RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 1 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RO2156D_RO2156D-1_RO2156D-2 _090503
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Frequency at +25C Nominal Frequency RO2156D
f
C
2,3,4,5
868.875
869.025
MHz
RO2156D-1
868.875
869.175
RO2156D-2
868.850
869.050
Tolerance from 868.95 MHz RO2156D
f
C
75
kHz
RO2156D-1
-75
+225
RO2156D-2
100
Insertion Loss
IL
2,5,6
1.1
2.0
dB
Quality Factor
Unloaded Q
Q
U
5,6,7
20,000
50
Loaded Q
Q
L
2,400
Temperature Stability
Turnover Temperature
T
O
6,7,8
10
25
40
C
Turnover Frequency
f
O
f
C
kHz
Frequency Temperature Coefficient
FTC
0.032
ppm/C
2
Frequency Aging
Absolute Value during the First Year
|fA|
1
<10
ppm/yr
DC Insulation Resistance between Any Two Terminals
5
1.0
M
RF Equivalent RLC Model
Motional Resistance
R
M
5, 6, 7, 9
15
Motional Inductance
L
M
50
H
Motional Capacitance
C
M
0.7
fF
Shunt Static Capacitance
C
O
5, 6, 7, 9
2.3
pF
Lid Symbolization (in Addition to Lot and/ or Date Code)
433 / YWWD
Standard Reel Quanitity
3000 Pieces / Reel
Ideal for European 868.95 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Complies with Directive 2002/95/EC (RoHS)
The RO2156D 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 operat-
ing at 868.95 MHz. This SAW is designed specifically for remote-control and wireless security transmitters
operating under ETSI-ETS 300 220 in Europe and under FTZ 17 TR 2100 in Germany.
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 max.)
260
C
868.95 MHz
SAW
Resonator
RO2156D
RO2156D-1
RO2156D-2
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
Lifetime (10 year) frequency aging.
2.
The center frequency, f
C
, is measured at the minimum insertion loss point,
IL
MIN
, with the resonator in the 50
test system (VSWR
1.2:1). The shunt
inductance, L
TEST
, is tuned for parallel resonance with C
O
at f
C
.
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 gov-
ernment approval, which is the responsibility of the equipment manufacturer.
5.
Unless noted otherwise, case temperature T
C
= +25C2C for all specifica-
tions.
6.
The design, manufacturing process, and specifications of this device are sub-
ject to change without notice.
7.
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
.
8.
Turnover temperature, T
O
, is the temperature of maximum (or turnover) fre-
quency, f
O
. The nominal frequency at any case temperature, T
C
, may be cal-
culated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
].
9.
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 0.05pF. Transducer parallel capacitance can be
calculated as: C
P
C
-
0.05 pF.
SM3838-6 Case
3.8 X 3.8
Pb
868.95 MHz SAW Resonator
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 2 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RO2156D_RO2156D-1_RO2156D-2 _090503
-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-
f o
o
) /
f
(ppm
)
0.05 pF*
0.05 pF
Cp
Co
+
=
*Case Parasitics
Cp
Rm
Lm
Cm
Equivalent LC Mode
l
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions
.
Pin
Connection
1
NC
2
Terminal
3
NC
4
NC
5
Terminal
6
NC
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 indi-
cates 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 Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static
capacitance, C
O
, at F
C
.
Electrical Test
Typical Application Circuits
From 50
Network Analyzer
To 50
Network Analyzer
2
3
6
5
4
1
Low-Loss
Matching
Network to
50
50
Source
at F
C
P
INCIDENT
P
REFLECTED
2 3
6 5 4
1
Modulation
Input
ROXXXXC
Bottom View
200k
C1
L1
(Antenna)
47
+9VDC
C2
RF Bypass
470
Typical Low-Power Transmitter Application
2 3
6 5 4
1
+VDC
ROXXXXC
Bottom View
200k
C1
L1
+VDC
C2
RF Bypass
Typical Local Oscillator Application
Output
2 3
6 5 4
1
1
2
3
6
5
4
1
2
3
6
5
4
A
B
C
D
J
E
G
H
I
Case Dimensions
Dimension
mm
Inches
Min
Nom
Max
Min
Nom
Max
A
3.60
3.80
4.0
0.14
0.15
0.16
B
3.60
3.80
4.0
0.14
0.15
0.16
C
1.00
1.20
1.40
0.04
0.05
0.055
D
0.95
1.10
1.25
0.037
0.043
0.05
E
2.39
2.54
2.69
0.090
0.10
0.110
G
0.90
1.0
1.10
0.035
0.04
0.043
H
1.90
2.0
2.10
0.75
0.08
0.83
I
0.50
0.6
0.70
0.020
0.024
0.028
J
1.70
1.8
1.90
0.067
0.07
0.075
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