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)
Pb
The RF1304 is a low-loss, compact and economical surface-acoustic-wave (SAW) filter designed to provide
front-end selectivity in 391.250 MHz receivers. Typical applications of these FSK receivers are wireless
remote-control and security devices operating in Europe.
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 frequen-
cy stability over a wide temperature range.
TO39-3 Case
Electrical Characteristics
Characteristic
Nominal Frequency
Insertion Loss
4 dB Passband
3 dB Reject Band
Rejection
at f
C
±1.50 MHz
at f
C
±6.0 MHz
at f
C
±50 MHz
Temperature
Operating Case Temperature
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
External Impedance
Absolute Value during the First Year
Series Inductance
Shunt Capacitance
Lid Symbolization (in addition to Lot and/or Date Codes)
T
C
T
O
f
O
FTC
IfAI
L
C
1, 7
3, 7, 8
3
4
-40
15
25
f
C
0.032
10
22
5-18
RFM RF1304
+85
40
Sym
f
C
IL
BW
3
BW
3
Notes
2, 4, 5, 6
3, 4, 7
2, 3, 4, 7
2, 3, 4, 7
10
25
dB
°C
°C
MHz
ppm/°C
2
ppm/yr
nH
pF
±30
Minimum
Typical
391.250
4.0
Maximum
Units
MHz
dB
kHz
kHz
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Typical test circuit is shown for TO-39 RF filters.
2. Passband and reject bands are specified in reference to f
C
.
3. All characteristics are specified over the operating temperature range and typical aging for 10 years.
4. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture. Note that insertion loss, bandwidth, and pass-
band shape are dependent on the impedance matching component values and quality. Demonstration circuits are available for confirmation of device
performance.
5. One or more of the following U.S. Patents apply: 4,454,488; 4,616,197; and other pending.
6. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
7. The design, manufacturing process, and specifications of this device are subject to change without notice.
8. The turnover temperature, T
O
, is the temperature of maximum (or turnover) frequency, f
o
. The nominal frequency at any case temperature, T
C
, out-
side the operating temperature range may be calculated from: f = f
