CC2480 datasheet(29/48 Pages) TI

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CC2480

10 Radio

LNA

DIGITAL

DEMODULATOR

- Digital RSSI

- Gain Control

- Image Suppression

- Channel Filtering

- Demodulation

- Frame

synchronization

DIGITAL

MODULATOR

- Data spreading

- Modulation

AUTOMATIC GAIN CONTROL

TX POWER CONTROL

TXRX SWITCH

ADC

DAC

FREQ

SYNTH

Power

Control

FFCTRL

CSMA/CA

STROBE

PROCESSOR

RADIO

BANK

IRQ

HANDLING

SFR bus

Figure 9: CC2480 Radio Module

A simplified block diagram of the IEEE

802.15.4 compliant radio inside

CC2480 is

shown in Figure 9. The radio core is based on

the industry leading

CC2420 RF transceiver.

CC2480 features a low-IF receiver. The

received RF signal is amplified by the low-

noise amplifier (LNA) and down-converted in

quadrature (I and Q) to the intermediate

frequency (IF). At IF (2 MHz), the complex I/Q

signal is filtered and amplified, and then

digitized by the RF receiver ADCs.

The

CC2480 transmitter is based on direct up-

conversion. The preamble and start of frame

delimiter are generated in hardware. Each

symbol (4 bits) is spread using the IEEE

802.15.4 spreading sequence to 32 chips and

output to the digital-to-analog converters

(DACs).

An analog low pass filter passes the signal to

the quadrature (I and Q) up-conversion mixers.

The RF signal is amplified in the power

amplifier (PA) and fed to the antenna.

The internal T/R switch circuitry makes the

antenna interface and matching easy. The RF

connection is differential. A balun may be used

for single-ended antennas. The biasing of the

and

LNA

done

connecting

TXRX_SWITCH

to RF_P and RF_N through an

external DC path.

The

frequency

synthesizer

includes

completely on-chip LC VCO and a 90 degrees

phase splitter for generating the I and Q LO

signals to the down-conversion mixers in

receive mode and up-conversion mixers in

transmit mode. The VCO operates in the

frequency range 4800 – 4966 MHz, and the

frequency is divided by two when split into I

and Q signals.

An on-chip voltage regulator delivers the

regulated 1.8 V supply voltage.

CC2480 Data Sheet SWRS074

Page 29 of 43

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