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.
Terminal
Case Ground
Case Ground
Equivalent LC Mode
l
0.05 pF*
Co = Cp + 0.05 pF
Cp
*Case Parasitics
Terminal
Rm
Lm
Cm
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static
capacitance, C
O
, at F
C
.
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
0
(f-fo ) / fo (ppm)
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-50
-100
ELECTRICAL TEST
From 50
Ω
Network Analyzer
To 50
Ω
Network Analyzer
-150
-200
-80 -60 -40 -20
Typical Circuit
Land Pattern
Board
POWER TEST
P INCIDENT
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.
Δ
T = T
C
- T
O
( °C )
(4 Places)
Low-Loss
Matching
Network to
50
Ω
Terminal
NC
NC
Terminal
50
Ω
Source
P
at F
C
REFLECTED
Typical Dimension:
0.010 to 0.047 inch
(0.25 to 1.20 mm)
Case Design
CW RF Power Dissipation =
P INCIDENT - P REFLECTED
Typical Application Circuits
Top View
B
Side View
C
Bottom View
E (3x)
Typical Low-Power Transmitter Application
+9VDC
200k
Ω
Modulation
Input
C1
47
L1
(Antenna)
3
2
1
A
4
F (4x)
C2
RO3XXXA
Bottom View
470
RF Bypass
D
G (1x)
Typical Local Oscillator Applications
Output
+VDC
C1
L1
C2
RO3XXXA
Bottom View
RF Bypass
+VDC
Millimeters
Dimensions
Min
A
B
C
D
E
F
G
4.87
3.37
1.45
1.35
.67
.37
1.07
Inches
Max
5.13
3.63
1.60
1.50
.93
.63
1.33
Nom
5.0
3.5
1.53
1.43
.80
.50
1.20
Min
.191
.132
.057
.040
.026
.014
.042
Nom
.196
.137
.060
.057
.031
.019
.047
Max
.201
.142
.062
.059
.036
.024
.052
www.RFM.com
E-mail: info@rfm.com
©2008 by RF Monolithics, Inc.
Page 2 of 2
RO3101A - 3/26/08
RFM [ RF MONOLITHICS, INC ]
