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RO3156A/A-1/A-2
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Designed for European 868.95 MHz SRD Transmitters
Very Low Series Resistance
Quartz Stability
Surface-mount Ceramic Case
Complies with Directive 2002/95/EC (RoHS)
Pb
868.95 MHz
SAW Resonator
The RO3156A is a one-port surface-acoustic-wave (SAW) resonator packaged in a surface-mount ceramic
case. It provides reliable, fundamental-mode quartz frequency stabilization of fixed-frequency transmitters
operating at 868.95 MHz. The RO3156A is designed specifically for SRD transmitters operating in Europe
under ETSI EN 300 220-2.
Absolute Maximum Ratings
Rating
CW RF Power Dissipation
DC Voltage Between Terminals
Case Temperature
Soldering Temperature, 10 seconds / 5 cycles maximum
Value
+5
±30
-40 to +85
260
Units
dBm
VDC
°C
°C
SM5035-4
Electrical Characteristics
Characteristic
Frequency, +25 °C
RO3156A
RO3156A-1
RO3156A-2
Tolerance from 868.95 MHz
RO3156A
RO3156A-1
RO3156A-2
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50
Ω
Loaded Q
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
RF Equivalent RLC Model
Absolute Value during the First Year
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
DC Insulation Resistance between Any Two Terminals
R
M
L
M
C
M
C
O
L
TEST
5, 6, 9
2, 7
5, 6, 7, 9
IL
Q
U
Q
L
T
O
f
O
FTC
|fA|
1
5
1.0
14.5
18.0
2.0
2.1
15.8
6,7,8
10
2,5,6
5,6,7
1.2
6200
850
25
f
C
0.032
<±10
40
°C
kHz
ppm/°C
2
ppm/yr
MΩ
Ω
µH
fF
pF
nH
Δf
C
f
C
2,3,4,5
Sym
Notes
Minimum
868.750
868.800
868.850
Typical
Maximum
869.150
869.100
869.050
±200
±150
±100
2.0
Units
MHz
kHz
dB
RO3156A: 714, RO3156A-1: 923, RO3156A-2 828, //YYWWS
©2010-2015 by Murata Electronics N.A., Inc.
RO3156A/A-1/A-2 (R) 2/5/15
Page 1 of 3
www.murata.com
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
Frequency aging is the change in f
C
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 subse-
quent years.
The center frequency, f
C
, is measured at the minimum insertion loss point, IL
MIN
,
with the resonator in the 50
Ω
test system (VSWR
≤
1.2:1). The shunt
inductance, L
TEST
, is tuned for parallel resonance with C
O
at f
C
. Typically,
f
OSCILLATOR
or f
TRANSMITTER
is approximately equal to the resonator f
C
.
One or more of the following United States patents apply: 4,454,488 and
4,616,197.
Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature T
C
= +25 ± 2 °C.
6.
7.
8.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
Derived mathematically from one or more of the following directly measured
parameters: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
Turnover temperature, T
O
, is the temperature of maximum (or turnover)
frequency, f
O
. The nominal frequency at any case temperature, T
C
, may be
calculated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
]. Typically
oscillator
T
O
is
approximately equal to the specified
resonator
T
O
.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance C
O
is
the static (nonmotional) capacitance between the two terminals measured at low
frequency (10 MHz) with a capacitance meter. The measurement includes
parasitic capacitance with "NC” pads unconnected. Case parasitic capacitance
is approximately 0.05 pF. Transducer parallel capacitance can by calculated as:
C
P
≈
C
O
- 0.05 pF.
2.
3.
4.
5.
9.
Electrical Connections
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
recommended to help reduce parasitic
capacitance in the circuit.
Terminal
Case Ground
Case Ground
Equivalent RLC Model
C
P
C
C
P
S
O
C
S
C
= 0 .0 5 p F (C a s e P a r a s itic s )
= S A W S ta tic C a p a c ita n c e
= C
S
+ C
P
Terminal
L
M
C
M
R
M
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static
capacitance, C
O
, at F
C
.
Temperature Characteristics
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
f
C
= f
O
, T
C
= T
O
0
(f-fo ) / fo (ppm)
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-50
-100
ELECTRICAL TEST
From 50
Ω
Network Analyzer
To 50
Ω
Network Analyzer
-150
-200
-80 -60 -40 -20
Case
T o p V ie w
B
Δ
T = T
C
- T
O
( °C )
S id e V ie w
C
B o tto m
V ie w
E (3 x )
4
POWER TEST
1
A
Terminal
NC
NC
Terminal
P
INCIDENT
F (4 x )
50
Ω
Source
P
at F
C
REFLECTED
Low-Loss
Matching
Network to
50
Ω
3
2
G
(1 x )
D
CW RF Power Dissipation =
P INCIDENT - P REFLECTED
H
I
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation
Input
200k
Ω
C1
47
L1
(Antenna)
H
K
L
H
I
I
H
J
C2
RO3XXXA
Bottom View
470
RF Bypass
PCB Land Pattern
Top View
©2010-2015 by Murata Electronics N.A., Inc.
RO3156A/A-1/A-2 (R) 2/5/15
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www.murata.com
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