LTC6905-XXX Linear Technology, LTC6905-XXX Datasheet

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LTC6905-XXX

Manufacturer Part Number

LTC6905-XXX

Description

Fixed Frequency SOT-23 Oscillator

Manufacturer

Linear Technology

Datasheet

1.LTC6905-XXX.pdf (8 pages)

Current page: 1 of 8
Download datasheet (176Kb)

www.DataSheet4U.com

FEATURES

TYPICAL APPLICATIO

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APPLICATIO S

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.

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

No External Components to Set Frequency

Frequency Error ±0.5% Typical

Fast Start-Up Time: 100µs Typical

±20ppm/°C Temperature Stability

Output Enable Provided

Includes Divide by 1, 2 or 4

Rise Time: 0.5ns, C

Timing Jitter: <0.8% Typical

50% ±2.5% Duty Cycle

I

CMOS Output Drives 600Ω Load

Single Supply 2.7V to 5.5V

Low Profile (1mm) ThinSOT

Data Clocks for High Reliability Applications

High Vibration, High Acceleration Environments

Replacement for Fixed Crystal and Ceramic

Oscillators

S

= 8mA Typical (f

0.1µF

3V

1

2

3

U

Basic Connection

V

LTC6905-133

GND

OE

OSC

+

L

= 5pF

= 100MHz, C

6905x TA01

OUT

DIV

TM

5

4

U

Package

f

OSC

÷1

÷4

= 133MHz

3V

L

÷2

= 5pF)

OPEN

DESCRIPTIO

The LTC

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 com-

ponents. 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:

The LTC6905-XXX series of parts are designed with 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.

LTC6905-133: f

LTC6905-100: f

LTC6905-96: f

LTC6905-80: f

Typical Distribution of Frequency Error, T

®

6905-XXX series of parts are precision, fixed

40

30

20

10

0

–1

V

S

= 3V

LTC6905-XXX Series

OSC

OSC

OSC

OSC

U

–0.5

% FREQUENCY ERROR

SOT-23 Oscillator

Fixed Frequency

= 96MHz, 48MHz, 24MHz

= 80MHz, 40MHz, 20MHz

= 133MHz, 66.7MHz, 33.3MHz

= 100MHz, 50MHz, 25MHz

0.0

0.5

6905x TA02

A

1

= 25°C

6905xf

1

Related parts for LTC6905-XXX

LTC6905-XXX Summary of contents

Page 1

... The four products of the LTC6905-XXX family are: The LTC6905-XXX series of parts are designed with a factory trim option to modify the divider ratios from 16, 32. A second trim option allows for additional master clock frequencies ...

Page 2

... LTC6905-XXX Series W ABSOLUTE AXI U RATI GS (Note 1) + Supply Voltage ( GND ........................– 0. DIV to GND .................................... – 0. GND ..................................... – 0. Output Short-Circuit Duration (Note 6) ........... Indefinite Operating Temperature Range (Note 8) LTC6905C .......................................... – 40°C to 85°C LTC6905I ............................................ – 40°C to 85°C LTC6905H ........................................ – 40°C to 125°C www ...

Page 3

... The LTC6905C-XXX is designed, characterized and expected to meet specified performance from –40°C to 85°C but is not tested or QA sampled at these temperatures. The LTC6905I-XXX is guaranteed to meet specified performance from –40°C to 85°C. LTC6905-XXX Series + + , V = 2.7V to 3.6V, R ...

Page 4

... LTC6905-XXX Series TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Frequency 18 5.5V 2. ÷2 8 ÷4 6 www.DataSheet4U.com ÷2 4 ÷ FREQUENCY (MHz OUT 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) LTC6905-80 Output Operating at 20MHz, V 0.75V/DIV ÷1 ÷1 100 150 200 ...

Page 5

... V – BIAS + GND 2 Table 1. LTC6905-XXX Frequency Settings + ≤ 5.5V). This supply to V ing Pin 4 divides the master oscillator by 2. Pin 4 should be tied to GND for the ÷4 setting, the lowest frequency range. To detect a floating DIV pin, the LTC6905 attempts to pull the pin toward midsupply. This is realized with two internal current sources, one tied to V tied to ground and Pin 4 ...

Page 6

... The frequency accuracy of the LTC6905 may be affected when its power supply generates noise with frequency contents equal to f /64 or its multiples highest frequency for an LTC6905-XXX which is with + DIV = V (÷1). This is also the frequency indicated in the part number (i.e., LTC6905-100 the master oscillator control loop frequency. For ex- ...

Page 7

... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC6905-XXX Series 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP ...

Page 8

... LTC6905-XXX Series TYPICAL APPLICATIO S www.DataSheet4U.com RELATED PARTS PART NUMBER DESCRIPTION LTC1799 1kHz to 33MHz ThinSOT Oscillator LTC6900 1kHz to 20MHz ThinSOT Oscillator LTC6902 Multiphase Oscillator with Spread Spectrum Modulation LTC6903/LTC6904 1kHz to 68MHz Serial Port Programmable Oscillator LTC6905 17MHz to 170MHz Resistor Set ThinSOT Oscillator ...

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