SF2181D Datasheet, PDF (1/11 Pages) RF Monolithics, Inc – 140 MHz SAW Filter

• 22 MHz Filter Bandwidth
• 3.8 x 3.8 x 1.4 mm Surface-mount Package
• Complies with Directive 2002/95/EC (RoHS)
Absolute Maximum Ratings
Rating
Maximum Incident Power in Passband
Maximum DC Voltage between any Two Terminals
Storage Temperature Range in Tape and Reel
Suitable for Lead-free Soldering - Maximum Soldering Profile
Pb
Value
Units
+10
dBm
3
VDC
-40 to +85
°C
260°C for 30 s
SF2181D
140 MHz
SAW Filter
Electrical Characteristics
Characteristic
Nominal Center Frequency
Insertion Loss
Insertion Loss Variation over Temperature
3 dB Bandwidth
Passband Amplitude Ripple, Matching Network A, 129 to 151 MHz
Passband Amplitude Ripple, Matching Network B, 129 to 151 MHz
Passband Amplitude Ripple, Matching Network C or D, 130 to 150 MHz
Absolute Attenuation (referenced to IL_MAX)
10 to 116 MHz
165 to 700 MHz
Absolute Group Delay in Passband
Passband Group Delay Ripple, Matching Network A or B, 129 to 151 MHz
Input Impedance, Unbalanced Matching Network
Input Impedance, Balanced Matching Network
Input Return Loss through any Matching Network
Output Impedance, Unbalanced Matching Network
Output Impedance, Balanced Matching Network
Output Return Loss through any Matching Network
Operating Temperature Range
Case Style
Lid Symbolization (Y=year, WW=week, S=shift)
Sym
F_C
IL_MAX
SM3838-8
Notes
Min
Typ
Max
Units
1
140
MHz
1
8
9
dB
1
1
dB
1
22
27
MHz
1
0.8
1.2
dB_P-P
1
0.6
1.0
dB_P-P
0.9
1.0
dB_P-P
3
35
40
dB
3
35
40
dB
1
300
350
ns
1
40
80
ns_P-P
1
50
ohm
1
200
ohm
1
6
14
dB
1
50
ohm
1
200
ohm
1
6
14
dB
-40
+85
°C
SM3838-8 3.8 x 3.8 mm Nominal Footprint
RFM 872 YWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Unless noted otherwise, all specifications apply over the operating temper-
ature range with filter soldered to the specified demonstration board with
impedance matching to 50 Ω and measured with 50 Ω network analyzer.
2. Unless noted otherwise, all frequency specifications are referenced to the
nominal center frequency, fc.
3. Rejection in final user application is dependent on PCB layout and
external impedance matching design. See Application Note No. 42 for
details.
4. "LRIP" or "L" after the part number indicates "low rate initial production"
and "ENG" or "E" indicates "engineering prototypes."
5. The design, manufacturing process, and specifications of this filter are
subject to change.
6. 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.
7. US and international patents may apply.
8. RFM, stylized RFM logo, and RF Monolithics, Inc. are registered
trademarks of RF Monolithics, Inc.
www.RFM.com E-mail: [e-mail]
©2009-2010 by RF Monolithics, Inc.
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SF2181D - 2/16/10