DS4025

DW9268 DW9268 240.192MHz IF SAW Filter Advance Information DS4025 - 1.4 October 1995 The DW9268 has been designed specifically for the Digital Cordless Personal Communications market as an IF filter with a centre frequency of 240.192MHz. The filter utilises GPS's low loss (7dB typical), Transversal filter technology based on a Quartz substrate for excellent temperature stability. A 3dB passband of 1.3MHz (typical) is maintained whilst providing rejection to adjacent and alternate interferers compliant to the DECT Common Interface specification Part 2 - The Physical Layer. The device also exhibits excellent closein and ultimate rejection, which combined with a Group Delay Ripple of 200ns maximum makes the DW9268 and ideal IF filter for Digital Cordless Personal Communications systems. The device is packaged in a surface mount, leadless ceramic chip carrier, suited to high volume automated assembly systems. FEATURES s 240.192MHz Centre Frequency (fo) s Low Insertion Loss (8dB maximum) s 3dB Passband 1.3MHz (typical) s Quartz Temperature Stability s Low Profile Ceramic LCC Package ABSOLUTE MAXIMUM RATINGS DC Voltage Input Power Max. VDC PIN 0V 10dBm NOMINAL IMPEDANCE Input: Output: 500Ω // 16pF 625Ω // 14pF 50Ω TEST BOARD COMPONENTS Input: Output: Shunt Cap. 45pF, Series Ind. 47nH Series Ind. 47nH, Shunt Cap. 34pF Components: Coilcraft 1008CS Inductors : Murata 0805 Capacitors ORDERING INFORMATION DW9268 1 DW9268 ELECTRICAL CHARACTERISTICS @ 25°C Parameter Centre Frequ...