收藏本站
MRF89XA
3.4.10.1
Optimizing the Floor Threshold
The setting of the FTOVAL<7:0> bits are application-
The FTOVAL<7:0> bits (FLTHREG<7:0>) determine
the sensitivity of the OOK receiver, as it sets the com-
parison threshold for weak input signals (that is, those
close to the noise floor). Significant sensitivity
improvements can be generated if configured correctly.
The noise floor of the receiver at the demodulator input
depends on the following conditions:
? 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
dependant. The procedure shown in the flow chart in
Figure 3-12 is recommended to optimize the
FTOVAL<7:0> bits.
The new floor threshold value found during this test
should be the value used for OOK reception with those
receiver settings.
Note that if the output signal on DATA is a logic ‘ 1 ’, the
value due to the FTOVAL<7:0> bits is below the noise
floor of the receiver chain. Conversely, if the output sig-
nal on DATA is a logic ‘ 1 ’, the value due to the
FTOVAL<7:0> bits is several dB above the noise floor.
FIGURE 3-12:
FLOOR THRESHOLD OPTIMIZATION
Set MRF89XA in OOK RX mode
Adjust Bit Rate, Channel filter BW
Default OOKTHSV<2:0> setting
No input signal
Continuous mode
Monitor DATA pin (pin 20)
Increment
FTOVAL<7:0>
Yes
Glitch activity
on DATA ?
No
Optimization complete
? 2010–2011 Microchip Technology Inc.
Preliminary
DS70622C-page 67
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MRF89XAM9A-I/RM IC TXRX MOD 915MHZ ULP SUB-GHZ
MRX-001-433DR-B MODULE RECEIVER 433MHZ 18DIP
MRX-002-433DR-B MODULE RECEIVER 433MHZ 18DIP
MRX-002SL-433DR-B MODULE RCVR 433MHZ SAW LN 24DIP
MRX-005-915DR-B MODULE RECEIVER 915MHZ 18DIP
MRX-005SL-915DR-B MODULE RCVR 915MHZ SAW LN 24DIP
MRX-007-433DR-B MODULE RECEIVER 433MHZ 18DIP
MRX-008-433DR-B MODULE RECEIVER 433MHZ 18DIP
相关代理商/技术参数
MRF89XAM8A-I 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Ultra Low-Power, Integrated ISM Band Sub-GHz Transceiver
MRF89XAM8A-I/RM 功能描述:射频模块 868MHz Sub-GHz transceiver module RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
MRF89XAM8A-I/RM 制造商:Microchip Technology Inc 功能描述:, Leaded Process Compatible:Yes, Peak Re
MRF89XAM9A_12 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:915 MHz Ultra Low-Power Sub-GHz Transceiver Module
MRF89XAM9A-I/RM 功能描述:射频模块 915MHz Sub-GHz Transceiver Mod RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
MRF89XAM9AT-I/RM 制造商:Microchip Technology Inc 功能描述:915 MHz Ultra Low-Power Sub-GHz Transceiver Module
MRF89XAT-I/MQ 功能描述:射频收发器 868/915/950 MHz Sub-GHz transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MRF8HP21080HR3 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 160W NI780H-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray