LTC6905CS5#TRMPBF Linear Technology, LTC6905CS5#TRMPBF Datasheet

IC OSC PREC LP RES SET TSOT23-5

LTC6905CS5#TRMPBF

Manufacturer Part Number
LTC6905CS5#TRMPBF
Description
IC OSC PREC LP RES SET TSOT23-5
Manufacturer
Linear Technology
Type
Oscillator, Siliconr
Datasheet

Specifications of LTC6905CS5#TRMPBF

Frequency
170MHz
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
14mA
Operating Temperature
-40°C ~ 85°C
Package / Case
TSOT-23-5, TSOT-5, TSOP-5
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count
-
Other names
LTC6905CS5#TRMPBFTR

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FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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
+

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LTC6905CS5#TRMPBF 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

... LTC6905H ..........................................– 40°C to 125°C LTC6905MP .......................................– 55°C to 125°C 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 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T otherwise noted. All voltages are with respect to GND. SYMBOL PARAMETER Δf Frequency Accuracy (Notes 2, 9) Δf Frequency Accuracy (Notes Frequency-Setting Resistor Range SET f Maximum ...

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

LTC6905 APPLICATIONS INFORMATION SELECTING THE DIVIDER SETTING AND RESISTOR The LTC6905’s master oscillator has a frequency range spanning 68.9MHz to 170MHz. A programmable divider extends the frequency range from 17.225MHz to 170MHz. Table 1 describes the recommended frequencies for each ...

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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