参数资料
型号: SX1211I084TRT
厂商: Semtech
文件页数: 23/92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
SX1211
WIRELESS & SENSING
3.4. Receiver Description
The SX1211 is set to receive mode when MCParam_Chip_mode = 011.
First down-
conversion
Second down-
conversion
RSSI
OOK
demod
Bit
synchronizer
Control logic
-Pattern recognition
-FIFO handler
-SPI interface
-Packet handler
LNA
RF
LO1 Rx
IF1
LO2 Rx
FSK
demod
Baseband, IF2 in OOK
Figure 14: Receiver Architecture
3.4.1. Architecture
The SX1211 receiver employs a super-heterodyne architecture. Here, the first IF is 1/9 th of the RF frequency
(approximately 100MHz). The second down-conversion down-converts the I and Q signals to base band in the
case of the FSK receiver (Zero IF) and to a low-IF (IF2) for the OOK receiver.
Second
down-conversion
LO2
Rx
First
down-conversion
0
IF2=0
in FSK
IF1
≈ 100MHz
Image
frequency
LO1 Rx
Channel
Frequencyl
mode
Figure 15: FSK Receiver Setting
First
Second
down-conversion
down-conversion
IF2<0
in FSK
0
IF1
≈ 100MHz
LO2 Rx
Image
frequency
LO1 Rx
Channel
Frequency
mode
equal to fo
Figure 16: OOK Receiver Setting
After the second down-conversion stage, the received signal is channel-select filtered and amplified to a level
adequate for demodulation. Both FSK and OOK demodulation are available. Finally, an optional Bit Synchronizer
(BitSync) is provided, to be supply a synchronous clock and data stream to a companion uC in Continuous mode,
Rev 8 – February 2013
Page 23 of 92
www.semtech.com
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