鈮?/div>
2% Max, 5kHz to 10MHz
(T
A
= 0擄C to 70擄C)
鹵40ppm/擄C
Temperature Stability
0.04%/V Supply Stability
50%
鹵1%
Duty Cycle 1kHz to 2MHz
50%
鹵5%
Duty Cycle 2MHz to 10MHz
Fast Start-Up Time: 50碌s to 1.5ms
100鈩?CMOS Output Driver
Operates from a Single 2.7V to 5.5V Supply
Low Profile (1mm) ThinSOT
TM
Package
The LTC
廬
6900 is a precision, low power oscillator that is
easy to use and occupies very little PC board space. The
oscillator frequency is programmed by a single external
resistor (R
SET
). The LTC6900 has been designed for high
accuracy operation (鈮?.5% frequency error) without the
need for external trim components.
The LTC6900 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. The frequency-setting
resistor can vary from 10k鈩?to 2M鈩?to select a master
oscillator frequency between 100kHz and 20MHz (5V
supply). The three-state DIV input determines whether the
master clock is divided by 1, 10 or 100 before driving the
output, providing three frequency ranges spanning 1kHz
to 20MHz (5V supply). The LTC6900 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 pro-
grammed using the simple formula outlined below:
錚?/div>
20k
錚?/div>
f
OSC
=
10MHz
鈥?錚?/div>
錚?/div>
,
錚?/div>
N
鈥?/div>
R
SET
錚?/div>
錚?/div>
100, DIV Pin
=
V
+
錚?/div>
N
= 錚?/div>
10, DIV Pin
=
Open
錚?/div>
1 DIV Pin
=
GND
錚?/div>
,
APPLICATIO S
s
s
s
s
s
s
s
s
s
Portable and Battery-Powered Equipment
PDAs
Cell Phones
Low Cost Precision Oscillator
Charge Pump Driver
Switching Power Supply Clock Reference
Clocking Switched Capacitor Filters
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.
TYPICAL APPLICATIO
5V
0.1碌F
10k
鈮?/div>
R
SET
鈮?/div>
2M
R
SET
vs Desired Output Frequency
10000
Clock Generator
1
2
3
V
+
1kHz
鈮?/div>
f
OSC
鈮?/div>
20MHz
5
5V, N = 100
4
N=1
1000
GND
SET
DIV
R
SET
(k鈩?
OUT
LTC6900
梅100
100
OPEN, N = 10
20k
f
OSC
= 10MHz 鈥?/div>
N 鈥?R
SET
(
)
10
6900 TA01
1
1k
100k
1M
10M
10k
DESIRED OUTPUT FREQUENCY (Hz)
100M
U
梅10
梅1
6900 F02
U
U
6900f
1
LTC6900CS5相關型號PDF文件下載
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