LTC6902 查看數據表（PDF） - Linear Technology

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LTC6902

Multiphase Oscillator with Spread Spectrum Frequency Modulation

Linear Technology 

LTC6902

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Frequencies near 100kHz and 1MHz may be generated using two

different values of RSET (see Applications Information). For these

frequencies, the error is specified under the following assumption:

20k < RSET ≤ 400k for 5kHz ≤ fOUT ≤ 10MHz.

Note 3: Frequency accuracy is defined as the deviation from the fOUT

equation.

Note 4: Jitter is the ratio of the peak-to-peak distribution of the period to

the mean of the period. This specification is based on characterization and

is not 100% tested.

Note 5: Guaranteed by 5V test.

Note 6: To conform with the Logic IC Standard convention, current out of

a pin is arbitrarily given as 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: fMAX is defined as the highest frequency excursion and is equal to

the fOUT frequency set by the RSET resistor. fMIN is the lowest frequency

excursion.

Note 9: The LTC6902CMS and LTC6902IMS are guaranteed functional

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

Note 10: The LTC6902CMS is guaranteed to meet 0°C to 70°C specifica-

tions and are designed, characterized and expected to meet the specified

performance from –40°C to 85°C but is not tested or QA sampled at these

temperatures. The LTC6902IMS is guaranteed to meet specified perfor-

mance from –40°C to 85°C.

TYPICAL PERFOR A CE CHARACTERISTICS

Frequency Variation vs RSET

4

TA = 25°C

3 GUARANTEED LIMITS APPLY OVER

20kΩ ≤ RSET ≤ 400kΩ

2

1

TYPICAL HIGH

0

–1

TYPICAL LOW

–2

–3

–4

1k

10k

100k

RSET (Ω)

1M

6902 G01

Frequency Variation Over

Temperature

1.00

RSET = 63.4k

0.75 ÷1 OR ÷10 OR ÷100

0.50

TYPICAL

0.25

HIGH

0

–0.25

–0.50

TYPICAL

LOW

–0.75

–1.00

–40 –20

0 20 40 60

TEMPERATURE (°C)

80

6902 G02

Peak-to-Peak Jitter vs Output

Frequency (M = 1, 2-Phase Mode)

1.0

0.9

0.8

0.7

÷1, VA = 5V

0.6

÷1, VA = 3V

0.5

0.4

0.3

÷10

0.2

0.1 ÷100

0

1k

10k

100k

1M

10M

OUTPUT FREQUENCY (Hz)

6902 G03

4

Supply Current vs Output

Frequency [SSFM Disabled,

2-Phase Mode (M = 1)]

3.5

3.0

2.5

÷1, 5V

2.0

÷10, 5V

1.5

÷100, 5V

1.0

0.5

0 ÷100, 3V ÷10, 3V

1k

10k

100k

÷1, 3V

1M

10M

OUTPUT FREQUENCY (Hz)

6902 G04

Output Resistance

vs Supply Voltage

140

TA = 25°C

120

OUTPUT SOURCING CURRENT

100

80

60

OUTPUT SINKING CURRENT

40

2.5 3.0 3.5 4.0 4.5 5.0

SUPPLY VOLTAGE (V)

5.5 6.0

6902 G05

6902f

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