鈻?/div>
DESCRIPTIO
One External Resistor Sets the Frequency
Fast Start-Up Time: 100
碌
s Typical
Frequency Range: 17MHz to 170MHz
Frequency Error
鹵0.5%
Typ 17MHz to 170MHz
(T
A
= 0擄C to 70擄C, Over All Settings)
鹵20ppm/擄C
Temperature Stability
Rise Time: 0.5ns, C
L
= 5pF
Timing Jitter: 50ps at 170MHz
50%
鹵2.5%
Duty Cycle
6mA Typical Supply Current, f
OSC
= 100MHz
CMOS Output Drives 500鈩?Load (V
S
= 3V)
Operates from a Single 2.7V to 5.5V Supply
Low Profile (1mm) ThinSOT
TM
Package
The LTC
廬
6905 precision, programmable silicon oscillator
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
SET
, between 10K to 25K is used to set 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
SET
value.
The LTC6905 features a proprietary feedback loop that
linearizes the relationship between R
SET
and frequency,
eliminating the need for tables to calculate frequency. The
oscillator can be easily programmed using the simple
formula outlined below:
,
鈳?/div>
1 DIV Pin
=
V
+
鈳?/div>
168.5MHz 鈥?10k
鈩?/div>
鈳?/div>
1
鈳?/div>
=
鈳?/div>
+
1.5MHz
鈳?/div>
鈥?, N
=
鈳?/div>
2, DIV Pin
=
Open
鈳?/div>
鈳?/div>
N
R
SET
鈳?/div>
4, DIV Pin
=
GND
鈳?/div>
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
High Frequency Precision Oscillator
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.
f
OSC
For higher accuracy, fixed frequency versions that include
an internal frequency-setting resistor, see the LTC6905-
XXX Series datasheet.
TYPICAL APPLICATIO
Typical Distribution of Frequency Error, T
A
= 25擄C
60
50
40
V
+
= 3V
R
SET
= 12k
DIV = 1
Basic Connection
UNITS
5V
0.1碌F
10k
鈮?/div>
R
SET
鈮?/div>
25k
17.225MHz
鈮?/div>
f
OSC
鈮?/div>
170MHz
1
2
3
OUT
V
+
LTC6905
GND
SET
DIV
6905 TA01
5
5V
梅1
4
梅4
梅2
OPEN
30
20
10
0
鈥?.5
NOTE: RESISTOR, R
SET
, TOLERANCE WILL ADD
TO THE FREQUENCY ERROR
6905fa
U
鈥?.3
鈥?.1
0.1
% ERROR
0.3
0.5
6905 TA02
U
U
1
LTC6905HS5相關型號PDF文件下載
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