RF1238(2008) 데이터 시트보기 (PDF) - RF Monolithics, Inc
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RF1238 Datasheet PDF : 2 Pages
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• Ideal Front-End Filter for 318.0 MHz Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
• Rugged TO39 Hermetic Package
• Complies with Directive 2002/95/EC (RoHS)
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The RF1238 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed
to provide front-end selectivity in 318.0 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 the USA under FCC
Part 15, in Canada under DoC RSS-210, and in Australia.
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.
RF1238
318.0 MHz
SAW Filter
TO39-3 Case
Electrical Characteristics
Characteristic
Nominal Frequency at 25°C
Insertion Loss
3 dB Bandwidth
Rejection
Temp. Characteristics
Absolute Frequency
Tolerance from 318.0 MHz
at fC - 21.4 MHz (Image)
at fC - 10.7 MHz (LO)
Ultimate
Operating Case Temp.
Turnover Temperature
Turnover Frequency
Freq. Temp. Coefficient
Frequency Aging
External Impedance Match Series Inductance
Shunt Capacitance (Tab Side, Non Tab Side)
Lid Symbolization (in addition to Lot and/or Date Codes)
Sym
fC
∆fC
IL
BW3
TC
TO
fO
FTC
IfAI
L
C
Notes
1, 2
1
1, 2
1
3, 4
5
1
Minimum Typical Maximum
318.0
±80
1.7
3.5
500
700
800
40
50
15
40
80
-40
+85
30
45
60
fC+4
0.032
≤10
86
6.8 on Pin 1 Side, 4.7 on Pin 2 Side
RFM RF1238
Units
MHz
kHz
dB
kHz
dB
°C
°C
kHz
ppm/°C2
ppm/yr
nH
pF
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, fc. Note that insertion loss, 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.
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. 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.
www.RFM.com E-mail: info@rfm.com
©2008 by RF Monolithics, Inc.
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RF1238 - 3/21/08
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