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參數(shù)資料
| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 16/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 16 of 89
Circuit Description
Figure 2. The EM2420 simplified block diagram
A simplified block diagram of the
EM2420
is
shown in Figure 2.
The
EM2420
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.
When the
SFD
pin goes high, this indicates
that a start of frame delimiter has been
detected. The
EM2420
buffers the received
data in a 128 byte receive FIFO. The user
may read the FIFO through a 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
purposes.
are
also
available
for
test
The
EM2420
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 very 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
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| EM242302 | 功能描述:柵欄接線端子 EURO MC421-38102 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類(lèi)型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類(lèi)型:Screw 觸點(diǎn)電鍍:Tin |
| EM242303 | 功能描述:柵欄接線端子 EURO MC421-38103 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類(lèi)型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類(lèi)型:Screw 觸點(diǎn)電鍍:Tin |
| EM242608H | 功能描述:可插拔接線端子 EuroMag Pluggable Terminal Block RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Plugs 系列:PTS 端接類(lèi)型:Spring Cage 位置/觸點(diǎn)數(shù)量:5 線規(guī)量程:26-14 節(jié)距:5 mm 電流額定值:10 A 電壓額定值:250 V 安裝風(fēng)格: 安裝角: 觸點(diǎn)電鍍: |
| EM-24346-C36 | 功能描述:麥克風(fēng) 3.61 X 3.61 X 2.21MM -52 SENS, 12SL PORT RoHS:否 制造商:Knowles Acoustics 方向性:Omnidirectional 阻抗:4.4 K Ohms 工作電壓:0.9 V to 10 V 靈敏度:- 53 dB 端接類(lèi)型:Wire Leads 長(zhǎng)度:5.56 mm 寬度:3.98 mm 深度:2.21 mm |
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