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RO3144A
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Designed for 916.5 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Surface-mount Ceramic Case
Complies with Directive 2002/95/EC (RoHS)
916.5 MHz
SAW
Resonator
Pb
The RO3144A is a one-port surface-acoustic-wave (SAW) resonator packaged in a surface-mount ceramic
case. It provides reliable, fundamental-mode quartz frequency stabilization of fixed-frequency transmitters
operating at 916.5 MHz.
Absolute Maximum Ratings
Rating
Value
CW RF Power Dissipation
DC Voltage Between Terminals
Case Temperature
dBm
±30
VDC
-40 to +85
°C
260
°C
Soldering Temperature, 10 seconds / 5 cycles maximum
Electrical Characteristics
Characteristic
Sym
Frequency, +25 °C
Units
0
Notes
RO3144A
fC
RO3144A-1
RO3144A-2
Tolerance from 916.5 MHz
2,3,4,5
RO3144A
SM5035-4
Minimum
Typical
916.700
916.350
916.650
916.400
916.600
Frequency Aging
Unloaded Q
IL
2,5,6
1.2
QU
5,6,7
6600
50 Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
6,7,8
Frequency Temperature Coefficient
FTC
Absolute Value during the First Year
|fA|
1
5
Motional Resistance
RM
Motional Inductance
LM
Motional Capacitance
CM
Shunt Static Capacitance
CO
Test Fixture Shunt Inductance
2.5
dB
750
10
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
kHz
±100
Insertion Loss
Temperature Stability
MHz
±150
RO3144A-2
Quality Factor
Units
±200
fC
RO3144A-1
Maximum
916.300
LTEST
Lid Symbolization
25
40
°C
fC
kHz
0.032
ppm/°C2
ppm/yr
<±10
1.0
M
13.1

5, 6, 7, 9
15
µH
2.1
fF
5, 6, 9
2.09
pF
2, 7
14.5
nH
RO3144A: 663, RO3144A-1: 897, RO3144A-2: 813, // YYWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
2.
3.
4.
5.
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.
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 approximately equal to the
resonator fC.
One or more of the following United States patents apply: 4,454,488 and
4,616,197.
Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment
manufacturer.
Unless noted otherwise, case temperature TC = +25 ± 2 °C.
©2010-2014 by Murata Electronics N.A., Inc.
RO3144A (R) 4/24/14
6.
7.
8.
9.
Page 1 of 2
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
approximately equal to 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 the two terminals
measured at low frequency (10 MHz) with a capacitance meter. The
measurement includes parasitic capacitance with "NC” pads unconnected.
Case parasitic capacitance is approximately 0.05 pF. Transducer parallel
capacitance can by calculated as: CP  CO - 0.05 pF.
www.murata.com
Electrical Connections
Equivalent RLC Model
The SAW resonator is bidirectional and may be
installed with either orientation. The two terminals
are interchangeable and unnumbered. The callout
NC indicates no internal connection. The NC pads
assist with mechanical positioning and stability.
External grounding of the NC pads is
recommended to help reduce parasitic
capacitance in the circuit.
C
Terminal
L
Terminal
C
C
S
C
M
P
C
C
Case Ground
Case Ground
P
R
M
S
O
= 0 .0 5 p F (C a s e P a r a s itic s )
= S A W S ta tic C a p a c ita n c e
= C S + C P
M
Temperature Characteristics
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
ELECTRICAL TEST
fC = f O , T C = T O
-50
-50
-100
-100
-150
-150
-200
0 +20 +40 +60 +80
-200
-80 -60 -40 -20
Case
T = TC - T O ( °C )
To 50 
Network Analyzer
From 50 
Network Analyzer
0
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
T o p V ie w
S id e V ie w
B
C
B o tto m
V ie w
E (3 x )
4
F (4 x )
1
A
POWER TEST
3
P
INCIDENT
50  Source
P
at F C
REFLECTED
Low-Loss
Matching
Network to
50 
2
Terminal
G
(1 x )
NC
NC
D
Terminal
H
CW RF Power Dissipation =
P INCIDENT - P REFLECTED
I
Typical Application Circuits
I
Typical Low-Power Transmitter Application
H
+9VDC
Modulation
Input
I
H
J
H
200k 
C1
47
K
L1
(Antenna)
L
PCB Land Pattern
Top View
C2
RF Bypass
RO3XXXA
Bottom View
470
Dimensions
A
Typical Local Oscillator Applications
Output
+VDC
C1
+VDC
L1
C2
RO3XXXA
Bottom View
©2010-2014 by Murata Electronics N.A., Inc.
RO3144A (R) 4/24/14
RF Bypass
Page 2 of 2
Millimeters
Inches
Min
Nom
Max
Min
Nom
Max
4.87
5.00
5.13
0.191
0.196
0.201
B
3.37
3.50
3.63
0.132
0.137
0.142
C
1.45
1.53
1.60
0.057
0.060
0.062
D
1.35
1.43
1.50
0.040
0.057
0.059
E
0.67
0.80
0.93
0.026
0.031
0.036
F
0.37
0.50
0.63
0.014
0.019
0.024
G
1.07
1.20
1.33
0.042
0.047
0.052
H
-
1.04
-
-
0.041
-
I
-
1.46
-
-
0.058
-
J
-
3.01
-
-
0.119
-
K
-
1.44
-
-
0.057
-
L
-
1.92
-
-
0.076
-
www.murata.com
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