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RF2368PCBA 参数 Datasheet PDF下载

RF2368PCBA图片预览
型号: RF2368PCBA
PDF下载: 下载PDF文件 查看货源
内容描述: DCS / PCS 2.7V低噪声放大器 [DCS/PCS 2.7V LOW NOISE AMPLIFIER]
分类和应用: 放大器过程控制系统分布式控制系统PCSDCS
文件页数/大小: 8 页 / 194 K
品牌: RFMD [ RF MICRO DEVICES ]
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Preliminary  
RF2368  
Application Notes  
Bypass Mode Configurations  
The RF2368 may be placed into either high gain or bypass mode via the GAIN SELECT pin (pin 8). The high gain state  
is selected by asserting the GAIN SELECT pin to a voltage level of less than 0.8V. For Bypass operation, there are two  
possible methods for placing the RF2368 into this low gain state. The table below shows the two possible Bypass config-  
urations.  
Bypass Mode Possibilities  
Gain Select  
BIAS (V)  
VCC1 and VCC2 (V)  
Current (mA)  
2.7  
2.7  
0
2.7  
2.78  
2.78  
1.4  
2.2  
4
For both Bypass configurations, the GAIN SELECT pin must be placed at a level greater than or equal to 1.8V. The dif-  
ference between the Bypass possibilities is determined by the specific application's ability to change the voltage of the  
BIAS pin (pin 1) independently of the VCC supply voltage. The advantage of the ability to assert the power down pin to  
0V when in Bypass mode is shown by the decreased current draw when in this Bypass configuration.  
BIAS Pin Resistor  
The BIAS pin (pin1) of the RF2368 should be maintained at 2.7V to 2.86V for proper high gain operation. This voltage  
range ensures the correct bias current will be present at the BIAS pin of the device. However, an external series resistor  
may be used to allow various operating voltages at this pin (see R1 of the evaluation board schematic). The required  
value for this resistor may be roughly calculated by using the operating input voltage to the BIAS pin, the desired voltage  
at the device, and the typical current consumption for the BIAS pin, along with Ohm's law.  
For example, assume the design will supply 5.0V to the BIAS pin of the device, but the biasing circuitry internal to the  
RF2368 requires 2.78V typical, and the BIAS current is known to typically be 0.25mA, then the required value for R1  
would be found as follows.  
5.0V – 2.78V  
-------------------------------  
= 8.88k  
0.25mA  
4-202  
Rev A0 010503