VOLTAGE CONTROLLED (VCXO)
Q-TECH
CORPORATION
CRYSTAL CLOCK OSCILLATORS
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
Description
Features
Q-Tech’s voltage-controlled crystal oscillators (VCXO)
consist of a varactor diode and associated circuitry such as a
bipolar transistor or logic IC amplifier, logic output buffers
and/or logic divider stages, and a round AT high-precision
quartz crystal built in a wide selection of Dual-In-Line (DIP)
or Surface -Mount (SMT) hermetically sealed packages.
• Made in the USA
• ECCN: EAR99
• DFARS 252-225-7014 Compliant:
Electronic Component Exemption
• USML Registration # M17677
• Wide frequency range from 1kHz to 155.52MHz
• Wide operating temperature range -55ºC to +125ºC
• Choice of output logic options ( ACMOS, HCMOS,
LVHCMOS, TTL, Sine, and ECL outputs)
• Supply voltage -5.2Vdc & 5Vdc ±10%
• Hermetically sealed package
• Tight or custom symmetry available
• Wide pull range up to ±500ppm (optional)
• Special linearity (<5%, <10% optional)
• Positive or Negative Transfer function
• Bipolar control (±Vc)
• Fundamental designs
• Q-Tech does not use pure lead or pure tin in its
products
• RoHS compliant
Applications
•
•
•
•
•
Frequency synthesis
Clock recovery
Phase-lock loop (PLL) applications
Telecommunication
Applications requiring frequency modulation or
electronic control of the oscillator frequency
Q-Tech offers custom design VCXOs in SMT packages
(QT78, QT88) at 3.3 Vdc and 5.0Vdc up to 72MHz. Please
contact Q-Tech for details.
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-t ec h.com
Voltage Controlled (VCXO) (Revision B, July 2008) (ECO# 9386)
1
VOLTAGE CONTROLLED (VCXO)
Electrical Characteristics
Parameters
Output freq. range (Fo)
(See note 1)
Supply voltage (Vcc)
(See note 2)
Freq. stability (∆F/∆T)
Operating temp. (Topr)
Storage temp. (Tsto)
Operating supply current
(No Load)
Symmetry
(See note 3)
Rise and Fall times (Tr/Tf)
(with typical load)
QT6, 18, 41, 42
QT50
QT57
QT24
QT62
QT75
CORPORATION
Q-TECH
CRYSTAL CLOCK OSCILLATORS
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
ACMOS
HCMOS
TTL
SINE
ECL
PECL
375kHz — 70MHz
375kHz — 70MHz
1kHz — 70MHz
375kHz — 27MHz
1kHz — 155.52MHz
1kHz — 70MHz
1MHz — 27MHz
15MHz — 70MHz
5.0Vdc ± 10%
1MHz — 27MHz
N/A
1MHz — 155.52MHz
N/A
N/A
N/A
See Option codes
See Option codes
-62ºC to + 125ºC
-5.2Vdc ± 5%
12MHz — 27MHz
N/A
12MHz — 155.52MHz
Please call
N/A
N/A
5.0Vdc ± 5% (PECL)
Control Voltage Vc (See note 4)
Frequency pulling (See note 5)
Transfer function (See note 6)
Linearity (See note 7)
Modulation bandwidth
Input impedance
Output logic
Harmonics (See note 8)
Subharmonics (See note 8)
Phase noise (typ.)
(See note 9)
Output Load
45/55% max. Fo < 12MHz
40/60% max. Fo~ 12MHz to 155.52MHz
6ns max. Fo < 30MHz
3ns max. Fo ~ 30MHz to 155.52MHz
15pF // 10kΩ
10TTL Fo < 20MHz
6TTL Fo ≥ 20 MHz
0V to 5Vdc
25 mA max. Fo <
35 mA max. Fo ~
45 mA max. Fo ~
65 mA max. Fo ~
20MHz
20MHz to < 30MHz
30MHz to < 70MHz
70MHz to 155.52MHz
65mA max.
65 mA max. Fo < 50MHz
85 mA max. Fo ~ 50MHz to 155.52MHz
40 / 60% max.
N/A
50Ω
± 100ppm min.
Positive
± 10% max.
up to 10kHz
N/A
0V to -5.2Vdc
3.5ns max. Fo < 125MHz
3.0ns max. Fo ~ 125MHz to 155.52MHz
50Ω into Vcc -2V
0V to 5Vdc
ACMOS
HCMOS
N/A
TTL
Notes: Custom designs are available with Q-Tech custom MCM part numbers.
1.
2.
3.
4.
5.
Start-up time
Sine, 0dBm min.
-20dBc max.
-30dBc max.
10Hz
-70dBc / Hz
100Hz
-95dBc / Hz
1kHz
-120dBc / Hz
10kHz
-135dBc / Hz
100kHz
-145dBc / Hz
10ms max.
> 10kΩ
10K / 10KHECL
N/A
PECL
Other frequencies and packages are available. Please contact for details.
Other supply voltages are available. Please contact for details.
Tighter symmetry is available other than 40/60% max.
Other Vc and bipolar control voltages are available. Please contact for details.
Wide frequency pulling is available up to ±500ppm min. APR is also available.
Q-TECH Corporation
-
6.
7.
8.
9.
-
Negative transfer function is available.
Better linearity than ±10% is available.
Harmonics better than -20dBc and subharmonics better than -30dBc are available.
Phase noise screening test is available.
-
www.q-te c h.c om
10150 W. Jefferson Boulevard, Culver City 90232
Tel: 310-836-7900 - Fax: 310-836-2157
Voltage Controlled (VCXO) (Revision B, July 2008) (ECO# 9386)
2
VOLTAGE CONTROLLED (VCXO)
Q-TECH
Package Configuration Versus Pin Connections
QT6V
QT41V
CORPORATION
CRYSTAL CLOCK OSCILLATORS
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
QT42V
Q-TECH
MCM
FREQ.
D/C S/N
QT50V
Q-TECH
MCM
FREQ.
D/C S/N
Q-TECH
P/N
FREQ.
D/C S/N
Q-TECH
MCM
FREQ.
D/C S/N
.200
MAX.
(5.08)
.200
MIN.
(5.08)
.018
(.457)
.600
(15.24)
.880
MAX.
(22.35)
.200
MAX.
(5.08)
.200
MIN.
(5.08)
.018
(.457)
.600
(15.24)
.800
(20.32)
MAX.
.200 MAX.
(5.08)
.200
MIN.
(5.08)
.018
(.457)
.600
(15.24)
.800
MAX.
(20.32)
.018
.200 MAX.
(5.08)
.250
MIN.
(6.35)
.020
(.508)
.020
(.508)
(.457)
ø .060
(ø 1.52)
1
1
7
4
.505
MAX.
(12.83)
1
4
.505 SQ. MAX.
.300
(7.62)
SQ.
(12.83)
.505 MAX.
.300 (12.83)
(7.62)
1
14
7
.300
8
(7.62)
.505
MAX.
(12.83)
.300
(7.62)
14
8
Vcc
GND
Out
Vc
14
7
8
1
.100
(2.54)
Vcc
GND
Out
Vc
14
7
8
1
8
Vcc
GND
Out
Vc
14
7
8
1
5
ø .080
(ø 2.03)
8
Vcc
GND
Out
Vc
5
8
4
5
1
QT57V
Q-TECH
P/N
FREQ.
D/C S/N
QT24V
6
QT62V
1 44
40
QT75V
Q-TECH
P/N
FREQ.
D/C S/N
12
Q-TECH
P/N
FREQ.
D/C S/N
1
34
2
4
+ 010
.550 - .005
(13.97
+.25
)
-.127
3
.200
MAX.
(5.08)
.250 MIN.
(6.35)
.018
(0.457)
.700
(17.78)
.980
(24.89)
MAX.
.120
MAX.
(3.05)
.085
MAX.
(2.16)
.350
(8.89
+010
-.005
+.25
)
-.127
.115 MAX
(2.92)
.060/.045
(1.52/1.14)
.625
SQ.
(15.88)
10
11
.010
(.254)
.025
(.635)
.050
(1.27)
(
.500
SQ.
(12.70
.050
(1.27)
.050
(1.27)
2
3
.050
(1.27)
.200
(5.08)
4
12
34
(
1
8
.805 MAX.
.600
(15.24)
16
9
(20.45)
1
20
.650
SQ.
(16.51)
1
.015
(.381)
Vcc
GND
Out
Vc
16
8
9
1
Vcc
GND
Out
Vc
13
10
11
12
6
Vcc
GND
Out
Vc
1 44
6, 12
34, 40
42
41
40
.050
(1.27)
Vcc
GND
Out
Vc
4
2
3
1
.100
(2.54)
Dimensions are in inches (mm)
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-t ec h.com
Voltage Controlled (VCXO) (Revision B, July 2008) (ECO# 9386)
3
VOLTAGE CONTROLLED (VCXO)
Q-TECH
Ordering Information
CORPORATION
CRYSTAL CLOCK OSCILLATORS
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
Model #
AC
HC
T
S
E
EH
PE
=
=
=
=
=
=
=
QTXXV — X — XX — M — 20.000MHz
ACMOS +5V
HCMOS +5V
TTL +5V
Sine +5V
10KECL -5.2V
10KHECL -5.2V
PECL +5V
1
4
5
6
9
10
11
12
Screened to
MIL-PRF-55310,level B
(Left blank if no screening)
Output frequency
=
=
=
=
=
=
=
=
±
±
±
±
±
±
±
±
100ppm
50ppm
25ppm
50ppm
50ppm
100ppm
50ppm
100ppm
at
at
at
at
at
at
at
at
0ºC
0ºC
-20ºC
-55ºC
-55ºC
-55ºC
-40ºC
-40ºC
to +70ºC
to +70ºC
to +70ºC
to +105ºC
to +125ºC
to +125ºC
to +85ºC
to +85ºC
Packaging Options
•
•
•
•
Standard packaging in black foam (DIP)
Standard packaging in a locked anti-static cardboard (QT24)
Standard packaging anti-static plastic tube (QT75)
Optional Tape and Reel
• Lead forming available on all packages. Please contact for
details.
• Solder Dip Sn/Pb 60/40%
• P. I. N. D. test
• Lead trimming
• J-leads attached (QT75)
Other Options Available For An Additional Charge
Specifications subject to change without prior notice.
Nominal Frequency (Fo):
Output frequency at center control voltage Vc.
Control Voltage:
The available voltage range at the input of the VCXO to vary the frequency (i.e., 0 - 5V, ±4V, etc.).
Deviation (pull range):
The change in the output frequency as a function of control voltage.
Transfer Function (sense):
Direction of change in frequency as a function of control voltage.
Temperature Range:
Operating temperature range.
Stability vs. Temperature:
Percentage, or ppm, change of output frequency with respect to the temperature range at a constant
control voltage.
•
Input Impedance:
A measure of isolation between the VCXO internal frequency control network and the control voltage source.
•
Linearity:
The deviation from the best straight line slope of the frequency vs. control voltage plot.
•
Modulation Bandwidth (rate):
The maximum allowable rate of change of the control voltage.
•
•
•
•
•
•
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-t ec h.com
Voltage Controlled (VCXO) (Revision B, July 2008) (ECO# 9386)
Key parameters of a VCXO:
4
VOLTAGE CONTROLLED (VCXO)
Q-TECH
Frequency vs. Temperature Curve
40,008,000
40,006,000
CORPORATION
CRYSTAL CLOCK OSCILLATORS
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
QT6VHC-40MHz INTEGRAL LINEARITY AND PULLABILITY Vc=0V to 5Vdc
5%
4%
3%
5%
4%
3%
2%
QT58VHC-32MHz PULLING AND INTEGRAL LINEARITY
300
250
200
Frequency Pulling, ppm
90
40,004,000
Output Frequency, Hz
Integral Linearity, %
2%
40,002,000
1%
0%
-1%
-2%
39,996,000
-3%
39,994,000
-4%
-5%
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
-3%
Integral Linearity, %
150
100
1%
0%
-1%
-2%
-150
-200
-4%
-5%
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
-250
-300
50
0
40,000,000
-50
-100
39,998,000
39,992,000
Vc (V)
SN1
SN2
SN3
SN4
SN1 integral linearity
SN2 integral linearity
SN3 integral linearity
SN4 integral linearity
100.2°C Integral Linearity
25°C Integral Linearity
Vc (V)
-54.9°C Integral Linearity
2 100.2°C centered
2 25°C centered
2 -54.9°C centered
WIDE PULL VCXO QT957S - 16MHZ
600
500
400
Frequency Deviation, PPM
Frequency Deviation, PPM
300
200
100
0
-100
-200
-300
-400
-500
-600
0
0.25 0.5 0.75
1
1.25 1.5 1.75
2
2.25 2.5 2.75
3
3.25 3.5 3.75
4
4.25 4.5 4.75
5
5.25 5.5 5.75
Applied Vc, volts
3721
3737
3739
3722
3723
3724
3725
3727
3728
3731
3732
3734
3735
3736
3738
WIDE PULL VCXO QT957S-16MHz FREQUENCY STABILITY VS. TEMPERATURE
50
40
30
20
10
0
-10
-20
-30
-40
-50
-45 -40 -35 -30 -25 -20 -15 -10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Temp (°C)
8%
6%
QT75VHC-54.04MHz FREQUENCY PULLING AND LINEARITY VC=0V TO 5Vdc
400
300
4%
Frequency Pulling, PPM
200
Integral Linearity, %
2%
100
0%
0
-2%
-100
-4%
-200
-6%
-8%
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
-300
Output Waveform (Typical)
SYMMETRY =
TH
T
Tr
VOH
Tf
Vdd
0.9xVdd
x 100%
VC (V)
Test Circuit
Typical test circuit for VCXO CMOS logic
+ mA
+
Power
Supply
-
+
Vdc
-
Vcc Out
0.1µF
or
Vc
0.01µF
DUT
GND
15pF
(*)
10k
Output
0.5xVdd
0.1xVdd
VOL
TH
T
GND
Ground
Vc
(*) CL includes probe and jig capacitance
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-t ec h.com
Voltage Controlled (VCXO) (Revision B, July 2008) (ECO# 9386)
5
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