參數(shù)資料
型號： CC2420
廠商： Electronic Theatre Controls, Inc.
英文描述： 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
中文描述： 2.4 GHz IEEE 802.15.4標準/ ZigBee功能的RF收發(fā)器
文件頁數(shù)： 16/87頁
文件大小： 1418K
代理商： CC2420
SmartRF
CC2420
Circuit Description
S
m
i
LNA
DIGITAL
DEMODULATOR
- Digital RSSI
- Gain Control
- Image Suppression
- Channel Filtering
- Demodulation
- Frame
synchronization
DIGITAL
MODULATOR
- Data spreading
- Modulation
On-chip
BIAS
DIGITAL
INTERFACE
WITH FIFO
BUFFERS,
CRC AND
ENCRYPTION
C
Σ
AUTOMATIC GAIN CONTROL
TX POWER CONTROL
TX/RX CONTROL
XOSC
16 MHz
R
ADC
ADC
DAC
DAC
0
90
FREQ
SYNTH
SmartRF
CC2420
Power
Control
PA
Serial
voltage
regulator
Digital and
Analog test
interface
Figure 2.
CC2420
simplified block diagram
A simplified block diagram of
CC2420
is
shown in Figure 2.
CC2420
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
synchronisation are performed digitally.
When the
SFD
pin goes high, this indicates
that a start of frame delimiter has been
detected.
CC2420
buffers the received data
in a 128 byte receive FIFO. The user may
read the FIFO through an SPI interface.
CRC is verified in hardware. RSSI and
correlation values are appended to the
frame. CCA is available on a pin in receive
mode. Serial (unbuffered) data modes are
also available for test purposes.
The
CC2420
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
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).
generated
by
An analog lowpass filter passes the signal
to the quadrature (I and Q) upconversion
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
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 16 of 87
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CC2420/T&R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
CC2420/TR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
CC2420DBK 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 DEMO KIT 2 DEMO BOARDS RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
CC2420DK 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 DEVELOPMENT KIT RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
CC2420EMK 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 EVALUATION KT (2)PCBs & (2)ANTENNA RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
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