®
RF1181B
•
•
•
Ideal Front-End Filter for 916.5 MHz Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Surface-Mount Ceramic Case with 52 mm2 Footprint
Complies with Directive 2002/95/EC (RoHS)
916.5 MHz
SAW Filter
•
•
The RF1181B 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.
SM8558-8 Case
Electrical Characteristics
Characteristic
Absolute Frequency
Tolerance from 916.50 MHz
Sym
Notes
Minimum
Typical
Maximum
916.600
±100
Units
Center Frequency at 25°C
f
916.400
916.5
MHz
kHz
dB
c
1, 2
Df
c
Insertion Loss
IL
1
4.0
5.0
3 dB Bandwidth
BW
1, 2
kHz
500
33
600
40
800
3
Rejection
at f - 21.4 MHz (Image)
c
at f - 10.7 MHz (LO)
1
15
37
dB
c
80
Ultimate
Temperature
Operating Case Temp.
T
-40
15
+85
40
°C
°C
C
Turnover Temperature
Turnover Frequency
Freq. Temp. Coefficient
T
25
O
3, 4
f
f
MHz
O
c
2
FTC
0.032
ppm/°C
Frequency Aging
Absolute Value during the First Year
Series Inductance
|fA|
L
5
1
£10
11 to 15
ppm/yr
nH
External Impedance
Shunt Capacitance
C
2.5 to 10
pF
Lid Symbolization (in addition to Lot and/or Date Codes)
RFM RF1181B
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, f . Note that insertion loss and band-
c
width are dependent on the impedance matching component values and quality.
2. The frequency f is defined as the midpoint between the 3dB frequencies.
c
3. Unless noted otherwise, specifications apply over the entire specified operating temperature range.
4. The turnover temperature, T , is the temperature of maximum (or turnover) frequency, f . The nominal frequency at any case temperature, T , may
O
o
c
2
be calculated from: f = f [1 - FTC (T - T ) ].
o
o
c
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.
6. The design, manufacturing process, and specifications of this device are subject to change without notice.
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.
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
RF1181B-092001
Page 1 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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