LTC6905IS5-80#TR datasheet, PDF

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LTC6905IS5-80#TR: DescriptionLTC6905-XXX - Fixed Frequency SOT-23 Oscillator; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C; CategoryPassive components oscillator; File Size162KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC6905IS5-80#TR Overview

LTC6905-XXX - Fixed Frequency SOT-23 Oscillator; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C

LTC6905IS5-80#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOT
package instruction	PLASTIC, SOT-23, 5 PIN
Contacts	5
Manufacturer packaging code	S5
Reach Compliance Code	not_compliant
ECCN code	EAR99
Other features	TAPE AND REEL
maximum descent time	0.5 ns
Frequency Adjustment - Mechanical	NO
frequency stability	20%
JESD-609 code	e0
Installation features	SURFACE MOUNT
Nominal operating frequency	80 MHz
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Oscillator type	CMOS
Output load	5 pF
physical size	2.9mm x 1.75mm x 1.0mm
longest rise time	0.5 ns
Maximum supply voltage	5.5 V
Minimum supply voltage	2.7 V
surface mount	YES
maximum symmetry	52.5/47.5 %
Terminal surface	Tin/Lead (Sn/Pb)

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LTC6905

17MHz to 170MHz

Resistor Set SOT-23 Oscillator

FEATURES

DESCRIPTION

The LTC

6905 precision, programmable silicon oscilla-

tor is easy to use and occupies very little board space. It

requires only a single resistor to set the output frequency

from 17MHz to 170MHz with a typical frequency error of

0.5% or less.

The LTC6905 operates with a single 2.7V to 5.5V power

supply and provides a rail-to-rail, 50% duty cycle square

wave output. The CMOS output driver ensures fast rise/fall

times and rail-to-rail switching. Operation is simple: A

single resistor, R

SET

, between 10k to 25k is used to set

the frequency, and an internal three-state divider (DIV

input) allows for division of the master clock by 1, 2 or 4,

providing three frequencies for each R

SET

value.

The LTC6905 features a proprietary feedback loop that

linearizes the relationship between R

SET

and frequency,

eliminating the need for tables to calculate frequency. The

oscillator can be easily programmed using the simple

formula outlined below:

OSC

⎧

1 DIV Pin

⎛

168.5MHz • 10k

⎞

⎪

⎜

1.5MHz

⎟

• , N

⎨

2, DIV Pin

Open

⎝

⎠

SET

⎪

4, DIV Pin

GND

⎩

One External Resistor Sets the Frequency

Fast Start-Up Time: 100μs Typical

Frequency Range: 17MHz to 170MHz

Frequency Error ±0.5% Typ 17MHz to 170MHz

= 0°C to 70°C, Over All Settings)

±20ppm/°C Temperature Stability

Rise Time: 0.5ns, C

= 5pF

Timing Jitter: 7.2ps RMS at 170MHz

50% ±2.5% Duty Cycle

6mA Typical Supply Current, f

OSC

= 100MHz

CMOS Output Drives 500Ω Load (V

= 3V)

Operates from a Single 2.7V to 5.5V Supply

Low Proﬁle (1mm) ThinSOT ™ Package

APPLICATIONS

High Frequency Precision Oscillator

High Speed Data Bus Clock

Fixed Crystal Oscillator Replacement

Ceramic Oscillator Replacement

LT, LTC and LTM 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.

For higher accuracy, ﬁxed frequency versions that

include an internal frequency-setting resistor, see the

LTC6905-XXX Series data sheet.

TYPICAL APPLICATION

Basic Connection

Typcial Distribution of Frequency Error, T

= 25°C

= 3V

SET

= 12k

DIV = 1

0.1μF

OUT

LTC6905

GND

SET

DIV

6905 TA01

÷1

÷4

÷2

OPEN

UNITS

17.225MHz ≤ f

OSC

≤ 170MHz

–0.5

10k ≤ R

SET

≤ 25k

–0.3

–0.1

0.1

% ERROR

0.3

0.5

6905 TA02

NOTE: RESISTOR, R

SET

, TOLERANCE WILL ADD

TO THE FREQUENCY ERROR

6905fd

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