RO3073
Ideal for 315.0 MHz Transmitters
Low Series Resistance
315.0 MHz
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
Pb
SAW
Complies with Directive 2002/95/EC (RoHS)
Resonator
The RO3073 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 315 MHz. The RO3073 is designed specifically for wireless remote controls and security transmitters,
typically for automotive-keyless-entry, operating in the USA under FCC Part 15, in Canada under DoC RSS-
210, and in Italy.
Absolute Maximum Ratings
Rating Value Units
CW RF Power Dissipation (See Typical Test Circuit)
+0 dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions)
30 VDC
Case Temperature -40 to +85 C
Soldering Temperature (10 seconds/5 cycles Max) 260 C
TO39-3 Case
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency (+25 C) Absolute Frequency f 314.925 315.075 MHz
C
2, 3, 4, 5
Tolerance from 315.000 MHz f 75 kHz
C
Insertion Loss IL 2, 5, 6 1.5 2.2 dB
Quality Factor Unloaded Q Q 7800
U
5, 6, 7
50 Loaded Q Q 1100
L
Temperature Stability Turnover Temperature T 10 25 40 C
O
Turnover Frequency f 6, 7, 8 f kHz
O c
2
Frequency Temperature Coefficient FTC 0.037
ppm/C
Frequency Aging Absolute Value during the First Year |f | 10 ppm/yr
1
A
DC Insulation Resistance between Any Two Pins 5 1.0 M
RF Equivalent RLC Model Motional Resistance R 16
M
Motional Inductance L 63 H
5, 7, 9
M
Motional Capacitance C 4.1
fF
M
Pin 1 to Pin 2 Static Capacitance C 5, 6, 9 3.6 pF
O
Transducer Static Capacitance C 5, 6, 7, 9 3.6 pF
P
Test Fixture Shunt Inductance L 2, 7 65.7
nH
TEST
Lid Symbolization (in Addition to Lot and/or Date Codes) RFM RO3073
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1. Frequency aging is the change in f with time and is specified at +65C or subject to change without notice.
C
7. Derived mathematically from one or more of the following directly
less. Aging may exceed the specification for prolonged temperatures
measured parameters: f , IL, 3 dB bandwidth, f versus T , and C .
above +65C. Typically, aging is greatest the first year after manufacture,
C C C O
decreasing significantly in subsequent years. 8. Turnover temperature, T , is the temperature of maximum (or turnover)
O
2. The center frequency, f , is measured at the minimum insertion loss point,
C frequency, f . The nominal frequency at any case temperature, T , may be
O C
IL , with the resonator in the 50 test system (VSWR 1.2:1). The
2
MIN
calculated from: f = f [1 - FTC (T -T ) ]. Typically, oscillator T is 20C
O O C O
shunt inductance, L , is tuned for parallel resonance with C at f .
TEST O C
less than the specified resonator T .
O
Typically, f or f is less than the resonator f .
OSCILLATOR TRANSMITTER C
9. This equivalent RLC model approximates resonator performance near the
3. One or more of the following United States patents apply: 4,454,488 and
resonant frequency and is provided for reference only. The capacitance C
O
4,616,197 and others pending.
is the static (nonmotional) capacitance between pin1 and pin 2 measured
4. Typically, equipment designs utilizing this device require emissions testing
at low frequency (10 MHz) with a capacitance meter. The measurement
and government approval, which is the responsibility of the equipment
includes case parasitic capacitance with a floating case. For usual
manufacturer.
grounded case applications (with ground connected to either pin 1 or pin 2
5. Unless noted otherwise, case temperature T = +25C2C.
C
and to the case), add approximately 0.25 pF to C .
O
6. The design, manufacturing process, and specifications of this device are
Copyright Murata Manufacturing Co., Ltd. All Rights Reserved. 2010
RO370310/05/16 1 of 2 www.murata.comElectrical Connections Temperature Characteristics
This one-port, two-terminal SAW resonator is bidirectional. The terminals
The curve shown on the right f = f , T = T
C O C O
are interchangeable with the exception of circuit board layout.
0 0
accounts for resonator
-50
Pin Connection contribution only and does not -50
include oscillator temperature
-100 -100
Bottom View
1Terminal 1
characteristics.
-150
-150
2Terminal 2
Pin 1
Pin 2
-200
3 Case Ground -200
-80 -60 -40 -20 0 +20 +40 +60 +80
Pin 3
T = T - T ( C )
C O
Typical Test Circuit
The test circuit inductor, L , is tuned to resonate with the static
TEST
capacitance, C at F .
O C
Equivalent LC Model
The following equivalent LC model is valid near resonance:
Electrical Test:
1 2
2
1
Network Network
Analyzer Analyzer
C =C +0.25 pF*
o p
C
p
3
*Case Parasitics
R L C
MM M
0.5 pF*
0.5 pF*
Power Test:
3
1
P
INCIDENT
Low-Loss
50
Case Design
Matching
Source at
P
REFLECTED
Network
F
C
to 50 3
C
G
2
B
-
CW RF Power Dissipation = P P
INCIDENT H
REFLECTED
F
E
A
Typical Application Circuits
D
(3 places)
Typical Low-Power Transmitter Application:
J
200k
(2 places)
MPS-H10
45
Modulation
+9VDC
Input
47
C1
L1
1
2 (Antenna)
Millimeters Inches
Dimensions
C2
Min Max Min Max
ROXXXX
3
RF Bypass
Bottom View
A 9.40 0.370
470
B 3.18 0.125
C 2.50 3.50 0.098 0.138
D 0.46 Nominal 0.018 Nominal
Typical Local Oscillator Application:
E 5.08 Nominal 0.200 Nominal
Output
+VDC F 2.54 Nominal 0.100 Nominal
C1
G 2.54 Nominal 0.100 Nominal
L1
+VDC
1
2
H 1.02 0.040
J 1.40 0.055
C2
ROXXXX
3
Bottom View RF Bypass
Copyright Murata Manufacturing Co., Ltd. All Rights Reserved. 2010
RO370310/05/16 2 of 2 www.murata.com
f (ppm)
(f-f )
o / o