LTC1799CS5 Linear Technology, LTC1799CS5 Datasheet

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LTC1799CS5

Manufacturer Part Number
LTC1799CS5
Description
Manufacturer
Linear Technology
Type
Silicon Oscillatorr
Datasheet

Specifications of LTC1799CS5

Mounting Style
Surface Mount
Screening Level
Commercial
Product Length (mm)
2.9mm
Product Depth (mm)
1.75mm
Product Height (mm)
0.9mm
Package / Case
TSOT-23
Lead Free Status / RoHS Status
Not Compliant

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents including 6342817 and 6614313.
All other trademarks are the property of their respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation.
One External Resistor Sets the Frequency
Fast Start-Up Time: < 1ms
1kHz to 33MHz Frequency Range
Frequency Error ≤1.5% 5kHz to 20MHz
(T
Frequency Error ≤ 2% 5kHz to 20MHz
(T
±40ppm/°C Temperature Stability
0.05%/V Supply Stability
50% ±1% Duty Cycle 1kHz to 2MHz
50% ±5% Duty Cycle 2MHz to 20MHz
1mA Typical Supply Current
100Ω CMOS Output Driver
Operates from a Single 2.7V to 5.5V Supply
Low Profile (1mm) SOT-23 (ThinSOT™ Package)
Low Cost Precision Oscillator
Charge Pump Driver
Switching Power Supply Clock Reference
Clocking Switched Capacitor Filters
Fixed Crystal Oscillator Replacement
Ceramic Oscillator Replacement
Small Footprint Replacement for Econ Oscillators
A
A
3k ≤ R
= 25°C)
= 0°C to 70°C)
SET
≤ 1M
5V
0.1µF
U
TSOT-23 Actual Size
Basic Connection
1
2
3
V
GND
SET
LTC1799
+
1799 TA01
OUT
U
DIV
5
4
1kHz ≤ f
÷100
÷1
OSC
5V
÷10
≤ 33MHz
OPEN
Resistor Set SOT-23 Oscillator
DESCRIPTIO
The LTC
and occupies very little PC board space. The oscillator
frequency is programmed by a single external resistor
(R
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 3k to 1M to select a master
oscillator frequency between 100kHz and 33MHz (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 33MHz (5V supply). The LTC1799 features a proprietary
feedback loop that linearizes the relationship between
R
calculate frequency. The oscillator can be easily pro-
grammed using the simple formula outlined below:
f
OSC
SET
SET
). The LTC1799 has been designed for high accuracy
=
and frequency, eliminating the need for tables to
10
®
1799 is a precision oscillator that is easy to use
MHz
T
Typical Distribution of Frequency Error,
A
25
20
15
10
–1.25
= 25°C (5kHz ≤ f
5
0
–0.75
N R
U
10
FREQUENCY ERROR (%)
k
SET
–0.25 0 0.25
1kHz to 33MHz
OSC
,
N
≤ 20MHz, V
=
100
10
1
0.75
,
,
1799 TA02
,
LTC1799
DIV Pin V
DIV Pin Open
DIV Pin GND
+
1.25
= 5V)
sn1799 1799fbs
=
=
=
+
1

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LTC1799CS5 Summary of contents

Page 1

... Ceramic Oscillator Replacement ■ Small Footprint Replacement for Econ Oscillators , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ThinSOT is a trademark of Linear Technology Corporation. Protected by U.S. Patents including 6342817 and 6614313. ...

Page 2

... SET 10k, Pin ∞ SET Pin Pin ORDER PART NUMBER LTC1799CS5 5 OUT LTC1799IS5 LTC1799HS5 4 DIV S5 PART MARKING LTND = 256°C/W LTNE LTND = 5pF, unless otherwise noted. L MIN TYP MAX UNITS ±0.5 ±1.5 ● ±2 ● ±2.5 ±2.5 ±2.5 ±0.5 ± ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T All voltages are with respect to GND. SYMBOL PARAMETER V High Level Output Voltage (Note Low Level Output Voltage (Note OUT Rise Time r (Note ...

Page 4

LTC1799 W U TYPICAL PERFOR A CE CHARACTERISTICS Frequency Variation vs R SET 25°C A GUARANTEED LIMITS APPLY 3 OVER 5k TO 200k RANGE –1 –2 –3 – SET Peak-to-Peak Jitter ...

Page 5

CTIO (Pin 1): Voltage Supply (2.7V ≤ V must be kept free from noise and ripple. It should be bypassed directly to a ground plane with a 0.1µF capacitor. GND (Pin 2): ...

Page 6

LTC1799 THEORY OF OPERATIO As shown in the Block Diagram, the LTC1799’s master oscillator is controlled by the ratio of the voltage between + the V and SET pins and the current entering the SET pin (I ). The voltage ...

Page 7

U U APPLICATIO S I FOR ATIO SELECTING THE DIVIDER SETTING AND RESISTOR The LTC1799’s master oscillator has a frequency range spanning 0.1MHz to 33MHz. However, accuracy may suffer if the master oscillator is operated at greater than 10MHz with ...

Page 8

LTC1799 U U APPLICATIO S I FOR ATIO POWER SUPPLY REJECTION Low Frequency Supply Rejection (Voltage Coefficient) Figure 5 shows the output frequency sensitivity to power supply voltage at several different temperatures. The LTC1799 has a conservative guaranteed voltage coeffi- ...

Page 9

U U APPLICATIO S I FOR ATIO Jitter The typical jitter is listed in the Electrical Characteristics and shown in the Typical Performance Characteristics. These specifications assume that the capacitance on SET (Pin 3) is limited to less than 10pF, ...

Page 10

LTC1799 Once known, calculate R IN SET 10 MHz • • = SET N f OSC MAX ( ) ⎡ R ⎛ − ⎜ ⎢ ...

Page 11

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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. U ...

Page 12

... TA08 1400 1200 10MHz 10k f = • OSC 1000 800 600 400 200 www.linear.com ● 5 OUT 4 DIV Output Frequency vs Temperature MAX TYP MIN 0 –20 – TEMPERATURE (°C) 1799 TA04 LT/TP 0804 1K REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2001 sn1799 1799fbs ...

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