RO2003
•
•
•
•
Ideal for Channel 3 CATV Downconverter LOs
True One-Port Configuration
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
The RO2031 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It pro-
vides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency oscillators operating at
674 MHz. Although it is suitable for a wide variety of oscillator applications, this resonator is designed for the
second LO in CATV downconverters with the high IF at 612 MHz and the output at 63 MHz (channel 3).
674.15 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
CW RF Power Dissipation
DC Voltage Between Any Two Pins (Observe ESD Precautions)
Case Temperature
Value
+5
±30
-40 to +85
Units
dBm
VDC
°C
TO39-3 Case
Electrical Characteristics
Characteristic
Center Frequency (+25 °C)
Absolute Frequency
Tolerance from 674.150 MHz
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50
Ω
Loaded Q
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
RF Equivalent RLC Model
Absolute Value during the First Year
Motional Resistance
Motional Inductance
Motional Capacitance
Pin 1 to Pin 2 Static Capacitance
Transducer Static Capacitance
Test Fixture Shunt Induc-
Lid Symbolization
DC Insulation Resistance between Any Two Pins
R
M
L
M
C
M
C
O
C
P
L
TEST
5, 6, 9
5, 6, 7, 9
2, 7
0.8
5, 7, 9
Sym
f
C
∆f
C
IL
Q
U
Q
L
T
O
f
O
FTC
|fA|
1
5
1.0
72
158.590
0.351440
1.1
0.8
50
RFM RO2003
Notes
2, 3, 4, 5
2, 5, 6
5, 6, 7
Minimum
674.050
Typical
Maximum
674.250
±100
7.0
Units
MHz
kHz
dB
4.7
9,330
3,920
50
65
f
c
+ 40
0.037
≤10
80
°C
kHz
ppm/°C
2
ppm/yr
MΩ
6, 7, 8
124
Ω
µH
fF
1.3
pF
pF
nH
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
Frequency aging is the change in f
C
with time and is specified at +65°C or less.
Aging may exceed the specification for prolonged temperatures above +65°C.
Typically, aging is greatest the first year after manufacture, decreasing signifi-
cantly in subsequent years.
The center frequency, f
C
, is measured at the minimum insertion loss point, IL
MIN
,
with the resonator in the 50
Ω
test system (VSWR
≤
1.2:1). The shunt induc-
tance, L
TEST
, is tuned for parallel resonance with C
O
at f
C
. Typically, f
OSCILLA-
TOR
or f
TRANSMITTER
is less than the resonator f
C
.
One or more of the following United States patents apply: 4,454,488 and
4,616,197 and others pending.
Typically, equipment designs utilizing this device require emissions testing and
government approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature T
C
= +25°C±2°C.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
7.
8.
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
.
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 calcu-
lated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
]. Typically,
oscillator
T
O
is 20°C less than
the specified
resonator
T
O
.
This equivalent RLC model approximates resonator performance near the reso-
nant frequency and is provided for reference only. The capacitance C
O
is the
static (nonmotional) capacitance between pin1 and pin 2 measured at low fre-
quency (10 MHz) with a capacitance meter. The measurement includes case
parasitic capacitance with a floating case. For usual grounded case applica-
tions (with ground connected to either pin 1 or pin 2 and to the case), add
approximately 0.25 pF to C
O
.
2.
9.
3.
4.
5.
6.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RO2003-102199
Page 1 of 2
674.15 MHz
Electrical Connections
SAW Resonator
Temperature Characteristics
The curve shown on the right
accounts for resonator contri-
bution only and does not in-
clude oscillator temperature
characteristics.
f
C
= f
O
, T
C
= T
O
0
(f-fo ) / fo (ppm)
This one-port, two-terminal SAW resonator is bidirectional. The terminals
are interchangeable with the exception of circuit board layout.
Pin
1
2
3
Connection
Terminal 1
Terminal 2
Case Ground
Pin 3
Pin 1
Bottom View
Pin 2
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-50
-100
-150
-200
-80 -60 -40 -20
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static capaci-
tance, C
O
at F
C
.
∆
T = T
C
- T
O
( °C )
Electrical Test:
Ω
Network
Analyzer
1
2
Equivalent LC Model
The following equivalent LC model is valid near resonance:
Ω
Network
Analyzer
1
2
Cp
Co= Cp + 0.25 pF*
*Case Parasitics
3
R
M
L
M
C
M
0.5 pF*
0.5 pF*
Power Test:
3
P
INCIDENT
1
Low-Loss
Matching
Network
to 50
Ω
50
Ω
Source at
P
REFLECTED
F
C
3
Case Design
2
B
C
G
CW RF Power Dissipation =
-P
P
INCIDENT
REFLECTED
H
Typical Application Circuits
Typical Low-Power Transmitter Application:
200k
Ω
F
A
D
(3 places)
J
(2 places)
+9VDC
E
Modulation
Input
MPS-H10
47
C1
45°
L1
1
2
(Antenna)
Millimeters
Dimensions
Min
Max
9.30
3.18
2.50
3.50
0.098
0.46 Nominal
5.08 Nominal
2.54 Nominal
2.54 Nominal
1.02
1.40
0.055
Min
Inches
Max
0.366
0.125
0.138
0.018 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
0.040
C2
ROXXXX
Bottom View
3
470
RF Bypass
A
B
C
D
E
Typical Local Oscillator Application:
Output
C1
1
2
+VDC
L1
F
G
H
J
+VDC
C2
ROXXXX
Bottom View
3
RF Bypass
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RO2003-102199
Page 2 of 2
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