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©2008 by RF Monolithics, Inc. RO3112D - 3/27/08
CAUTION: Elec trostatic Sensitive D evic e. Obs erve precautions for handling.
Notes:
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency (+25 °C) Absolute Frequency fC2,3,4,5 433.345 433.495 MHz
Tolerance from 433.420 MHz ΔfC±75 kHz
Insertion Loss IL 2,5,6 1.2 2.5 dB
Quality Factor Unloaded Q QU5,6,7 8400
50 Ω Loaded Q QL1000
Temperature Stability Turnover Temperature TO6,7,8 10 25 40 °C
Turnover Frequency fOfC
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 Mot ional Resistance RM5, 7, 9 13.7 Ω
Motional Inductance LM42.2 µH
Motional Capacitance CM3.2 fF
Shunt Static Capacitance CO5, 6, 9 3.7 pF
Test Fixture Shunt Inductance LTEST 2, 7 36.2 nH
Lid Symbolization (in addition to Lot and/or Date Codes) 683 // YWWS
Standard Reel Quantity Reel Size 7 Inch 500 Pieces/Reel
Reel Size 13 Inch 3000 Pieces/Reel
• Ideal for European 433.420 MHz Transmitters
• Very Low Series Resistance
• Quartz Stability
• Complies with Directive 2002/95/EC (RoHS)
The RO3112D is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case.
It provides reliable, fundam ental-mode, quartz frequency stabilization of fixed-frequency transmitters
operating at 433.420 MHz. This SAW is designed specifically for remote-control and wireless security
transmitters operating in Europe under ETSI I-ETS 300 220 and in Germany under FTZ 17 TR 2100.
Absolute Maximum Ratings
Rating Value Units
Input Power Level 0 dBm
DC voltage 12 VDC
Storage Temperature -40 to +85 °C
Soldering Temperature (10 seconds / 5 cycles max.) 260 °C
433.420 MHz
SAW
Resonator
RO3112D
1. Frequency aging is the change in fC with time and is spec ified 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.
2. The center frequency, fC, is measured at the minimum insert ion loss point,
ILMIN, with the res onator in the 50 Ω test system (VSWR ≤ 1.2:1). The
shunt inductance, LTEST, is tuned for pa r allel resonance with CO at fC.
Typica lly, fOSCILLATOR or fTRANSMITTER is approximately equal to the
resonator fC.
3. One or more of the following United States patents apply: 4,454,48 8 and
4,616,197.
4. Typically, equipment utiliz ing this device requires emissi ons testing and
government app roval, which is the resp onsibility of the equipment
manufacturer.
5. Unless noted otherwise, case temperature TC= +25°C±2°C.
6. The design, manuf acturing process, an d sp ecifications 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 ver sus TC, and CO.
8. Turnover temperature, TO, is the tempera ture of maximum (or turnover)
frequenc y, fO. The nomina l frequenc y at an y case te mperature, TC, may be
calculated from: f = fO[1 - FTC (TO-TC)2]. Typ ically oscillator TO is
approximately equal to the specified resonator TO.
9. This equiv alent RLC model approximate s resonator performance near the
resonan t frequen cy and is provided for refer ence o nly. The capac itanc e CO
is the static (nonmotional) capacitance between the two terminals
measured at low frequency (10 MHz) with a capacitance meter. The
measureme nt includes p arasitic cap acitanc e with "NC” pads unconne cted.
Case pa r as itic capacitance is approximately 0.05 pF. Transducer parallel
capacitance can by calculated as: CP≈CO-0.05pF.
SM3838-6 Case
3.8 X 3.8
Pb
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©2008 by RF Monolithics, Inc. RO3112D - 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 eit her 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.
Electrical Test
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