®
RF1210D
303.825 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 RF1210D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 303.825 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.
SM3838-8 Case
3.8 x 3.8
Electrical Characteristics
Characteristic
Center Frequency @ 25°C
Passband (relative to IL
min
)
Pass Bandwidth (relative to IL
min
)
Attenuatioin: (relative to IL
min
)
10~260 MHz
260~297 MHz
297~302.5 MHz
304.8~320 MHz
320~400 MHz
400~1000 MHz
Frequency Temperature Coefficient
Frequency Aging
Impedance @ F
C
Absolute Value during the First Year
Input Z
IN
=R
IN
llC
IN
Output Z
OUT
=R
OUT
llC
OUT
Lid Symbolization (Y=year WW=week D=day of week)
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
FTC
|fA|
Z
IN
Z
OUT
1
1
Absolute Frequency
303.595 - 304.025
303.535 - 304.085
BW
3
Sym
f
c
IL
min
Notes
1, 2, 3
1, 3
1
1, 3
500
45
35
11.5
14
37
45
Minimum
Typical
303.825
1.6
1.0
1.5
650
50
40
15
18
40
50
0.032
≤10
22.6Ω ll 2.6pf
21.5Ω ll 3.1pf
488 // YWWS
500 Pieces/Reel
3000 Pieces/Reel
ppm/°C
2
ppm/yr
dB
2.5
3.0
6.0
800
Maximum
Units
MHz
dB
dB
kHz
Minimum I.L. (303.620~303.980 MHz)
9
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
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 bandwidth 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 of -40°C to +90°C.
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 be calculated from:
f = f
o
[1 - FTC (T
o
- T
c
)
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.
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.
9. Tape and Reel Standard Per ANSI/EIA 481.
10. This product complies with directive 2002/95/EC of the European Parlament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous sub-
stances in electrical and electronic equipment.
1.
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.
E-mail: info@rfm.com
http://www.rfm.com
RF1210D-083105
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RFM [ RF MONOLITHICS, INC ]
