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©2009 by RF Monolithics, Inc. RO3156D - 7/30/09
Electrical Character istics
Characteristic Sym Notes Minimum Typical Maximum Units
Frequency, +25 °C RO3156D fC
2, 3, 4, 5
868.750 869.150 MHzRO3156D-1 868.800 869.100
RO3156D-2 868.850 869.050
Tolerance from 916.5 MH RO3156D
∆fC
±200 kHzRO3156D-1 ±150
RO3156D-2 ±100
Insertion Loss IL 2, 5, 6 1.20 2.5 dB
Quality Factor Unloaded Q QU5, 6, 7 6300
50 Ω Loaded Q QL850
Temperature Stability Turnover Temperature TO6, 7, 8 10 25 40 °C
Turnover Frequency fOfc MHz
Frequency Temperature Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 1 10 ppm
DC Insulation Resistance between Any Two Terminals 5 1.0 MΩ
RF Equivalent RLC Model Motional Resistance RM5, 6, 7, 9 15.7 Ω
Motional Inductance LM18.1 µH
Motional Capacitance CM1.85 fF
Transducer Static Capacitance CO5, 6, 9 2.2 pF
Test Fixture Shunt Inductance LTEST 2, 7 15.2 nH
Lid Symbolization RO3156D: 715, RO3156D-1: 924, RO3156D-2: 925 //YWWS
Standard Reel Quantity Reel Size 7 Inch 10 500 Pieces / Reel
Reel Size 13 Inch 3000 Pieces / Reel
• Ideal for 868.95 MHz FCC Part 15 Transmitters
• Very Low Series Resistance
• Quartz Stability
• Complies with Directive 2002/95/EC (RoHS)
The RO3156D is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode stabilizat ion 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.
Absolute Maximum Ratings
Rating Value Units
Input Power Level 10 dBm
DC Voltage 12 VDC
Storage Temperature -40 to +85 °C
Soldering Temperature, 10 seconds / 5 cycles maximum 260 °C
868.95 MHz
SAW
Resonator
RO3156D
RO3156D-1
RO3156D-2
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. 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 subse-
quent years.
2. The center frequency , fC, is measured at the minimum insertion loss point, ILMIN,
wit h the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The s hunt
inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically,
fOSCILLATOR or fTRANSMITTER is approximately equal to the resonator fC.
3. One or more of the following United States patents apply: 4,454,488 and
4,616,197.
4. Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment manufacturer.
5. Unless noted otherwise, case temperature TC= +25°C±2°C.
6. The design, manufacturing process, and specifications of this device are subject
to change without notice.
7. 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
calculat ed fro m: f = fO[1 - FTC (TO-TC)2]. Typically oscillator TO is
approximately equal to the specified resonator TO.
9. 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-0.05pF.
10. Tape and Reel Standard Per ANSI/EIA 481.
SM3838-6 Case
3.8 X 3.8
Pb
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©2009 by RF Monolithics, Inc. RO3156D - 7/30/09
-80 -60 -40 -20 0 +20 +40 +60
0
-50
-
100
-
150
+80
-
200
0
-50
-100
-150
-200
f
C
= f
O
, T
C
= T
O
∆
T = T
C
- T
O
( °C )
(f-foo
)/f(ppm)
0.05 pF*
0.05 pF
Cp
Co+
=
*Case Parasitics
Cp
Rm
Lm Cm
Equivalent LC Model
Tempera ture Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions.
Pin Connection
1NC
2 Terminal
3NC
4NC
5 Terminal
6NC
Power Test
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 Tes t Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
Electri cal Tes t
Typical Application Circuits
From 50 Ω
Network Analyzer To 50 Ω
Network Analyzer
2
3
6
5
4
1
Low-Loss
Matching
Network to
50 Ω
50 Ω Source
at FC
PINCIDENT
PREFLECTED
2 3
6 5 4
1
Modulation
Input
ROXXXXC
Bottom View
200k Ω
C1
L1
(Antenna)
47
+9VDC
C2
RF Bypass
470
Typical Low-Power Transm itt er Application
2 3
6 5 4
1
+VDC
ROXXXXC
Bottom View
200k Ω
C1
L1
+VDC
C2
RF Bypass
Typica l Local Oscillator Application Output
2 3
6 5 4
1
Case Dimensions
Dimension mm Inches
Min Nom Max Min Nom Max
A3.60 3.80 4.0 0.14 0.15 0.16
B3.60 3.80 4.0 0.14 0.15 0.16
C1.00 1.20 1.40 0.04 0.05 0.055
D0.95 1.10 1.25 0.033 0.043 0.05
E2.39 2.54 2.69 0.090 0.10 0.110
G0.90 1.0 1.10 0.035 0.04 0.043
H1.90 2.0 2.10 0.75 0.08 0.83
I0.50 0.6 0.70 0.020 0.024 0.028
J1.70 1.8 1.90 0.067 0.07 0.075
1
2
3
6
5
4
1
2
3
6
5
4
A
BC
DJ
E
GH
I
