SF2178A
• Precision IF SAW Filter
• Hermetic 13.3 x 6.5 mm Surface-mount Case
• Complies with Directive 2002/95/EC (RoHS)
Absolute Maximum Ratings
Rating
Maximum Incident Power in Passband
Maximum DC Voltage Between any 2 Terminals
Storage Temperature Range
Suitable for Lead-free Soldering - Maximum Soldering Profile
Pb
Value
+10
30
-40 to +85
260°C for 30 s
168 MHz
SAW Filter
Units
dBm
VDC
°C
SM13365-12
Electrical Characteristics
Characteristic
Center Frequency
1 dB Bandwidth
3 dB Bandwidth
Upper -35 dB Band Edge
Lower -35 dB Band Edge
Insertion Loss
Passband Ripple (p-p)
Absolute Group Delay
Group delay ripple (p-p)
Operating Temperature
Source Impedance
VSWR to Source (Matching Network)
Load Impedance
VSWR to Load (Matching Network)
Frequency Temperature Coefficient
Impedance Matching to 50
Ω
Unbalanced
Case Style
Lid Symbolization (YY = year, WW = week)
159.5 to 168.5 MHz
159.5 to 168.5 MHz
158 to 178 MHz
168 MHz
158 to 178 MHz
1
-40
50
2.3
50
2.2
-72
External L-C
SM13365-12 13.3 x 6.5 mm Nominal Footprint
RFM SF2178A YYWW
ppm/°C
ohm
1, 2, 3
IL
Sym
f
C
BW
1
BW
3
Notes
1
1
1
1
1
1
Min
20.0
Typ
168
20.9
22.4
181.7
Max
Units
MHz
MHz
MHz
182.0
13.5
1.0
1
160
+85
MHz
MHz
dB
dB
µs
ns
°C
ohm
154
155.1
12.2
0.76
0.85
54
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
©2008 by RF Monolithics, Inc.
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SF2178A - 7/7/09
RFM [ RF MONOLITHICS, INC ]
