315.00MHz
Ideal for 315.00MHz Transmitters
Low Series Resistance
Quartz Stability
Rugged, Hermetic, Low-profile TO-39 Case
LADDER
®
SAW Resonator
315.00 MHz
SAW
Resonator
The LR1 315.00 is a true one-port, surface-acoustic-wave (SAW) resonator in low-profile TO-39 case. It provides
reliable, fundamental-mode. quartz frequency stabilization of fixed-frequency transmitters operating at 315 MHz.
The LR1 315.00 is designed specifically for wireless remote controls and security transmitters. Typically for
automotive-keyless-entry, operating in the USA under FCC Part15, in Canada under DoC RSS-210. and in Italy.
Absolute Maximum Ratings
Rating
CW RF Power Dissipation (See Typical Test Circuit)
DC Voltage Between Any Two Pins (Observe ESD Precautions)
Case Temperature
Value
+0
±30
-40 to +85
Units
dBm
VDC
℃
Electrical Characteristics
Characteristics
Center Frequency (+25℃)
Absolute Frequency
Tolerance from 315.000MHz
Insertion Loss
Quality Factor
Unloaded Q
50Ωloaded Q
Temperature Stability
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
Absolute Value during the First Year
Sym
f
c
Δf
c
IL
Q
U
Q
L
T
O
f
O
FTC
If
A
I
1
5
R
M
L
M
5,7,9
Motional Capacitance
Pin 1 to Pin 2 Static Capacitance
Transducer Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization (in Addition to Lot and/or Date Code
C
M
C
O
C
P
L
TEST
5,6,9
5,6,7,9
2,7
2.3
1.99943
2.6
2.3
100
LR1 315.00
2.9
pF
pF
pF
nH
1.0
19
127.677
29
5,7,8
5,6,7
10
2,3,4,5
2,5,6
1.5
13.300
2.000
25
f
c
0.037
≦10
40
℃
KHz
ppm/℃
2
ppm/yτ
MΩ
Ω
μH
Notes
Minimum
314.925
Typical
Maximum
315.075
±75
2.2
Units
MHz
KHz
dB
DC Insulation Resistance between Any Two Pins
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
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℃ or
less. Aging may exceed the specification for prolonged temperatures
above +65℃. Typically, aging is greatest the first year after manufacture,
decreasing significantly in subsequent years.
The center frequency, f
C
, is measured at the minimum insertion loss point,
IL
MIN
with the resonator in the 50Ω test system(VSWR≦1.2:1).The shunt
inductance, L
TEST
, is turned for parallel resonator with C
O
at f
c
. Typically,
f
OSCILLATOR
or f
TRANSMITTER
is less than the resonator f
c
.
One or more of 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℃±2℃.
The design, manufacturing process, and specifications of this device are
subject to change without notice.
7.
Derived mathematically from one or more of the following
directly measured parameter: f
c
, IL, 3dB bandwidth, f
c
versus T
c,
and C
o
.
Turnover temperature, T
o
, is the temperature of maximum
(or turnover) frequency, f
o
. The nominal frequency at any
case temperature, T
c
. may be calculated from:
f=f
o
[1-FTC(T
o
-T
c
)
2
]. Typically,
oscillator
T
o
is 20℃ less
than the specified
resonator
T
o.
This equivalent RLC model approximates resonators
performance near the resonant frequency and is provided
for reference only. The capacitance C
o
is the static (non-
motional) capacitance between pin 1 and pin 2 measured
at low frequency (10MHz) 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 0.25pF to C
o
.
8.
2.
3.
4.
9.
5.
6.
2
315.00MHz
Electrical Connections
LADDER
Equivalent LC Model
®
SAW Resonator
The following equivalent LC model is valid near resonance:
This one-port, two-terminal SAW resonator is bi-directional. The
terminals are interchangeable with the exception of circuit board layout.
Pin Connection
1 Terminal 1
2 Terminal 2
3 Case Ground
Typical Test Circuit
The test circuit inductor, L
TEST
, is turn to resonate with the static
capacitance, C
o
at F
c
.
Electrical Test:
Case Design
Power Test:
Dimensions
A
B
C
D
E
F
G
H
J
Millimeters
Min
Max
9.30
3.50
2.50
3.50
0.50 Nominal
5.08 Nominal
2.54Nominal
2.54Nominal
1.02
1.75
Inches
Max
0.366
0.138
0.098
0.138
0.020 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
0.040
0.069
Min
Typical Application Circuits
Typical Low-Power Transmitter Application:
Frequency Response
Typical Local Oscillator Application:
Temperature Characteristics
The curve shown on the right accounts for resonator
contribution only and does not include oscillator temperature
characteristics.
3
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