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Electrical Connections
Equivalent LC Mode l
The SAW resonator is bidirectional and may be
installed with either orientation. The two terminals
Terminal
0.05 pF*
are interchangeable and unnumbered. The callout
NC indicates no internal connection. The NC pads
NC
NC
Cp
Co = Cp + 0.05 pF
*Case Parasitics
assist with mechanical positioning and stability.
Terminal
External grounding of the NC pads is
recommended to help reduce parasitic
Rm
Lm
Cm
capacitance in the circuit.
Temperature Characteristics
The curve shown on the right
f C = f O , T C = T O
Typical Test Circuit
The test circuit inductor, L TEST , is tuned to resonate with the static
capacitance, C O , at F C .
accounts for resonator
contribution only and does not
include LC component
temperature contributions .
0
-50
-100
-150
-200
-80 -60 -40 -20
0
-50
-100
-150
-200
0 +20 +40 +60 +80
ELECTRICAL TEST
Typical Circuit
Board
? T = T C - T O ( °C )
Land Pattern
From 50 ?
Network Analyzer
To 50 ?
Network Analyzer
The circuit board land pattern shown below is one possible design. The
optimum land pattern is dependent on the circuit board assembly process
which varies by manufacturer. The distance between adjacent land edges
should be at a maximum to minimize parasitic capacitance. Trace lengths
from terminal lands to other components should be short and wide to
minimize parasitic series inductances.
(4 Places)
Typical Dimension:
0.010 to 0.047 inch
(0.25 to 1.20 mm)
Case Design
The case material is black alumina with contrasting symbolization. All pads
are nominally centered with respect to the base and consist of 40 to
70 microinches electroless gold on 60-350 micorinches electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation
Input
200k ?
C1
L1
47
(Antenna)
ROXXXXA
C2
Bottom View
RF Bypass
Millimeters
Inches
470
Typical Local Oscillator Application
Output
Dimensions
A
B
C
D
E
Min
5.74
3.73
1.70
0.94
0.83
Max
5.99
3.99
2.29
1.10
1.20
Min
0.226
0.147
0.067
0.037
0.033
Max
0.236
0.157
0.090
0.043
0.047
+VDC
C1
L1
+VDC
F
1.16
1.53
0.046
0.060
G
H
K
0.94
0.43
0.43
1.10
0.59
0.59
0.037
0.017
0.017
0.043
0.023
0.023
ROXXXXA
Bottom View
C2
RF Bypass
M
N
P
5.08
0.38
3.05
5.33
0.64
3.30
0.200
0.015
0.120
0.210
0.025
0.130
www.RFM.com E-mail: info@rfm.com
?2008 by RF Monolithics, Inc.
Page 2 of 2
RO2073A-6 - 1/7/10
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