CC1150_13 datasheet(11/67 Pages) TI

Part #	CC1150

Description	Low Power Sub-1 GHz RF Transmitter

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CC1150

SWRS037A

Page 11 of 60

6

Circuit Description

BIAS

XOSC_Q1 XOSC_Q2

XOSC

FREQ

SYNTH

RADIO CONTROL

RF_P

RF_N

CSn

SI

SO (GDO1)

SCLK

GDO0 (ATEST)

RBIAS

PA

Figure 2:

CC1150 Simplified Block Diagram

A simplified block diagram of

CC1150 is shown

in Figure 2.

The

CC1150 transmitter is based on direct

synthesis of the RF frequency. The frequency

synthesizer includes a completely on-chip LC

VCO.

A crystal is to be connected to XOSC_Q1 and

XOSC_Q2. The crystal oscillator generates the

reference frequency for the synthesizer, as

well as clocks for the digital part.

A 4-wire SPI serial interface is used for

configuration and data buffer access.

The digital baseband includes support for

channel configuration, packet handling and

data buffering.

7

Application Circuit

Only a few external components are required

for using the

CC1150. The recommended

application circuits are shown in Figure 4 and

Figure 5. The external components are

described in Table 13, and typical values are

given in Table 14.

7.1

Bias resistor

The bias resistor R141 is used to set an

accurate bias current.

7.2

Balun and RF matching

The components between the RF_N/RF_P

pins and the point where the two signals are

joined together (C111, C101, L101 and L111

for the 315/433 MHz design. L101, L111,

C101, L102, C111, C102 and L112 for the

868/915 MHz reference design) form a balun

that converts the differential RF signal on

CC1150 to a single-ended RF signal. C104 is

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). C105

provides DC blocking and is only needed if

there is a DC path in the antenna. For the

868/915

MHz

reference

design,

this

component may also be used for additional

filtering, see section 7.5 below.

Suggested values for 315 MHz, 433 MHz and

868/915 MHz are listed in Table 14.

The balun and LC filter component values and

their placement are important to achieve

optimal

performance.

It

is

highly

recommended to follow the CC1150EM

reference design ([1] and [2]). Gerber files and

schematics for the reference designs are

available for download from the TI website.

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