CC1000-RTR2 datasheet(10/59 Pages) TI2

10 / 59 page

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

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

specific

applications. See also “Optional LC filter”

p.36 for further information.

6.4 Power supply decoupling

Power supply decoupling and filtering

must

used

(not

shown

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)

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