®
•
•
•
•
Ideal for European 868.95 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Complies with Directive 2002/95/EC (RoHS)
RO2156D
RO2156D-1
RO2156D-2
Pb
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.
868.95 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
Input Power Level
DC Voltage
Storage Temperature
Soldering Temperature (10 seconds / 5 cycles max.)
Value
10
12
-40 to +85
260
Units
dBm
VDC
°C
°C
SM3838-6 Case
3.8 X 3.8
Electrical Characteristics
Characteristic
Frequency at +25°C Nominal Frequency
RO2156D
RO2156D-1
RO2156D-2
Tolerance from 868.95 MHz
RO2156D
RO2156D-1
RO2156D-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
Shunt Static Capacitance
Lid Symbolization (in Addition to Lot and/ or Date Code)
Standard Reel Quanitity
DC Insulation Resistance between Any Two Terminals
R
M
L
M
C
M
C
O
5, 6, 7, 9
5, 6, 7, 9
IL
Q
U
Q
L
T
O
f
O
FTC
|fA|
1
5
1.0
15
50
0.7
2.3
433 / YWWD
3000 Pieces / Reel
6,7,8
2,5,6
5,6,7
20,000
2,400
10
25
f
C
0.032
<±10
40
°C
kHz
ppm/°C
2
ppm/yr
MΩ
Ω
µH
fF
pF
1.1
∆f
C
-75
f
C
2,3,4,5
Sym
Notes
Minimum
868.875
868.875
868.850
Typical
Maximum
869.025
869.175
869.050
±75
+225
±100
2.0
dB
kHz
MHz
Units
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
Lifetime (10 year) frequency aging.
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
.
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 gov-
ernment approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature T
C
= +25°C±2°C for all specifica-
tions.
The design, manufacturing process, and specifications of this device are sub-
ject 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) 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
].
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
Ο
−
0.05 pF.
E-mail: info@rfm.com
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RO2156D_RO2156D-1_RO2156D-2 _090503
3.
4.
5.
6.
9.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
868.95 MHz
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.
Pin
1
2
3
4
5
6
SAW Resonator
Connection
NC
Terminal
NC
NC
Terminal
NC
Power Test
P
INCIDENT
50
Ω
Source
at F
C
P
REFLECTED
Low-Loss
Matching
Network to
50
Ω
1
6
2
3
5
4
Typical Application Circuits
B
1
6
6
1
Modulation
Input
C
G
H
Typical Low-Power Transmitter Application
200k
Ω
C1
L1
(Antenna)
+9VDC
47
A 2
5
E
5
2
I
2
3
4
3
4
3
6
1
5
4
C2
D
J
ROXXXXC
Bottom View
RF Bypass
470
Typical Local Oscillator Application
Output
Case Dimensions
Dimension
A
B
C
D
E
G
H
I
J
Min
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
Max
4.0
4.0
1.40
1.25
2.69
1.10
2.10
0.70
1.90
Min
0.14
0.14
0.04
0.037
0.090
0.035
0.75
0.020
0.067
Inches
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
200k
Ω
+VDC
C1
L1
+VDC
1
6
2
3
5
4
C2
ROXXXXC
Bottom View
RF Bypass
Equivalent LC Mode
l
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
.
f
C
= f
O
, T
C
= T
O
6
1
0
2
0
-50
-100
-150
-200
0 +20 +40 +60 +80
From 50
Ω
Network Analyzer
5
To 50
Ω
Network Analyzer
4
3
(f-fo ) / fo (ppm)
-50
-100
-150
-200
-80 -60 -40 -20
∆
T = T
C
- T
O
( °C )
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
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http://www.rfm.com
RO2156D_RO2156D-1_RO2156D-2 _090503
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