ltc6905cs5-trpbf Linear Technology Corporation, ltc6905cs5-trpbf Datasheet

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ltc6905cs5-trpbf

Manufacturer Part Number
ltc6905cs5-trpbf
Description
17mhz To 170mhz Resistor Set Sot-23 Oscillator
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
TYPICAL APPLICATIO
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 6614313, 6342817.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a
One External Resistor Sets the Frequency
Fast Start-Up Time: 100
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 Profile (1mm) ThinSOT
High Frequency Precision Oscillator
High Speed Data Bus Clock
Fixed Crystal Oscillator Replacement
Ceramic Oscillator Replacement
10k ≤ R
A
= 0°C to 70°C, Over All Settings)
SET
≤ 25k
5V
0.1µF
U
Basic Connection
L
= 5pF
1
2
3
µ
V
GND
SET
s Typical
LTC6905
+
TM
6905 TA01
OUT
OSC
DIV
Package
U
17.225MHz ≤ f
5
4
= 100MHz
S
= 3V)
÷1
÷4
5V
OSC
÷2
≤ 170MHz
OPEN
Resistor Set SOT-23 Oscillator
DESCRIPTIO
The LTC
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
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, fixed frequency versions that include
an internal frequency-setting resistor, see the LTC6905-
XXX Series datasheet.
f
OSC
=
Typical Distribution of Frequency Error, T
168 5
®
6905 precision, programmable silicon oscillator
.
MHz
R
60
50
40
30
20
10
0
SET
–0.5
NOTE: RESISTOR, R
V
R
DIV = 1
SET
+
SET
10
= 3V
17MHz to 170MHz
U
= 12k
–0.3
, between 10K to 25K is used to set the
TO THE FREQUENCY ERROR
k
+
1 5
–0.1
.
% ERROR
MHz
SET
, TOLERANCE WILL ADD
0.1
• ,
N
1
N
0.3
SET
SET
=
LTC6905
6905 TA02
1
and frequency,
2
4
,
value.
,
,
A
0.5
DIV Pin V
DIV Pin
DIV Pin GND
= 25°C
=
=
=
Open
6905fb
1
+

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ltc6905cs5-trpbf Summary of contents

Page 1

... High Speed Data Bus Clock ■ Fixed Crystal Oscillator Replacement ■ Ceramic Oscillator Replacement , LTC and LT 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. U TYPICAL APPLICATIO ...

Page 2

... V = 2.7V to 5.5V CONDITIONS + V = 2.7V, 17.225MHz < f < 170MHz + V = 5V, 17.225MHz < f < 170MHz LTC6905CS5 + V = 2.7V, 17.225MHz < f < 170MHz + V = 5V, 17.225MHz < f < 170MHz LTC6905HS5 (25°C ≤ T ≤ 125°C), LTC6905IS5 (25°C ≤ T ≤ 85° 2.7V, 17.225MHz < f < 170MHz ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T otherwise noted. All voltages are with respect to GND. SYMBOL PARAMETER V High Level DIV Input Voltage IH V Low Level DIV Input Voltage IL I DIV Input Current (Note 4) ...

Page 4

LTC6905 W U TYPICAL PERFOR A CE CHARACTERISTICS + OUT 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V) 6905 G04 LTC6905 Output Operating at 17.5MHz, ...

Page 5

W BLOCK DIAGRA + SET I RES SET 3 – – BIAS + GND 2 THEORY OF OPERATIO As shown in the Block Diagram, the LTC6905’s master oscillator is controlled by the ratio of the ...

Page 6

LTC6905 U U APPLICATIO S I FOR ATIO 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 ...

Page 7

... 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 8

... MHz ⎥ ⎢ Ω Ω ⎣ ⎦ ⎦ Programmable LT/LT 0905 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2005 sets SET will sub- ⎤ ⎥ ⎥ MHz ⎥ ⎥ ⎥ ⎦ 6905fb ...

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