SF2157A
•
•
•
•
Designed for WiMax Applications
Low Insertion Loss IF Filter
Hermetic 13.3 x 6.5 mm Surface-mount Case
Complies with Directive 2002/95/EC (RoHS)
Pb
Value
+10
30
-50 to +125
156 MHz
SAW Filter
Units
dBm
VDC
°C
Absolute Maximum Ratings
Rating
Maximum Incident Power in Passband
Maximum DC Voltage Between any Two Terminals
Storage Temperature Range
Suitable for Lead-free Soldering - Maximum Soldering Profile
260 °C for 30 s
SM13365-12
Electrical Characteristics
Characteristic
Center Frequency
1 dB Bandwidth
3 dB Bandwidth
40 dB Bandwidth
Insertion Loss
Attenuation Relative to IL
0 to123 MHz
190 to 1000 MHz
Passband Ripple, 146 to 166 MHz
Absolute Group Delay, 156 MHz
Group Delay Ripple, 146 to 166 MHz
Operating Temperature Range
Source Impedance
VSWR to Source through Matching Network
Load Impedance
VSWR to Load through Matching Network
Frequency Temperature Coefficient
Impedance Matching to 50
Ω
Unbalanced
Case Style
Lid Symbolization (YY = year, WW = week)
1
-40
50
1.4:1
50
1.4:1
-94
External L-C
SM13365-12 13.3 x 6.5 mm Nominal Footprint
RFM SF2157A YYWW
2:1
ppm/K
2:1
ohm
1, 2, 3
1, 2, 3
45
45
50
50
1.0
1.13
30
1.8
1.50
100
+85
dB
P-P
µs
ns
P-P
°C
ohm
dB
Sym
f
C
BW
1
BW
3
BW
40
IL
Notes
1
1
1
1
1
Min
20.0
21.0
Typ
156
22.0
24.0
27
10.0
Max
Units
MHz
MHz
MHz
30
12.0
MHz
dB
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
Unless noted otherwise, all specifications apply over the operating temperature range with filter soldered to the specified demonstration board with impedance
matching to 50
Ω
and measured with 50
Ω
network analyzer.
Unless noted otherwise, all frequency specifications are referenced to the nominal center frequency, fc.
Rejection is measured as attenuation below the minimum IL point in the passband. Rejection in final user application is dependent on PCB layout and external
impedance matching design. See Application Note No. 42 for details.
Part to part absolute delay measurement records the absolute delay mean across 1 dB passband.
"LRIP" or "L" after the part number indicates "low rate initial production" and "ENG" or "E" indicates "engineering prototypes.”
The design, manufacturing process, and specifications of this filter are subject to change.
Either Port 1 or Port 2 may be used for either input or output in the design. However, impedances and impedance matching may vary between Port 1 and Port
2, so that the filter must always be installed in one direction per the circuit design.
US and international patents may apply.
www.RFM.com E-mail: info@rfm.com
©2009 by RF Monolithics, Inc.
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SF2157A - 7/10/09
RFM [ RF MONOLITHICS, INC ]
