®
RF1211C
315.0 MHz
SAW Filter
•
•
•
•
Ideal Front-End Filter for Domestic Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Complies with Directive 2002/95/EC (RoHS)
Pb
The RF1211C is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 315.0 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 wire-
less remote-control and security devices (especially for automotive keyless entry) operating in the USA
under FCC Part 15, in Canada under RSS-210, and in Italy
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.
Electrical Characteristics
Item
Center Frequency @ 25°C
Pass band (relative to IL
min
)
314.77~315.2 MHz
314.71~315.26 MHz
Pass bandwidth (relative to IL
min
)
Attenuation: (relative to IL
min
)
10~270
270~309
309~313.94
316~335
335~400
400~1000
MHz
MHz
MHz
MHz
MHz
MHz
Output
Turnover To
Frequency Aging
Standard Reel Quantity
(dB)
(dB)
BW
3
(KHz)
(dB)
(dB)
(dB)
(dB)
(dB)
(dB)
(dB)
Z
IN
=R
IN
//C
IN
Z
OUT
=R
OUT
//C
OUT
(deg.C)
Absolute Value During the First Year
Reel Size 7 Inch
Reel Size 13 Inch
45
30
15
10
35
45
55
35
20
15
42
60
344Ω // 4.9 pF
344Ω // 4.9 pF
25 typ.
-
-
800
1.5
2.0
900
F
C
(MHz)
(dB)
IL
min
Minimum
-
-
Typical
315
1.8
SM5050-8 Case
5x5
Maximum
-
5.0
3.0
6.0
-
-
-
-
-
-
-
1
3, 4
1
1
Note
1, 2
1
1
Minimum
I.L.
(314.82~315.22 MHz)
Impedance at F
C
; Input
≤10
ppm/yr Typical
410 YWWS
500 Pieces/Reel
3000 Pieces/Reel
Lid Symbolization (in addition to Lot and/or Date Codes)
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
Ω
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 band-
width 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.
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
5.
6.
7.
8.
be calculated from: f = f
o
[1 - FTC (T
o
- T
c
)
2
].
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 without notice.
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.
E-mail: info@rfm.com
http://www.rfm.com
RF1211C-090503
Page 1 of 3
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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