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LTC6905-133| Datasheet

By datasheet - November 4th, 2008

LTC6905-133| Datasheet

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LTC6905-XXX Series Fixed Frequency SOT-23 Oscillator
FEATURES

DESCRIPTIO

No External Components to Set Frequency Frequency Error: 0.5% Typical Fast Start-Up Time: 100us Typical 20ppm/ C Temperature Stability Includes Output Enable Includes Frequency Divide by 1, 2 or 4 Rise Time: 0.5ns, CL = 5pF Timing Jitter: <0.8% Typical Duty Cycle: 50% 2.5% IS = 8mA Typical (fOSC = 100MHz, CL = 5pF) CMOS Output Drives 600 Load Single Supply 2.7V to 5.5V Low Profile (1mm) ThinSOTTM Package

The LTC 6905-XXX series are precision, fixed frequency silicon oscillators designed to minimize board space while maximizing accuracy and ease of use. Programmed at the factory to a fixed frequency, the LTC6905-XXX series of parts need no external trim components. An internal three-state divider allows for division of the master clock by 1, 2 or 4, providing 3 frequencies (for each device). The LTC6905-XXX series operate with a single 2.7V to 5.5V power supply and provide a rail-to-rail, 50% duty cycle, square wave output. The OE pin will disable the output when brought low and synchronously enable the output when brought high, avoiding pulse slivers. The four products of the LTC6905-XXX family are: LTC6905-133: fOSC = 133MHz, 66.7MHz, 33.3MHz LTC6905-100: fOSC = 100MHz, 50MHz, 25MHz LTC6905-96: fOSC = 96MHz, 48MHz, 24MHz LTC6905-80: fOSC = 80MHz, 40MHz, 20MHz The LTC6905-XXX series of parts provides a factory trim option to modify the divider ratios from 1, 2, 4 to 8, 16, 32. A second trim option allows for
additional master clock frequencies. For the alternate divider ratios and unlisted frequencies, contact LTC marketing.

APPLICATIO S

Data Clocks for High Reliability Applications High Vibration, High Acceleration Environments Replacement for Fixed Crystal and Ceramic Oscillators

, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6614313, 6342817.

TYPICAL APPLICATIO

Typical Distribution of Frequency Error, TA = 25 C
40 VS = 3V

Basic Connection
fOSC = 133MHz
UNITS
30

3V 0.1uF

1 2 3

OUT V+ LTC6905-133 GND OE DIV
6905x TA01

5
20

3V
1

4
4

2

OPEN

10

0 1 0.5 0.0 0.5 % FREQUENCY ERROR
1
6905x TA02

U
6905xfa

U

U

1


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