LTC6905 datasheet(1/12 Pages) LINER

Part #	LTC6905

Description	17MHz to 170MHz Resistor Set SOT-23 Oscillator

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC6905

1

6905fd

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

17MHz to 170MHz

Resistor Set SOT-23 Oscillator

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, RSET, 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 RSET value.

The LTC6905 features a proprietary feedback loop that

linearizes the relationship between RSET and frequency,

eliminating the need for tables to calculate frequency. The

oscillator can be easily programmed using the simple

formula outlined below:

f

MHz

k

R

MHz

N

Open

OSC

SET

=

Ω

+

⎛

⎝

⎜

⎞

⎠

⎟

=

⎧

⎨

⎪

⎩

⎪

=

+

168 5

10

15

1

2

4

.•

.• ,

,

DIV Pin

V

DIV Pin

GND

For higher accuracy, ﬁxed frequency versions that

include an internal frequency-setting resistor, see the

LTC6905-XXX Series data sheet.

Typcial Distribution of Frequency Error, TA = 25°C

n One External Resistor Sets the Frequency

n Fast Start-Up Time: 100μs Typical

n Frequency Range: 17MHz to 170MHz

n Frequency Error ±0.5% Typ 17MHz to 170MHz

(TA = 0°C to 70°C, Over All Settings)

n ±20ppm/°C Temperature Stability

n Rise Time: 0.5ns, CL = 5pF

n Timing Jitter: 7.2ps RMS at 170MHz

n 50% ±2.5% Duty Cycle

n 6mA Typical Supply Current, fOSC = 100MHz

n CMOS Output Drives 500Ω Load (VS = 3V)

n Operates from a Single 2.7V to 5.5V Supply

n Low Proﬁle (1mm) ThinSOT™ Package

n High Frequency Precision Oscillator

n High Speed Data Bus Clock

n Fixed Crystal Oscillator Replacement

n Ceramic Oscillator Replacement

L, 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.

% ERROR

–0.5

0

10

20

30

40

50

60

NOTE: RESISTOR, RSET, TOLERANCE WILL ADD

TO THE FREQUENCY ERROR

–0.3

–0.1

0.1

0.3

6905 TA02

0.5

V+ = 3V

RSET = 12k

DIV = 1

V+

1

2

3

5

17.225MHz ≤ fOSC ≤ 170MHz

5V

10k ≤ RSET ≤ 25k

0.1μF

6905 TA01

4

GND

LTC6905

SET

OUT

DIV

OPEN

÷2

÷1

÷4

Basic Connection

Similar Part No. - LTC6905

Manufacturer	Part #	Datasheet	Description
Linear Technology	LTC6905	119Kb / 8P	17MHz to 170MHz Resistor Set SOT-23 Oscillator
Analog Devices	LTC6905	643Kb / 14P	Micropower, 10kHz to 1MHz Resistor Set Oscillator in SOT-23 Rev. D
Analog Devices	LTC6905	575Kb / 16P	Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation Rev. C
Linear Technology	LTC6905-XXX	150Kb / 8P	Fixed Frequency SOT-23 Oscillator
Analog Devices	LTC6905-XXX	575Kb / 16P	Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation Rev. C

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Similar Description - LTC6905

Manufacturer	Part #	Datasheet	Description
Linear Technology	LT1799	120Kb / 4P	1kHz to 30MHz Resistor Set SOT-23 Oscillator
	LTC6905	119Kb / 8P	17MHz to 170MHz Resistor Set SOT-23 Oscillator
	LTC6900	187Kb / 12P	Low Power, 1kHz to 20MHz Resistor Set SOT-23 Oscillator
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	LTC6907	170Kb / 12P	Micropower, 40kHz to 4MHz Resistor Set Oscillator in SOT-23
	LTC6908-1	247Kb / 16P	Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
	LTC6900	165Kb / 12P	Low Power, 1kHz to 20MHz Resistor Set SOT-23 Oscillator
	LTC1799	242Kb / 14P	1kHz to 33MHz Resistor Set SOT-23 Oscillator
	LTC6906	174Kb / 14P	Micropower, 10kHz to 1MHz Resistor Set Oscillator in SOT-23
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