TX to RX

PLL calibration time

694

721

s

Calibration can be initiated manually or automatically

before entering or after leaving RX/TX.

Table 9: Frequency Synthesizer Parameters

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