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RO3188A
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Designed for 390.0 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Surface-mount Ceramic Case
Complies with Directive 2002/95/EC (RoHS)
390.0 MHz
SAW Resonator
Pb
The RO3188A 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 390.0 MHz.
Absolute Maximum Ratings
Rating
Value
CW RF Power Dissipation (See: Typical Test Circuit)
DC voltage Between Terminals (Observe ESD Precautions)
Case Temperature
Quality Factor
Temperature Stability
Frequency Aging
5,6,7
Unloaded Q
QU
QL
Turnover Temperature
TO
Turnover Frequency
fO
Frequency Temperature Coefficient
FTC
Absolute Value during the First Year
|fA|
Minimum
1.3
LM
CM
Shunt Static Capacitance
CO
LTEST
Maximum
Units
390.100
MHz
±100
kHz
2.0
dB
40
°C
12647
1532
6,7,8
25
fC
0.032
≤10
1
1.0
RM
Motional Inductance
Typical
389.900
10
5
Motional Capacitance
Test Fixture Shunt Inductance
2,3,4,5
2,5,6
50 Ω Loaded Q
Motional Resistance
Notes
IL
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
VDC
°C
ΔfC
Insertion Loss
±30
°C
fC
Tolerance from 390.0 MHz
dBm
260
Sym
Center Frequency, +25 °C
+0
-40 to +85
Soldering Temperature (10 seconds / 5 cycles maximum)
Characteristic
SM5035-4
Units
5, 7, 9
ppm/°C2
ppm/yr
MΩ
13.8
Ω
71.2
µH
2.3
fF
5, 6, 9
3.0
pF
2, 7
55
nH
Lid Symbolization (in addition to Lot and/or Date Codes)
797 // YYWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
©2010-2015 by Murata Electronics N.A., Inc.
RO3188A (R) 2/10/15
Page 1 of 3
www.murata.com
NOTES:
1.
2.
3.
4.
5.
6.
7.
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.
The center frequency, fC, is measured at the minimum insertion loss point, ILMIN,
with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The shunt
inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically,
fOSCILLATOR or fTRANSMITTER is approximately equal to the resonator fC.
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 TC = +25 ± 2 °C.
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: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8.
Turnover temperature, TO, is the temperature of maximum (or turnover)
frequency, fO. The nominal frequency at any case temperature, TC, may be
9.
10.
calculated from: f = fO [1 - FTC (TO -TC)2]. Typically oscillator TO is
approximately equal to the specified resonator TO.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance CO 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:
CP ≈ CO - 0.05 pF.
Tape and Reel standard per ANSI / EIA 481.
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.
Typical Local Oscillator Applications
Terminal
Case Ground
Case Ground
Output
+VDC
C1
+VDC
Terminal
L1
C2
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
RO3XXXA
Bottom View
RF Bypass
Equivalent RLC Model
ELECTRICAL TEST
C
To 50 Ω
Network Analyzer
From 50 Ω
Network Analyzer
P
L
M
C
P
C
C
C
C
S
R
M
S
O
= 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
M
Temperature Characteristics
POWER TEST
P
INCIDENT
50 Ω Source
P
at F C
REFLECTED
CW RF Power Dissipation =
Low-Loss
Matching
Network to
50 Ω
Terminal
0
-50
-50
-100
-100
-150
-150
-200
-80 -60 -40 -20
NC
NC
fC = f O , T C = T O
0
(f-fo ) / fo (ppm)
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
-200
0 +20 +40 +60 +80
ΔT = TC - T O ( °C )
Terminal
P INCIDENT - P REFLECTED
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation
Input
200k Ω
C1
47
L1
(Antenna)
C2
RF Bypass
RO3XXXA
Bottom View
470
©2010-2015 by Murata Electronics N.A., Inc.
RO3188A (R) 2/10/15
Page 2 of 3
www.murata.com
Case
T o p V ie w
S id e V ie w
B
C
B o tto m
V ie w
E (3 x )
4
F (4 x )
A
1
3
2
G
(1 x )
D
H
I
I
I
H
H
J
H
K
L
PCB Land Pattern
Top View
Dimensions
Millimeters
Min
Nom
Inches
Max
Min
Nom
Max
A
4.87
5.00
5.13
0.191
0.196
B
3.37
3.50
3.63
0.132
0.137
0.201
0.142
C
1.45
1.53
1.60
0.057
0.060
0.062
D
1.35
1.43
1.50
0.040
0.057
0.059
E
0.67
0.80
0.93
0.026
0.031
0.036
F
0.37
0.50
0.63
0.014
0.019
0.024
G
1.07
1.20
1.33
0.042
0.047
0.052
H
-
1.04
-
-
0.041
-
I
-
1.46
-
-
0.058
-
J
-
3.01
-
-
0.119
-
K
-
1.44
-
-
0.057
-
L
-
1.92
-
-
0.076
-
©2010-2015 by Murata Electronics N.A., Inc.
RO3188A (R) 2/10/15
Page 3 of 3
www.murata.com
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