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©2008 by RF Monolithics, Inc. RO3144D - 3/27/08
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Frequency (+25 °C) Nominal Frequency RO3144D fC
2, 3, 4, 5
916.300 916.700 MHz
RO3144D-1 916.350 916.650
RO3144D-2 916.400 916.600
Tolerance from 916.5 MHz RO3144D
ΔfC
±200 kHzRO3144D-1 ±150
RO3144D-2 ±100
Insertion Loss IL 2, 5, 6 1.20 2.5 dB
Quality Factor Unloaded Q QU5, 6, 7 6800
50 Ω Loaded Q QL700
Temperature S tability Turnover Temperature TO6, 7, 8 10 25 40 °C
Turnover Frequency fOfc MHz
Frequency Temperature Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 1 10 ppm
DC Insulation Resistance between Any Two Terminals 5 1.0 MΩ
RF Equivalent RLC Model Motional Resistance RM5, 6, 7, 9 11.8 Ω
Motional Inductance LM14 µH
Motional Capacitance CM2.1 fF
Transducer Static Capacitance CO5, 6, 9 2.1 pF
Test Fixture Shunt Inductance LTEST 2, 7 14.3 nH
Lid Symbolization RO3144D 692, RO3144D-1 767, RO3144D-2 768 / 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 RO3144D 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 V oltage 12 VDC
S torage Temperature -40 to +85 °C
Soldering Temperature (10 seconds / 5 cycles max.) 260 °C
916.5 MHz
SAW
Resonator
RO3144D
RO3144D-1
RO3144D-2
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. 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 subse-
quent years.
2. The center frequency , fC, is measured at the minimum insertion loss point, ILMIN,
wit h the resonator in the 5 0 Ω 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.
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 TC= +25°C±2°C.
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: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8. Turnover temperature, TO, is the temperature of maximum (or turnover)
frequency, fO. The nominal frequency at any case temperature, TC, may be
calculat ed fro m: f = fO[1 - FTC (TO-TC)2]. Typically oscillator TO is
approximately equal to the specified resonator TO.
9. 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. T ransducer parallel capacitance can by calculated as:
CP≈CO-0.05pF.
10. Tape and Reel Standa rd Per ANSI/EIA 481.
SM3838-6 Case
3.8 X 3.8
Pb
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©2008 by RF Monolithics, Inc. RO3144D - 3/27/08
-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
Δ
T = T
C
- T
O
( °C )
(f-foo
)/f(ppm)
0.05 pF*
0.05 pF
Cp
Co+
=
*Case Parasitics
Cp
Rm Lm Cm
Equivalent LC Model
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions.
Pin Connection
1NC
2 Terminal
3NC
4NC
5 Terminal
6NC
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
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 Tes t Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
Electri cal Tes t
Typical Application Circuits
Low-Loss
Matching
Network to
50 Ω
50 Ω Source
at FC
PINCIDENT
PREFLECTED
2 3
6 5 4
1
Modulation
Input
ROXXXXC
Bottom View
200k Ω
C1
L1
(Antenna)
47
+9VDC
C2
RF Bypass
470
Typical Low-Power T ransmitter Application
2 3
6 5 4
1
+VDC
ROXXXXC
Bottom View
200k Ω
C1
L1
+VDC
C2
RF Bypass
Typica l Local Oscillator Application Output
2 3
6 5 4
1
Case Dimensions
Dimension mm Inches
Min Nom Max Min Nom Max
A3.60 3.80 4.0 0.14 0.15 0.16
B3.60 3.80 4.0 0.14 0.15 0.16
C1.00 1.20 1.40 0.04 0.05 0.055
D0.95 1.10 1.25 0.033 0.043 0.05
E2.39 2.54 2.69 0.090 0.10 0.110
G0.90 1.0 1.10 0.035 0.04 0.043
H1.90 2.0 2.10 0.75 0.08 0.83
I0.50 0.6 0.70 0.020 0.024 0.028
J1.70 1.8 1.90 0.067 0.07 0.075
1
2
3
6
5
4
1
2
3
6
5
4
A
BC
DJ
E
GH
I