RP1234
• Designed for 303.825 MHz Low-Power Superhet Receivers
• 180° Nominal Insertion Phase at Resonance
• Rugged, Hermetic, Low Profile TO-39 Case
293.175 MHz
SAW
Resonator
The RP1234 is a 2-port surface acoustic wave resonator (SAWR) that provides
reliable quartz frequency stabilization of fixed frequency local oscillators at
293.125 MHz. (The nominal SAWR frequency is typically 50 kHz higher than the
nominal radio frequency.) Typical applications include wireless security and remote
control receivers operating in the USA (FCC Part 15), Australia, Japan and Korea.
ABSOLUTE MAXIMUM RATINGS
Rating
CW RF Power Dissipation
Value
+10
Units
dBm
VDC
°C
DC Voltage between any 2 pins (See note 9)
Case Temperature
±30
-40 to +85
TO39-3 Case
ELECTRICAL CHARACTERISTICS
Characteristic
Sym Notes Minimum
Typical
Maximum
293.275
±100
Units
fc
1
293.075
MHz
kHz
dB
Center Frequency (+25°C) Absolute Frequency
Relative to 293.175 MHz
∆fc
IL
Insertion Loss
1
2
13.1
12,000
9,400
53
18.0
Quality Factor
Unloaded Q
QU
QL
50 Ω Loaded Q
Temperature Stability
Turnover Temperature
Turnover Frequency
Freq. Temp. Coefficient
T
2, 3
38
1.0
1.0
68
°C
kHz
ppm/°C2
ppm/yr
MΩ
o
fo
fc + 8.5
0.037
< ±10
FTC
Frequency Aging
4
DC Insulation Resistance between any 2 pins
RF Equivalent RLC Model Motional Resistance
Motional Inductance
Rm
Lm
Cm
Co
2, 5
352
2.31659
0.127215
1.3
695
1.6
Ω
mH
Motional Capacitance
fF
Shunt Static Capacitance
5
pF
Lid Symbolization (in addition to lot and/or date code)
RFM P1234
Notes:
(Unless noted otherwise, case temperature, Tc = +25°C ±2°C.)
1. fc is the frequency of minimum IL with the resonator in a 50 Ω test system with VSWR ≤ 1.2:1. (Typically, fOSCILLATOR < fc )
2. Derived mathematically from one or more of the following directly measured parameters: fc, IL, 3 dB bandwidth, fc vs. Tc , and Co .
3. 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 ]. (Note that oscillator To is typically 20°C less than specified resonator To.)
4. Frequency aging is the change in fc with time and is specified at +65°C or less. Aging may exceed the specification for prolonged tempera-
tures above +65°C. Typically, aging is greatest the first year after manufacture, decreasing in subsequent years.
5. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. Co is the
measured static (nonmotional) capacitance between pin 1 and ground or pin 2 and ground and includes case parasitic capacitance.
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: 4,454,488 and 4,616,197. RFM is a registered trademark of RF Monolithics, Inc.
8. Equipment utilitizing this device typically requires emissions testing and government approval, which is the responsibility of the equipment
manufacturer.
9. CAUTION: ELECTROSTATIC SENSITIVE DEVICE. Observe precautions for handling.
RP1234.CHP-A-01-121994AC RPBACK.CHP © 1994 RF Monolithics, Inc.
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