RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 1 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RF1210D-083105
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)
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.
303.825 MHz
SAW Filter
RF1210D
SM3838-8 Case
3.8 x 3.8
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
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 -40C to +90C.
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 +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. 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.
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency @ 25C
Absolute Frequency
f
c
1, 2, 3
303.825
MHz
Minimum I.L. (303.620~303.980 MHz)
IL
min
1, 3
1.6
2.5
dB
Passband (relative to IL
min
)
303.595 - 304.025
1
1.0
3.0
dB
303.535 - 304.085
1.5
6.0
Pass Bandwidth (relative to IL
min
)
BW
3
1, 3
500
650
800
kHz
Attenuatioin: (relative to IL
min
)
10~260 MHz
1
45
50
dB
260~297 MHz
35
40
297~302.5 MHz
11.5
15
304.8~320 MHz
14
18
320~400 MHz
37
40
400~1000 MHz
45
50
Frequency Temperature Coefficient
FTC
0.032
ppm/C
2
Frequency Aging
Absolute Value during the First Year
|fA|
10
ppm/yr
Impedance @ F
C
Input Z
IN
=R
IN
llC
IN
Z
IN
1
22.6
ll 2.6pf
Output Z
OUT
=R
OUT
llC
OUT
Z
OUT
21.5
ll 3.1pf
Lid Symbolization (Y=year WW=week D=day of week)
488 // YWWS
Standard Reel Quantity
Reel Size 7 Inch
9
500 Pieces/Reel
Reel Size 13 Inch
3000 Pieces/Reel
Pb
PDF 
ZIP