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©2008 by RF Monolithics, Inc. RO3112C - 3/26/08
Electri cal 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 1.5 dB
Quality Factor Unloaded Q QU8700
50W Loaded Q QL920
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 Tw o Terminals 5 1.0 MΩ
RF Equivalent RLC Model Motional Resistance RM5, 7, 9 11.9 Ω
Motional Inductance LM37.9 µH
Motional Capacitance CM3.6 fF
Shunt Static Capacitance CO5, 6, 9 3.8 pF
Test Fixture Shunt Inductance LTEST 2, 7 35.4 nH
Lid Symbolization (in addition to Lot and/or Date Codes) 657 // 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 RO3112C is a true one-port, surface-acoustic-wave (SA W) resonator in a surface-mount, ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters
operating at 433.92 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
RO3112C
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 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 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 appl y: 4,454,488 and
4,616,197.
4. Typically, equip ment utilizing this device requires emissions testing and
government app roval, 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 mat hematically from one or more of the following directly
measured parameters: fC, IL, 3 dB bandwidth, fC versu s TC, and CO.
8. Turnover temperature, TO, is the temperature of maximu m (or turnover)
frequenc y, fO. The n ominal frequ ency at any case tempera ture, TC, ma y be
calculated from: f = fO[1 - FTC (TO-TC)2]. Typicall y oscillator TO is
approximately equal to the specifi ed resonator TO.
9. This equiv alent RLC model approximates resonator performance near the
resonan t frequen cy and is provided for refer ence o nly. The capac it ance 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 capaci tance is approximately 0.05 pF. Transducer parall el
capacitance can by calculated as: CP≈CO-0.05pF.
SM5050-8 Case
5 X 5
Pb
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©2008 by RF Monolithics, Inc. RO3112C - 3/26/08
7
6
54
1
2
3
8
From 50 Ω
Network Analyzer To 50 Ω
Network Analyzer
A
1
2
3
B
7
6
5
4
C
D7
6
5
4
E
F
G
1
2
3
88
Case Dimensions
Dimension mm Inches
Min Nom Max Min Nom Max
A4.8 5.0 5.2 0.189 0.197 0.205
B4.8 5.0 5.2 0.189 0.197 0.205
C1.7 0.067
D2.08 0.082
E1.17 0.046
F0.64 0.025
G2.39 2.54 2.69 0.094 0.100 0.106
-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
(f-foo
)/f(ppm)
0.05 pF*
0.05 pF
Cp
Co+
=
*Case Parasitics
Cp
Rm Lm Cm
Equivalent LC Model
Tempera ture Ch arac ter isti cs
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
5NC
6 Terminal
7NC
8NC
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 Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
Electri cal T est
7 6 5
4
1 2 3
8
Low-Loss
Matching
Network to
50 Ω
50 Ω Source
at FC
PINCIDENT
PREFLECTED
NC NC
NC
NC NC
NC
Typical Application Circuits
7 6 5
4
1 2 3
8
Modulation
Input
ROXXXXC
Bottom View
200k Ω
C1
L1
(Antenna)
47
+9VDC
C2
RF Bypass
470
Typical Low-Power Transmitter A pplication
7 6 5
4
1 2 3
8
+VDC
ROXXXXC
Bottom View
200k Ω
C1
L1
+VDC
C2
RF Bypass
Typical Local Oscillator Application Output