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LTC6990CS6PBF

更新时间： 2024-10-03 11:41:31
品牌 Logo 应用领域
凌特 - Linear 振荡器
页数 文件大小 规格书
28页 310K
描述
TimerBlox: Voltage Controlled Silicon Oscillator

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LTC6990CS6PBF 数据手册

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LTC6990  
TimerBlox: Voltage  
Controlled Silicon Oscillator  
FEATURES  
DESCRIPTION  
The LTC®6990 is a precision silicon oscillator with a pro-  
grammable frequency range of 488Hz to 2MHz. It can be  
used as a fixed-frequency or voltage-controlled oscillator  
(VCO). The LTC6990 is part of the TimerBlox™ family of  
versatile silicon timing devices.  
n
Fixed-Frequency or Voltage-Controlled Operation  
– Fixed: Single Resistor Programs Frequency  
with <2.2% Max Error  
– VCO: Two Resistors Set VCO Center  
Frequency and Tuning Range  
n
Frequency Range: 488Hz to 2MHz  
A single resistor, R , programs the LTC6990’s inter-  
SET  
n
2.25V to 5.5V Single Supply Operation  
nal master oscillator frequency. The output frequency  
n
72μA Supply Current at 100kHz  
is determined by this master oscillator and an internal  
n
500μs Start-Up Time  
frequency divider, N , programmable to eight settings  
DIV  
n
VCO Bandwidth >300kHz at 1MHz  
from 1 to 128.  
n
CMOS Logic Output Sources/Sinks 20mA  
n
50% Duty Cycle Square Wave Output  
1MHz 50kΩ  
NDIV RSET  
fOUT  
=
•
,NDIV = 1, 2, 4 …128  
n
Output Enable (Selectable Low or Hi-Z When Disabled)  
n
–40°C to 125°C Operating Temperature Range  
Optionally,asecondresistorattheSETinputprovideslinear  
voltage control of the output frequency and can be used  
for frequency modulation. A narrow or wide VCO tuning  
range can be configured by the appropriate selection of  
the two resistors.  
n
Available in Low Profile (1mm) SOT-23 (ThinSOT™)  
and 2mm × 3mm DFN Package  
APPLICATIONS  
n
Low Cost Precision Programmable Oscillator  
n
Voltage-Controlled Oscillator  
The LTC6990 includes an enable function that is synchro-  
nizedwiththemasteroscillatortoensureclean,glitch-free  
output pulses. The disabled output can be configured to  
be high impedance or forced low.  
n
High Vibration, High Acceleration Environments  
n
Replacement for Fixed Crystal and Ceramic Oscillators  
n
Portable and Battery-Powered Equipment  
L, LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks of  
Linear Technology Corporation. TimerBlox and ThinSOT are trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.  
Patents including 6342817, 6614313.  
The LTC6990 is available in the 6-lead SOT-23 (ThinSOT)  
package or a 6-lead 2mm × 3mm DFN.  
TYPICAL APPLICATION  
Voltage Controlled Oscillator with 16:1 Frequency Range  
VCO Transfer Function  
1000  
MHz  
V
f
ꢀ 1MHz ꢁ V • 0.5  
CTRL  
+
OUT  
V
750  
500  
250  
0
OE  
OUT  
LTC6990  
+
V
+
GND  
V
C1  
0.1μF  
R
VCO  
100k  
V
SET  
DIV  
CTRL  
6990 TA01a  
R
SET  
100k  
0
0.5  
1
1.5  
2
V
CTRL  
(V)  
6990 TA01b  
6990f  
1
1234567...28

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