LTC1799
1kHz to 33MHz
Resistor Set SOT-23 Oscillator
Fea T Descrip T
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One External Resistor Sets the Frequency The LTC 1799 is a precision oscillator that is easy to use
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Fast Start-Up Time: <1ms and occupies very little PC board space. The oscillator
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1kHz to 33MHz Frequency Range frequency is programmed by a single external resistor
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Frequency Error 1.5% 5kHz to 20MHz (R ). The LTC1799 has been designed for high accuracy
SET
(T = 25C) operation (1.5% frequency error) without the need for
A
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Frequency Error 2% 5kHz to 20MHz external trim components.
(T = 0C to 70C)
A
The LTC1799 operates with a single 2.7V to 5.5V power
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40ppm/C Temperature Stability
supply and provides a rail-to-rail, 50% duty cycle square
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0.05%/V Supply Stability
wave output. The CMOS output driver ensures fast rise/
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50% 1% Duty Cycle 1kHz to 2MHz
fall times and rail-to-rail switching. The frequency-setting
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50% 5% Duty Cycle 2MHz to 20MHz
resistor can vary from 3k to 1M to select a master oscil-
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1mA Typical Supply Current
lator frequency between 100kHz and 33MHz (5V supply).
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100 CMOS Output Driver
The three-state DIV input determines whether the master
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Operates from a Single 2.7V to 5.5V Supply
clock is divided by 1, 10 or 100 before driving the out-
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Low Profile (1mm) SOT-23 (ThinSOT Package)
put, providing three frequency ranges spanning 1kHz to
33MHz (5V supply). The LTC1799 features a proprietary
a T
feedback loop that linearizes the relationship between R
SET
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Low Cost Precision Oscillator
and frequency, eliminating the need for tables to calculate
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Charge Pump Driver
frequency. The oscillator can be easily programmed using
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Switching Power Supply Clock Reference
the simple formula outlined below:
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Clocking Switched Capacitor Filters
+
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DIV Pin = V
Fixed Crystal Oscillator Replacement 100,
10k
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Ceramic Oscillator Replacement
f = 10MHz , N =
10,
DIV Pin = Open
OSC
n N R
Small Footprint Replacement for Econ Oscillators
SET
1,
DIV Pin = GND
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 6342817 and 6614313.
Typical Distribution of Frequency Error,
+
Typical a T
T = 25C (5kHz f 20MHz, V = 5V)
A OSC
25
Basic Connection
20
1kHz f 33MHz
OSC
5V
1 5
+
V OUT
15
0.1F LTC1799
2
5V
3k R 1M
SET GND
100
3 4 10 10
SET DIV OPEN
1
1799 TA01
5
0
TSOT-23 Actual Size
1.25 0.75 0.25 0 0.25 0.75 1.25
FREQUENCY ERROR (%)
1799 TA02
1799fd
1
For more information www.linear.com/LTC1799
UNITS (%)
ion pplica
ions pplica
ion uresLTC1799
a Te Maxi Mu M r a T p in c F T
(Note 1)
TOP VIEW
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Supply Voltage (V ) to GND ......................... 0.3V to 6V
+
+ V 1 5 OUT
DIV to GND .....................................0.3V to (V + 0.3V)
GND 2
+
SET to GND .....................................0.3V to (V + 0.3V)
SET 3 4 DIV
Operating Temperature Range
S5 PACKAGE
LTC1799C ................................................ 0C to 70C
5-LEAD PLASTIC TSOT-23
T = 150C, = 256C/W
LTC1799I .............................................40C to 85C JMAX JA
LTC1799H .......................................... 40C to 125C
Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec) ...................300C
o r Der i n F Ma T