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©2008 by RF Monolithics, Inc. RF1404D - 3/21/08
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency at 25°C Absolute Frequency
f
c
1, 2, 3
433.92 MHz
Insertion Loss
IL
MIN
1, 3 1.6 2.5 dB
Passband Ripple (Relative to IL
MIN
) Fc ±200kHz
1, 3 1.2 1.8 dB
3 dB Bandwidth
BW
3
1, 3
500 600 800
kHz
Rejection Attenuation: (relative to ILmin) 10 - 414 MHz
1, 3
50 55
dB
414 - 424 MHz 45 50
424 - 431 MHz 30 34
431 - 432 MHz 18 22
432 - 433 MHz 12 17
434.92 - 442 MHz 11 14
442 - 550 MHz 35 38
550 - 1000 MHz 50 55
Temperature Freq. Temp. Coefficient
FTC
0.032 ppm/°C
2
Frequency Aging Absolute Value during the First Year |fA| 5 ≤10 ppm/yr
Impedance @ fc
Input Z
IN
= R
IN
llC
IN
Z
IN
1
2853Ω // 1.66pf
Output Z
OUT
= R
OUT
llC
OUT
Z
OUT
2411Ω // 1.73pf
Lid Symbolization (Y=year WW=week S=shift) 539 // YWWS
Standard Reel Quantity Reel Size 7 Inch
9
500 Pieces/Reel
Reel Size 13 Inch 3000 Pieces/Reel
• Ideal Front-End Filter for European Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
• Complies with Directive 2002/95/EC (RoHS)
10
The RF1404D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter
designed to provide front-end selectivity in 433.92 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 security devices operating in
Europe under ETSI I-ETS 300 220.
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 advanced SAW design and fabrication technology is utilized to achieve high
performance and very low loss with simple external impedance matching.
433.92 MHz
SAW Filter
RF1404D
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 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 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.
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 hazadous substances in electrical and electronic equipment.
Pb
