參數(shù)資料
型號(hào): LTC1799
廠商: Linear Technology Corporation
英文描述: 1kHz to 30MHz Resistor Set SOT-23 Oscillator(1kHz ~30MHz電阻器調(diào)整頻率振蕩器)
中文描述: 1kHz到30MHz的電阻設(shè)置的SOT - 23振蕩器(1kHz時(shí)?30MHz的電阻器調(diào)整頻率振蕩器)
文件頁(yè)數(shù): 1/4頁(yè)
文件大?。?/td> 120K
代理商: LTC1799
LTC1799
1
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
One External Resistor Sets the Frequency
I
1kHz to 30MHz Frequency Range
I
SOT-23 Miniature Package
I
Frequency Error
1.5% 5kHz to 20MHz
(T
A
= 25
°
C)
I
Frequency Error
2% 5kHz to 20MHz
(T
A
= 0
°
C to 70
°
C)
I
±
40ppm/
°
C Temperature Stability
I
0.05%/V Supply Stability
I
50%
±
1% Duty Cycle 1kHz to 2MHz
I
50%
±
5% Duty Cycle 2MHz to 20MHz
I
1mA Typical Supply Current
I
100
CMOS Output Driver
I
Operates from a Single 2.7V to 5.5V Supply
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
1kHz to 30MHz
Resistor Set SOT-23 Oscillator
January 2001
Final Electrical Specifications
I
Low Cost Precision Oscillator
I
Charge Pump Driver
I
Switching Power Supply Clock Reference
I
Clocking Switched Capacitor Filters
I
Fixed Crystal Oscillator Replacement
I
Ceramic Oscillator Replacement
I
Small Footprint Replacement for Econ Oscillators
APPLICATIOU
The LTC
1799 is a precision 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 LTC1799 has been designed for high accuracy
operation (
1.5% frequency error) without the need for
external trim components.
The LTC1799 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 3.32k to 1M to select a master
oscillator frequency between 100kHz and 30MHz (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 30MHz (5V supply). The LTC1799 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:
V+
1
2
3
5
5kHz
f
OSC
20MHz
V
+
V
+
GND
5k
R
SET
200k
0.1
μ
F
1799 TA01
4
GND
LTC1799
SET
OUT
DIV
Hi-Z
÷
10
÷
100
÷
10
U
25
20
15
10
5
0
–1.25
–0.75
–0.25 0 0.25
FREQUENCY ERROR (%)
0.75
1.25
1799 TA02
Basic Connection
Typical Distribution of Frequency Error, T
A
= 25
°
C
f
MHz
k
N R
N
Hi Z
-
GND
OSC
SET
=
=
=
=
=
+
10
10
100
10
1
,
,
,
,
DIVPIN
DIVPIN
DIVPIN
V
SOT-23 Actual Size
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