鈥?/div>
SAW Filter
Ideal Front-End Filter for European Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Surface-Mount Ceramic Case with 52 mm
2
Footprint
The RF1339B is a low-loss, compact, and economical surface-acoustic-wave (SAW) fil-
ter designed to provide front-end selectivity in 449.1 MHz receivers. Receiver designs
using this filter include superhet with 10.7 MHz or 500 kHz IF, direct conversion and
superregen. Typical applications of these receivers are wireless remote-control and secu-
rity devices operating in Europe under ETSI I-ETS 300 220, in Germany under FTZ17
TR 2100, in the United Kingdom under DTI MPT 1340 (for automotive only), in France
under PTT Specification ST/PAA/TPA/AGH/1542, and in Scandinavia.
SM8558-8 Case
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). Our new patent pending solder
seal process utilizes a Faraday shield lid, which improves out of band rejection.
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)
Temperature
Ultimate
Operating Case Temp.
Turnover Temperature
Turnover Frequency
Freq. Temp. Coefficent
Absolute Value during the
First Year
External Impedance
Series Inductance
Shunt Capacitance
Lid Symbolization (in addition to Lot and/or Date Codes)
Frequency Aging
T
C
T
O
f
O
FTC
|fA|
L
C
3
1, 7
3, 7, 8
4
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
-40
10
25
f
c
0.032
鈮?0
47
12
RFM 272
50
30
80
+85
40
擄C
擄C
MHz
ppm/擄C
2
ppm/yr
nH
pF
dB
鹵85
鹵570
Minimum
Typical
449.1
3.0
5.0
Maximum
Units
MHz
dB
kHz
kHz
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes
1.
2.
3.
4.
Typical demonstration circuit shown is for SM8558-8 solder seal filters.
Passband and reject bands are specified in reference to f
c
.
All characteristics are specified over the operating temperature range and typical aging is 10 years.
Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture. Note that insertions 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 others 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, TO, is the temperature of maximum (or turnover) frequency, f
o
. The nominal frequency at any case temperature, T
c
, out-
side the operating temperature range may be calculated from: f = f
o
[1 - FTC (T
o
- T
c
)
2
].
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe Sales
Phone: (33-0) (1) 39.16.42.89
Fax: (33-0) (1) 39.16.42.70
漏1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RF1339B-A-042699
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