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©2008 by RF Monolithics, Inc. RO3101 - 3/26/08
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency (+25 °C) Absolute Frequency fC2, 3, 4, 5 433.845 433.995 MHz
Tolerance from 433.920 MHz ΔfC±75 kHz
Insertion Loss IL 2, 5, 6 1.5 2.0 dB
Quality Factor Unloaded Q QU5, 6, 7 7400
50 Ω Loaded Q QL900
Temperature Stability Turnover Temperature TO6, 7, 8
10 25 40 °C
Turnover Frequency fOfc + 2.7 kHz
Frequency Temperature Coefficient FTC 0.037 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA|1≤10 ppm/yr
DC Insulation Resistance between Any Two Pins 5 1.0 MΩ
RF Equivalent RLC Model Motional Resistance RM5, 7, 9
13.7 Ω
Motional Inductance LM37.1 µH
Motional Capacitance CM3.6 fF
Pin 1 to Pin 2 S tatic Capacitance CO5, 6, 9 2.7 pF
Transducer Static Capacitance CP5, 6, 7, 9 2.5 pF
Test Fixture Shunt Inductance LTEST 2, 7 50.0 nH
Lid Symbolization (in Addition to Lot and/or Date Codes) RFM RO3101
TO39-3 Case
• Ideal for 433.92 MHz Transmitters
• Very Low Series Resistance
• Quartz Stability
• Rugged, Hermetic, Low-Profile TO39 Case
• Complies with Directive 2002/95/EC (RoHS)
The RO3101 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It
provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating
at 433.92 MHz. The RO3101 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 +0 dBm
DC Voltage Between Any Two Pins ±30 VDC
Case Temperature -40 to +85 °C
Soldering Temperature (10 seconds / 5 cycles Max.) 260 °C
433.92 MHz
SAW
Resonator
RO3101
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 tempera tures
above +65°C. Typically, aging is greatest the first year after manufacture,
decreasing significantly in subsequent years .
2. The center frequency, fC, is measured at the minimum insertion loss poi nt,
ILMIN, with the res onator in the 50 Ω test system (VSWR ≤ 1.2:1). The
shunt inductance, LTEST, is tuned for paralle l resonance with CO at fC.
Typ ica lly, fOSCILLATOR or fTRANSMITTER is less than the resonator fC.
3. One or more of the following United State s patents appl y: 4,454,488 and
4,616,197 and others pending.
4. Typically, equipment designs utilizing this device require emissions testing
and government approval, which is the respo nsibility of the equipmen t
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 n ominal f requency at any case tempera ture, T C, may be
calculated from: f = fO[1 - FTC (TO-TC)2]. Typically, oscillator TO is 20°C
less than the specified resonator TO.
9. This equiv alent RLC model approximates reso nator performance near the
resonan t frequen cy and is provided for refer ence o nly. The ca pacit ance CO
is the static (nonmotional) capacitance bet ween pin1 and pin 2 meas ured
at low frequency (10 MHz) with a capacitance meter. The measurement
includes case parasi tic capacitance with a floating cas e. For usual
ground ed case ap plications (with ground connected to either pin 1 or pin 2
and to the case), add approximately 0.25 pF to CO.
Pb
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©2008 by RF Monolithics, Inc. RO3101 - 3/26/08
Electrical Connections
This one-port, two-terminal SAW resonator is bidirectional. The terminals
are interchangeable with the exception of circuit board layout.
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO at FC.
Typical Application Circuits
Temperature Characteristics
Equivalent LC Model
The following equivalent LC model is valid near resonance:
Case Design
Pin Connection
1 Terminal 1
2 Terminal 2
3 Case Ground
Network
Analyzer Network
Analyzer
Electri cal Test:
12
3
ΩΩ
50
Ω
Source at
F
C
Low-Loss
Matching
Network
50
Ω
to
Pow er Test:
P
P
INCIDENT
INCIDENT
CW RF Po wer Dis s i pation = -
REFLECTED
REFLECTED
P
P
3
2
MPS-H10
+9VDC
47
RF Bypass
L1
C1
C2
200k
Ω
Modulation
Input
ROXXXX
Botto m V iew
470
Typical Low -P ow er Transmitter A pp li cation:
1
2
3
(Antenna)
+VDC
RF Bypass
L1
C2
ROXXXX
Bottom View
Typical Local Oscillator Application:
12
3
Output
+VDC
C1
Dimensions Millimeters Inches
Min Max Min Max
A 9.40 0.370
B 3.18 0.125
C 2.50 3.50 0.098 0.138
D 0.46 Nominal 0.018 Nominal
E 5.08 Nominal 0.200 Nominal
F 2.54 Nominal 0.100 Nominal
G 2.54 Nominal 0.100 Nominal
H 1.02 0.040
J1.40 0.055
The curve shown on the right
accounts for resonator
contribution only and does not
include oscillator temperature
characteristics.
-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)
0.5 p F*
0.25 pF*
Cp
Co=+
*Case Parasitics
R
L
C
0.5 pF*
Cp
1
2
3
MMM
B
45°
J
(2 places)
D
(3 places)
H
G
EF
C
A
Bot to m View
Pin 1 Pin 2
Pin 3