CC2510F8RHHT datasheet(33/245 Pages) TI1

33 / 245 page

CC2510Fx / CC2511Fx

SWRS055G

Page 33 of 236

8.2

Radio

CC2510Fx/CC2511Fx features an RF transceiver

based

the

industry-leading

CC2500,

requiring very few external components. See

Section 13 for details.

Application Circuit

Only a few external components are required

for

using

the

CC2510Fx/CC2511Fx. The

recommended application circuit for

CC2510Fx

is shown in Figure 10. The recommended

application circuits for

CC2511Fx are shown in

Figure 11 and Figure 12. The first of the

recommended

CC2511Fx circuit uses a

fundamental crystal and the second uses a 3

overtone crystal. The external components are

described in Table 28, and typical values are

given in Table 29.

9.1

Bias Resistor

The bias resistor R271 is used to set an

accurate bias current.

9.2

Balun and RF Matching

The

balanced

input

and

output

CC2510Fx/CC2511Fx share two common pins and

are designed for a simple, low-cost matching

and balun network on the printed circuit board.

The

RX-

and

switching

the

CC2510Fx/CC2511Fx front-end are controlled by a

dedicated on-chip function, eliminating the

need for an external RX/TX-switch.

A few passive external components combined

with the internal RX/TX switch/termination

circuitry ensures match in both RX and TX

mode.

Although

CC2510Fx/CC2511Fx has a balanced

RF input/output, the chip can be connected to

a single-ended antenna with few external low

cost capacitors and inductors.

The

passive

matching/filtering

network

connected to

CC2510Fx/CC2511Fx should have

the following differential impedance as seen

from the RF-port (RF_P and RF_N) towards

the antenna:

Zout

= 80 + j74 Ω

C232, C242, and two inductive transmission

PCB lines form the recommended balun that

converts the differential RF port on

CC2510Fx to

a single-ended RF signal. For the

CC2511Fx

balun, the inductive PCB lines are replaced by

L241 and L231. Note that either of the

solutions (PCB lines or discrete components)

can be used for both the chips. C241 and

C231 are needed for DC blocking. Together

with an appropriate LC filter network, the balun

components also transform the impedance to

match a 50

Ω antenna (or cable). Component

values for the RF balun and LC network are

found

the

latest

CC2510EM

and

CC2511Dongle reference designs ([1] and [2]).

Suggested values are also listed in Table 29.

The balun and LC filter component values,

their placement and layout are important in

order

keep

the

performance

the

CC2510Fx/CC2511Fx optimized. It is highly

recommended to follow the CC2510EM /

CC2511Dongle

reference

designs.

Gerber

files and schematics for the reference designs

are available for download from the TI website

9.3

Crystal

The crystal oscillator for the

CC2510Fx uses an

external crystal X1, with two loading capacitors

(C201 and C211) (see Figure 10 and Table

28).

The

CC2511Fx should use a 48 MHz

fundamental (X3) or a 48 MHz 3

rd overtone low

cost external crystal (X4). Depending on the

option selected, different loading capacitors

(C203 and C214 or C202, C212, and C213)

must be used. When X4 is used, an inductor

(L281) must also be connected in series with

C212 (see Figure 11, Figure 12 and Table 28).

The recommended application circuits also

show the connections for an optional 32.768

kHz crystal oscillator with external crystal X2

Note: The high speed crystal oscillator

must

stable

(SLEEP.XOSC_STB=1)

before using the radio.

CC2511F8 - Not Recommended for New Designs

CC2510F8RHHT Datasheet(PDF) 33 Page - Texas Instruments

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