LTC6905IS5 Linear Technology, LTC6905IS5 Datasheet

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LTC6905IS5

Manufacturer Part Number
LTC6905IS5
Description
Manufacturer
Linear Technology
Type
Silicon Oscillatorr
Datasheet

Specifications of LTC6905IS5

Mounting Style
Surface Mount
Screening Level
Industrial
Product Length (mm)
2.9mm
Product Depth (mm)
1.75mm
Product Height (mm)
0.9mm
Package / Case
TSOT-23
Lead Free Status / RoHS Status
Not Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC6905IS5#TRMPBF
0
Part Number:
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Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC6905IS5-133
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC6905IS5-80
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Quantity:
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Part Number:
LTC6905IS5-96
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC6905IS5-96
Manufacturer:
LT/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
n
n
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n
n
n
n
n
n
n
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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.
TYPICAL APPLICATION
10k ≤ R
One External Resistor Sets the Frequency
Fast Start-Up Time: 100μs Typical
Frequency Range: 17MHz to 170MHz
Frequency Error ±0.5% Typ 17MHz to 170MHz
(T
±20ppm/°C Temperature Stability
Rise Time: 0.5ns, C
Timing Jitter: 7.2ps RMS at 170MHz
50% ±2.5% Duty Cycle
6mA Typical Supply Current, f
CMOS Output Drives 500Ω Load (V
Operates from a Single 2.7V to 5.5V Supply
Low Profi le (1mm) ThinSOT ™ Package
High Frequency Precision Oscillator
High Speed Data Bus Clock
Fixed Crystal Oscillator Replacement
Ceramic Oscillator Replacement
A
= 0°C to 70°C, Over All Settings)
SET
≤ 25k
5V
0.1μF
Basic Connection
L
= 5pF
1
2
3
V
GND
SET
LTC6905
+
6905 TA01
OUT
DIV
OSC
17.225MHz ≤ f
5
4
= 100MHz
S
= 3V)
÷1
÷4
5V
OSC
÷2
≤ 170MHz
OPEN
Resistor Set SOT-23 Oscillator
DESCRIPTION
The LTC
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, R
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 R
The LTC6905 features a proprietary feedback loop that
linearizes the relationship between R
eliminating the need for tables to calculate frequency. The
oscillator can be easily programmed using the simple
formula outlined below:
For higher accuracy, fi xed frequency versions that
include an internal frequency-setting resistor, see the
LTC6905-XXX Series data sheet.
f
OSC
=
Typcial Distribution of Frequency Error, T
168 5
®
6905 precision, programmable silicon oscilla-
.
60
50
40
30
20
10
0
–0.5
MHz
R
NOTE: RESISTOR, R
SET
V
R
DIV = 1
+
SET
= 3V
SET
10
= 12k
–0.3
TO THE FREQUENCY ERROR
17MHz to 170MHz
k
, between 10k to 25k is used to set
Ω
+
–0.1
1 5
% ERROR
.
SET
MHz
, TOLERANCE WILL ADD
0.1
• ,
N
1
0.3
N
SET
=
SET
6905 TA02
LTC6905
1
2
4
and frequency,
,
0.5
,
,
value.
A
DIV Pin V
DIV Pin
DIV Pin GND
= 25°C
=
=
=
Open
6905fd
1
+

Related parts for LTC6905IS5

LTC6905IS5 Summary of contents

Page 1

... 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. TYPICAL APPLICATION Basic Connection 17.225MHz ≤ ...

Page 2

... Storage Temperature Range ...................– 65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL (MINI) TAPE AND REEL LTC6905CS5#TRMPBF LTC6905CS5#TRPBF LTC6905IS5#TRMPBF LTC6905IS5#TRPBF LTC6905HS5#TRMPBF LTC6905HS5#TRPBF LTC6905MPS5#TRMPBF LTC6905MPS5#TRPBF LEAD BASED FINISH TAPE AND REEL (MINI) TAPE AND REEL LTC6905MPS5#TRM LTC6905MPS5#TR TRM = 500 pieces. *The temperature grade is identifi ...

Page 3

... LTC6905HS5 (25°C ≤ T ≤ 125°C), LTC6905IS5 (25°C ≤ T ≤ 85° 2.7V, 17.225MHz < f < 170MHz V+ = 5V, 17.225MHz < f < 170MHz LTC6905MPS5 (–55°C < T < 125°C), LTC6905HS5 (–40°C ≤ T ≤ 125°C), LTC6905IS5 (–40°C ≤ T ≤ 85° 2.7V, 17.225MHz < f < 170MHz + V = 5V, 17.225MHz < ...

Page 4

LTC6905 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T otherwise noted. All voltages are with respect to GND. SYMBOL PARAMETER V Low Level Output Voltage (Note OUT Rise/Fall Time (Note ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS + OUT 2.5 3 3.5 4 4.5 5 SUPPLY VOLTAGE (V) 6905 G04 LTC6905 Output Operating at 17.5MHz 1V/DIV 12.5ns/DIV ...

Page 6

LTC6905 BLOCK DIAGRAM + SET I RES SET 3 – – BIAS + GND ±5% RES + (V – SET + GAIN = 1 MASTER OSCILLATOR – I ...

Page 7

THEORY OF OPERATION As shown in the Block Diagram, the LTC6905’s master oscillator is controlled by the ratio of the voltage between + the V and SET pins and the current entering the SET pin (I ). The voltage on ...

Page 8

... JITTER AND POWER SUPPLY NOISE If the LTC6905 is powered by a supply that has frequency greater than 5pF LOAD contents equal to the output frequency then the oscillators ) and output OSC jitter may increase. In addition, power supply ripple in excess of 20mV at any frequency may increase jitter. ...

Page 9

APPLICATIONS INFORMATION JITTER AND DIVIDE RATIO At a given output frequency, a higher master oscillator frequency and a higher divide ratio will result in lower jitter and higher power supply dissipation. Indeterminate jitter percentage will decrease by a factor of ...

Page 10

LTC6905 APPLICATIONS INFORMATION ALTERNATIVE METHODS OF SETTING THE OUTPUT FREQUENCY OF THE LTC6905 The LTC6905 may be programmed by any method that sources a current into the SET pin (Pin 3). The accuracy of the programming is best with a ...

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. S5 Package ...

Page 12

... FAX: (408) 434-0507 ● COMMENTS Single Output, High Frequency Operation Single Output Lower Power 2 4-Phase Outputs 3-Wire or I High Accuracy, No External Resistor Ultralow Power, Resistor Sets Frequency www.linear.com ● ™ Programmable 6905fd LT 0808 REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2005 ...

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