LTC6900

1

6900f

, LTC and LT are registered trademarks of Linear Technology Corporation.

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One External Resistor Sets the Frequency

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1kHz to 20MHz Frequency Range

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500

s

Frequency Error

≤1.5% Max, 5kHz to 10MHz

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Frequency Error

≤2% Max, 5kHz to 10MHz

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±40ppm/°C Temperature Stability

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0.04%/V Supply Stability

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50%

±1% Duty Cycle 1kHz to 2MHz

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50%

±5% Duty Cycle 2MHz to 10MHz

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Fast Start-Up Time: 50

µs to 1.5ms

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100

Ω CMOS Output Driver

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Operates from a Single 2.7V to 5.5V Supply

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Low Profile (1mm) ThinSOT

Low Power, 1kHz to 20MHz

Resistor Set SOT-23 Oscillator

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Portable and Battery-Powered Equipment

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PDAs

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Cell Phones

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Low Cost Precision Oscillator

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Charge Pump Driver

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Switching Power Supply Clock Reference

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Clocking Switched Capacitor Filters

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Fixed Crystal Oscillator Replacement

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Ceramic Oscillator Replacement

The LTC

easy to use and occupies very little PC board space. The

oscillator frequency is programmed by a single external

accuracy operation (

≤1.5% frequency error) without the

need for external trim components.

The LTC6900 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. The frequency-setting

resistor can vary from 10k

Ω to 2MΩ to select a master

oscillator frequency between 100kHz and 20MHz (5V

supply). The three-state DIV input determines whether the

master clock is divided by 1, 10 or 100 before driving the

output, providing three frequency ranges spanning 1kHz

to 20MHz (5V supply). The LTC6900 features a proprietary

feedback loop that linearizes the relationship between

calculate frequency. The oscillator can be easily pro-

grammed using the simple formula outlined below:

f

MHz

k

NR

N

Open

OSC

SET

=•

•









=











=

=

=

+

10

20

100

10

1

,

,

,

,

DIV Pin

V

DIV Pin

DIV Pin GND

Clock Generator

1

2

3

5

1kHz

5V

5V, N = 100

10k

0.1

µF

6900 TA01

4

GND

LTC6900

SET

OUT

DIV

OPEN, N = 10

N = 1

20k

()

ThinSOT is a trademark of Linear Technology Corporation.

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

DESIRED OUTPUT FREQUENCY (Hz)

10

100

1k

100k

1M

10M

6900 F02

1

10k

10000

1000

100M

÷100

÷10

÷1