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Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency (+25 °C) Absolute Frequency fC2,3,4,5 311.925 312.075 MHz
Tolerance from 312.0 MHz ΔfC±75 kHz
Insertion Loss IL 2,5,6 1.4 2.2 dB
Quality Factor Unloaded Q QU5,6,7 13500
50 Ω Loaded Q QL2000
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 17.4 Ω
Motional Inductance LM120 µH
Motional Capacitance CM2.2 fF
Shunt Static Capacitance CO5, 6, 9 .74 pF
Test Fixture Shunt Inductance LTEST 2, 7 351 nH
Lid Symbolization (in addition to Lot and/or Date Codes) 794 // YWWS
• Ideal for European 312.0 MHz Transmitters
• Very Low Series Resistance
• Quartz Stability
• Surface-Mount Ceramic Case
• Complies with Directive 2002/95/EC (RoHS)
The RO3132A is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters
operating at 312.0 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
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 max.) 260 °C
312.0 MHz
SAW
Resonator
RO3132A
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 t he 50 Ω test system (VSWR ≤ 1.2:1). The
shunt inductance, LTEST, is tuned for pa rallel resonance with CO at fC.
Typ ica lly, fOSCILLATOR or fTRANSMITTER is approximately equal to the
resonator fC.
3. One or more of the foll owing United States patents apply: 4,454,488 and
4,616,197.
4. Typically, equipment utilizing this device requires emissions tes ting 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, manufact uring process, and specifications of this device are
subject to change without notice.
7. Derived mat hematicall y fr om one or more of the follo wing 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 nomina l frequenc y at an y case te mperature, TC, may be
calculated from: f = fO[1 - FTC (TO-TC)2]. Typically oscillator TO is
approximately equal to the spec ified resonator TO.
9. This equiv alent RLC model approximates resonator performance near t he
resonan t frequen cy and is provided for refer ence o nly. The ca pacit ance CO
is the static (nonmotional) capacitance bet ween 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 capa citance is approximately 0.05 pF. Trans ducer pa rallel
capacitance can by calculated as: CP≈CO-0.05pF.
10. Tape and Reel standard per ANSI / EIA 481.
SM5035-4
Pb
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©2008 by RF Monolithics, Inc. RO3132A - 3/27/08
Electrical Con nections
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 LC Model
Temperature Characteristics
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
Typical Circuit Board
Land Pattern
The circuit board land pattern
shown below is one possible design. The optimum land pattern is
dependent on the circuit board assembly process which varies by
manufacturer. The distance between adjacent land edges should be at a
maximum to minimize parasitic capacit ance. Trace lengths from terminal
lands to other components should be short and wide to minimize parasitic
series inductances.
Case Design
Terminal
Terminal
Case Ground
Case Ground
ELECTRICAL TEST
From 50 Ω
Network Analyzer To 50 Ω
Networ k Analyzer
50 Ω Source
at FCREFLECTED
INCIDENT
P
P
Low-Loss
Matching
Network to
50 Ω
Terminal
Terminal
NC NC
POWER TEST
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 5.0 5.13 .191 .196 .201
B 3.37 3.5 3.63 .132 .137 .142
C 1.45 1.53 1.60 .057 .060 .062
D 1.35 1.43 1.50 .040 .057 .059
E .67 .80 .93 .026 .031 .036
F .37 .50 .63 .014 .019 .024
G 1.07 1.20 1.33 .042 .047 .052
0.05 pF*
0.05 pF
Cp
Co+
=
*Case Parasitics
Cp
Rm Lm Cm
-80 -60 -40 -20 0 +20 +40 +60
0
-50
+80
0
-50
-100
-150
-200
f
C
= f
O
, T
C
= T
O
Δ
T = T
C
- T
O
( °C )
(f-foo
)/f(ppm)
Typical Dimensio n:
0.010 t o 0.047 inch
(0.25 to 1. 20 m m)
(4 Places)
A
B C
D
E (3x)
F (4x)
G (1x)
Top View Side View Bottom View
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2
3
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