• Ideal Front-End Filter for European Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
• Wide Bandwidth for Multi-Channel Receiver Application
• Complies with Directive 2002/95/EC (RoHS)
The RF1400D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide 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. Wider bandwidth for channelized receiver
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.
3.8 x 3.8
Center Frequency at 25°C Absolute Frequency
3 dB Bandwidth
10 - 414 MHz
414 - 425 MHz
426 - 432 MHz
435 - 442 MHz
442 - 550 MHz
550 - 1000 MHz
Frequency Temperature Coefficient
Absolute Value during the First Year
Impedance @ fc
Input ZIN = RINllCIN
Output ZOUT = ROUTllCOUT
Lid Symbolization (Y=year WW=week D=day of week)
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
1, 2, 3
1, 2, 3
279Ω ll 4.1pf
279Ω ll 4.1pf
490 // YWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
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, fc. Note that insertion loss and bandwidth and passband shape are
dependent on the impedance matching component values and quality.
2. The frequency fc 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 +105°C.
4. The turnover temperature, TO, is the temperature of maximum (or turnover) frequency, fo. The nominal frequency at any case temperature, Tc, may be calculated
from: f = fo [1 - FTC (To - Tc)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. Typ-
ically, 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: (972) 233-2903
Fax: (972) 387-8148
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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