®
•
•
•
•
Ideal for 916.5 MHz FCC Part 15 Transmitters
Very Low Series Resistance
Quartz Stability
Complies with Directive 2002/95/EC (RoHS)
RO2144E
RO2144E-1
RO2144E-2
Pb
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.
916.5 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
Input Power Level
DC Voltage
Storage Temperature
Operating Temperature Range
Value
10
12
-40 to +125
-40 to +125
Units
dBm
VDC
°C
°C
Electrical Characteristics
Characteristic
Frequency (+25 °C) Nominal Frequency
Sym
RO2144E
RO2144E-1
RO2144E-2
Tolerance from 916.5 MHz
RO2144E
RO2144E-1
RO2144E-2
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50
Ω
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
Transducer Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
10
DC Insulation Resistance between Any Two Terminals
R
M
L
M
C
M
C
P
L
TEST
5, 6, 9
2, 7
5, 6, 7, 9
IL
Q
U
Q
L
T
O
f
O
FTC
|fA|
1
5
1.0
12
19.8
1.7
1.9
TBD
515 // YWWS
6, 7, 8
2, 5, 6
5, 6, 7
8000
15
1.2
8900
TBD
25
fc
0.032
10
∆f
C
f
C
2, 3, 4, 5
Notes
Minimum
916.300
916.350
916.405
Typical
SM3030-6 Case
3.0 X 3.0
Maximum
916.700
916.650
916.595
±200
±150
±95
1.6
dB
kHz
Units
MHz
35
°C
MHz
ppm/°C
2
ppm
MΩ
17
Ω
µH
fF
pF
nH
500 Pieces / Reel
3000 Pieces / Reel
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 great-
est 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 res-
onator in the 50
Ω
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
.
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°C±2°C.
The design, manufacturing process, and specifications of this device are subject to change
without notice.
7.
8.
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 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.
Tape and Reel Standard for ANSI / EIA 481.
2.
9.
3.
4.
5.
6.
10.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
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