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RO3144C
•
•
•
•
Ideal for 916.5 MHz Remote Control and Data Telemetry Transmitters
Very Low Series Resistance
Quartz Stability
Pb
Complies with Directive 2002/95/EC (RoHS)
The RO3144C is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization of low power transmitters operating at
916.5 MHz. This SAW resonator is specifically designed for transmitters used in remote control and data
telemetry applications operating in the USA under FCC Part 15 and in Canada under DoC RSS-210.
916.5 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
Input Power Level
DC Voltage
Storage Temperature
Soldering Temperature (10 seconds / 5 cycles maximum)
Value
0
12
-40 to +85
260
Units
dBm
VDC
°C
°C
SM5050-8 Case
5X5
Typical
Maximum
916.700
±200
1.2
26000
2800
2.5
Electrical Characteristics
Characteristic
Frequency, +25 °C
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50 Loaded Q
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
RF Equivalent RLC Model
Absolute Value during the First Year
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
DC Insulation Resistance between Any Two Terminals
R
M
L
M
C
M
C
O
L
TEST
5, 6, 9
2, 7
5, 7, 9
Absolute Frequency
Tolerance from 916.500 MHz
Sym
f
C
f
C
IL
Q
U
Q
L
T
O
f
O
FTC
|f
A
|
Notes
2, 3, 4, 5
2, 5, 6
Minimum
916.300
Units
MHz
kHz
dB
10
6, 7, 8
1, 6
5
1.0
25
f
C
0.032
10
12.7
55.9
.54
2.2
13.5
691 // YWWS
500 Pieces / Reel
3000 Pieces / Reel
40
°C
ppm/°C
2
ppm/yr
M
µH
fF
pF
nH
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
Frequency aging is the change in f
C
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, f
C
, is measured at the minimum insertion loss point,
IL
MIN
, with the resonator in the 50
test system (VSWR
1.2:1). The
shunt inductance, L
TEST
, is tuned for parallel resonance with C
O
at f
C
.
Typically, f
OSCILLATOR
or f
TRANSMITTER
is approximately equal to the
resonator f
C
.
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 T
C
= +25 ± 2 °C.
6.
7.
8.
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: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
Turnover temperature, T
O
, is the temperature of maximum (or turnover)
frequency, f
O
. The nominal frequency at any case temperature, T
C
, may be
calculated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
]. Typically
oscillator
T
O
is
approximately equal to the specified
resonator
T
O
.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance C
O
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: C
P
C
O
- 0.05 pF.
2.
3.
4.
5.
9.
©2010-2014 by Murata Electronics N.A., Inc.
RO3144C (R) 5/1/14
Page 1 of 2
www.murata.com
Electrical Connections
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.
Pin
1
2
3
4
5
6
7
8
NC
Connection
Terminal
NC
NC
NC
Terminal
NC
NC
Parameter Test Circuit
7
From 50
Network Analyzer
1
8
4
2
3
To 50
Network Analyzer
6
5
Power Test Circuit
B
8
1
A
2
3
4
7
6
5
C
E
8
D 7
6
5
4
F
Modulation
Input
NC
NC
1
2
3
G
50
Source
at F
C
P
INCIDENT
P
REFLECTED
Low-Loss
Matching
Network to
50
1
2
8
4
5
3
NC
7
NC
6
NC
NC
Example Application Circuits
Typical Low-Power Transmitter Application
200k
C1
L1
(Antenna)
+9VDC
47
L
J
M
P
1
2
8
4
5
3
7
ROXXXXC
Bottom View
6
C2
RF Bypass
470
H
I
Q
N
K
O
Typical Local Oscillator Application
200k
+VDC
C1
L1
Output
+VDC
1
2
8
4
3
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
Min
4.80
4.80
1.30
1.98
1.07
0.50
2.39
(f-fo ) / fo (ppm)
mm
Nom
5.00
5.00
1.50
2.08
1.17
0.64
2.54
1.27
0.76
1.55
2.79
0.76
2.36
1.55
2.79
2.79
2.79
Max
5.20
5.20
1.70
2.18
1.27
0.70
2.69
Min
0.189
0.189
0.050
0.078
0.042
0.020
0.094
Inches
Nom
0.197
0.197
0.060
0.082
0.046
0.025
0.100
0.050
0.030
0.061
0.110
0.030
0.093
0.061
0.110
0.110
0.110
7
6
5
C2
Max
0.205
0.205
0.067
0.086
0.050
0.028
0.106
ROXXXXC
Bottom View
RF Bypass
Equivalent RLC Model
0.05 pF*
Co = Cp + 0.05 pF
*Case Parasitics
Cp
Rm
Lm
Cm
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions.
f
C
= f
O
, T
C
= T
O
0
-50
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-100
-150
-200
-80 -60 -40 -20
T = T
C
- T
O
( °C )
©2010-2014 by Murata Electronics N.A., Inc.
RO3144C (R) 5/1/14
Page 2 of 2
www.murata.com
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