RF1408D Datasheet, PDF (1/2 Pages) RF Monolithics, Inc – Ideal Front-End Filter for Domestic Wireless Receivers 447.7 MHz SAW Filter

®
RF1408D
• 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 RF1408D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 447.7 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
447.7 MHz
SAW Filter
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
SM3838-8 Case
3.8 x 3.8
Characteristic
Center Frequency at 25°C
Insertion Loss
Absolute Frequency
3 dB Bandwidth
Rejection Attenuation: (relative to ILmin)
10 - 409 MHz
409 - 434 MHz
434 - 443 MHz
443 - 445 MHz
445 - 446.7 MHz
448.7 - 449.7 MHz
449.7 - 456 MHz
456 - 458 MHz
458 - 487 MHz
487 - 1000 MHz
Temperature
Freq. Temp. Coefficient
Frequency Aging
Absolute Value during the First Year
Impedance @ fc
Input Z_IN=R_INllC_IN
Output Z_OUT=R_OUTllC_OUT
Lid Symbolization (Y=year WW=week S=shift)
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
Sym
f_c
IL_MIN
BW₃
FTC
lfAl
Z_IN
Z_OUT
Notes
1, 2, 3
1, 3
1, 3
1, 3
5
1
9
Minimum
Typical
Maximum
447.7
1.5
2.0
500
840
1100
45
60
40
55
33
35
20
33
9
12
9
15
16
20
31
38
38
40
39
55
0.032
≤10
221.86Ω // 1.25pf
172.02Ω // 126.49fF
511 // YWWS
500 Pieces/Reel
3000 Pieces/Reel
Units
MHz
dB
kHz
dB
ppm/°C²
ppm/yr
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.
RF Monolithics, Inc. Phone: [phone]
Fax: [phone]
RFM Europe
Phone: [phone]
Fax: [phone]
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [e-mail]
http://www.rfm.com
RF1408D-9/14/07
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