产品名称：TTE滤波器LB9  
型号：LB9   
描述：
SERIES NUMBER:LB9
NUMBER OF POLES:9
INSERTION LOSS at 0.1 x f -3dBc dB MAXIMUM:0.5
STOPBAND
       ATTENUATION dBc MINIMUM:-60 
       FREQUENCY:2.3 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 Options: PCB, SMT, BNC or SMA
? Normalized Response: Refer to Graphs
? Product Info: Refer to LB Series 
TERMINATIONS: 
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 CALCULATIONS:
Using part number LB7-125M-50-3A, we know that 
the filter is a 7 pole Butterworth lowpass filter. 
Scroll down to 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).

PART NUMBER DERIVATION: 
LB7 *(R) -125M -50 -3A 
1 2 3 4 5 6 
1) Series, LB 
2) Number of poles, 7
3) “R” RoHS compliant. Allow for longer lead time.
4) f-3dBc
5) Terminations
6) Case selection from the case selection guide.