Click Here to this file: /ro3156a

Click Here to this file: /ro3156a
RFM products are now
Murata products.
RO3156A-3
•
•
•
•
•
Ideal for European 868.95 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Surface-mount Ceramic Case
Complies with Directive 2002/95/EC (RoHS) P b
868.95 MHz
SAW Resonator
The RO3156A-3 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 868.95 MHz. This SAW is designed specifically for remote-control and wireless security
transmitters operating under ETSI IETS 300 220 in Europe.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation
+5
dBm
DC Voltage Between Terminals
±30
VDC
-40 to +85
°C
260
°C
Case Temperature
Soldering Temperature (10 seconds / 5 cycles maximum)
Characteristic
Sym
Insertion Loss
Temperature Stability
Frequency Aging
2,3,4,5
ΔfC
Tolerance from 868.95 MHz
Quality Factor
Notes
fC
Frequency at +25 °C
Unloaded Q
Typical
868.875
2,5,6
1.2
QU
5,6,7
7500
50 Ω Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
Maximum
Units
869.025
MHz
±75
kHz
2.0
dB
700
10
6,7,8
Frequency Temperature Coefficient
FTC
Absolute Value during the First Year
|fA|
1
5
Motional Resistance
RM
Motional Inductance
LM
Motional Capacitance
CM
Shunt Static Capacitance
CO
5, 6, 9
LTEST
2, 7
Test Fixture Shunt Inductance
Minimum
IL
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
SM5035-4
25
0.032
ppm/°C2
ppm/yr
1.0
Lid Symbolization (in addition to Lot and/or Date Codes)
°C
kHz
<±10
5, 6, 7, 9
40
fC
MΩ
10.2
Ω
14.0
µH
2.0
fF
2.1
pF
14.3
nH
808 // YWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
2.
3.
4.
5.
6.
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
©2010-2015 by Murata Electronics N.A., Inc.
RO3156A-3 (R) 2/5/15
7.
8.
9.
Page 1 of 2
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.
Turnover temperature, TO, is the temperature of maximum (or turnover)
frequency, fO. The nominal frequency at any case temperature, TC, may be
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.
www.murata.com
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
recommended to help reduce parasitic
capacitance in the circuit.
0.05 pF*
Case Ground
Case Ground
Terminal
Co = Cp + 0.05 pF
Cp
Terminal
Lm
Rm
*Case Parasitics
Cm
Temperature Characteristics
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
ELECTRICAL TEST
fC = f O , T C = T O
-50
-50
-100
-100
-150
-150
-200
0 +20 +40 +60 +80
-200
-80 -60 -40 -20
Case
ΔT = T C - T O ( °C )
To 50 Ω
Network Analyzer
From 50 Ω
Network Analyzer
0
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
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 )
1
A
POWER TEST
3
P
INCIDENT
50 Ω Source
P
at F C
REFLECTED
Low-Loss
Matching
Network to
50 Ω
2
Terminal
NC
NC
G
(1 x )
D
Terminal
H
CW RF Power Dissipation =
P INCIDENT - P REFLECTED
I
Typical Application Circuits
I
I
H
Typical Low-Power Transmitter Application
H
+9VDC
Modulation
Input
200k Ω
C1
J
H
K
47
L1
(Antenna)
L
PCB Land Pattern
Top View
C2
RF Bypass
RO3XXXA
Bottom View
Dimensions
470
Typical Local Oscillator Applications
Output
+VDC
C1
+VDC
L1
C2
RO3XXXA
Bottom View
©2010-2015 by Murata Electronics N.A., Inc.
RO3156A-3 (R) 2/5/15
RF Bypass
Page 2 of 2
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
-
0.50
-
-
0.019
-
K
-
1.05
-
-
0.041
-
L
-
1.44
-
-
0.057
-
M
-
0.71
-
-
0.028
-
www.murata.com
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement