LTC6900IS5#PBF Linear Technology, LTC6900IS5#PBF Datasheet

LTC6900IS5#PBF

Manufacturer Part Number

LTC6900IS5#PBF

Description

OSCILLATOR, 1KHZ TO 20MHZ, SOT-23-5

Manufacturer

Linear Technology

Datasheet

1.LTC6900IS5PBF.pdf (12 pages)

Specifications of LTC6900IS5#PBF

Clock External Input

Supply Voltage Range

2.7V To 5.5V

Digital Ic Case Style

SOT-23

No. Of Pins

Operating Temperature Range

-40Â°C To +85Â°C

Svhc

No SVHC (15-Dec-2010)

Frequency

20MHz

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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APPLICATIO S

FEATURES

TYPICAL APPLICATIO

Portable and Battery-Powered Equipment

PDAs

Cell Phones

Low Cost Precision Oscillator

Charge Pump Driver

Switching Power Supply Clock Reference

Clocking Switched Capacitor Filters

Fixed Crystal Oscillator Replacement

Ceramic Oscillator Replacement

One External Resistor Sets the Frequency

1kHz to 20MHz Frequency Range

500 A Typical Supply Current, V

Frequency Error 1.5% Max, 5kHz to 10MHz

Frequency Error 2% Max, 5kHz to 10MHz

0.04%/V Supply Stability

50% 1% Duty Cycle 1kHz to 2MHz

50% 5% Duty Cycle 2MHz to 10MHz

Fast Start-Up Time: 50 s to 1.5ms

100 CMOS Output Driver

Operates from a Single 2.7V to 5.5V Supply

Low Profile (1mm) ThinSOT

40ppm/ C Temperature Stability

10k R

= 25 C)

= 0 C to 70 C)

SET

OSC

0.1 F

= 10MHz •

Clock Generator

N • R

20k

GND

SET

LTC6900

SET

OUT

DIV

Package

1kHz f

N = 1

= 3V, 3MHz

5V, N = 100

OSC

20MHz

OPEN, N = 10

6900 TA01

Resistor Set SOT-23 Oscillator

DESCRIPTIO

The LTC

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

oscillator frequency is programmed by a single external

resistor (R

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 to 2M 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:

ThinSOT is a trademark of Linear Technology Corporation.

Low Power, 1kHz to 20MHz

OSC

SET

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

and frequency, eliminating the need for tables to

6900 is a precision, low power oscillator that is

MHz

SET

10000

1000

100

). The LTC6900 has been designed for high

SET

DESIRED OUTPUT FREQUENCY (Hz)

N R

vs Desired Output Frequency

10k

100

SET

100k

10M

100

6900 F02

LTC6900

100M

DIV Pin V

DIV Pin

DIV Pin GND

Open

6900f

Related parts for LTC6900IS5#PBF

LTC6900IS5#PBF Summary of contents

Page 1

... SET calculate frequency. The oscillator can be easily pro- grammed using the simple formula outlined below OSC , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. 1kHz f 20MHz OSC 5 5V 100 ...

Page 2

LTC6900 ABSOLUTE AXI U RATI GS (Note 1) + Supply Voltage ( GND ........................– 0. DIV to GND .................................... – 0. SET to GND ................................... – 0. Operating Temperature ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T All voltages are with respect to GND. SYMBOL PARAMETER V High Level Output Voltage (Note Low Level Output Voltage (Note OUT Rise Time r (Note ...

Page 4

LTC6900 W U TYPICAL PERFOR A CE CHARACTERISTICS Frequency Variation vs R SET GUARANTEED LIMITS APPLY OVER 20k R 400k SET 2 TYPICAL HIGH 1 0 –1 TYPICAL LOW –2 –3 –4 1k ...

Page 5

CTIO (Pin 1): Voltage Supply (2.7V V must be kept free from noise and ripple. It should be bypassed directly to a ground plane with a 0.1 F capacitor. GND (Pin 2): ...

Page 6

LTC6900 THEORY OF OPERATIO As shown in the Block Diagram, the LTC6900’s master oscillator is controlled by the ratio of the voltage between + the V and SET pins and the current (I SET pin. The voltage on the SET ...

Page 7

U U APPLICATIO S I FOR ATIO SELECTING THE DIVIDER SETTING AND RESISTOR The LTC6900’s master oscillator has a frequency range spanning 0.1MHz to 20MHz. However, accuracy may suffer if the master oscillator is operated at greater than 10MHz with ...

Page 8

LTC6900 U U APPLICATIO S I FOR ATIO POWER SUPPLY REJECTION Low Frequency Supply Rejection (Voltage Coefficient) Figure 5 shows the output frequency sensitivity to power supply voltage at several different temperatures. The LTC6900 has a guaranteed voltage coefficient of ...

Page 9

U U APPLICATIO S I FOR ATIO OUT OR LTC6900 SET1 GND f 100 R SET2 SET DIV 1 6900 F07 Figure 7 A ...

Page 10

LTC6900 U U APPLICATIO S I FOR ATIO Once known, calculate R IN SET 10 MHz • • SET N f OSC MAX ( ) MAX ( ) ...

Page 11

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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. W ...

Page 12

... YSI 44011 800 765-4974 T Output Frequency vs Temperature 1400 MAX TYP 1200 MIN 1000 800 600 400 200 0 –20 – TEMPERATURE ( C) 6900 TA03 COMMENTS Identical Pinout, Higher Frequency Operation www.linear.com 10MHz 20k = • LT/TP 0902 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2002 6900f ...

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