DW9249

1

DS3811 - 3.4 October 11995

DW9249

112.32MHz SAW IF Filter

Preliminary Information

The DW9249 112.32MHz SAW I.F. filter has been

specifically developed for the Digital European Cordless

Telephone (DECT) market.

By using a centre frequency of 112.32MHz, the DW9249

overcomes the potential problems of 6th and 8th harmonic

interference often associated with filters centred at

110.592MHz.

The filter offers excellent temperature stability, (ST-Quartz

substrate) plus low Group Delay Ripple (±100ns max.) and is

available in the latest, low profile ceramic surface mount

package technology.

FEATURES

s Extremely Low Group Delay Ripple

s Wide Operating Temperature

s High Co-channel rejection

s High Adjacent Channel Rejection

s Highly Reproduceable Impedance Characteristics

s Balanced or Unbalanced Drive

s Low Profile Leadless Ceramic Surface Mount Package

Suitable for Automated Assembly

ABSOLUTE MAXIMUM RATINGS

DC Voltage

VDC

0V

Input Power Max.

PIN

10dBm

NOMINAL IMPEDANCE

Input:

1.1k

Ω // 9.25pF

Output:

1.2k

Ω // 12pF

50

Ω TEST BOARD COMPONENTS

Input:

Series Ind. 180nH, Shunt Cap. 60.7pF

Output:

Series Ind. 100nH

Components: Coilcraft 1008CS Inductors : Murata 0805 Capacitors

ORDERING INFORMATION

DW9249

REFERENCE APPLICATION NOTE:

DW9249 - SAW Bandpass Filter for D.E.C.T.