Texas Instruments CC2500 User Manual

CC2500
S
WRS040
C
Page
13
of
89
4.6
Frequency Synthesizer Characteristics
Tc = 25

C, VDD = 3.0 V if nothi
ng else stated. All measurement
results obtained
usin
g the CC2500EM reference desi
gn
(
[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
F
XOSC
/
2
16
412
Hz
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 carrie
r
–
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
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 settl
ing
time
9.3
9.6
9.6

s
Settling time for the 1·IF frequency step from RX to TX
PLL TX/RX settling
time
20.7
21.5
21.5

s
Settling time for the 1·IF frequency step from TX to RX
PLL calibration time
694
721
721

s
Calibration can be initiated manually or
automatically
before e
ntering or after leaving RX/TX.
Table
9
: Frequency
S
ynthesizer
P
arameters

Texas Instruments CC2500 Specifications

General

Brand	Texas Instruments
Model	CC2500
Category	Transceiver
Language	English