®
RP1237
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•
•
•
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Designed for 418.00 MHz Transmitters
Nominal Insertion Phase Shift of 180° at Resonance
Quartz Stability
418.0 MHz
SAW
Rugged, Hermetic, Low-Profile TO39 Case
Complies with Directive 2002/95/EC (RoHS)
Pb
Resonator
The RP1237 is a two-port, 180° surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It pro-
vides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at
418.0 MHz. The RP1237 is designed specifically for remote-control and wireless security transmitters oper-
ating in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15.231 regulations.
Absolute Maximum Ratings
Rating
Value
+0
Units
dBm
VDC
°C
CW RF Power Dissipation (See: Typical Test Circuit)
DC Voltage Between Any Two Pins (Observe ESD Precautions)
Case Temperature
±30
-40 to +85
TO39-3 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency
f
Absolute Frequency
417.925
418.075
MHz
kHz
dB
C
2, 3, 4, 5,
Df
Tolerance from 418.000 MHz
±75
8.0
C
Insertion Loss
Quality Factor
IL
2, 5, 6
5, 6, 7
5.7
13,600
6,500
62
Q
Unloaded Q
U
Q
50 W Loaded Q
L
T
Temperature Stability
Turnover Temperature
Turnover Frequency
Frequency Temp. Coefficient
Absolute Value during First Year
47
1.0
2.0
77
°C
O
f
f +21
6, 7, 8
kHz
O
C
2
FTC
0.037
ppm/°C
|f |
Frequency Aging
6
5
£ 10
ppm/yr
MW
W
A
DC Insulation Resistance between Any Two Pins
RF Equivalent RLC
R
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
93
152
2.6
M
L
5, 7, 9
5, 6, 9
477.932
0.303334
2.3
µH
M
C
fF
M
C
pF
O
Lid Symbolization (in addition to Lot and/or Date Codes)
RFM P1237
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Frequency aging is the change in f with time and is specified at +65°C or less. Aging may exceed the specification for prolonged temperatures
C
above +65°C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years.
2. The frequency f is the frequency of minimum IL with the resonator in the specified test fixture in a 50 W test system with VSWR £ 1.2:1. Typically,
C
f
or f
is less than the resonator f .
TRANSMITTER C
OSCILLATOR
3. One or more of the following United States patents apply: 4,454,488; 4,616,197.
4. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufac-
turer.
5. Unless noted otherwise, case temperature T = +25°C± 5°C
C
6. The design, manufacturing process, and specifications of this device are subject to change without notice.
7. Derived mathematically from one or more of the following directly measured parameters: f , IL, 3 dB bandwidth, f versus T , and C .
C
C
C
O
8. Turnover temperature, T , is the temperature of maximum (or turnover) frequency, f . The nominal frequency at any case temperature, T , may be
O
O
C
2
calculated from: f = f [1 - FTC (T - T ) ]. Typically, oscillator T is 20° less than the specified resonator T .
O
O
C
O
O
9. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance
is the measured static (nonmotional) capacitance between either pin 1 and ground or pin 2 and ground. The measurement includes case parasitic
C
O
capacitance.
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-9148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RP1237-110499
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©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RFM [ RF MONOLITHICS, INC ]
