RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 1 of 3
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RF1181D-081704
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency at 25C
Absolute Frequency
f
c
1, 2, 3
916.5
MHz
Tolerance from 916.50 MHz
f
c
kHz
Insertion Loss
IL
1, 3
2.5
4.0
dB
3 dB Bandwidth
BW
3
1, 3
500
600
900
kHz
Rejection (Attenuation: relative to Min IL:) 10 to 895 MHz
1, 3
40
50
dB
895 to 906 MHz
30
35
906 to 910 MHz
25
30
922 to 925 MHz
35
40
925 to 933 MHz
14
18
933 to 940 MHz
30
35
940 to 1100 MHz
40
45
Temperature
Freq. Temp. Coefficient
FTC
3, 4
0.032
ppm/C
2
Frequency Aging
Absolute Value during the First Year
|fA|
5
10
ppm/yr
Impedance @ f
C
Input Z
IN
= R
IN
/C
IN
Z
IN
1
37
// 1.6pF
Output Z
OUT
= R
OUT
/C
OUT
Z
OUT
25
// 1.8pF
Lid Symbolization (in addition to Lot and/or Date Codes)
435 // YWWS
Standard Reel Quantity 7 Inch Reel
9
500 Pieces/Reel
Standard Reel Quantity 13 Inch Reel
3000 Pieces/Reel
Ideal Front-End Filter for 916.5 MHz Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Complies with Directive 2002/95/EC (RoHS)
The RF1181D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 916.5 MHz receivers. Receiver designs using this filter include superhet with
10.7 MHz IF, direct conversion and superregen. Typical applications of these receivers are wireless remote-
control and security, data telemetry, and meter reading devices operating in the USA under FCC Part 15 and
in Canada under DoC RSS-210.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater
than 40 dB, of the LO and image spurious responses of superhet receivers with 10.7 MHz IF. RFM's ad-
vanced SAW design and fabrication technology is utilized to achieve high performance and very low loss with
simple external impedance matching (not included). Our new patent pending solder seal process utilizes a
Faraday shield lid, which improves out of band rejection.
916.5 MHz
SAW Filter
RF1181D
SM3838-8 Case
3.8 x 3.8
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50
test system with VSWR
1.2:1. The
test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, f
c
. Note that insertion loss and bandwidth and passband shape are dependent on
the impedance matching component values and quality.
2.
The frequency f
c
is defined as the midpoint between the 3dB frequencies.
3.
Where noted specifications apply over the entire specified operating temperature range of -40 to 90C.
4.
The turnover temperature, T
O
, is the temperature of maximum (or turnover) frequency, f
o
. The nominal frequency at any case temperature, T
c
, may be calculated from:
f = f
o
[1 - FTC (T
o
- T
c
)
2
].
5.
Frequency aging is the change in fc with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. Typically,
aging is greatest the first year after manufacture, decreasing significantly in subsequent years.
6.
The design, manufacturing process, and specifications of this device are subject to change.
7.
One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending.
8.
All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
9.
Tape and Reel Standard for ANSI/EIA 481.
Pb
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