Temperature Compensated
Crystal Oscillators
KT18 Series
FEATURES
• Miniature SMD type
(5.0x3.2x1.5mm)
• Frequency adjustment free
after reflow soldering process
• AFC function available
• 2.6 to 5.5V
drive available
• Frequency Stability =
±2ppm at 30 to +80°C
APPLICATIONS
DIMENSIONS
5.0 (0.197)
±0.2
(0.008)
MARKING AREA
millimeters (inches)
• PDC, GSM, CDMA, TDMA
HOW TO ORDER
KT18 - D C V 30 A - 19.680M T
3.2 (0.126)
±0.2
(0.008)
#1pin Marking
Packaging
T = Tape and reel 4,000 pcs/reel
Frequency (MHz)
1.5 (0.059)
(MAX)
0.45 (0.018)
±0.1
(0.004)
Terminal:W+Ni(1~9µm)+Au(0.3~0.7µm)
2.95 (0.116)
±0.15
(0.006)
1
0.7 (0.028)
±0.1
(0.004)
1.6 (0.063)
0.7 (0.028)
±0.1
(0.004)
4
0.95 (0.037)
±0.1(
0.004)
3
2
12.800
13.000
14.400
Pin Configuration
16.800
19.200
19.440
19.680
19.800
26.000
AFC Function
A = Yes
➀
➁
➂
➃
N.CorVcon
GND/CASE GND
OUTPUT
+Vcc
Supply Voltage
28 = 2.8V,
30 = 3.0V
Upper Operating Temp.
V = 80°C, T = 70°C, R = 60°C
Lower Operating Temp.
C = -30°C, G = -10°C, E = -20°C
Frequency Stability
K = ±5ppm, E = ±2.5ppm,
D = ±2.0ppm
TEST CIRCUIT
Test Circuit 1 (Amplitude)
A
Synchronized
Scope Counter
POWER
SUPPLY
Vcc
Series
Test Circuit 2 (Harmonics and Frequency)
A
Spectrum
Analyzer
POWER
SUPPLY
Vcc
V
4 3
OSCILLATOR
1 2
Vcon or N.C.
10kΩ
±5%
100kΩ
C1
V
4 3
OSCILLATOR
1 2
Vcon or N.C.
10kΩ
±5%
100kΩ
10pF
±5%
SPECIFICATIONS
Items
Supply Voltage
Output Frequency
Operating Temperature
Storage Temperature
Frequency Stability
Aging Rate
Output Voltage
Supply Current
Trimmer Control Range
Voltage Control Range
Harmonics
Code
V
CC
fo
Topr
Tstg
f/fo
Aging
Vout
Icc
f/C
f/V
—
26.000
19.680
13.000
Specifications
Cellular
2.6 to 5.5
19.440
14.400
12.800
-30 to +80
-40 to +85
±1.5 max.
±2.0 max.
±0.2 max.
±0.3 max.
±1.0 max.
0.8 min.
2.0 max.
—
±8.0 to ±15
-3.0 max.
Unit
V
19.200
19.800
16.800
MHz
°C
°C
ppm
ppm
ppm
ppm/year
Vp-p
mA
ppm
ppm
dBc
Remarks
—
—
—
—
vs temperature (after reflow)
vs load
vs voltage
25°C±2°C
load 10kΩ/10pF
—
—
—
—
41
PCB Design
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