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SAW Filter
Ideal Front-End Filter for European Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Rugged TO39 Hermetic Package
The RF1172 is a low-loss, compact and economical surface-acoustic-wave (SAW)
filter designed to provide front-end selectivity in 447.725 MHz receivers. Recevier
designs using this filter include superhet with 10.7 MHz, direct conversion and
superregen. Typical applications of these FSK receivers are wireless remote-control
and security devices operating in Europe.
TO39-3 Case
This coupled-resonator filter (CRF) uses selective null placement to provide suppres-
sion, typically greater than 40 dB, of the LO and image spurious responses of super-
het receivers with 10.7 MHz IF. RFM鈥檚 advanced SAW design and fabrication technology is utilized to achieve high performance and
very low loss with simple external impedance matching (not included). Quartz construction provides excellent frequency stability over
a wide temperature range.
Electrical Characteristics
Characteristic
Nominal Frequency
Insertion Loss
3 dB Passband
3 dB Reject Band
Rejection
at f
C
- 21.4 MHz (Image)
at f
C
- 10.7 MHz (LO)
Ultimate
Temperature
Operating Case Temperature
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficent
Frequency Aging
External Impedance
Absolute Value during the First Year
Series Inductance
Shunt Capacitance
Lid Symbolization (in addition to Lot and/or Date Codes)
T
C
T
O
f
O
FTC
IfAI
L
C
1, 7
3, 7, 8
3
4
-40
15
25
f
C
0.032
10
22
5-18
RFM RF1306
Sym
f
C
IL
BW
3
BW
3
Notes
2, 4, 5, 6
3, 4, 7
2, 3, 4, 7
2, 3, 4, 7
40
15
50
30
80
+85
40
dB
擄C
擄C
MHz
ppm/擄C
2
ppm/yr
nH
pF
鹵80
Minimum
447.645
Typical
447.725
3.0
Maximum
447.805
5.5
Units
MHz
dB
kHz
kHz
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
1.
2.
3.
4.
Notes:
Typical test circuit is shown for for TO-39 RF filters.
Passband and reject bands are specified in reference to f
C
.
All characteristics are specified over the operating temperature range and typical aging for 10 years.
Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture. Note that insertion loss,
bandwidth, and passband shape are dependent on the impedance matching component values and quality. Demonstration circuits
are available for confirmation of device performance.
One or more of the following U.S. Patents apply: 4,454,488; 4,616,197; and other pending.
All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
The design, manufacturing process, and specifications of this device are subject to change without notice.
The turnover temperature, T
O
, is the temperature of maximum (or turnover) frequency, f
o
. The nominal frequency at any case tem-
perature, T
C
, outside the operating temperature range may be calculated from: f = f
o
[1 - FTC (T
O
- T
C
)
2
].
5.
6.
7.
8.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone 44 1963 251383
Fax: 44 1963 251606
漏1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RF1306-082799
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