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RO2044
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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
Resonator
Pb
The RO2044 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It
provides 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
transmitters operating in the USA under FCC Part 15, in Canada under Doc RSS-210, and in Australia.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation
+0
dBm
DC Voltage Between Terminals (Observe ESD Precautions)
±30
VDC
-40 to +85
°C
Case Temperature
Characteristic
Frequency (+25 °C)
Sym
fC
Nominal Frequency
fC
Tolerance from 318.000 MHz
Insertion Loss
Quality Factor
Temperature Stability
Frequency Aging
IL
Unloaded Q
QU
50 Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
Frequency Temperature Coefficient
FTC
Absolute Value during the First Year
|fA|
DC Insulation Resistance between Any Two Pins
RF Equivalent RLC Model
Notes
2, 3, 4, 5
1, 6
LM
Motional Capacitance
CM
Pin 1 to Pin 2 Static Capacitance
CO
5, 6, 9
Transducer Static Capacitance
CP
5, 6, 7, 9
LTEST
2, 7
Units
318.100
MHz
±100
kHz
5.0
dB
2400
29
Motional Inductance
Maximum
10400
6, 7, 8
RM
Lid Symbolization (in addition to Lot and/or Date Codes)
2.4
5, 6, 7
5
Typical
317.900
2, 5, 6
Motional Resistance
Test Fixture Shunt Inductance
Minimum
TO39-3 Case
44
59
kHz
0.037
ppm/°C2
ppm/yr
10
1.0
M
32
5, 6, 7, 9
78
160.269
µH
1.56292
2.9
°C
fC+4.2
fF
3.0
pF
pF
78
nH
3.2
3.6
RFM // RO2044 // YWWS##
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
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.
The center frequency, fC, is measured at the minimum insertion loss point, ILMIN, with the resonator in the 50 test system (VSWR 1.2:1). The shunt
inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOSCILLATOR or fTRANSMITTER is less than the resonator fC.
One or more of the following United States patents apply: 4,454,488 and 4,616,197 and others pending.
Typically, equipment designs utilizing this device require emissions testing and government approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature TC = +25°C±2°C.
The design, manufacturing process, and specifications of this device are subject to change without notice.
Derived mathematically from one or more of the following directly measured parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
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°C less than the specified resonator TO.
This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance CO is the
static (nonmotional) capacitance between pin1 and pin 2 measured at low frequency (10 MHz) with a capacitance meter. The measurement includes case
parasitic capacitance with a floating case. For usual grounded case applications (with ground connected to either pin 1 or pin 2 and to the case), add
approximately 0.25 pF to CO.
©2010-2014 by Murata Electronics N.A., Inc.
RO2044 (R) 3/24/14
Page 1 of 2
www.murata.com
Electrical Connections
This one-port, two-terminal SAW resonator is bidirectional. The terminals
are interchangeable with the exception of circuit board layout.
1
Connection
Bottom View
Pin 1
Terminal 1
2
Terminal 2
3
Case Ground
The curve shown on the right
accounts for resonator
contribution only and does not
include oscillator temperature
characteristics.
Pin 2
fC = f O , T C = T O
0
0
-50
-50
-100
-100
-150
-150
(f-fo ) / fo (ppm)
Pin
Temperature Characteristics
Pin 3
-200
-80 -60 -40 -20
-200
0 +20 +40 +60 +80
T = T C - T O ( °C )
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO at FC.
Equivalent LC Model
The following equivalent LC model is valid near resonance:
Electrical Test:
1
2
1
Network
Analyzer
2
Network
Analyzer
Co= Cp + 0.25 pF*
Cp
3
R
M
L
C
M
*Case Parasitics
M
0.5 pF*
0.5 pF*
Power Test:
3
1
P
INCIDENT
Low-Loss
Matching
Network
to 50
50
Source at P
REFLECTED
F
C
Case Design
3
2
C
-P
P
INCIDENT
REFLECTED
CW RF Power Dissipation =
Typical Application Circuits
200k
D
(3 places)
J
(2 places)
MPS-H10
+9VDC
L1
(Antenna)
2
Dimensions
C2
ROXXXX
Bottom View
3
RF Bypass
470
Output
C1
1
L1
+VDC
2
Millimeters
Min
Bottom View
C2
3
©2010-2014 by Murata Electronics N.A., Inc.
RO2044 (R) 3/24/14
Page 2 of 2
Max
9.30
0.366
3.18
0.125
2.50
3.50
0.098
0.138
D
0.46 Nominal
0.018 Nominal
E
5.08 Nominal
0.200 Nominal
F
2.54 Nominal
0.100 Nominal
G
2.54 Nominal
0.100 Nominal
J
RF Bypass
Min
A
H
ROXXXX
Max
Inches
B
C
Typical Local Oscillator Application:
+VDC
45°
47
C1
1
H
F
E
A
Typical Low-Power Transmitter Application:
Modulation
Input
G
B
1.02
1.40
0.040
0.055
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