參數(shù)資料
型號: LTC6905CS5
廠商: LINEAR TECHNOLOGY CORP
元件分類: XO, clock
英文描述: 17MHz to 170MHz Resistor Set SOT-23 Oscillator
中文描述: PLL FREQUENCY SYNTHESIZER, PDSO5
封裝: PLASTIC, SOT-23, 5 PIN
文件頁數(shù): 1/8頁
文件大?。?/td> 119K
代理商: LTC6905CS5
LTC6905
1
6905fa
, 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.
One External Resistor Sets the Frequency
Fast Start-Up Time: 100
μ
s Typical
Frequency Range: 17MHz to 170MHz
Frequency Error
±
0.5% Typ 17MHz to 170MHz
(T
A
= 0
°
C to 70
°
C, Over All Settings)
±
20ppm/
°
C Temperature Stability
Rise Time: 0.5ns, C
L
= 5pF
Timing Jitter: 50ps at 170MHz
50%
±
2.5% Duty Cycle
6mA Typical Supply Current, f
OSC
= 100MHz
CMOS Output Drives 500
Load (V
S
= 3V)
Operates from a Single 2.7V to 5.5V Supply
Low Profile (1mm) ThinSOT
TM
Package
17MHz to 170MHz
Resistor Set SOT-23 Oscillator
High Frequency Precision Oscillator
High Speed Data Bus Clock
Fixed Crystal Oscillator Replacement
Ceramic Oscillator Replacement
The LTC
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:
f
MHz
R
SET
k
MHz
N
N
Open
GND
OSC
=
+
=
=
=
=
+
168 5
10
1 5
.
1
1
2
4
.
,
,
,
,
DIVPin
DIVPin
DIVPin
V
For higher accuracy, fixed frequency versions that include
an internal frequency-setting resistor, see the LTC6905-
XXX Series datasheet.
Basic Connection
Typical Distribution of Frequency Error, T
A
= 25
°
C
60
V
+
= 3V
R
= 12k
DIV = 1
DESCRIPTIOU
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
V
+
1
2
3
5
17.225MHz
f
OSC
170MHz
5V
5V
10k
R
SET
25k
0.1
μ
F
6905 TA01
4
GND
LTC6905
SET
OUT
DIV
OPEN
÷
2
÷
1
÷
4
% ERROR
–0.5
0
U
10
20
30
40
50
NOTE: RESISTOR, R
, TOLERANCE WILL ADD
TO THE FREQUENCY ERROR
–0.3
–0.1
0.1
0.3
6905 TA02
0.5
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