Q-Tech VCXO User Manual

Q-TECH

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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 : [phone] - 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.

1

VOLTAGE CONTROLLED (VCXO)

Q-TECH

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-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.

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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)

2

Q-TECH

1 7

814

Q-TECH
P/N
FREQ.
D/C S/N

(22.35)

(15.24)

.880

.600

.300

(7.62)

(2.54)

.100

.505

(12.83)

MAX.

(.457)

.018

MIN.

(5.08)

.200

.200

(5.08)

MAX.

MAX.

14 8

71

FREQ.
D/C S/N

MCM

Q-TECH

.600

(15.24)

(7.62)

.300

.200

(5.08)

MAX.

MIN.

(5.08)

.200

(.457)

.018

MAX.

(20.32)

.800

.505

(12.83)

MAX.

Q-TECH
MCM

.600

.800

.200

.505

.300

.200

.018

FREQ.
D/C S/N

(12.83)

(7.62)

MAX.

(5.08)

MAX.

(5.08)

MIN.

(.457)

(20.32)

MAX.

(15.24)

14

58

ø .080

(ø 2.03)

.020

(.508)

14

58

Q-TECH
MCM
FREQ.
D/C S/N

.200

(5.08)

.250

(6.35)

(.508)

.020

(7.62)

.300

.505

(12.83)

(.457)

.018

MAX.

MIN.

SQ. MAX.

SQ.

ø .060

(ø 1.52)

(5.08)

.200

.250

(6.35)

.018

(0.457)

.100

(2.54)

.700

(17.78)

.980

(24.89)

.600

(15.24)

(20.45)

.805

FREQ.

P/N

Q-TECH

D/C S/N

81

16 9

MAX.

MIN.

MAX.

MAX.

1

10 11

20

Q-TECH
P/N
FREQ.

.120

(3.05)

(1.52/1.14)

.060/.045 .010

(.254)

(15.88)

.625

(

(

.050

(1.27)

(.381)

.015

MAX.

SQ.

D/C S/N

12

Q-TECH
P/N
FREQ.
D/C S/N

34

40

4416

(2.16)

.085

(.635)

.025

.500

(12.70

.050

(1.27)

(16.51)

.650

34

6144

40

(1.27)

.050

SQ.

SQ.

12

MAX.

+010

-.005

.350

1

- .005

.550

+ 010

.200

.050

1

2

3

2

4 3

+.25

-.127

(8.89 )

+.25

-.127

(13.97 )

(5.08)

(1.27)

.115 MAX

(2.92)

4

Q-TECH
P/N
FREQ.
D/C S/N

SQ. (4x)

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Package Configuration Versus Pin Connections

Package Configuration Versus Pin Connections

VOLTAGE CONTROLLED (VCXO)

CRYSTAL CLOCK OSCILLATORS

-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz

QT6V

Vcc 14

GND 7

Out 8

Vc 1

QT57V

QT41V

Vcc 14

GND 7

Out 8

Vc 1

QT24V

QT42V

Vcc 14

GND 7

Out 8

Vc 1

QT62V

QT50V

Vcc 8

GND 4

Out 5

Vc 1

QT75V

GND 8

Q-TEC H C orp ora tio n - 101 50 W. Jefferson Bou lev ard , C ulv er City 90232 - Tel : [phone] - F ax: 3 10- 836 -21 57 - ww w.q-te ch .co m

Voltage Controlled (VCXO) (Revision E, August 2010 ) (ECO# 9940)

Vcc 16

Out 9

Vc 1

Vcc 13

GND 10

Out 11

Vc 12

Dimensions are in inches (mm)

Vcc 6, 12

GND 34, 40

Out 42

Vc 41

Vcc 4

GND 2

Out 3

Vc 1

3

Q-TECH

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Ordering Information

VOLTAGE CONTROLLED (VCXO)

CRYSTAL CLOCK OSCILLATORS

-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz

Sample part number

QT50VAC9M-20. 0 0 0 M H z

QT 50 V AC 9M-20.000MHz

T = Standard
S = Solder Dip (*)

Model #
(See page 3)

Screened to
MIL-PRF-55310,level B
(Left blank if no screening

Output frequency

)

AC = ACMOS +5V
HC = HCMOS +5V
T = TTL +5V
S = Sine +5V
E = 10KECL -5.2V
EH = 10KHECL -5.2V
PE = PECL +5V

1 = ± 100ppm at 0ºC to +70ºC
4 = ± 50ppm at 0ºC to +70ºC
5 = ± 25ppm at -20ºC to +70ºC
6 = ± 50ppm at -55ºC to +105ºC

9 = ± 50ppm at -55ºC to +125ºC
10 = ± 100ppm at -55ºC to +125ºC
11 = ± 50ppm at -40ºC to +85ºC
12 = ± 100ppm at -40ºC to +85ºC

Packaging Options Other Options Available For An Additional Charge

• 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.

• (*) Hot Solder Dip Sn60 per MIL-PRF 55310

• P. I. N. D. test (MIL-STD 883, Method 2020)

• Lead trimming

• J-leads attached (QT75)

Specifications subject to change without prior notice.

Key parameters of a VCXO:

• 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-TEC H C orp ora tio n - 101 50 W. Jefferson Bou lev ard , C ulv er City 90232 - Tel : [phone] - F ax: 3 10- 836 -21 57 - ww w.q-te ch .co m

Voltage Controlled (VCXO) (Revision E, August 2010 ) (ECO# 9940)

4

Q-TECH

39,992,000

39,994,000

39,996,000

39,998,000

40,000,000

40,002,000

40,004,000

40,006,000

40,008,000

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Vc (V)

Output Frequency, Hz

-5%

-4%

-3%

-2%

-1%

0%

1%

2%

3%

4%

5%

Integral Linearity, %

5

SN1 SN2 SN3 SN4 SN1 integral linearity SN2 integral linearity SN3 integral linearity SN4 integral linearity

-600

-500

-400

-300

-200

-100

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

Frequency Deviation, PPM

0

3721 3737 3739 3722 3723 3724 3725 3727 3728 3731 3732 3734 3735 3736 3738

0

-50

-40

-30

-20

-10

10

20

30

40

50

-45 -40 -35 -30 -25 -20 -15 -10 -5 0510 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Temp (°C)

Frequency Deviation, PPM

-8%

-6%

-4%

-2%

0%

2%

4%

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

VC (V)

Integral Linearity, %

-300

-200

-100

100

200

300

400

Frequency Pulling, PPM

0

Vdd

GND

0.1xVdd

0.9xVdd

VOH

VOL

Tr Tf

TH

T

0.5xVdd

SYMMETRY = x 100%

TH

T

0

-5%

-4%

-3%

-2%

-1%

0%

1%

2%

3%

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

Vc (V)

Integral Linearity, %

-300

-250

-200

-150

-100

-50

50

100

150

200

250

300

Frequency Pulling, ppm

100.2°C Integral Linearity 25°C Integral Linearity -54.9°C Integral Linearity 2 100.2°C centered 2 25°C centered 2 -54.9°C centered

-

-

Output

Ground

Vcc

DUT

Out

GND

0.1µF

15pF

Vc

Vc

Power
Supply

10k

mA

Vdc

+

+

+

(*)

or

0.01µF

(*) CL includes probe and jig capacitance

Typical test circuit for VCXO CMOS logic

COR PORATI ON

Frequency vs. Temperature Curve

QT6VHC-40MHz INTEGRAL LINEARITY AND PULLABILITY Vc=0V to 5Vdc QT58VHC-32MHz PULLING AND INTEGRAL LINEARITY

VOLTAGE CONTROLLED (VCXO)

CRYSTAL CLOCK OSCILLATORS

-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz

WIDE PULL VCXO QT957S - 16MHZ

Output Waveform (Typical)

WIDE PULL VCXO QT957S-16MHz FREQUENCY STABILITY VS. TEMPERATURE

QT75VHC-54.04MHz FREQUENCY PULLING AND LINEARITY VC=0V TO 5Vdc

Test Circuit

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Voltage Controlled (VCXO) (Revision E, August 2010 ) (ECO# 9940)

5

Q-TECH

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Phase Noise and Phase Jitter Integration

VOLTAGE CONTROLLED (VCXO)

CRYSTAL CLOCK OSCILLATORS

-5.2Vdc & 5.0Vdc - 1kHz to 155.52MHz

QT25VT, 29.5MHz

QT50VAC, 31.9488MHz

Period Jitter

QT6VHC10M, 16MHz

QT25VT, 29.5MHz

Environmental Specifications

Q-Tech Standard Screening/QCI (MIL-PRF55310) is available for all of our VCXO packages. Q-Tech can also customize screening
and test procedures to meet your specific requirements. The units are designed and processed to exceed the following test conditions:

Environmental Test Test Conditions

Temperature cycling MIL-STD-883, Method 1010, Cond. B
Constant acceleration MIL-STD-883, Method 2001, Cond. A, Y1
Seal: Fine and Gross Leak MIL-STD-883, Method 1014, Cond. A and C
Burn-in 160 hours, 125°C with load
Aging 30 days, 70°C, ± 1.5ppm max
Vibration sinusoidal MIL-STD-202, Method 204, Cond. D
Shock, non operating MIL-STD-202, Method 213, Cond. I
Thermal shock, non operating MIL-STD-202, Method 107, Cond. B
Ambient pressure, non operating MIL-STD-202, 105, Cond. C, 5 minutes dwell time minimum
Resistance to solder heat MIL-STD-202, Method 210, Cond. B or C
Moisture resistance MIL-STD-202, Method 106
Terminal strength MIL-STD-202, Method 211, Cond. C
Resistance to solvents MIL-STD-202, Method 215
Solderability MIL-STD-202, Method 208
ESD Classification MIL-STD-883, Method 3015, Class 1 HBM 0 to 1,999V
Moisture Sensitivity Level J-STD-020, MSL=1

Please contact Q-Tech for higher shock requirements

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Voltage Controlled (VCXO) (Revision E, August 2010 ) (ECO# 9940)

6