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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 433.42 MHz ∆fC±75 kHz
Insertion Loss IL 2, 5, 6 1.4 1.6 dB
Quality Factor Unloaded Q QU5, 6, 7 8000
50 Ω Loaded Q QL1300
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 Motional Resistance RM5, 7, 9
18.6 25 Ω
Motional Inductance LM54.8 µH
Motional Capacitance CM2.5 fF
Trans ducer Static Capacitance CO5, 6, 9 3.7 pF
Test Fixture Shunt Inductance LTEST 2, 7 36.8 nH
Lid Symbolization 658 // YYWWS
• Ideal for European 433.92 MHz Superhet Receiver LOs
• Very Low Series Resistance
• Quartz Stability
• Surface-mount Ceramic Case with 21 mm2 Footprint
• Complies with Directive 2002/95/EC (RoHS)
The RO3112A 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 local oscillators operating at
approximately 433.42 MHz. This SAW is designed for 433.92 MHz superhet receivers with 500 kHz IF (Philips
UAA3201T). Applications include remote-control and wireless security receivers operating in Europe under
ETSI I-ETS 300 220.
Absolute Maximum Ratings
Rating Value Units
CW RF Power Dissipation (See Typical Test Circuit) +0 dBm
DC Voltage Between Terminals (Observe ESD Precautions) ±30 VDC
Case Temperature -40 to +85 °C
Soldering Temperature (10 seconds / 5 cycles maximum) 260 °C
433.42 MHz
SAW
Resonator
RO3112A
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 res onance with CO at fC.
Typi cally, fOSCILLATOR or fTRANSMITTER is approximately equal to the
resonator fC.
3. One or more of the following United Sta tes patents apply: 4,454,488 and
4,616,197.
4. Typically, equipment utilizing this dev ic e 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, manufact uring process, and specifications of t his 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 n ominal f requency at any ca se 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 performance near the
resonan t frequen cy and is provided for refer ence o nly. The capaci tanc e CO
is the static (nonmotional) capaci tance between the tw o terminals
measured at low frequenc y (10 MHz) with a c apacitance meter. The
measureme nt inclu des p arasiti c capa citan ce with “NC” p ads unconn ected.
Case pa r as itic capa citance is approximately 0.05 pF. Transducer parallel
capac itance can be calculated as: CP ≈ CO - 0.05 pF.
10. Packaged in 500PC Tape carrier.
SM5035-4
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© 2008-2011 by RF Monolithics, Inc. RO3112A - 6/27/11
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
I
H H
J
J
K
L
MM
PCB Land Pattern
Top View
