Crystal Filter 45-90 MHz-Series MCF Type: with a Built-in Transformer n Features Because this MCF has a built-in transformer, it is possible to match an input/output circuit with various impedance values. l Stable temperature characteristics. l This product can be manufactured according to your requested terminating impedance value. l Because it has already been completely adjusted, no adjustment is needed before use. l It can be manufactured with a wide frequency band. Caution • Because it has a non-enclosed structure, it cannot be washed. n Specifications Model 45NE7.5BB 45NE15BC 70NE7.5B Number of poles 70NE15B 90NE7.5BB 90NE15BC 4 Nominal frequency 45 MHz 3 dB Passband width Stop bandwidth 70 MHz 90 MHz ±3.75 kHz ±7.5 kHz ±3.75 kHz ±7.5 kHz ±3.75 kHz ±7.5 kHz Max. ±12.5 kHz at 25 dB Max. ±25 kHz at 30 dB Max. ±12.5 kHz at 25 dB Max. ±25 kHz at 30 dB Max. ±12.5 kHz at 25 dB Max. ±25 kHz at 30 dB Min. 30 dB Within ±1 MHz Min. 20 dB Within ±1 MHz 90NE7.5BB-90MFN15-844 90NE15BC-90MFN15-845 Ripple Max. 2 dB Insertion loss (insertion attenuation) Max. 6 dB Guaranteed attenuation MIn. 70 dB at ±910 kHz Spurious characteristics Min. 30 dB Within ±1 MHz Min. 20 dB Within ±1 MHz Min. 30 dB Within ±1 MHz Terminating impedance Min. 20 dB Within ±1 MHz 50 Ω // 0 pF –20 to +70 ℃ Operating temperature range D-168 Package type 45NE7.5BB-45MFN15-840 Ordering code 45NE15BC-45MFN15-841 n Dimensions 70NE7.5B-70MFN15-842 70NE15B-70MFN15-843 n Characteristics D-168 mm 10.5max ATT.(dB) 10 20 30 (A) 40 50 60 4±1 70 80 4min 1.5±0.5 (A) (B) –25 –1.0 –20 –0.8 –15 –0.6 –10 –0.4 –5 –0.2 (B) 5 0.2 0 10 0.4 15 0.6 20 0.8 25 (kHz) 1.0 (MHz) IN OUT 11.6±0.5 10 20 30 10.5max 4.6 3.5 GND ATT.(dB) 4–φ0.8max (A) 40 50 60 GND 70 18.5max (B) 80 90 (A) (B) –50 –1.0 –40 –0.8 –30 –0.6 –20 –0.4 –10 –0.2 0 10 0.2 20 0.4 30 0.6 40 0.8 50 (kHz) 1.0 (MHz) cf20_080926_45-90MCF_e