SAW Resonator
HR643.75
The
HR643.75
is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount
ceramic
QCC8C
case. It provides reliable, fundamental-mode, quartz frequency stabilization i.e.
in transmitters or local oscillators operating at
643.750
MHz.
1. Package Dimension
(QCC8C)
Pin
2
6
4,8
1,3,5,7
Sign
A
B
C
D
Data (unit: mm)
2.08
0.6
1.27
2.54
Sign
E
F
G
H
Configuration
Terminal1
Terminal2
Case Ground
Empty
Data (unit: mm)
1.2
1.35
5.0
5.0
2. Marking
3. Equivalent LC Model and Test Circuit
HR643.75
Laser Marking
4. Typical Application Circuits
1) Low-Power Transmitter Application
2) Local Oscillator Application
5. Typical Frequency Response
6. Temperature Characteristics
Tel:+86-755-82973806 Fax:+86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
SAW Resonator
7.Performance
7-1.Maximum Ratings
Rating
CW RF Power Dissipation
DC Voltage Between Terminals
Storage Temperature Range
Operating Temperature Range
P
V
DC
T
stg
T
A
HR643.75
Value
0
±30
-40 to +85
-10 to +60
Unit
dBm
V
℃
℃
7-2.Electronic Characteristics
Characteristic
Center Frequency
(+25℃)
Insertion Loss
Unloaded Q
Quality Factor
50
Ω
Loaded Q
Turnover Temperature
Temperature
Stability
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
Absolute Value during the First Year
Absolute Frequency
Tolerance from 643.750 MHz
Sym
f
C
∆f
C
IL
Q
U
Q
L
T
0
f
0
FTC
|fA|
Minimum
643.675
Typical
Maximum
643.825
Unit
MHz
kHz
±75
1.5
9,400
1,500
25
f
C
0.032
≤10
1.0
55
2.0
dB
℃
kHz
ppm/℃
2
ppm/yr
MΩ
DC Insulation Resistance Between Any Two Terminals
Motional Resistance
RF Equivalent
RLC Model
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
R
M
L
M
C
M
C
0
19
44.1531
1.3858
1.65
1.95
26
Ω
µH
fF
2.25
pF
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling!
C
○
1.
2.
3.
2003. All Rights Reserved.
The center frequency, f
C
, is measured at the minimum IL point with the resonator in the 50Ω test system.
Unless noted otherwise, case temperature T
C
= +25°C±2°C.
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 in subsequent years.
4. Turnover temperature, T
0
, is the temperature of maximum (or turnover) frequency, f
0
. The nominal frequency at
any case temperature, T
C
, may be calculated from: f = f
0
[1 - FTC (T
0
- T
C
)
2
].
5. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided
for reference only. The capacitance C
0
is the measured static (nonmotional) capacitance between the two
terminals. The measurement includes case parasitic capacitance.
6. 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
0
.
7. The specifications of this device are based on the test circuit shown above and subject to change or
obsolescence without notice.
8. Typically, equipment utilizing this device requires emissions testing and government approval, which is the
responsibility of the equipment manufacturer.
9. Our liability is only assumed for the Surface Acoustic Wave (SAW) component(s) per se, not for applications,
processes and circuits implemented within components or assemblies.
10. For questions on technology, prices and delivery, please contact our sales offices or e-mail
sales@hoperf.com.
Tel:+86-755-82973806 Fax:+86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com
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