产品名称：TTE 滤波器 LB7  
型号：LB7   
描述：
SERIES NUMBER: LB7
NUMBER OF POLES:7
INSERTION LOSS at 0.1 x f -3dBc dB MAXIMUM:0.5
STOPBAND
       ATTENUATION dBc MINIMUM:-60 
       FREQUENCY:2.8 x f 
-3dBc

NOTES:
? Operating Temperature Range: 
 0°C to +70°C 
? Number of Poles: 3 to 11
? VSWR: 1.5:1 Typical
? Input Power: 20 mW
? Case Type: Refer to Case Selection Guide
? Case Option: PCB
? Normalized : Refer to Graphs
? Product Info: Refer to LB Series 
TERMINATION: 
50 Ω 100 MHz - 2 GHz
50 Ω or 75 Ω 300 kHz - 100 MHz
1 kΩ - 50 Ω 10 kHz - 300 kHz
10 kΩ - 1 kΩ 100 Hz - 10 kHz

STOPBAND FREQUENCY CALCULATION:
Using part number LB7-125M-50-3A, we know that 
the filter is a 7 pole Butterworth lowpass filter. 
Scroll down series number LB7. Moving to the 
right we find the stopband specification listed as 
-60dBc minimum at 2.8 x f -3dBc. Thus, the -60dBc 
frequency is at 350 MHz (2.8 x 125 MHz).