Rf Receive Section - Texas Instruments CC2500 TK Manual

4.2

RF Receive Section

Tc = 25C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2500EM reference design
([4]).
Parameter Min
Digital channel filter 58
bandwidth
2.4 kBaud data rate, sensitivity optimized, MDMCFG2.DEM_DCFILT_OFF=0
(2-FSK, 1% packet error rate, 20 bytes packet length, 203 kHz digital channel filter bandwidth)
Receiver sensitivity
Saturation
Adjacent channel
rejection
Alternate channel
rejection
Blocking
±10 MHz offset
±20 MHz offset
±50 MHz offset
10 kBaud data rate, sensitivity optimized, MDMCFG2.DEM_DCFILT_OFF=0
(2-FSK, 1% packet error rate, 20 bytes packet length, 232 kHz digital channel filter bandwidth)
Receiver sensitivity
Saturation
Adjacent channel
rejection
Alternate channel
rejection
Blocking
±10 MHz offset
±20 MHz offset
±50 MHz offset
Typ Max Unit
812 kHz
–104 dBm
–13 dBm
23 dB
31 dB
64 dBm
70 dBm
71 dBm
–99 dBm
–9 dBm
18 dB
25 dB
59 dB
65 dB
66 dB
SWRS040C
Condition/Note
User programmable. The bandwidth limits are
proportional to crystal frequency (given values assume
a 26.0 MHz crystal).
The RX current consumption can be reduced by
approximately 1.7 mA by setting
MDMCFG2.DEM_DCFILT_OFF=
is then -102 dBm and the temperature range is from 0
o
to +85 C.
The sensitivity can be improved to typically –106 dBm
with MDMCFG2.DEM_DCFILT_OFF=
registers TEST2 and TEST1 (see page 82). The
temperature range is then from 0
Desired channel 3 dB above the sensitivity limit. 250
kHz channel spacing
Desired channel 3 dB above the sensitivity limit. 250
kHz channel spacing
See Figure 22 for plot of selectivity versus frequency
offset
Wanted signal 3 dB above sensitivity level.
Compliant with ETSI EN 300 440 class 2 receiver
requirements.
The RX current consumption can be reduced by
approximately 1.7 mA by setting
MDMCFG2.DEM_DCFILT_OFF=
is then -97 dBm
The sensitivity can be improved to typically –101 dBm
with MDMCFG2.DEM_DCFILT_OFF=
registers TEST2 and TEST1 (see page 82). The
temperature range is then from 0
Desired channel 3 dB above the sensitivity limit. 250
kHz channel spacing
Desired channel 3 dB above the sensitivity limit. 250
kHz channel spacing
See Figure 23 for plot of selectivity versus frequency
offset
Wanted signal 3 dB above sensitivity level.
Compliant with ETSI EN 300 440 class 2 receiver
requirements.
CC2500
1
. The typical sensitivity
o
C
0
by programming
o o
C to +85 C.
1
. The typical sensitivity
0
by programming
o o
C to +85 C.
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