RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
E-mail: info@rfm.com
Page 1 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RO2188-031300
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency at +25 C
Absolute Frequency
f
C
2, 3, 4, 5
389.900
390.100
MHz
Tolerance from 304.0 MHz
f
C
100
kHz
Insertion Loss
IL
2, 5, 6
0.9
2.0
dB
Quality Factor
Unloaded Q
Q
U
5, 6, 7
12,000
50
Loaded Q
Q
L
1,200
Temperature Stability
Turnover Temperature
T
O
6, 7, 8
27
42
57
C
Turnover Frequency
f
O
f
C
-5
kHz
Frequency Temperature Coefficient
FTC
0.037
ppm/C
2
Frequency Aging
Absolute Value during the First Year
|fA|
1
10
ppm/yr
DC Insulation Resistance between Any Two Terminals
5
1.0
M
RF Equivalent RLC Model
Motional Resistance
R
M
5, 7, 9
11
26
Motional Inductance
L
M
54.963
H
Motional Capacitance
C
M
3.0299
fF
Pin 1 to Pin 2 Static Capacitance
C
O
5, 6, 9
3.6
3.9
4.2
pF
Transducer Static Capacitance
C
P
5, 6, 7, 9
3.65
pF
Test Fixture Shunt Inductance
L
TEST
2, 7
43
nH
Lid Symbolization
E319
Ideal for 390.0 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Rugged, Hermetic, TO39-3 Package
Complies with Directive 2002/95/EC (RoHS)
The RO2188 is a true one-port, surface-acoustic-wave (SAW) resonator in TO39-3 case. It provides reliable,
fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at 390.0 MHz.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation
+5
dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions)
30
VDC
Case Temperature
-40 to +85
C
390.0 MHz
SAW
Resonator
RO2188
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
Lifetime (10 year) frequency aging.
2.
The center frequency, f
C
, is measured at the minimum insertion loss point,
IL
MIN
, with the resonator in the 50
test system (VSWR
1.2:1). The shunt
inductance, L
TEST
, is tuned for parallel resonance with C
O
at f
C
.
3.
One or more of the following United States patents apply: 4,454,488 and
4,616,197.
4.
Typically, equipment utilizing this device requires emissions testing and gov-
ernment approval, which is the responsibility of the equipment manufacturer.
5.
Unless noted otherwise, case temperature T
C
= +25C2C.
6.
The design, manufacturing process, and specifications of this device are sub-
ject to change without notice.
7.
Derived mathematically from one or more of the following directly measured
parameters: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
8.
Turnover temperature, T
O
, is the temperature of maximum (or turnover) fre-
quency, f
O
. The nominal frequency at any case temperature, T
C
, may be cal-
culated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
].
9.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance C
O
is
the static (nonmotional) capacitance between the two terminals measured at
low frequency (10 MHz) with a capacitance meter. The measurement
includes parasitic capacitance with a floating case. Case parasitic capaci-
tance is approximately 0.25pF. Transducer parallel capacitance can be cal-
culated as: C
P
C
O
- 0.25pF.
TO39-3 Case
Pb
390.0 MHz SAW Resonator
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
E-mail: info@rfm.com
Page 2 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RO2188-031300
Electrical Connections
This one-port, two-terminal SAW resonator is bidirectional. The terminals
are interchangeable with the exception of circuit board layout.
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static capaci-
tance, C
O
at F
C
.
Typical Application Circuits
Temperature Characteristics
Equivalent LC Model
The following equivalent LC model is valid near resonance:
Case Design
Pin
Connection
1
Terminal 1
2
Terminal 2
3
Case Ground
Network
Analyzer
Network
Analyzer
Electrical Test:
1
2
3
50
Source at
FC
Low-Loss
Matching
Network
50
to
Power Test:
P
P
INCIDENT
INCIDENT
CW RF Power Dissipation =
-
REFLECTED
REFLECTED
P
P
3
2
1
MPS-H10
+9VDC
47
RF Bypass
L1
C1
C2
200k
Modulation
Input
ROXXXX
Bottom View
470
Typical Low-Power Transmitter Application:
1
2
3
(Antenna)
+VDC
RF Bypass
L1
C2
ROXXXX
Bottom View
Typical Local Oscillator Application:
1
2
3
Output
+VDC
C1
Dimensions
Millimeters
Inches
Min
Max
Min
Max
A
9.40
0.370
B
3.18
0.125
C
2.50
3.50
0.098
0.138
D
0.46 Nominal
0.018 Nominal
E
5.08 Nominal
0.200 Nominal
F
2.54 Nominal
0.100 Nominal
G
2.54 Nominal
0.100 Nominal
H
1.02
0.040
J
1.40
0.055
The curve shown on the right
accounts for resonator contri-
bution only and does not in-
clude oscillator temperature
characteristics.
-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
o
) /
f
(ppm
)
0.5 pF*
0.25 pF*
Cp
Co=
+
*Case Parasitics
R
L
C
0.5 pF*
Cp
1
2
3
M
M
M
B
45
J
(2 places)
D
(3 places)
H
G
E
F
C
A
Bottom View
Pin 1
Pin 2
Pin 3
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