RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 1 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RO2144E_RO2144E-1_RO2144E-2_042505
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Frequency (+25 C) Nominal Frequency RO2144E
f
C
2, 3, 4, 5
916.300
916.700
MHz
RO2144E-1
916.350
916.650
RO2144E-2
916.405
916.595
Tolerance from 916.5 MHz
RO2144E
f
C
200
kHz
RO2144E-1
150
RO2144E-2
95
Insertion Loss
IL
2, 5, 6
1.2
1.6
dB
Quality Factor
Unloaded Q
Q
U
5, 6, 7
8000
8900
50
Loaded Q
Q
L
TBD
Temperature Stability
Turnover Temperature
T
O
6, 7, 8
15
25
35
C
Turnover Frequency
f
O
fc
MHz
Frequency Temperature Coefficient
FTC
0.032
ppm/C
2
Frequency Aging
Absolute Value during the First Year
|fA|
1
10
ppm
DC Insulation Resistance between Any Two Terminals
5
1.0
M
RF Equivalent RLC Model
Motional Resistance
R
M
5, 6, 7, 9
12
17
Motional Inductance
L
M
19.8
H
Motional Capacitance
C
M
1.7
fF
Transducer Static Capacitance
C
P
5, 6, 9
1.9
pF
Test Fixture Shunt Inductance
L
TEST
2, 7
TBD
nH
Lid Symbolization
515 // YWWS
Standard Reel Quantity
Reel Size 7 Inch
10
500 Pieces / Reel
Reel Size 13 Inch
3000 Pieces / Reel
Ideal for 916.5 MHz FCC Part 15 Transmitters
Very Low Series Resistance
Quartz Stability
Complies with Directive 2002/95/EC (RoHS)
The RO2144E is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode stabilization of fixed-frequency transmitters operating at 916.5 MHz.
This SAW is designed specifically for remote-control and data-link transmitters operating in the USA under
FCC Part 15 regulations.
Absolute Maximum Ratings
Rating
Value
Units
Input Power Level
10
dBm
DC Voltage
12
VDC
Storage Temperature
-40 to +125
C
Operating Temperature Range
-40 to +125
C
916.5 MHz
SAW
Resonator
RO2144E
RO2144E-1
RO2144E-2
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
Frequency aging is the change in f
C
with time and is specified at +65C or less. Aging may
exceed the specification for prolonged temperatures above +65C. Typically, aging is great-
est the first year after manufacture, decreasing in subsequent years.
2.
The center frequency, f
C
, is measured at the minimum insertion loss point, IL
MIN
, with the res-
onator in the 50
test system (VSWR
1.2:1). The shunt inductance, L
TEST
, is tuned for par-
allel resonance with C
O
at f
C
. Typically, f
OSCILLATOR
or f
TRANSMITTER
is approximately equal
to the resonator f
C
.
3.
One or more of the following United States patents apply: 4,454,488 and 4,616,197.
4.
Typically, equipment utilizing this device requires emissions testing and government
approval, which is the responsibility of the equipment manufacturer.
5.
Unless noted otherwise, case temperature T
C
= +25C2C.
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: f
C
,
IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
8.
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
.
9.
This equivalent RLC model approximates resonator performance near the resonant fre-
quency 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 capaci-
tance 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.
10.
Tape and Reel Standard for ANSI / EIA 481.
SM3030-6 Case
3.0 X 3.0
Pb
916.5 MHz SAW Resonator
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 2 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RO2144E_RO2144E-1_RO2144E-2_042505
-80 -60 -40 -20
0 +20 +40 +60
0
-50
-100
-150
+80
-200
0
-50
-100
-150
-200
f
C
= f
O
, T
C
= T
O
T =
T
C
- T
O
( C )
(f-
f o
o
) /
f
(ppm
)
0.05 pF*
0.05 pF
Cp
Co
+
=
*Case Parasitics
Cp
Rm
Lm
Cm
Equivalent LC Mode
l
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions
.
Pin
Connection
1
NC
2
Terminal
3
NC
4
NC
5
Terminal
6
NC
Power Test
Electrical Connections
The SAW resonator is bidirectional and
may be installed with either orientation.
The two terminals are interchangeable
and unnumbered. The callout NC indi-
cates 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.
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static
capacitance, C
O
, at F
C
.
Electrical Test
Typical Application Circuits
From 50
Network Analyzer
To 50
Network Analyzer
2
3
6
5
4
1
Low-Loss
Matching
Network to
50
50
Source
at F
C
P
INCIDENT
P
REFLECTED
2 3
6 5 4
1
Modulation
Input
ROXXXXC
Bottom View
200k
C1
L1
(Antenna)
47
+9VDC
C2
RF Bypass
470
Typical Low-Power Transmitter Application
2 3
6 5 4
1
+VDC
ROXXXXC
Bottom View
200k
C1
L1
+VDC
C2
RF Bypass
Typical Local Oscillator Application
Output
2 3
6 5 4
1
1
2
3
6
5
4
1
2
3
6
5
4
A
B
C
D
J
E
F
G
H
I
Case Dimensions
Dimension
mm
Inches
Min
Nom
Max
Min
Nom
Max
A
2.87
3.0
3.13
0.113
0.118
0.123
B
2.87
3.0
3.13
0.113
0.118
0.123
C
1.12
1.25
1.38
0.044
0.049
0.054
D
0.77
0.90
1.03
0.030
0.035
0.040
E
2.67
2.80
2.93
0.105
0.110
0.115
F
1.47
1.6
1.73
0.058
0.063
0.068
G
0.72
0.85
0.98
0.028
0.033
0.038
H
1.37
1.5
1.63
0.054
0.059
0.064
I
0.47
0.60
0.73
0.019
0.024
0.029
J
1.17
1.30
1.43
0.046
0.051
0.056
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