参数资料
型号: SX1212IWLTRT
厂商: Semtech
文件页数: 28/77页
文件大小: 0K
描述: IC TXRX 300MHZ-510MHZ 32-TQFN
标准包装: 1
频率: 300MHz ~ 510MHz
数据传输率 - 最大: 150kbps
调制或协议: FSK,OOK
应用: AMR,ISM,家庭自动化,程序控制
功率 - 输出: 12.5dBm
灵敏度: -110dBm
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)
其它名称: SX1212IWLDKR
SX1212
ADVANCE D COMMUNICATIONS & SENSING
RXParam_RSSI_val(7:0)
24 26 27 30 25 20 20 20 18 22 33 20 22 34 33
IRQParam_RSSI_irq
Clear interrupt
Figure 21: RSSI IRQ Timings
3.4.8. Fdev Setting in Receive Mode
The effect of the Fdev setting is different between FSK and OOK modes:
3.4.8.1. FSK Rx Mode
In FSK mode the Fdev setting, as configured by MCParam_Freq_Dev, sets sampling frequencies on the receiver.
The user should make it consistent with the frequency deviation of the FSK signal that is received.
3.4.8.2. OOK Rx Mode
The frequency deviation Fdev, as described above, sets the sampling rate of the RSSI block. It is therefore
necessary to set Fdev to the recommended low-IF frequency, IF2, of 100 kHz:
Fdev = IF 2 = 100 kHz
MCParam _ Freq _ dev = " 00000011 "
3.4.9. FSK Demodulator
The FSK demodulator provides data polarity information, based on the relative phase of the input I and Q signals at
the baseband. Its outputs can be fed to the Bit Synchronizer to recover the timing information. The user can also
use the raw, unsynchronized, output of the FSK demodulator in Continuous mode.
The FSK demodulator of the SX1212 operates most effectively for FSK signals with a modulation index greater
than or equal to two:
β =
2 * Fdev
BR
≥ 2
3.4.10. OOK Demodulator
The OOK demodulator performs a comparison of the RSSI output and a threshold value. Three different threshold
modes are available, programmed through the RXParam_OOK_thresh_type register.
The recommended mode of operation is the “Peak” threshold mode, illustrated below in Figure 22:
Rev 2 – June 18th, 2009
Page 28 of 77
www.semtech.com
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