LTC6908-2 datasheet(1/16 Pages) LINER

tên linh kiện	LTC6908-2

Giải thích chi tiết về linh kiện	Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation

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nhà sản xuất	LINER [Linear Technology]

Trang chủ	http://www.linear.com

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LTC6908-1/LTC6908-2

1

690812fa

690812 TA01b

FREQUENCY

(FUNDAMENTAL AND HARMONICS SHOWN)

150kHz

0

–10

–20

–30

–40

0

–10

–20

–30

–40

30MHz

SSFM DISABLED

SSFM ENABLED

Resistor Set SOT-23

Oscillator with Spread

Spectrum Modulation

The LTC®6908 is an easy-to-use precision oscillator that

provides 2-outputs, shifted by either 180° or 90°. The

oscillator frequency is programmed by a single external

resistor (RSET)andspreadspectrumfrequencymodulation

(SSFM) can be activated for improved electromagnetic

compatibility (EMC) performance.

The LTC6908 operates with a single 2.7V to 5.5V supply

and provides rail-to-rail, 50% duty cycle square wave

outputs. A single resistor from 10k to 2M is used to select

an oscillator frequency from 50kHz to 10MHz (5V supply).

The oscillator can be easily programmed using the simple

formula outlined below:

fOUT =10MHz • 10k/RSET

The LTC6908’s SSFM capability modulates the output

frequency by a pseudorandom noise (PRN) signal to

decrease the peak electromagnetic radiation level and

improve EMC performance. The amount of frequency

spreading is ﬁxed at ±10% of the center frequency. When

SSFM is enabled, the rate of modulation is selected by the

user. The three possible modulation rates are fOUT/16,

fOUT/32 and fOUT/64.

■ Switching Power Supply Clock Reference

■ Portable and Battery-Powered Equipment

■ Precision Programmable Oscillator

■ Charge Pump Driver

■ LTC6908-1: Complementary Outputs (0°/180°)

■ LTC6908-2: Quadrature Outputs (0°/90°)

■ 50kHz to 10MHz Frequency Range

■ One External Resistor Sets the Frequency

■ Optional Spread Spectrum Frequency Modulation

for Improved EMC Performance

■ ±10% Frequency Spreading

■ 400µA Supply Current Typical (V+ = 5V, 50kHz)

■ Frequency Error ≤1.5% Max (TA = 25°C, V+ = 3V)

■ ±40ppm/°C Temperature Stability

■ Fast Start-Up Time: 260µs Typical (1MHz)

■ Outputs Muted Until Stable

■ Operates from a Single 2.7V to 5.5V Supply

■ Available in Low Proﬁle (1mm) ThinSOT and DFN

(2mm

× 3mm) Packages

APPLICATIO S

FEATURES

DESCRIPTIO

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

All other trademarks are the property of their respective owners.

2.25MHz, 2.5V/8A Step-Down Regulator

TYPICAL APPLICATIO

CBYP

44.2k

OUT1

OUT2

fOUT = 10MHz • 10k/RSET

MOD

V+

GND

SET

690812 TA01a

SVIN TRACK

LTC3418

RT

CIN

100

µF

0.2

µH

LTC6908-1

RUN/SS

ITH

PGOOD

SW

PGND

SGND

SYNC/MODE VFB

PVIN

820pF

1000pF

0.1

µF

COUT

100

µF

×2

VOUT

2.5V

8A

4.32k

2k

41.2k

2.2M

VIN

2.8V TO 5.5V

4.99k

150kHz to 30MHz Output

Frequency Spectrum

(9kHz Res BW)

Số phần tương tự - LTC6908-2

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Analog Devices	LTC6908-2	575Kb / 16P	Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation Rev. C
Linear Technology	LTC6908-2	253Kb / 16P	Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation

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