®
RF1181D
•
•
•
•
Ideal Front-End Filter for 916.5 MHz Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
916.5 MHz
SAW Filter
Complies with Directive 2002/95/EC (RoHS)
Pb
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.
SM3838-8 Case
3.8 x 3.8
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
f
Center Frequency at 25°C
Absolute Frequency
916.5
MHz
c
1, 2, 3
Df
Tolerance from 916.50 MHz
kHz
dB
c
Insertion Loss
IL
1, 3
1, 3
2.5
4.0
BW
3 dB Bandwidth
500
40
30
25
35
14
30
40
600
50
35
30
40
18
35
45
900
kHz
3
Rejection (Attenuation: relative to Min IL:)
10 to 895 MHz
895 to 906 MHz
906 to 910 MHz
922 to 925 MHz
925 to 933 MHz
933 to 940 MHz
940 to 1100 MHz
1, 3
dB
2
3, 4
5
Temperature
Freq. Temp. Coefficient
FTC
|fA|
0.032
ppm/°C
Frequency Aging
Absolute Value during the First Year
Input Z = R /C
£10
ppm/yr
Z
37W // 1.6pF
25W // 1.8pF
435 // YWWS
IN
IN IN
IN
1
Impedance @ f
Output Z
= R
/C
Z
C
OUT
OUT OUT
OUT
Lid Symbolization (in addition to Lot and/or Date Codes)
Standard Reel Quantity
Standard Reel Quantity
7 Inch Reel
500 Pieces/Reel
3000 Pieces/Reel
9
13 Inch Reel
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 W test system with VSWR £ 1.2:1. The
test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, fc. Note that insertion loss and bandwidth and passband shape are dependent on
the impedance matching component values and quality.
2.
The frequency fc is defined as the midpoint between the 3dB frequencies.
3.
4.
Where noted specifications apply over the entire specified operating temperature range of -40 to 90°C.
The turnover temperature, TO, is the temperature of maximum (or turnover) frequency, fo. The nominal frequency at any case temperature, Tc, may be calculated from:
f = fo [1 - FTC (To - Tc)2].
5.
Frequency aging is the change in fc with time and is specified at +65°C or less. Aging may exceed the specification for prolonged temperatures above +65°C. Typically,
aging is greatest the first year after manufacture, decreasing significantly in subsequent years.
The design, manufacturing process, and specifications of this device are subject to change.
One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending.
All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
Tape and Reel Standard for ANSI/EIA 481.
6.
7.
8.
9.
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-8148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RF1181D-081704
Page 1 of 3
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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