®
SAW FILTERS FOR WIFI AND WIMAX APPLICATIONS
SAW filters for WiFi and
WiMax Applications
The IDT family of SAW filters features both high performance and low loss devices for an exact fit to
WiFi and WiMax application requirements.
Description
Worldwide Interoperability Microwave Access (WiMax) is an attempt by the telecommunications industry to
integrate Internet, wireless and wireline into one device. The goal is to integrate multiple access technologies
such as cellular, WiFi, and broadband while offering a consistent service experience across all environments.
IDT has developed a family of SAW devices suitable for IF filtering in WiMax applications. A wide range of
IF frequencies are offered to provide more flexibility to support customer requirements.
SAW Features:
• Wide range of common frequencies available
• Standard package footprints
• Insensitive to shock and vibration
• Low passband ripple
• Wide operating temperature range
• Good out-of-band rejection
• Small size
• Low cost
• LCC surface mount
• RoHS
Figure 1. Generic handheld RF transceiver block diagram
1
IDT® SAW FILTERS FOR WIFI AND WIMAX APPLICATIONS
Transmit
Mixer
Mixer
Receive IF
IF SAW
®
IF
IF SAW
®
Mixer
Mixer
Voice/Data
Out
Voice/Data
In
Driver
Amp
PA
LNA
Duplexer
Filter Demodulator
Modulator
Filter
IC
IF
Amp
IF
IF SAW
Parameter Min Typ Max Units
Center Frequency, Fc1– 44 – MHz
Minimum Insertion Loss2– 14 16 dB
Passband Ripple (Fc ± 1.25 MHz) – 0.6 1 dB p-p
Absolute Delay 1.7 – s
3 dB bandwidth2 3.4 3.8 – MHz
Relative Attenuation (Fc ± 1.85 MHz)21.9 2.5 – dB
Relative Attenuation (Fc ± 2 MHz)23 4.2 – dB
Relative Attenuation (Fc ± 3.5 MHz)238 42 – dB
Relative Attenuation (26.5 to 40.5 MHz)240 47 – dB
Relative Attenuation (47.5 to 61.5 MHz)238 41 – dB
Source and Load Impedance 50, 2k//3pF
Ambient Temperature – 25 – ˚C
1 Reference frequency. Computed as mean of the 3 dB frequencies.
2 All dB values are referenced to the insertion loss value.
Table 1. Typical WiMax SAW filter response
Typical part number www.IDT.com/go/SAWfilters
SF0374BA02518S 374 MHz 17 MHz BW LCC 5x5 mm
Table 2. WiFi system application part numbers
Typical part number www.IDT.com/go/SAWfilters
SF0044BA02640S 44 MHz 3.4 MHz BW LCC 13.3x6.5 mm
SF0044BA02641S 44 MHz 6.5 MHz BW LCC 13.3x6.5 mm
SF0048BA02644S 48 MHz 9 MHz BW LCC 13.3x6.5 mm
SF0048BA02645S 48 MHz 3.1 MHz BW LCC 13.3x6.5 mm
SF0325BA02633S 325 MHz 9 MHz BW LCC 7x5 mm
SF0325BA02646S 325 MHz 6.3 MHz BW LCC 7x5 mm
SF0325BA02642S 325 MHz 10 MHz BW LCC 7x5 mm
SF0464BA02647S 464 MHz 5.4 MHz BW LCC 7x5 mm
SF0465BA02509S 465 MHz 6 MHz BW LCC 3.8x3.8 mm
SF0480BA02643S 480 MHz 9 MHz BW LCC 7x5 mm
Table 3. WiMax system application part numbers
Parameter Min Max Units
Storage Temperature
Range
-40 85 ˚C
Operating Temperature
Range
-40 85 ˚C
Input Power Level – 10 dBm
-10.00
-30.00
-50.00
-70.00
-90.00
-110.00
-20.00
-40.00
-60.00
-80.00
-100.00
db
Center 44 MHz
Frequency
Span 30 MHz
-12.00
-13.00
-14.00
-15.00
-16.00
-17.00
-18.00
-19.00
-20.00
-21.00
-22.00
db
Frequency
Span 5MHzCenter 44 MHz
Figure 2. Typical WiMax SAW filter response Figure 3. Typical passband response
www.IDT.com/go/sawfilters
Contact and Technical Support : sawhelp@IDT.com
®
© 2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are registered trademarks of Integrated Device
Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners.
Printed in USA 9-08/MG/BWD/500
FLYR-SAW-WiFi-098
