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| 型号： | SX1211I084TRT |
| 厂商： | Semtech |
| 文件页数： | 24/92页 |
| 文件大小： | 0K |
| 描述： | IC SNGL-CHIP TXRX 32-TQFN |
| 标准包装： | 1 |
| 频率： | 860 ~ 960MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK，OOK |
| 应用： | AMR，ISM，安防门禁 |
| 功率 - 输出： | 12.5dBm |
| 灵敏度： | -113dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 3mA |
| 电流 - 传输： | 25mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-TQFN |
| 包装： | 标准包装 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
| 配用： | 1210-1060-2-ND - 915MHZ ASPICS SX1211 CHIP SET 1210-1059-2-ND - 868MHZ ASPICS SX1211 CHIP SET 1210-1060-6-ND - 915MHZ ASPICS SX1211 CHIP SET 1210-1059-6-ND - 868MHZ ASPICS SX1211 CHIP SET 1210-1060-1-ND - 915MHZ ASPICS SX1211 CHIP SET 1210-1059-1-ND - 868MHZ ASPICS SX1211 CHIP SET |
| 其它名称： | SX1211I084DKR |
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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
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