LTC6908-1/LTC6908-2

4

690812fa

TEMPERATURE (

°C)

–40

20

60

690812 G06

–20

0

40

800

400

450

500

550

600

650

700

750

80

FREQUENCY = 1MHz

SSFM DISABLED

10k

5

4

3

2

1

0

–1

–2

–3

–4

–5

100k

1M

10M

690812 G01

TYPICAL MAX

GUARANTEED MAX

OVER TEMPERATURE

GUARANTEED MIN

OVER TEMPERATURE

TYPICAL MIN

10k

5

4

3

2

1

0

–1

–2

–3

–4

–5

100k

1M

10M

690812 G02

TYPICAL MAX

GUARANTEED MAX

OVER TEMPERATURE

GUARANTEED MIN

OVER TEMPERATURE

TYPICAL MIN

TEMPERATURE (

°C)

–40

20

60

690812 G03

–20

0

40

1.00

0.75

0.50

0.25

0

–0.25

–0.50

–0.75

–1.00

80

TYPICAL MAX

TYPICAL MIN

FREQUENCY (Hz)

10k

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

100k

1M

10M

690812 G04

5V

3V

FREQUENCY (Hz)

10k

2.0

1.5

1.0

0.5

0

100k

1M

10M

690812 G05

5V SSFM DISABLED

3V SSFM DISABLED

5V SSFM ENABLED

3V SSFM ENABLED

Frequency Error vs Temperature

Peak to Peak Jitter vs Output

Frequency

Supply Current vs Output

Frequency

Supply Current vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: LTC6908C and LTC6908I are guaranteed functional over the

operating temperature range of –40°C to 85°C.

Note 3: LTC6908C is guaranteed to meet specified performance from

0°C to 70°C. The LTC6908C is designed, characterized and expected to

meet specified performance from –40°C to 85°C but is not tested or QA

sampled at these temperatures. The LTC6908I is guaranteed to meet

the specified performance limits from –40°C to 85°C. The LTC6908H is

guaranteed to meet the specified performance limits from –40°C to 125°C.

equation.

Note 5: Guaranteed by 5V test

Note 6: To conform to the Logic IC Standard, current out of a pin is

arbitrarily given a negative value.

Note 7: Output rise and fall times are measured between the 10% and the

90% power supply levels with no output loading. These specifications are

based on characterization.

Note 8: Long term drift on silicon oscillators is primarily due to the

movement of ions and impurities within the silicon and is tested at 30°C

under otherwise nominal operating conditions. Long term drift is specified

as ppm/√kHr due to the typically non-linear nature of the drift. To calculate

drift for a set time period, translate that time into thousands of hours, take

the square root and multiply by the typical drift number. For instance, a

year is 8.77kHr and would yield a drift of 888ppm at 300ppm/√kHr. Ten

years is 87.7kHr and would yield a drift of 2,809 ppm at 300 ppm/√kHr.

Drift without power applied to the device may be approximated as 1/10th

of the drift with power, or 30ppm/√kHr for a 300ppm/√kHr device.

ELECTRICAL CHARACTERISTICS