TCXO Sine Wave Oscillators

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Manufacturers
    • Abracon
    • Cts
    • Diodes Incorporated
    • Ecs International
    • Iqd Frequency Products
    • Jauch Quartz
    • Microchip Technology
    • Murata Manufacturing
    • Nihon Dempa Kogyo
    • Raltron Electronics
    • Seiko Epson
    • Sitime
    • Tai-saw Technology
    • Taitien Electronics
    • Txc
Oscillator Type
    • CLIPPED SINE
    • SINE
Mounting Feature
    • SURFACE MOUNT
    • THROUGH HOLE MOUNT
No. of Terminals
    • 10
    • 4
    • 6
    • 8
Frequency Stability
    • .05 %
    • .1 %
    • .2 %
    • .28 %
    • .5 %
    • 1 %
    • 1.5 %
    • 2 %
    • 2.5 %
    • 3 %
    • 5 %
Frequency Adjustment (Mechanical)
    • NO
    • YES
Aging
    • 0.3 PPM/YEAR
    • 0.5 PPM/FIRST YEAR
    • 0.5 PPM/YEAR
    • 1 PPM/FIRST YEAR
    • 1 PPM/YEAR
    • 1.5 PPM/FIRST YEAR
Package Body Material
    • CERAMIC
    • PLASTIC/EPOXY
Maximum Supply Voltage
    • 1.26 V
    • 1.575 V
    • 1.83 V
    • 1.89 V
    • 1.9 V
    • 1.98 V
    • 2.52 V
    • 2.625 V
    • 2.63 V
    • 2.75 V
    • 2.835 V
    • 2.8875 V
    • 2.94 V
    • 2.97 V
    • 2.9925 V
    • 3.15 V
    • 3.3 V
    • 3.46 V
    • 3.465 V
    • 3.47 V
    • 3.63 V
    • 5.25 V
Technology
    • CLIPPED SINE
Screening Level
    • AEC-Q100/200
    • IATF 16949
Output Impedance
    • 10000 ohm
    • 11000 ohm
    • 20000 ohm
Maximum Supply Current
    • 1.4 mA
    • 1.5 mA
    • 1.8 mA
    • 10 mA
    • 2 mA
    • 2.5 mA
    • 3.4 mA
Nominal Supply Voltage
    • 1.2 V
    • 1.5 V
    • 1.8 V
    • 2.4 V
    • 2.5 V
    • 2.7 V
    • 2.75 V
    • 2.8 V
    • 2.85 V
    • 3 V
    • 3.3 V
    • 5 V
Power Supplies (V)
    • 1.8
    • 2.4
    • 2.5
    • 2.7
    • 2.75
    • 2.8
    • 2.85
    • 3
    • 3.3
Package Equivalence Code
    • DILCC4,.08,75
    • DILCC4,.1,104
    • DILCC4,.12,154
    • DILCC4,.13,157
    • DILCC8,.12,55/47
    • LCC4, .08X.06,65/44
    • LCC4, 08X0.1, 55/82
    • LCC4,.06X.08,28/25
    • LCC4,.06X.08,50/38
    • LCC4,.06X.08,59/46
    • LCC4,.06X.08,62/46
    • LCC4,.06X.08,63/40
    • LCC4,.06X.08,63/51
    • LCC4,.08X.1,77/53
    • LCC4,.08X.1,80/53
    • LCC4,.1X.12,91/67
    • LCC4,.1X.13,83/65
    • LCC6,.1X.08,85/51
    • SOLCC6,.08,37
Sub-Category
    • Other Oscillators
Physical Dimension
    • 18.5mm x 11.8mm x 10mm
    • 2.0mm x 1.6mm x 0.73mm
    • 2.0mm x 1.6mm x 0.7mm
    • 2.0mm x 1.6mm x 0.8mm
    • 2.5mm X 2.0mm X 0.7mm
    • 2.5mm x 2.0mm x 0.8mm
    • 2.5mm x 2.0mm x 0.9mm
    • 2.5mm x 2mm x 0.8mm
    • 2mm x 1.6mm x 0.73mm
    • 2mm x 1.6mm x 0.8mm
    • 3.2mm x 2.5mm x 0.9mm
    • 3.2mm x 2.5mm x 1.0mm
    • 3.2mm x 2.5mm x 1.2mm
    • 5.0mm x 3.2mm x 1.5mm
    • 5.0mm x 3.2mm x 1.6mm
    • 5.0mm x 3.2mm x 2.0mm
    • 5.15mm x 3.35mm x 1.06mm
    • 5mm x 3.2mm x 2mm
    • 7.0mm x 5.0mm x 2.0mm
Minimum Supply Voltage
    • 1.14 V
    • 1.425 V
    • 1.62 V
    • 1.68 V
    • 1.7 V
    • 1.71 V
    • 1.77 V
    • 1.8 V
    • 2.25 V
    • 2.28 V
    • 2.3575 V
    • 2.375 V
    • 2.38 V
    • 2.565 V
    • 2.6125 V
    • 2.66 V
    • 2.7 V
    • 2.7075 V
    • 2.85 V
    • 2.97 V
    • 3.135 V
    • 3.14 V
    • 4.75 V
Maximum Operating Temperature
    • 55 Cel
    • 60 Cel
    • 70 Cel
    • 75 Cel
    • 80 Cel
    • 85 Cel
Minimum Operating Temperature
    • -10 Cel
    • -15 Cel
    • -20 Cel
    • -30 Cel
    • -40 Cel
    • 0 Cel
Terminal Finish
    • GOLD
    • GOLD OVER NICKEL
    • Gold (Au)
    • Gold (Au) - with Nickel (Ni) barrier
    • Nickel/Gold (Ni/Au)
    • TIN SILVER COPPER OVER NICKEL
    • Tin/Lead (Sn/Pb)
Nominal Operating Frequency
    • 10 MHz
    • 10.24 MHz
    • 12.8 MHz
    • 16 MHz
    • 16.367667 MHz
    • 16.369 MHz
    • 16.384 MHz
    • 16.777216 MHz
    • 19.2 MHz
    • 19.44 MHz
    • 20 MHz
    • 24 MHz
    • 25 MHz
    • 26 MHz
    • 27 MHz
    • 30 MHz
    • 32 MHz
    • 38.4 MHz
    • 40 MHz
    • 48 MHz
    • 50 MHz
    • 52 MHz
Manufacturer Series
    • JT255
    • S5200
    • WT255
Qualification
    • Not Qualified
Output Level
    • .8 V
    • 1 V
Additional Features
    • BULK
    • BULK; TR, 7 INCH
    • ENABLE/DISABLE FUNCTION; TR
    • SUPPLY VOLTAGE 2.8V AND 3V ALSO AVAILABLE
    • TAPE
    • TAPE AND REEL
    • TR
    • TR, 13 INCH
    • TR, 7 INCH
    • TR, PLASTIC, 10 INCH
JESD-609 Code
    • e0
    • e4
Minimum Operating Frequency
    • 12.6 MHz
    • 13 MHz
    • 8.4672 MHz
Maximum Operating Frequency
    • 26 MHz
    • 34.368 MHz
    • 52 MHz
Reset All
Part RoHS Manufacturer Oscillator Type Mounting Feature No. of Terminals Frequency Stability Frequency Adjustment (Mechanical) Aging Package Body Material Maximum Supply Voltage Technology Screening Level Output Impedance Maximum Supply Current Nominal Supply Voltage Power Supplies (V) Package Equivalence Code Sub-Category Physical Dimension Minimum Supply Voltage Maximum Operating Temperature Minimum Operating Temperature Terminal Finish Nominal Operating Frequency Manufacturer Series Qualification Output Level Additional Features JESD-609 Code Minimum Operating Frequency Maximum Operating Frequency

JT325FA0019.200000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

.5 %

NO

1 PPM/FIRST YEAR

2.8875 V

10000 ohm

2.75 V

3.2mm x 2.5mm x 1.0mm

2.6125 V

70 Cel

-20 Cel

19.2 MHz

.8 V

WT255GO0025.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2.5 %

NO

1 PPM/FIRST YEAR

2.52 V

11000 ohm

2.4 V

2.5mm x 2.0mm x 0.8mm

2.28 V

75 Cel

-30 Cel

25 MHz

.8 V

WT3252A0026.000000

Diodes Incorporated

JT2551O0026.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

3.465 V

10000 ohm

1.5 mA

3.3 V

3.3

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

3.135 V

75 Cel

-30 Cel

26 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT325CG0010.240000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.94 V

10000 ohm

2.8 V

3.2mm x 2.5mm x 1.0mm

2.66 V

85 Cel

-30 Cel

10.24 MHz

.8 V

WT2551B0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

3.465 V

11000 ohm

3.3 V

2.5mm x 2.0mm x 0.8mm

3.135 V

70 Cel

-20 Cel

16.369 MHz

.8 V

JT2551Y0040.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

5 %

NO

1 PPM/FIRST YEAR

CERAMIC

3.465 V

10000 ohm

2 mA

3.3 V

3.3

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

3.135 V

75 Cel

-30 Cel

40 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT2553H0026.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

1.89 V

10000 ohm

1.5 mA

1.8 V

1.8

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

1.71 V

85 Cel

-30 Cel

26 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT325EB0052.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.9925 V

10000 ohm

2.85 V

3.2mm x 2.5mm x 1.0mm

2.7075 V

70 Cel

-20 Cel

52 MHz

.8 V

JT325BX0010.240000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

5 %

NO

1 PPM/FIRST YEAR

3.15 V

10000 ohm

3 V

3.2mm x 2.5mm x 1.0mm

2.85 V

85 Cel

-30 Cel

10.24 MHz

.8 V

JT325CL0025.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.94 V

10000 ohm

2.8 V

3.2mm x 2.5mm x 1.0mm

2.66 V

75 Cel

-30 Cel

25 MHz

.8 V

JT325GC0052.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.52 V

10000 ohm

2.4 V

3.2mm x 2.5mm x 1.0mm

2.28 V

70 Cel

-20 Cel

52 MHz

.8 V

WT3254L0019.200000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

1.575 V

10000 ohm

1.5 V

3.2mm x 2.5mm x 1.2mm

1.425 V

75 Cel

-30 Cel

19.2 MHz

.8 V

JT2552C0019.200000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.625 V

10000 ohm

1.5 mA

2.5 V

2.5

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.375 V

70 Cel

-20 Cel

19.2 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT255DO0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.835 V

10000 ohm

1.5 mA

2.7 V

2.7

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.565 V

75 Cel

-30 Cel

16.369 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT325CG0025.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.94 V

10000 ohm

2.8 V

3.2mm x 2.5mm x 1.0mm

2.66 V

85 Cel

-30 Cel

25 MHz

.8 V

JT325CB0010.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.94 V

10000 ohm

2.8 V

3.2mm x 2.5mm x 1.0mm

2.66 V

70 Cel

-20 Cel

10 MHz

.8 V

JT325BC0052.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

3.15 V

10000 ohm

3 V

3.2mm x 2.5mm x 1.0mm

2.85 V

70 Cel

-20 Cel

52 MHz

.8 V

WT2552C0016.367667

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.625 V

11000 ohm

2.5 V

2.5mm x 2.0mm x 0.8mm

2.375 V

70 Cel

-20 Cel

16.367667 MHz

.8 V

WT325DH0016.367667

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.835 V

10000 ohm

2.7 V

3.2mm x 2.5mm x 1.2mm

2.565 V

85 Cel

-30 Cel

16.367667 MHz

.8 V

WT325BZ0016.367667

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

5 %

NO

1 PPM/FIRST YEAR

3.15 V

10000 ohm

3 V

3.2mm x 2.5mm x 1.2mm

2.85 V

85 Cel

-40 Cel

16.367667 MHz

.8 V

WT3252P0016.367667

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

.5 %

NO

1 PPM/FIRST YEAR

2.625 V

10000 ohm

2.5 V

3.2mm x 2.5mm x 1.2mm

2.375 V

85 Cel

-40 Cel

16.367667 MHz

.8 V

JT255CR0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.94 V

10000 ohm

1.5 mA

2.8 V

2.8

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.66 V

85 Cel

-40 Cel

16.369 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT255GS0040.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.52 V

10000 ohm

2 mA

2.4 V

2.4

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.28 V

85 Cel

-40 Cel

40 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT255EL0040.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.9925 V

10000 ohm

2 mA

2.85 V

2.85

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.7075 V

75 Cel

-30 Cel

40 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT3251K0010.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

.5 %

NO

1 PPM/FIRST YEAR

3.465 V

10000 ohm

3.3 V

3.2mm x 2.5mm x 1.0mm

3.135 V

75 Cel

-30 Cel

10 MHz

.8 V

JT3253H0010.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

1.89 V

10000 ohm

1.8 V

3.2mm x 2.5mm x 1.0mm

1.71 V

85 Cel

-30 Cel

10 MHz

.8 V

JT325GI0026.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2 %

NO

1 PPM/FIRST YEAR

2.52 V

10000 ohm

2.4 V

3.2mm x 2.5mm x 1.0mm

2.28 V

85 Cel

-30 Cel

26 MHz

.8 V

WT255FJ0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2.5 %

NO

1 PPM/FIRST YEAR

2.8875 V

11000 ohm

2.75 V

2.5mm x 2.0mm x 0.8mm

2.6125 V

85 Cel

-30 Cel

16.369 MHz

.8 V

JT255GE0040.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.52 V

10000 ohm

2 mA

2.4 V

2.4

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.28 V

70 Cel

-20 Cel

40 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT255DC0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.835 V

10000 ohm

1.5 mA

2.7 V

2.7

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.565 V

70 Cel

-20 Cel

16.369 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT325CH0010.240000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.94 V

10000 ohm

2.8 V

3.2mm x 2.5mm x 1.0mm

2.66 V

85 Cel

-30 Cel

10.24 MHz

.8 V

WT255BA0040.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

.5 %

NO

1 PPM/FIRST YEAR

3.15 V

11000 ohm

3 V

2.5mm x 2.0mm x 0.8mm

2.85 V

70 Cel

-20 Cel

40 MHz

.8 V

WT2554B0025.000000

Diodes Incorporated

CLIPPED SINE

WT255

WT255CR0026.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.97 V

11000 ohm

2.8 V

2.5mm x 2.0mm x 0.8mm

2.66 V

85 Cel

-40 Cel

26 MHz

.8 V

JT3252R0010.240000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.625 V

10000 ohm

2.5 V

3.2mm x 2.5mm x 1.0mm

2.375 V

85 Cel

-40 Cel

10.24 MHz

.8 V

JT325EM0052.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.9925 V

10000 ohm

2.85 V

3.2mm x 2.5mm x 1.0mm

2.7075 V

75 Cel

-30 Cel

52 MHz

.8 V

JT325GR0010.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1.5 %

NO

1 PPM/FIRST YEAR

2.52 V

10000 ohm

2.4 V

3.2mm x 2.5mm x 1.0mm

2.28 V

85 Cel

-40 Cel

10 MHz

.8 V

JT255BP0013.000000

Diodes Incorporated

CLIPPED SINE

JT255

WT255EI0026.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2 %

NO

1 PPM/FIRST YEAR

2.9925 V

11000 ohm

2.85 V

2.5mm x 2.0mm x 0.8mm

2.3575 V

85 Cel

-30 Cel

26 MHz

.8 V

WT2554D0026.000000

Diodes Incorporated

CLIPPED SINE

WT255

WT255BF0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

.5 %

NO

1 PPM/FIRST YEAR

3.15 V

11000 ohm

3 V

2.5mm x 2.0mm x 0.8mm

2.85 V

85 Cel

-30 Cel

16.369 MHz

.8 V

WT255CQ0010.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.97 V

11000 ohm

2.8 V

2.5mm x 2.0mm x 0.8mm

2.66 V

85 Cel

-40 Cel

10 MHz

.8 V

WT255EG0010.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.9925 V

11000 ohm

2.85 V

2.5mm x 2.0mm x 0.8mm

2.3575 V

85 Cel

-30 Cel

10 MHz

.8 V

WT2552B0025.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

1 %

NO

1 PPM/FIRST YEAR

2.625 V

11000 ohm

2.5 V

2.5mm x 2.0mm x 0.8mm

2.375 V

70 Cel

-20 Cel

25 MHz

.8 V

WT2553T0026.000000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2.5 %

NO

1 PPM/FIRST YEAR

1.89 V

11000 ohm

1.8 V

2.5mm x 2.0mm x 0.8mm

1.71 V

85 Cel

-40 Cel

26 MHz

.8 V

JT255CN0016.369000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

2 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.94 V

10000 ohm

1.5 mA

2.8 V

2.8

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.66 V

75 Cel

-30 Cel

16.369 MHz

Not Qualified

.8 V

13 MHz

52 MHz

JT2552F0019.200000

Diodes Incorporated

CLIPPED SINE

SURFACE MOUNT

4

.5 %

NO

1 PPM/FIRST YEAR

CERAMIC

2.625 V

10000 ohm

1.5 mA

2.5 V

2.5

DILCC4,.08,75

Other Oscillators

2.5mm x 2.0mm x 0.8mm

2.375 V

85 Cel

-30 Cel

19.2 MHz

Not Qualified

.8 V

13 MHz

52 MHz
TCXO Sine Wave Oscillators

TCXO (Temperature Compensated Crystal Oscillator) sine wave oscillators are electronic devices that generate a stable sine wave signal for use in various applications, such as communication systems, test and measurement equipment, and frequency synthesizers. They use a crystal oscillator as a frequency reference and a temperature compensation circuit to stabilize the oscillator frequency.

The TCXO sine wave oscillator works by using a temperature compensation circuit to adjust the frequency of the crystal oscillator, compensating for changes in temperature that can affect the oscillator frequency. This results in a stable and accurate sine wave signal output.

An advantages of TCXO sine wave oscillators is their high stability and accuracy over a wide temperature range. They can generate sine wave signals with very low frequency drift and jitter, making them ideal for use in applications that require precise timing.