参数资料
型号: MRF89XAT-I/MQ
厂商: Microchip Technology
文件页数: 96/140页
文件大小: 0K
描述: RF ISM BAND TXRX 32 QFN
标准包装: 1
频率: 863MHz ~ 870MHz,902MHz ~ 928MHz,950MHz ~ 960MHz
数据传输率 - 最大: 200kbps
调制或协议: FSK,OOK
应用: ISM
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
存储容量: *
天线连接器: PCB,表面贴装
工作温度: -40°C ~ 85°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 标准包装
其它名称: MRF89XAT-I/MQDKR
MRF89XA
4.4
POWER AMPLIFIER
4.4.1
OPTIMUM LOAD IMPEDANCE
The Power Amplifier (PA) integrated in the MRF89XA
operates under a regulated voltage supply of 1.8V. The
external RF choke inductor is biased by an internal reg-
ulator output made available on the PARS pin (pin 29).
These features help PA output power to be consistent
over the power supply range. This is important for
applications that allow predictable RF performance and
battery life.
As the PA and the LNA front-ends in the MRF89XA
share the same input/output pin, they are internally
matched to approximately 50 ? . Figure 4-4 illustrates
optimum load impedance of RFIO through an imped-
ance chart.
FIGURE 4-4:
OPTIMAL LOAD IMPEDANCE CHART
Pmax-1dB circle
Max Power
Zopt = 30 + j25 Ω
Note:
Refer to Section 4.7, Bill of Materials for
an optimized PA load setting.
DS70622C-page 96
Preliminary
? 2010–2011 Microchip Technology Inc.
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