CC2400_08 Datasheet, PDF (39/84 Pages) Texas Instruments – 2.4 GHz Low-Power RF Transceiver

CC2400
29 Receiver Channel Bandwidth
In order to meet different channel width
and channel spacing requirements, the
receiver’s digital channel filter bandwidth
is programmable. It can be programmed
from 125 to 1000 kHz.
The GRDEC.CHANNEL_DEC[1:0] register
bits control the bandwidth.
The table below summarizes the
selectable channel bandwidths.
Channel filter
bandwidth
[kHz]
1000
500
250
125
GRDEC.CHANNEL_DEC[1:0]
[binary]
00
01
10
11
There is a tradeoff between selectivity and
accepted frequency tolerance. In
applications where larger frequency drift is
expected (depends on the accuracy of the
crystal), the filter bandwidth should be
increased, at the expense of reduced
adjacent channel rejection (ACR).
It is strongly recommended to use one of
the three settings for over-the-air data
rates and channel bandwidths as
described in the section “Data Rate
Programming” on page 40.
SWRS042A
Page 39 of 83