•
•
•
•
Ideal for 868.95 MHz FCC Part 15 Transmitters
Very Low Series Resistance
Quartz Stability
Complies with Directive 2002/95/EC (RoHS)
RO3156D
RO3156D-1
RO3156D-2
Pb
The RO3156D is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode stabilization of fixed-frequency transmitters operating at 868.95 MHz.
This SAW is designed specifically for remote-control and data-link transmitters operating in the under ETSI
EN 300 220 regulations.
868.95 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
Input Power Level
DC Voltage
Storage Temperature
Soldering Temperature, 10 seconds / 5 cycles maximum
Value
10
12
-40 to +85
260
Units
dBm
VDC
°C
°C
SM3838-6 Case
3.8 X 3.8
Electrical Characteristics
Characteristic
Frequency, +25 °C
RO3156D
RO3156D-1
RO3156D-2
Tolerance from 916.5 MH
RO3156D
RO3156D-1
RO3156D-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
Transducer Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
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
15.7
18.1
1.85
2.2
15.2
500 Pieces / Reel
3000 Pieces / Reel
6, 7, 8
2, 5, 6
5, 6, 7
10
1.20
6300
850
25
fc
0.032
10
40
°C
MHz
ppm/°C
2
ppm
MΩ
Ω
µH
fF
pF
nH
∆f
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
2.5
Units
MHz
kHz
dB
RO3156D: 715, RO3156D-1: 924, RO3156D-2: 925 //YWWS
10
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°C±2°C.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
7.
8.
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.
Tape and Reel Standard Per ANSI/EIA 481.
2.
9.
3.
4.
5.
6.
10.
www.RFM.com E-mail: info@rfm.com
©2009 by RF Monolithics, Inc.
Page 1 of 2
RO3156D - 7/30/09
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.
B
1
6
C
Power Test
Pin
1
2
3
4
5
6
Connection
NC
Terminal
NC
NC
Terminal
NC
50
Ω
Source
at F
C
P
INCIDENT
P
REFLECTED
Low-Loss
Matching
Network to
50
Ω
1
6
2
3
5
4
G
H
Typical Application Circuits
1
Modulation
Input
6
Typical Low-Power Transmitter Application
200k
Ω
+9VDC
C1
L1
47
A 2
5
E
5
2
I
4
3
4
3
2
3
(Antenna)
1
D
J
6
5
4
C2
ROXXXXC
Bottom View
RF Bypass
470
Case Dimensions
Typical Local Oscillator Application
Output
Dimension
Min
A
B
C
D
E
G
H
I
J
3.60
3.60
1.00
0.95
2.39
0.90
1.90
0.50
1.70
mm
Nom
3.80
3.80
1.20
1.10
2.54
1.0
2.0
0.6
1.8
Inches
Max
4.0
4.0
1.40
1.25
2.69
1.10
2.10
0.70
1.90
200k
Ω
Min
0.14
0.14
0.04
0.033
0.090
0.035
0.75
0.020
0.067
Nom
0.15
0.15
0.05
0.043
0.10
0.04
0.08
0.024
0.07
Max
0.16
0.16
0.055
0.05
0.110
0.043
0.83
0.028
0.075
+VDC
C1
L1
+VDC
1
6
2
3
5
4
C2
ROXXXXC
Bottom View
RF Bypass
Equivalent LC Model
0.05 pF*
Co = Cp + 0.05 pF
Cp
*Case Parasitics
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static
capacitance, C
O
, at F
C
.
Electrical Test
Rm
Lm
Cm
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions.
6
1
f
C
= f
O
, T
C
= T
O
0
(f-fo ) / fo (ppm)
To 50
Ω
Network Analyzer
0
-50
-100
-150
-200
0 +20 +40 +60 +80
From 50
Ω
Network Analyzer
5
2
-50
4
3
-100
-150
-200
-80 -60 -40 -20
∆
T = T
C
- T
O
( °C )
www.RFM.com E-mail: info@rfm.com
©2009 by RF Monolithics, Inc.
Page 2 of 2
RO3156D - 7/30/09
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