ETC RP1239

RP1239
®
•
•
•
•
Designed for 315 MHz Transmitters
Nominal Insertion Phase Shift of 180° at Resonance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
315.0 MHz
SAW
Resonator
The RP1239 is a two-port, 180° surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It provides reliable, fundamental-mode, quartz frequency stabilization of low-power AM and FSK transmitters
operating at 315.0 MHz for use in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part
15. Applications include remote-control and wireless security devices. This is a pin-for-pin replacement in
preexisting transmitter circuits utilizing two-port, 180° SAW resonators.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See: Typical Test Circuit)
+0
dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions)
±30
VDC
-40 to +85
°C
Case Temperature
TO39-3 Case
Electrical Characteristics
Center Frequency
Characteristic
Absolute Frequency
Tolerance from 315.000 MHz
Insertion Loss
Quality Factor
Temperature Stability
2, 3, 4, 5,
IL
2, 5, 6
QU
50 Ω Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
Absolute Value during First Year
Minimum
314.925
|fA|
RM
Motional Inductance
LM
Motional Capacitance
CM
Shunt Static Capacitance
CO
Maximum
315.075
Units
MHz
±75
kHz
8.5
dB
18,000
5, 6, 7
8,100
37
6, 7, 8
52
67
kHz
0.037
ppm/°C2
ppm/yr
1.0
MΩ
84
5, 7, 9
167
758.027
1.9
Lid Symbolization (in addition to Lot and/or Date Codes)
2.2
Ω
µH
0.336771
5, 6, 9
°C
fC+8.5
≤ 10
6
5
Motional Resistance
Typical
5.3
FTC
DC Insulation Resistance between Any Two Pins
RF Equivalent RLC
Notes
∆fC
Unloaded Q
Frequency Temp. Coefficient
Frequency Aging
Sym
fC
fF
2.5
pF
RFM P1239
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Notes:
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 frequency fC is the frequency of minimum IL with the resonator in the specified test fixture in a 50 Ω test system with VSWR ≤ 1.2:1. Typically,
fOSCILLATOR or fTRANSMITTER is less than the resonator fC.
One or more of the following United States patents apply: 4,454,488; 4,616,197.
Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature TC = +25°C± 5°C
The design, manufacturing process, and specifications of this device are subject to change without notice.
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° 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 measured static (nonmotional) capacitance between either pin 1 and ground or pin 2 and ground. The measurement includes case parasitic
capacitance.
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
RP1239-110499
Page 1 of 2
315.0 MHz
SAW Resonator
Electrical Connections
Equivalent LC Model
This two-port, three-terminal SAW resonator is bidirectional. However, impedances and circuit board parasitics may not be symmetrical, requiring
slightly different oscillator component-matching values.
The following equivalent LC model is valid near resonance:
2
1
LM
R
Pin
Connection
1
2
3
Input or Output
Output or Input
Case Ground
M
C
M
Co
Co
Bottom View
3
Pin 1
Pin 2
Pin 3
Temperature Characteristics
Power Test
P
INCIDENT
Electrical Test
1
50 Ω
Source at P
REFLECTED
F
C
From 50Ω
Network
Analyzer
2
Low-Loss
Matching
Network
to 50 Ω
2
1
fC = f O , T C = T O
0
0
-50
-50
-100
-100
-150
-150
(f-fo ) / fo (ppm)
Typical Test Circuit
The curve shown on the right
accounts for resonator contribution only and does not
include LC component temperature contributions.
-200
0 +20 +40 +60 +80
-200
-80 -60 -40 -20
To 50Ω
Network
Analyzer
∆T = T C - T O ( °C )
3
3
Typical Frequency Response
-P
CW RF Power Dissipation = P
REFLECTED
INCIDENT
The plot shown below is a typical frequency response for the RP series of
two-port resonators. The plot is for RP1094.
200.0
-10.0
Typical Application Circuits
100.0
-20.0
This SAW resonator can be used in oscillator or transmitter designs that
require 180° phase shift at resonance in a two-port configuration. Oneport resonators can be simulated, as shown, by connecting pins 1 and 2
together. However, for most low-cost consumer products, this is only
recommended for retrofit applications and not for new designs.
Conventional Two-Port Design:
0.0
-200.0
-300.0
-400.0
-40.0
Simulated One-Port Design:
S21 phase (deg.)
S21 magn.(dB)
-100.0
-30.0
-500.0
-600.0
-50.0
-700.0
-60.0
1
Phasing
Phasing
& Match
& Match
2
901.2
-800.0
905.2
909.2
913.2
917.2
921.2
925.2
929.2
Frequency (MHz)
3
Millimeters
Case Design
Inches
Dimensions
Min
C
A
G
B
B
C
H
F
E
A
D
(3 places)
J
(2 places)
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.
Min
3.50
Max
0.370
3.18
2.50
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
45°
Max
9.40
J
1.02
1.40
0.040
0.055
E-mail: [email protected]
http://www.rfm.com
RP1239-110499
Page 2 of 2