DW9268

1

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 close-

in 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

VDC

0V

Input Power Max.

PIN

10dBm

NOMINAL IMPEDANCE

Input:

500

Ω // 16pF

Output:

625

Ω // 14pF

50

Ω TEST BOARD COMPONENTS

Input:

Shunt Cap. 45pF, Series Ind. 47nH

Output:

Series Ind. 47nH, Shunt Cap. 34pF

Components: Coilcraft 1008CS Inductors : Murata 0805 Capacitors

ORDERING INFORMATION

DW9268

DS4025 - 1.4 October 1995

DW9268

240.192MHz IF SAW Filter

Advance Information