RFM RO2021

RO2021
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Designed for 418.05 MHz Transmitter Applications
Low Series Resistance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
Complies with Directive 2002/95/EC (RoHS)
Pb
418.05 MHz
SAW
Resonator
The RO2021 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It provides reliable, fundamental-mode quartz frequency stabilization, of fixed frequency transmitters operating at
418.050 MHz. The RO2021 is designed specifically for remote control and wireless security AM transmitters
operating in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See: Typical Test Circuit)
+5
dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions)
±30
VDC
-40 to +85
°C
Case Temperature
TO39-3 Case
Electrical Characteristics
Frequency (+25 °C)
Characteristic
Nominal Frequency
Sym
fC
Tolerance from 418.050 MHz
Insertion Loss
Quality Factor
Temperature Stability
Frequency Aging
Notes
∆fC
2, 3, 4, 5
IL
2, 5, 6
Unloaded Q
QU
50 Ω Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
Frequency Temperature Coefficient
FTC
Absolute Value during the First Year
|fA|
2.5
Maximum
Units
418.125
MHz
±75
kHz
7.0
dB
11,300
2,800
41
6, 7, 8
1, 6
5
Typical
417.975
5, 6, 7
DC Insulation Resistance between Any Two Pins
RF Equivalent RLC Model
Minimum
56
71
°C
fC+15
kHz
0.037
ppm/°C2
ppm/yr
10
1.0
MΩ
Ω
Motional Resistance
RM
Motional Inductance
LM
Motional Capacitance
CM
Pin 1 to Pin 2 Static Capacitance
CO
5, 6, 9
Transducer Static Capacitance
CP
5, 6, 7, 9
2.1
pF
LTEST
2, 7
66
nH
Test Fixture Shunt Inductance
33
5, 6, 7, 9
2.1
Lid Symbolization (in addition to Lot and/or Date Codes)
124
141.965
µH
1.02095
fF
2.4
2.7
pF
RFM 2021
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
3.
4.
5.
6.
Frequency aging is the change in fC 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 significantly in subsequent years.
The center frequency, fC, is measured at the minimum insertion loss point, ILMIN,
with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The shunt inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOSCILLATOR or fTRANSMITTER is less than the resonator fC.
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 TC = +25°C±2°C.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
7.
8.
9.
Derived mathematically from one or more of the following directly measured
parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
Turnover temperature, TO, is the temperature of maximum (or turnover) frequency, fO. The nominal frequency at any case temperature, TC, may be calculated from: f = fO [1 - FTC (TO -TC)2]. Typically, oscillator TO is 20°C less than
the specified resonator TO.
This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance CO is the
static (nonmotional) capacitance between pin1 and pin 2 measured at low frequency (10 MHz) with a capacitance meter. The measurement includes case
parasitic capacitance with a floating case. For usual grounded case applications (with ground connected to either pin 1 or pin 2 and to the case), add
approximately 0.25 pF to CO.
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: [email protected]
http://www.rfm.com
RO2021-102199
Page 1 of 2
418.05 MHz
SAW Resonator
Electrical Connections
Temperature Characteristics
Pin
Connection
1
Terminal 1
2
Terminal 2
3
Case Ground
Bottom View
Pin 1
Pin 2
The curve shown on the right
accounts for resonator contribution only and does not include oscillator temperature
characteristics.
fC = f O , T C = T O
0
0
-50
-50
-100
-100
-150
-150
(f-fo ) / fo (ppm)
This one-port, two-terminal SAW resonator is bidirectional. The terminals
are interchangeable with the exception of circuit board layout.
-200
-80 -60 -40 -20
Pin 3
-200
0 +20 +40 +60 +80
∆T = TC - T O ( °C )
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO at FC.
Equivalent LC Model
Electrical Test:
The following equivalent LC model is valid near resonance:
Ω
1
Ω
2
1
Network
Analyzer
2
Network
Analyzer
Co= Cp + 0.25 pF*
Cp
3
*Case Parasitics
R
M
L
M
C
M
0.5 pF*
0.5 pF*
Power Test:
3
P
INCIDENT
50 Ω
Source at P
REFLECTED
F
C
1
Low-Loss
Matching
Network
to 50 Ω
Case Design
3
2
C
G
B
CW RF Power Dissipation =
-P
P
INCIDENT
REFLECTED
H
F
Typical Application Circuits
D
(3 places)
Typical Low-Power Transmitter Application:
Modulation
Input
200k Ω
E
A
J
(2 places)
MPS-H10
45°
+9VDC
47
C1
1
L1
Millimeters
(Antenna)
2
Inches
Dimensions
Min
C2
ROXXXX
Bottom View
3
RF Bypass
A
B
470
C
Typical Local Oscillator Application:
Output
+VDC
C1
1
L1
+VDC
2
Bottom View
3
Min
3.18
2.50
3.50
Max
0.370
0.125
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
J
C2
ROXXXX
Max
9.40
1.02
1.40
0.040
0.055
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: [email protected]
http://www.rfm.com
RO2021-102199
Page 2 of 2