SAW Device WF748D0140CD For Fixed Communication ■ Features ● IF SAW filter for base station. ● A low-loss filter. ● Compact. (7.0×5.0mm) ● Excellent guaranteed attenuation. ■ Specifications Model WF748D0140CD Item Nominal frequency : f0 (MHz) Insertion loss at f0 Passband width (rel to f0) Out Band (rel to f0) min. typ. max. – 140 – 11 – – 1-dB passband width (MHz) 21 – – 3-dB passband width (MHz) 23.9 – – 35-dB passband width (In Band)(MHz) – – 34 Pass-band ripple (@ f0 ±10 MHz)(ns) – – 1.0 Phase linearity (@ f0 ±10 MHz)(deg) – – 14 Group delay distortion (@ f0 ±10 MHz)(ns) – – 100 Absolute delay time @ f0 (μs) – 0.76 – Guaranteed attenuation (dB)@ f0–20 MHz 40 – – 33 – – @ f0+20 MHz Operating temperature range (°C) +23 to +27 Terminating impedance (Ω) 50 (with matching) ■ Dimensions ■ Characteristics [In-band characteristics] mm CH1 A/R LOG MAG REF –9.290 dB 1.000 dB/ 5.0±0.2 Terminal land connections Others 10 5 GND INPUT OUTPUT 1.6±0.2 7.0±0.2 4 9 5 8 7 1.27 6 2.54 CH1 2.54 5.0 10 0.8 2.5 1.5 2 Land pattern (Typical) CENTER(MHz) 140.0000 SPAN(MHz) 50.000 [Out-of-band characteristics] CH1 A/R LOG MAG REF –9.290 dB 10.000 dB/ 1.4 1 2.54 9–1.0±0.13 3 1.9 10–0.6±0.1 1.5±0.15 2.54 7.0 ■ Matching Circuit IN C1 10 C2 5 OUT SAW 50Ω L1 L2 50Ω CH1 - 21 - CENTER(MHz) 140.0000 SPAN(MHz) 100.000 12A_0903_WF748D0140CD_e