CC1010-RTY1 datasheet(120/152 Pages) TI

120 / 152 page

CC1010

SWRS047

Page 120 of 152

17.18 Input / Output Matching

A few passive external components

combined with the internal T/R switch

circuitry ensures match in both RX and TX

mode. The matching network is shown in

Figure 36. Component values for various

frequencies are given in Table 28.

Component values for other frequencies

can be found using the SmartRF

® Studio

software.

The register MATCH should initially be set

as shown in the register description below.

The MATCH register controls a capacitor

array located at the RF_OUT pin. The

impedance match for a particular layout

and component selection. The tuning can

be accomplished by stepping the register

values until optimum sensitivity and output

power is reached.

RF_IN

RF_OUT

TO ANTENNA

CC1010

L51

C51

C52

AVDD=3V

L42

C41

Figure 36. Input/output matching network

MATCH (0xDC) - Match Capacitor Array Control Register

Bit

Name

R/W

Reset value

Description

7:3

RX_MATCH

(3:0)

R/W

0000

Selects matching capacitor array value for RX, step size is

0.4 pF

0000: Use for RF frequency > 500 MHz

1100: Use for RF frequency < 500 MHz

3:0

TX_MATCH

(3:0)

R/W

0000

Selects matching capacitor array value for TX, step size is

0.4 pF. Recommended setting is 0000

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