QF2.5-U0290

The QF2.5-U0290 is designed as crystal fiflter.

It has three applications. The first one is 8 pol filter. The next one is i.f.- filter. The last one is it would be used in mobile and stationary transceivers. That are all the main applications.

Some limiting values have been concluded into several points as follow. The first one is about its center frequency which would be 2.5 MHz. The next one is about its insertion loss which would be less than 4.0dB. The next one is about its pass band at 6.0 dB which would be from 0.3 kHz to 3.04 kHz. The next one is about its ripple in pass band at fo + 0.59 to 2.375 kHz which would be less than 2.0 dB and at -10 to +55°C and fo from +0.55 to 2.5 kHz which would be less than 2.0 dB. The next one is about its stop band attenuation at fo - 0.4 kHz and fo + 7.5 kHz which would be larger than 40dB. The next one is about its alternate attenuation which would be larger than 60dB (except spurious ). The next one is about its input power which would be less than 10 mW. The next one is about its terminating impedance Z which means R1 || C1 would be 600 || 0 ohm/pF and R2 || C2 would be 600 || 0 ohm/pF. The next one is about its operating temperature range which would be from -25 to +70°C. That are all the main specifications above.

Also some introduction about its pin connection. The first one is about its pin 1 which would be input. The next one is about its pin 2 which would be ground input. The next one is about its pin 3 which would be output. The next one is about its pin 4 which would be ground-output. That are all the important specifications above. And so on. If you have any question or suggestion or want to know more information about it please contact us for details.