390.0 MHz
SAW Resonator
Electrical Connections
Equivalent LC Model
Terminal
The SAW resonator is bidirectional and may be in-
stalled 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 recommend-
ed to help reduce parasitic capacitance in the cir-
cuit.
0.05 pF*
NC
NC
+
C
=
C
o
0.05 pF
p
C
p
*Case Parasitics
Terminal
Lm
Cm
Rm
Temperature Characteristics
The curve shown on the right
fC = fO , T C = TO
0
0
Typical Test Circuit
accounts for resonator contri-
-50
bution only and does not in-
-100
-50
The test circuit inductor, L
, is tuned to resonate with the static capaci-
TEST
-100
-150
-200
tance, C , at F .
O
C
clude LC component tempera-
-150
ture contributions.
-200
-80 -60 -40 -20
0
+20 +40 +60 +80
ELECTRICAL TEST
Typical Circuit Board
Land Pattern
The circuit board land pattern shown below is one possible design. The op-
timum 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 mini-
mize parasitic series inductances.
T = TC - TO ( °C )
D
W
W
From 50
To 50
Network Analyzer
Network Analyzer
(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
47
200k
W
Modulation
Input
C1
L1
(Antenna)
C2
ROXXXXA
Bottom View
Millimeters
Inches
RF Bypass
Dimensions
Min
Max
Min
Max
470
A
B
C
D
E
F
5.97
3.94
2.16
1.10
1.20
1.53
1.10
0.59
0.59
5.31
0.64
3.28
0.235
0.155
0.085
0.043
0.047
0.060
0.043
0.023
0.023
0.209
0.025
0.129
Typical Local Oscillator Application
0.94
0.83
1.16
0.94
0.43
0.43
0.037
0.033
0.046
0.037
0.017
0.017
Output
+VDC
+VDC
C1
G
H
K
M
N
P
L1
C2
ROXXXXA
0.38
0.015
Bottom View
RF Bypass
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-9148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RO2188A-062001
Page 2 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RFM [ RF MONOLITHICS, INC ]
