CC1010-RTR1 datasheet(85/152 Pages) TI

85 / 152 page

CC1010

SWRS047

Page 85 of 152

17.3 RF Application Circuit

Very

few

external

components

are

required

for

operation

the

transceiver. A typical application circuit is

shown in Figure 20. Component values are

shown in Table 28.

17.3.1

Input / output matching

C31/L32 is the input match for the

receiver, and L32 is also used as a DC

choke for biasing. C41, L41 and C42 are

used to match the transmitter to a 50-Ohm

load. An internal T/R switch circuit makes

it possible to connect the input and output

together and match the transceiver to 50

Ω in both RX and TX mode. See the Input

/ Output Matching section on page 126 for

details.

17.3.2

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 for any operation frequency.

17.3.3

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 the Optional LC

Filter section on page 128 for further

information. If a SAW filter is used, it

should be included in the RX path only (an

external RX/TX switch should then be

used).

17.3.4

Voltage supply decoupling

Voltage supply filtering and de-coupling

capacitors must be used (not shown in the

application

circuit).

These

capacitors

should be placed as close as possible to

the voltage supply pins of

CC1010.

The placement and size of the decoupling

capacitors and power supply filtering are

very important to achieve the best

sensitivity and lowest possible LO leakage

and the reference layouts should be

followed.

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