CC2400-RTR1 datasheet(50/83 Pages) TI

50 / 83 page

CC2400

SWRS042A

Page 50 of 83

Table 20. 16MHz crystal oscillator component values for CL=16pF

44 Input / Output Matching

The RF input / output is differential (RF_N

and RF_P). In addition there is supply

switch output pin (TXRX_SWITCH) that

must have an external DC path to RF_N

and RF_P.

In RX mode the TXRX_SWITCH pin is at

ground and will bias the LNA. In TX mode

the TXRX_SWITCH pin is at supply rail

voltage and will properly bias the internal

PA.

The RF output and DC bias can be

achieved

using

different

topologies.

Application circuits are shown in Figure 3

and Figure 4. Component values are given

in Table 11.

If a single ended output is required (for a

single ended connector or a single ended

antenna), a balun should be used. The

balun can be realized using discrete

inductors and capacitors.

Using a differential antenna, no balun is

required.

45 Typical performance graphs

The following graphs show how some

important

parameters

vary

with

temperature. These graphs show typical

performance as a function of temperature,

and should be used as design guidance

only.

-40

-20

20406080

Temp (deg C)

RX Current

TX Current

Figure 24 Typical RX and TX current vs. temperature

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