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RF1284 (R) 4/6/15 Page 1 of 6
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Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency at 25°C Absolute Frequency f
C
1, 2
319.428 319.588 MHz
Tolerance from 319.500 MHz Δf
C
±80 kHz
Insertion Loss IL 1 2.0 3.0 dB
3 dB Bandwidth BW
3
1, 2
500 600 800
kHz
Rejection at f
c
- 21.4 MHz (Image)
1
40 50
dBat f
c
- 10.7 MHz (LO) 15 40
Ultimate 80
Temperature Operating Case Temperature T
C
3, 4
-40 +85
°C
Turnover Temperature T
O
15 25 35 °C
Turnover Frequency f
O
f
C
MHz
Frequency Temperature Coefficent FTC 0.032
ppm/°C
2
Frequency Aging Absolute Value during the First Year IfAI 5 ≤10 ppm/yr
Impedance @ fc Input Z
IN
=R
IN
//C
IN
Z
IN
1
1570Ω//6.84pf nH
Output Z
OUT
=R
OUT
//C
OUT
Z
OUT
1
1490Ω//7.02pf
pF
Lid Symbolization (in addition to Lot and/or Date Codes) RFM // RF1284 // YYWWS##
TO39-3 Case
• Ideal Front-End Filter for European Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
• Rugged TO39 Hermetic Package
• Complies with Directive 2002/95/EC (RoHS)
The RF1284 is a low-loss, compact and economical surface-acoustic-wave (SAW) filter designed
to provide front-end selectivity in 319.508 MHz receivers. Recevier designs using this filter
include superhet with 10.7 MHz or 500 kHz IF, direct conversion and superregen.
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 (not included). Quartz
construction provides excellent frequency stability over a wide temperature range.
319.508 MHz
SAW Filter
RF1284
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, 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.
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.
Pb
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