Preliminary
®
RO2044
•
•
•
•
•
Designed for 318 MHz Transmitter Applications
Low Series Resistance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
Complies with Directive 2002/95/EC (RoHS)
318.00 MHz
SAW
Pb
Resonator
The RO2044 is a true one-port, 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
or near 318 MHz. The RO2044 is designed specifically for remote-control and wireless security AM transmit-
ters operating in the USA under FCC Part 15, in Canada under Doc RSS-210, and in Australia.
Absolute Maximum Ratings
Rating
Value
+0
Units
dBm
VDC
°C
CW RF Power Dissipation
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature
±30
-40 to +85
TO39-3 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximu
Units
f
Frequency (+25 °C)
Nominal Frequency
317.900
318.100
MHz
C
2, 3, 4, 5
Df
Tolerance from 318.000 MHz
±100
5.0
kHz
dB
C
Insertion Loss
Quality Factor
IL
2, 5, 6
5, 6, 7
2.4
10400
2400
44
Q
Unloaded Q
U
Q
T
50 W Loaded Q
L
Temperature Stability
Turnover Temperature
Turnover Frequency
29
1.0
2.9
59
°C
O
f
f +4.2
6, 7, 8
kHz
O
C
2
Frequency Temperature Coefficient
Absolute Value during the First Year
FTC
|fA|
0.037
10
ppm/°C
Frequency Aging
1, 6
5
ppm/yr
MW
W
DC Insulation Resistance between Any Two Pins
R
RF Equivalent RLC Model
Motional Resistance
32
160.269
1.56292
3.2
78
M
L
Motional Inductance
5, 6, 7, 9
µH
M
C
Motional Capacitance
fF
M
C
Pin 1 to Pin 2 Static Capacitance
Transducer Static Capacitance
5, 6, 9
5, 6, 7, 9
2, 7
pF
3.6
O
C
pF
3.0
P
LTEST
Test Fixture Shunt Inductance
78
nH
Lid Symbolization (in addition to Lot and/or Date Codes)
RFM // RO2044 // YWWS##
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.
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) fre-
quency, fO. The nominal frequency at any case temperature, TC, may be calcu-
lated from: f = fO [1 - FTC (TO -TC)2]. Typically, oscillator TO is 20°C less than
the specified resonator TO.
9. This equivalent RLC model approximates resonator performance near the reso-
nant frequency and is provided for reference only. The capacitance CO is the
Aging may exceed the specification for prolonged temperatures above +65°C.
Typically, aging is greatest the first year after manufacture, decreasing signifi-
cantly in subsequent years.
2. The center frequency, fC, is measured at the minimum insertion loss point, ILMIN
,
with the resonator in the 50 W test system (VSWR £ 1.2:1). The shunt induc-
tance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOSCILLA-
TOR or fTRANSMITTER is less than the resonator fC.
3. One or more of the following United States patents apply: 4,454,488 and
4,616,197 and others pending.
4. Typically, equipment designs utilizing this device require emissions testing and
government approval, which is the responsibility of the equipment manufacturer.
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.
static (nonmotional) capacitance between pin1 and pin 2 measured at low fre-
quency (10 MHz) with a capacitance meter. The measurement includes case
parasitic capacitance with a floating case. For usual grounded case applica-
tions (with ground connected to either pin 1 or pin 2 and to the case), add
approximately 0.25 pF to CO.
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-8148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RO2044-082802
Page 1 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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