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参数资料
| 型号： | SX1211I084TRT |
| 厂商： | Semtech |
| 文件页数： | 29/92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
RSSI
(dB)
‘’Peak -6dB’’ Threshold
‘’Floor’’ threshold defined by
MCParam_OOK_floor_thresh
Noise floor of
receiver
Time
Zoom
Decay in dB as defined in
RXPAram_OOK_thresh_step
Fixed 6dB difference
Period as defined in
RXParam_OOK_thresh_dec_period
Figure 22: OOK Demodulator Description
In peak threshold mode the comparison threshold level is the peak value of the RSSI, reduced by 6dB. In the
absence of an input signal or during the reception of a logical “0”, the acquired peak value is decremented by one
RXPAram_OOK_thresh_step every RXParam_OOK_thresh_dec_period.
When the RSSI output is null for a long time (for instance after a long string of “0” received, or if no transmitter is
present), the peak threshold level will continue falling until it reaches the “Floor Threshold” that is programmed
through the register MCParam_OOK_floor_thresh.
The default settings of the OOK demodulator lead to the performance stated in the electrical specification.
However, in applications in which sudden signal drops are awaited during a reception, the three parameters shall
be optimized accordingly.
3.4.10.1. Optimizing the Floor Threshold
MCParam_OOK_floor_thres determines the sensitivity of the OOK receiver, as it sets the comparison threshold for
weak input signals (i.e. those close to the noise floor). Significant sensitivity improvements can be generated if
configured correctly.
Note that the noise floor of the receiver at the demodulator input depends on:
The noise figure of the receiver.
The gain of the receive chain from antenna to base band.
The matching - including SAW filter.
The bandwidth of the channel filters.
It is therefore important to note that the setting of MCParam_OOK_floor_thresh will be application dependant. The
following procedure is recommended to optimize MCParam_OOK_floor_thresh.
Rev 8 – February 2013
Page 29 of 92
www.semtech.com
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