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| 型号： | RO3115A |
| 厂商： | RF MONOLITHICS INC |
| 元件分类： | SAW谐振器 |
| 英文描述： | 1-PORT SAW RESONATOR, 417.5 MHz |
| 封装： | ROHS COMPLIANT, CERAMIC, CASE SM5035-4, 4 PIN |
| 文件页数： | 2/2页 |
| 文件大小： | 68K |
| 代理商： | RO3115A |
www.RFM.com E-mail: info@rfm.com
Page 2 of 2
2009 by RF Monolithics, Inc.
RO3115A - 1/29/09
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.
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
Typical Application Circuits
Equivalent LC Model
Temperature Characteristics
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
Typical
Circuit
Board
Land Pattern
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.
Case Design
Terminal
C
a
s
e
G
ro
u
n
d
C
a
s
e
G
ro
u
n
d
ELECTRICAL TEST
From 50
Network Analyzer
To 50
Network Analyzer
50
Source
at F
C
REFLECTED
INCIDENT
P
Low-Loss
Matching
Network to
50
Terminal
NC
POWER TEST
CW RF Power Dissipation =
INCIDENT -
REFLECTED
P
C1
C2
L1
(Antenna)
+9VDC
47
RF Bypass
Modulation
Input
Typical Low-Power Transmitter Application
RO3XXXA
Bottom View
470
200k
C1
C2
L1
Output
+VDC
RF Bypass
+VDC
Typical Local Oscillator Applications
RO3XXXA
Bottom View
Dimension
s
Millimeters
Inches
Min
Nom
Max
Min
Nom
Max
A
4.87
5.0
5.13
.191
.196
.201
B
3.37
3.5
3.63
.132
.137
.142
C
1.45
1.531.60.057
.060.062
D
1.35
1.431.50.040
.057.059
E
.67
.80
.93
.026
.031
.036
F
.37
.50
.63
.014
.019
.024
G
1.07
1.201.33.042
.047.052
0.05 pF*
0.05 pF
Cp
Co
+
=
*Case Parasitics
Cp
Rm
Lm
Cm
-80 -60 -40 -20
0 +20 +40 +60
0
-50
-100
-150
+80
-200
0
-50
-100
-150
-200
f
C = f O , T C = T O
T = T
C - T O ( °C )
(f
-f
o
) /
f
(p
p
m
)
Typical Dimension:
0.010 to 0.047 inch
(0.25 to 1.20 mm)
(4 Places)
A
B
C
D
E (3x)
F (4x)
G (1x
Top View
Side View
Bottom View
1
2
3
4
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