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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RO2156D_RO2156D-1_RO2156D-2 _090503
RFM [ RF MONOLITHICS, INC ]
