RO3104A [MURATA]
303.825 MHz SAW Resonator;
muRata 
RO3104A
• Ideal for 303.825 MHz Transmitters
• Very Low Series Resistance
• Quartz Stability
• Surface-mount Ceramic Case
• Complies with Directive 2002/95/EC (RoHS)
303.825 MHz
SAW
Pb
Resonator
The RO3104A 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 303.825 MHz. This SAW is designed specifically for AM transmitters in wireless security and
remote control applications.
Absolute Maximum Ratings
Rating
Value
0
Units
dBm
VDC
°C
CW RF Power Dissipation (See Typical Test Circuit)
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature
±30
-40 to +85
260
Soldering Temperature (10 seconds / 5 cycles maximum)
°C
SM5035-4 Case
Electrical Characteristics
Characteristic
Sym
Notes
2, 3, 4, 5
2, 5, 6
Minimum
Typical
Maximum
303.900
±75
Units
f
Frequency, +25 °C
Nominal Frequency
303.750
MHz
kHz
dB
C
∆f
Tolerance from 303.825 MHz
C
Insertion Loss
Quality Factor
IL
1.5
11,000
1,460
25
2.0
Q
Unloaded Q
U
5, 6, 7
Q
T
50 Ω Loaded Q
L
Temperature Stability
Turnover Temperature
Turnover Frequency
10
40
°C
O
f
f
6, 7, 8
O
C
2
Frequency Temperature Coefficient
Absolute Value during the First Year
FTC
0.032
10
ppm/°C
|f |
Frequency Aging
1, 6
5
ppm/yr
MΩ
Ω
A
DC Insulation Resistance between Any Two Terminals
1.0
R
RF Equivalent RLC Model
Motional Resistance
15.4
88.4
3.1
M
5, 6, 7,
9,
L
Motional Inductance
µH
M
C
Motional Capacitance
Transducer Static Capacitance
fF
M
C
5, 6, 9
2, 7
3.3
pF
O
L
Test Fixture Shunt Inductance
Lid Symbolization
82
nH
TEST
662 // YWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
Frequency aging is the change in f with time and is specified at +65 °C or
C
7.
8.
Derived mathematically from one or more of the following directly
measured parameters: f , IL, 3 dB bandwidth, f versus T , and C .
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.
C
C
C
O
Turnover temperature, T , is the temperature of maximum (or turnover)
O
frequency, f . The nominal frequency at any case temperature, T , may be
O
C
The center frequency, f , is measured at the minimum insertion loss point,
C
2
calculated from: f = f [1 - FTC (T -T ) ]. Typically oscillator T is
O
O
C
O
IL , with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The
MIN
approximately equal to the specified resonator T .
O
shunt inductance, L
, is tuned for parallel resonance with C at f .
TEST
O C
9.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance C
is the static (nonmotional) capacitance between the two terminals
measured at low frequency (10 MHz) with a capacitance meter. The
Typically, f
or f
is approximately equal to the
TRANSMITTER
OSCILLATOR
O
resonator f .
C
3.
4.
One or more of the following United States patents apply: 4,454,488 and
4,616,197.
measurement includes parasitic capacitance with "NC” pads unconnected.
Case parasitic capacitance is approximately 0.05 pF. Transducer parallel
capacitance can by calculated as: C ≈ C - 0.05 pF.
Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment
manufacturer.
P
O
10. Tape and Reel standard per ANSI / EIA 481.
5.
6.
Unless noted otherwise, case temperature T = +25 ± 2 °C.
C
The design, manufacturing process, and specifications of this device are
subject to change without notice.
www.RFM.com E-mail: info@rfm.com
© 2009-2011 by RF Monolithics, Inc.
Page 1 of 2
RO3104A - 6/28/11
Electrical Connections
Equivalent Model
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
0.05 pF*
Terminal
+
C
=
C
o
0.05 pF
p
C
p
*Case Parasitics
Terminal
Lm
C m
Rm
recommended to help reduce parasitic
capacitance in the circuit.
Temperature Characteristics
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
fC = fO , TC = TO
Typical Test Circuit
0
0
The test circuit inductor, L
, is tuned to resonate with the static
TEST
-50
-50
capacitance, C , at F .
O
C
-100
-150
-100
-150
-200
temperature contributions.
-200
ELECTRICAL TEST
-80 -60 -40 -20
0
+40 +60 +80
+20
Case
T = TC - TO ( °C )
∆
Ω
Ω
To 50
Network Analyzer
From 50
Network Analyzer
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
B
C
E
(
3
x
)
4
F
(
4
x
)
1
POWER TEST
3
P
INCIDENT
2
Terminal
NC
Terminal
Low-Loss
Matching
Network to
G
(
1
x
)
Ω
50 Source
NC
P
at FC
REFLECTED
D
Ω
50
H
K
P
P
INCIDENT - REFLECTED
CW RF Power Dissipation =
I
Typical Application Circuits
J
Typical Low-Power Transmitter Application
+9VDC
L
Ω
200k
Modulation
Input
47
C1
C2
M
H
M
H
J
L1
(Antenna)
PCB Land Pattern
Top View
RF Bypass
RO3XXXA
Bottom View
Millimeters
Nom
5.00
Inches
Nom
Dimensions
Min
Max
5.13
3.63
1.60
1.50
0.93
0.63
1.33
-
Min
Max
470
A
B
C
D
E
F
G
H
I
4.87
0.191
0.196
0.137
0.060
0.057
0.031
0.019
0.047
0.041
0.058
0.019
0.041
0.057
0.028
0.201
3.37
3.50
0.132
0.142
Typical Local Oscillator Applications
1.45
1.53
0.057
0.062
1.35
1.43
0.040
0.059
Output
0.67
0.80
0.026
0.036
+VDC
0.37
0.50
0.014
0.024
C1
+VDC
1.07
1.20
0.042
0.052
L1
-
-
-
-
-
-
1.04
-
-
-
-
-
-
-
-
-
-
-
-
1.46
-
C2
J
0.50
-
RO3XXXA
Bottom View
RF Bypass
K
L
1.05
-
1.44
-
M
0.71
-
www.RFM.com E-mail: info@rfm.com
© 2009-2011 by RF Monolithics, Inc.
Page 2 of 2
RO3104A - 6/28/11
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