CC2430-RTR1-F64Z datasheet(164/234 Pages) TI

164 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 164 of 232

14 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

TX/RX CONTROL

ADC

DAC

FREQ

SYNTH

Power

Control

FFCTRL

CSMA/CA

STROBE

PROCESSOR

RADIO

BANK

IRQ

HANDLING

SFR bus

Figure 37: CC2430 Radio Module

A simplified block diagram of the IEEE

802.15.4 compliant radio inside

CC2430 is

shown in Figure 37. The radio core is

based on the industry leading

CC2420 RF

transceiver.

CC2430 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 ADCs.

Automatic

gain control, final channel filtering, de-

spreading, symbol correlation and byte

synchronization are performed digitally.

An interrupt indicates that a start of frame

delimiter has been detected.

CC2430

buffers the received data in a 128 byte

receive FIFO. The user may read the FIFO

through

SFR

interface.

recommended to use direct memory

access (DMA) to move data between

memory and the FIFO.

CRC is verified in hardware. RSSI and

correlation values are appended to the

frame. Clear channel assessment, CCA, is

available through an interrupt in receive

mode.

The

CC2430 transmitter is based on direct

up-conversion. The data is buffered in a

128 byte transmit FIFO (separate from the

receive FIFO). 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 PA and LNA is done by

connecting TXRX_SWITCH to RF_P and

RF_N through an external DC path.

The frequency synthesizer includes a

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 –

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