- 您现在的位置：买卖IC网 > Sheet目录527 > SX1211SKA915 (Semtech)KIT STARTER FOR SX1211 915MHZ
SX1211
WIRELESS & SENSING
or to fill the FIFO buffers with glitch-free data in Buffered mode. The operation of the receiver is now described in
detail.
Note: Image rejection is achieved by the SAW filter.
3.4.2. LNA and First Mixer
In receive mode, the RFIO pin is connected to a fixed gain, common-gate, Low Noise Amplifier (LNA). The
performance of this amplifier is such that the Noise Figure (NF) of the receiver can be estimated to be ≈ 7 dB.
3.4.3. IF Gain and Second I/Q Mixer
Following the LNA and first down-conversion, there is an IF amplifier whose gain can be programmed from -
13.5 dB to 0 dB in 4.5 dB steps, via the register MCParam_IF_gain. The default setting corresponds to 0 dB gain,
but lower values can be used to increase the RSSI dynamic range. Refer to section 3.4.7 for additional information.
3.4.4. Channel Filters
The second mixer stages are followed by the channel select filters. The channel select filters have a strong
influence on the noise bandwidth and selectivity of the receiver and hence its sensitivity. Each filter comprises a
passive and active section.
3.4.4.1. Passive Filter
Each channel select filter features a passive second-order RC filter, with a bandwidth programmable through the
bits RXParam_PassiveFilt. As the wider of the two filters, its effect on the sensitivity is negligible, but its bandwidth
has to be setup instead to optimize blocking immunity. The value entered into this register sets the single side
bandwidth of this filter. For optimum performance it should be set to 3 to 4 times the cutoff frequency of the active
Butterworth (or polyphase) filter described in the next section.
3 * Fc ButterfFil t ≤ BW passive , filter ≤ 4 * Fc ButterFilt
3.4.4.2. Active Filter
The ’fine’ channel selection is performed by an active, third-order, Butterworth filter, which acts as a low-pass filter
for the zero-IF configuration (FSK), or a complex polyphase filter for the Low-IF (OOK) configuration. The
RXParam_PolypFilt_on bit enables/disables the polyphase filter.
Low-pass filter for FSK ( RXParam_PolyFilt_on=’’0’’)
-f C
0
f C
f requency
Polyphase filter for OOK ( RXParam_PolyFilt_on=’’1’’ )
Canceled side of
the polyphase filter
-f C
-f o
0
f requency
Figure 17: Active Channel Filter Description
Rev 8 – February 2013
Page 24 of 92
www.semtech.com
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
SX1223SK868
KIT STARTER FOR XE1223 868MHZ
SX1231-31SKB915
TVS
SX1240SKA433
TVS
SX1701BI085TRT
IC AMP 2.5GHZ 5.3V 16-MLPQ
TA002-10002
LED HEATSINK W/FAN 12V 40X10MM
TC620HEPA
IC TEMP SNSR 5V DUAL TRIP 8-DIP
TC623CVOA713
IC TEMP SNSR 3V DUAL TRIP 8-SOIC
TC624VOA
IC TEMP SNSR PROG 2.7V 8SOIC
相关代理商/技术参数
SX1212
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Ultra-Low Power Integrated 300-510MHz Transceiver
SX1212-11SKA433
制造商:Semtech Corporation 功能描述:SX1212 433Mhz USB Kit With 2 SX1212-01SKA433SMA, Antenna Connector, RS232 Cable
SX1212-12SKA433
制造商:Semtech Corporation 功能描述:2 X SX1212SKA 制造商:Semtech Corporation 功能描述:Deluxe USB Starter Kit for SX1212, Includes Two USB Interface Boards at 433MHz 制造商:Semtech 功能描述:2 X SX1212SKA
SX1212-DK7A433
制造商:Semtech Corporation 功能描述:Evaluation Board for SX1212 Transceiver
SX1212IWLTRT
功能描述:IC TXRX 300MHZ-510MHZ 32-TQFN RoHS:是 类别:RF/IF 和 RFID >> RF 收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program 标准包装:30 系列:- 频率:4.9GHz ~ 5.9GHz 数据传输率 - 最大:54Mbps 调制或协议:* 应用:* 功率 - 输出:-3dBm 灵敏度:- 电源电压:2.7 V ~ 3.6 V 电流 - 接收:* 电流 - 传输:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 工作温度:-25°C ~ 85°C 封装/外壳:68-TQFN 裸露焊盘 包装:管件
SX1213
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Ultra-Low Power Integrated UHF Receiver
SX1213IWLTRT
制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:SX1213 Series 510 MHz 200 Kbps Ultra-Low Power Integrated UHF Receiver - TQFN-32
SX1223
制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:425 - 475 MHz / 850 - 950 MHz Integrated UHF Transmitter