RO2116A Datasheet, PDF (2/2 Pages) RF Monolithics, Inc – 303.325 MHz SAW Resonator

303.325 MHz
SAW Resonator
Electrical Connections
The SAW resonator is bidirectional and may be in-
Terminal
stalled with either orientation. The two terminals
are interchangeable and unnumbered. The callout ^NC
NC
NC indicates no internal connection. The NC pads
assist with mechanical positioning and stability.
Terminal
External grounding of the NC pads is recommend-
ed to help reduce parasitic capacitance in the cir-
cuit.
Typical Test Circuit
The test circuit inductor, L_TEST, is tuned to resonate with the static capaci-
tance, C_O, at F_C.
ELECTRICAL TEST
From 50 Ω
Network Analyzer
To 50 Ω
Network Analyzer
Equivalent LC Model
0.05 pF*
Cp
Co = Cp + 0.05 pF
*Case Parasitics
Rm Lm Cm
Temperature Characteristics
The curve shown on the right
accounts for resonator contri-
bution only and does not in-
clude LC component tempera-
ture contributions.
Typical Circuit Board
Land Pattern
f_C = f_O , T_C = T_O
0
0
-50
-50
-100
-100
-150
-150
-200
-200
-80 -60 -40 -20 0 +20 +40 +60 +80
∆T = TC - TO ( °C )
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.
Typical Application Circuits
(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 Low-Power Transmitter Application
Modulation
Input
200k Ω
+9VDC
47
C1
L1
(Antenna)
ROXXXXA
Bottom View
C2
470
RF Bypass
Typical Local Oscillator Application
+VDC
C1
Output
+VDC
L1
ROXXXXA
Bottom View
C2
RF Bypass
Dimensions
A
B
C
D
E
F
G
H
K
M
N
P
Millimeters
Min
Max
5.74
5.99
3.73
3.99
1.91
2.16
0.94
1.10
0.83
1.20
1.16
1.53
0.94
1.10
0.43
0.59
0.43
0.59
5.08
5.33
0.38
0.64
3.05
3.30
Inches
Min
0.226
0.147
0.075
0.037
0.033
0.046
0.037
0.017
0.017
0.200
0.015
0.120
Max
0.236
0.157
0.085
0.043
0.047
0.060
0.043
0.023
0.023
0.210
0.025
0.130
RF Monolithics, Inc. Phone: [phone]
Fax: [phone]
RFM Europe
Phone: [phone]
Fax: [phone]
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [e-mail]
http://www.rfm.com
RO2116A-012303
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