CC1000
SWRS048A Page 10 of 55
6. Application Circuit
Very few external components are
required for the operation of
CC1000
. A
typical application circuit is shown in
Figure 2. Component values are shown in
Table 1.
6.1 Input / output matching
C31/L32 is the input match for the
receiver. L32 is also a DC choke for
biasing. C41, L41 and C42 are used to
match the transmitter to 50
Ω
. An internal
T/R switch circuit makes it possible to
connect the input and output together and
match the
CC1000
to 50
Ω
in both RX and
TX mode. See “Input/output matching”
p.31 for details.
6.2 VCO inductor
The VCO is completely integrated except
for the inductor L101.
Component values for the matching
network and VCO inductor are easily
calculated using the SmartRF
®
Studio
software.
6.3 Additional filtering
Additional external components (e.g. RF
LC or SAW-filter) may be used in order to
improve the performance in specific
applications. See also “Optional LC filter”
p.36 for further information.
6.4 Power supply decoupling
Power supply decoupling and filtering
must be used (not shown in the
application circuit). The placement and
size of the decoupling capacitors and the
power supply filtering are very important to
achieve the optimum performance.
Chipcon provides reference designs
(CC1000PP and CC1000uCSP_EM) that
should be followed very closely.
Figure 2. Typical
CC1000
application circuit (power supply decoupling not shown)
