RP1285
916.55 MHz
SAW Resonator
•
•
•
•
Ideal for 916.5 MHz FCC Part 15.249 Transmitters
Nominal Insertion Phase Shift of 180° at Resonance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
The RP1285 is a two-port, 180° surface-acoustic-wave (SAW) resonator in a low-pro-
file TO39 case. It provides reliable, fundamental-mode, quartz frequency stabilization
of fixed-frequency transmitters operating at 916.5 MHz. The RP1285 is designed spe-
cifically for remote-control and data-link transmitters operating in the USA under FCC
Part 15.249 regulations and in Canada under DoC RSS-210.
TO39-3 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical Maximum
916.700
Units
f
Center Frequency (+25°C)
Absolute Frequency
916.400
MHz
kHz
dB
C
2, 3, 4, 5,
2, 5, 6
Df
Tolerance from 916.550 MHz
±150
C
Insertion Loss
Quality Factor
IL
7.5
6,500
3,800
38
10.0
Q
Unloaded Q
U
5, 6, 7
Q
50 W Loaded Q
L
T
Temperature Stability
Turnover Temperature
Turnover Frequency
Frequency Temp. Coefficient
Absolute Value during First Year
23
53
°C
O
f
6, 7, 8
f +5.7
kHz
O
C
ppm/°C2
ppm/yr
MW
FTC
0.037
|f |
Frequency Aging
6
5
£ 10
A
DC Insulation Resistance between Any Two Pins
1.0
R
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
137
155.005
0.194528
2.0
217
2.3
W
M
L
5, 7, 9
5, 6, 9
µH
fF
M
C
M
C
1.7
pF
O
Lid Symbolization (in addition to Lot and/or Date Codes)
RFM P1285
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. 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 in subsequent years.
2. The frequency fC 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,
fOSCILLATOR or fTRANSMITTER is less than the resonator fC.
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 TC = +25°C± 2°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: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8. 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]. Typically, oscillator TO is 20° less than the specified resonator TO.
9. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance
CO is the measured static (nonmotional) capacitance between either pin 1 and ground or pin 2 and ground. The measurement includes case para-
sitic capacitance.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
E-mail: info@rfm.com
http://www.rfm.com
RP1285-120298
Page 1 of 2
©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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