Q-Tech VCXO User Manual
Q-TECH
COR PORATI ON
Description
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.
Features
• 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
VOLTAGE CONTROLLED (VCXO)
CRYSTAL CLOCK OSCILLATORS
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
Applications
• Frequency synthesis
• Clock recovery
• Phase-lock loop (PLL) applications
• Telecommunication
• Applications requiring frequency modulation or
electronic control of the oscillator frequency
Q-TEC H C orp ora tio n - 101 50 W. Jefferson Bou lev ard , C ulv er City 90232 - Tel : 310 -83 6-7 900 - F ax: 3 10- 836 -21 57 - ww w.q-te ch .co m
Voltage Controlled (VCXO) (Revision E, August 2010 ) (ECO# 9940)
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.
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VOLTAGE CONTROLLED (VCXO)
Q-TECH
COR PORATI ON
-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz
CRYSTAL CLOCK OSCILLATORS
Electrical Characteristics
Parameters ACMOS HCMOS TTL
QT6, 18, 41, 42
QT50
Output freq. range (Fo)
(See note 1)
Supply voltage (Vcc) (See note 2) 5.0Vdc ± 10% -5.2Vdc ± 5% 5.0Vdc ± 5% (PECL)
Maximum Applied Voltage (Vdd max.)
Freq. stability (∆F/∆T) See Option codes
Operating temp. (Topr) See Option codes
Storage temp. (Tsto) -62ºC to + 125ºC
Operating supply current
(No Load)
Symmetry
(See note 3)
Rise and Fall times (Tr/Tf)
(with typical load)
Output Load
Control Voltage Vc (See note 4) 0V to 5Vdc
Frequency pulling (See note 5)
Transfer function (See note 6)
Linearity (See note 7) ± 10% max.
Modulation bandwidth
Input impedance
Output logic ACMOS
Harmonics (See note 8)
Subharmonics (See note 8) N/A
Phase noise (typ.)
(See note 9)
Start-up time 10ms max.
QT57
QT24
QT62
QT75
375kHz — 70MHz
375kHz — 27MHz
1kHz — 155.52MHz
375kHz — 70MHz 1kHz — 70MHz
1MHz — 27MHz
15MHz — 70MHz
25 mA max. Fo < 20MHz
35 mA max. Fo ~ 20MHz to < 30MHz
45 mA max. Fo ~ 30MHz to < 70MHz
65 mA max. Fo ~ 70MHz to 155.52MHz
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
HCMOS TTL
Notes: Custom designs are available with Q-Tech custom MCM part numbers.
1. Other frequencies and packages are available. Please contact for details.
2. Other supply voltages are available. Please contact for details.
3. Tighter symmetry is available other than 40/60% max.
4. Other Vc and bipolar control voltages are available. Please contact for details.
5. Wide frequency pulling is available up to ±500ppm min. APR is also available.
Q-T ECH Corporation - 10 150 W. Jefferson Boulevard, Culver City 902 32 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech .c om
1kHz — 70MHz
-0.5 to +7.0Vdc
6TTL Fo ≥ 20 MHz
± 100ppm min.
Positive
up to 10kHz
> 10kΩ
10Hz -70dBc / Hz
100Hz -95dBc / Hz
1kHz -120dBc / Hz
10kHz -135dBc / Hz
100kHz -145dBc / Hz
SINE ECL
1MHz — 27MHz 12MHz — 27MHz
N/A
1MHz — 155.52MHz 12MHz — 155.52MHz
N/A
N/A N/A
N/A
0 to -8.0Vdc
65mA max. 65 mA max. Fo < 50MHz
N/A
N/A
50Ω 50Ω into Vcc -2V
Sine, 0dBm min.
-20dBc max.
-30dBc max.
85 mA max. Fo ~ 50MHz to 155.52MHz
3.5ns max. Fo < 125MHz
3.0ns max. Fo ~ 125MHz to 155.52MHz
0V to -5.2Vdc
10K / 10KHECL
N/A
Please call
N/A
40 / 60% max.
N/A
PECL
-0.5 to +7.0Vdc
0V to 5Vdc
PECL
6. Negative transfer function is available.
7. Better linearity than ±10% is available.
8. Harmonics better than -20dBc and subharmonics better than -30dBc are available.
9. Phase noise screening test is available.
Voltage Controlled (VCXO) (Revision E, August 2010 ) (ECO# 9940)
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