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© 2009-2011 by RF Monolithics, Inc. RO3144A - 8/15/11
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Frequency, +25 °C RO3144A fC
2,3,4,5
916.300 916.700 MHzRO3144A-1 916.350 916.650
RO3144A-2 916.400 916.600
Tolerance from 916.5 MHz RO3144A
∆fC
±200 kHzRO3144A-1 ±150
RO3144A-2 ±100
Insertion Loss IL 2,5,6 1.2 2.5 dB
Quality Factor Unloaded Q QU5,6,7 6600
50 Ω Loaded Q QL750
Temperature Stability Turnover Temperature TO6,7,8 10 25 40 °C
Turnover Frequency fOfCkHz
Frequency Temperature Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 1 <±10 ppm/yr
DC Insulation Resistance between Any Two Terminals 5 1.0 MΩ
RF Equivalent RLC Model Motional Resistance RM5, 6, 7, 9 13.1 Ω
Motional Inductance LM15 µH
Motional Capacitance CM2.1 fF
Shunt Static Capacitance CO5, 6, 9 2.09 pF
Test Fixture Shunt Inductance LTEST 2, 7 14.5 nH
Lid Symbolization RO3144A: 663, RO3144A-1: 897, RO3144A-2: 813, // YWWS
• Ideal for 916.5 MHz Transmitters
• Very Low Series Resistance
• Quartz Stability
• Surface-mount Ceram ic Case
• Complies with Directive 2002/95/EC (RoHS)
The RO3144A is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode, qua rtz frequency stabilization of fix ed-frequency transm itters
operating at 916.5 MHz.
Absolute Maximum Ratings
Rating Value Units
CW RF Power Dissipation 0 dBm
DC Voltage Between Terminals ±30 VDC
Case Temperature -40 to +85 °C
Soldering Temperature, 10 seconds / 5 cycles maximum 260 °C
916.5 MHz
SAW
Resonator
RO3144A
RO3144A-1
RO3144A-2
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Frequency agin g is the chang e in fC with time an d is specif ied at +6 5 °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.
2. The center frequency, fC, is measured at the minimum insertion loss point,
ILMIN, with the res onator in the 50 Ω test system (VSWR ≤ 1.2:1). The
shunt inductance, LTEST, is tuned for paralle l resonance with CO at fC.
Typi cally, fOSCILLATOR or fTRANSMITTER is approximately equal to the
resonator fC.
3. One or more of the following Unite d Sta tes patents apply: 4,454,488 and
4,616,197.
4. Typically, equipment utilizing this device requires emissions testing and
government app roval, which is the responsibilit y of the equipment
manufacturer.
5. Unless noted otherwise, case temperature TC=+25 ± 2 °C.
6. The design, manufacturing process , and specif ications of this device are
subject to change without notice.
7. Derived mat hematically from one or more of the following directly
measured parameters : fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8. Turnover temperature, TO, is the temperature of maximum (or turnover )
frequenc y, fO. The nominal f requency at any case tempera ture, T C, may be
calculated from: f = fO[1 - FTC (TO-TC)2]. Typically oscillator TO is
approximately equal to the specified resonator TO.
9. This equivalent RLC model approximate s resonator pe rformance near the
resonan t frequen cy and is provided for refer ence o nly. The capaci tanc e CO
is the static (nonmotional) capac i tance between the tw o terminals
measured at low frequency (10 MHz) with a cap ac i tance meter. The
measureme nt includes p arasitic cap acitanc e with "NC” pads unconne cted.
Case pa rasitic capacitance is approximat ely 0.05 pF. Transducer parallel
capacitance can by calculated as: CP≈CO-0.05pF.
SM5035-4
Pb
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© 2009-2011 by RF Monolithics, Inc. RO3144A - 8/15/11
Electrical Connections
The SAW resonator is bidirectional and may be
installed with either orientation. T he 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.
Typical Test Circuit
The test circuit inductor , LTEST, is tuned to resonate with the static
capacitance, CO, a t FC.
Typical Application Circuits
Equivalent Model
Temperature Characteristics
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
Case
Terminal
Terminal
Case Ground
Case Ground
ELECTRICAL TEST
From 50 Ω
Network Analyzer To 50 Ω
Networ k A nalyzer
50 Ω Source
at FCREFLECTED
INCIDENT
P
P
Low-Loss
Matching
Network to
50 Ω
Terminal
Terminal
NC NC
POWE R T EST
CW RF Power Dissipation = INCIDENT - REFLECTED
P P
C1
C2
L1
(Antenna)
+9VDC
47
RF Bypass
Modulation
Input
Typical Low-Power Transmitter Application
RO3XXXA
Bottom View 470
200kΩ
C1
C2
L1
Output
+VDC
RF Bypass
+VDC
Typical Local Oscillator Applications
RO3XXXA
Bottom View
Dimensions Millimeters Inches
Min Nom Max Min Nom Max
A 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 - 0.50 - - 0.019 -
K - 1.05 - - 0.041 -
L - 1.44 - - 0.057 -
M - 0.71 - - 0.028 -
0.05 pF*
0.05 pF
Cp
Co+
=
*Case Parasitics
Cp
Rm
Lm C m
-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-foo
)/f(ppm)
A
B C
D
E ( 3 x )
F ( 4 x )
G ( 1 x )
T o p V i e w S i d e V i e w B o t t o m V i e w
1
2
3
4
H
H
H
I
J
I
I
H
K K
L
M
PCB Land Pattern
Top View
