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SAW FILTERS FOR AMR APPLICATION
SAW filters for AMR Application
The IDT family of SAW filters feature extremely low loss, high frequency selectivity and low cost,
all critical to successful AMR equipment design.
Description
Automated Meter Reading (AMR) is an emerging market worldwide. Using two way communications to
signal and extract usage data from remote locations, AMR systems require the use of SAW filters to eliminate
potential signal interference. Typical AMR applications are used to monitor usage of electricity, water and
gas. IDT has developed low insertion loss SAW filters that are ideally suited for providing signal integrity
and rejecting interference. Several popular frequencies are available including 915 MHz, 868 MHz and
433 MHz.
SAW Features:
• High reliability
• Insensitive to shock and vibration
• Low insertion loss or high performance
• Frequency stable over temperature
• Flat passband
• Uniform group delay
• Small size
• Low cost
• Standard surface mount
• RoHS
Figure 1. SAW AMR block diagram
1
IDT® SAW FILTERS FOR AMR APPLICATIONS
ANT
LNA
DSP/CPU
Current
Transducer
Voltage
Transducer
VCO
SAW Filter SAW Filter
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SAW Filter
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Parameter Min Typ Max Units
Center Frequency, Fc1– 915.3 – MHz
Insertion Loss at Fc – 1.3 2.5 dB
Lower 3 dB Band Edge2– – 904.4 MHz
Upper 3 dB Band Edge2 926.2 – – MHz
Group Delay Variation (904.4 to 926.2 MHz) – 40 80 ns
Amplitude Variation (904.4 to 926.2 MHz) 1.8 3 dB p-p
Attenuation at 894 MHz 20 25
Attenuation (200 to 888.3 MHz)235 – – dB
Attenuation (888.3 to 894 MHz)215 – – dB
Attenuation (942.3 to 1400 MHz)240 – – dB
Input/Output Return Loss At Fc – 13 – dB
Temperature Coefficient of Frequency – -36 – ppm/˚C
Source/Load Impedance 50 50 50 ohms
Ambient Temperature – 25 – ˚C
1 Defined as the average of the lower and upper 3 dB frequencies at room ambient.
2 All dB levels are defined relative to the insertion loss.
Table 1. Typical AMR SAW filter response
Typical part number www.IDT.com/go/SAWfilters
SF0433BA02629S 433 MHz 20 MHz BW 3.8x3.8 mm
SF0434BA02507S 434 MHz 4 MHz BW 3.8x3.8 mm
SF0434BA02587S 434 MHz 7 MHz BW 3.8x3.8 mm
SF0434BA02617S 434 MHz 2 MHz BW 3.0x3.0 mm
SF0869BA02503S 869 MHz 2 MHz BW 3.8x3.8 mm
SF0869BA02504S 869 MHz 3 MHz BW 3.0x3.0 mm
SF0869BA02588S 869 MHz 2 MHz BW 3.0x3.0 mm
SF0869BA02618S 869 MHz 20 MHz BW 3.0x3.0 mm
SF0915BA03171S 915 MHz 21.8 MHz BW 3.8x3.8 mm
SF0915BA02531S 915 MHz 26 MHz BW 2.5x2.0 mm
SF0915BA02620S 914.5 MHz 8 MHz BW 3.8x3.8 mm
Table 2. AMR system application part numbers
Parameter Min Max Units
Storage Temperature
Range
-40 85 ˚C
Operating Temperature
Range
-20 75 ˚C
Input Power Level – +15 dBm
Figure 2. Typical AMR SAW filter response Figure 3. Typical wideband response
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© 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/v4_FF
FLYR-SAW-AMR-098
www.IDT.com/go/sawfilters
Contact and Technical Support: sawhelp@IDT.com
