The DS1090 is a low-cost, dithered oscillator intended
to be used as an external clock for switched-mode
power supplies and other low-frequency applications.
The dithering or sweeping function reduces peak-radi-
ated emissions from the power supply at its fundamen-
tal frequency, as well as harmonic frequencies. The
device consists of a resistor-programmed master oscil-
lator, factory-programmed clock prescaler, and a pin-
programmed dither circuit. These features allow the
DS1090 to be used in applications where a spread-
spectrum clock is desired to reduce radiated emis-
sions. A combination of factory-set prescalers and
external resistor allows for output frequencies ranging
from 125kHz to 8MHz. Both dither frequency and dither
percentage are set using control pins.
Features
♦
Low-Cost, Spread-Spectrum EconOscillator™
♦
Simple User Programming
♦
Output Frequency Programmable from 125kHz
to 8MHz
♦
Dither Percentage Programmable from 0% to 8%
♦
Dither Rate Programmable (f
MOSC
/ 512, 1024,
2048, or 4096 )
♦
3.0V to 5.5V Single-Supply Operation
♦
CMOS/TTL-Compatible Output
♦
Operating Temperature Range: -40°C to +85°C
DS1090
Ordering Information
PART
OUTPUT
FREQUENCY
RANGE
4MHz to 8MHz
2MHz to 4MHz
1MHz to 2MHz
500kHz to 1MHz
250kHz to
500kHz
125kHz to
250kHz
PRESCALER
1
2
4
8
16
32
PIN-
PACKAGE
8 µSOP
8 µSOP
8 µSOP
8 µSOP
8 µSOP
8 µSOP
Applications
Switched-Mode Power Supplies
Servers
Printers
Embedded Microcontrollers
Industrial Controls
Automotive Applications
DS1090U-1
DS1090U-2*
DS1090U-4*
DS1090U-8*
DS1090U-16
DS1090U-32*
Add “/T” for Tape & Reel orders.
*Contact
factory for availability.
Typical Operating Circuit
V
IN
V
OUT
Pin Configuration
TOP VIEW
V
CC
DC-DC
STEP-DOWN
CONVERTER
OUT
JC0
OUT 1
R
SET
2
8
7
JC1
JC0
J1
J0
V
CC
DS1090
V
CC
3
6
5
GND 4
DS1090
JC1
R
SET
45kΩ
TO 91kΩ
GND
J0
J1
µSOP
EconOscillator is a trademark of Dallas Semiconductor.
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Frequency, Spread-Spectrum
EconOscillator
DS1090
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Relative to Ground ...........-0.5V to +6.0V
Voltage Range on Input Pins
Relative to Ground.................................-0.5V to (V
CC
+ 0.5V),
not to exceed 6.0V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
I use Mr. Ma Baohua's Snooper. Do I need your special card reader? I have a SIM card reader but the software cannot connect. I want to check the content of the text message sent by executing the STK m...
I would like to ask what the following KernelIoControl call means. I checked the explanation under pb and I can’t understand it. #define IOCTL_POCKETSTOREII_CMD CTL_CODE(FILE_DEVICE_HAL, 4080, METHOD_...
The SD card protocol is easy to find. But the SDHC protocol is hard to find. I have been looking for it for two days but still can't find it. Which one has the SDHC protocol? Can you send me a copy? T...
I have been working on the OV7670 driver recently, and there are some problems that confuse me. I would like to ask you for help.
I used the modulus software to draw a rectangle of 320*240 with a widt...
As medical equipment develops towards intelligence, miniaturization, serialization, digitization, and multi-functions, the logic control devices in medical equipment have also evolved from medium- a...[Details]
introduction
Oxygen is an important substance for human metabolism. Brain tissue has a high metabolic rate and consumes about 20% of the total oxygen in the body. In the clinical rescue and ...[Details]
Overview
PS pressure sensor is an electronic pressure sensor made of semiconductor diaphragm structure. It can convert the physical quantity of air pressure into electrical signals and detect ...[Details]
At present, the global medical electronics industry is gradually showing attractive development prospects, and the speed of product replacement is constantly increasing. At the same time, due to the p...[Details]
The 21st century is the century of life and health. The rapid progress of life sciences continues to promote human understanding of their own health and diseases. How to develop innovative medical ele...[Details]
Preface
TD-SCDMA mobile communication standard is the world's third-generation mobile communication standard with independent intellectual property rights in my country. It has become a highli...[Details]
As the demand for wireless and wired services in the communications market continues to grow, the telecommunications industry recognizes the need to break away from the shackles of proprietary or p...[Details]
Popular consumer electronics products such as game consoles, digital televisions (DTVs) and personal computers are becoming more and more versatile and feature higher performance. The enhanced data...[Details]
DC regulated power supply is a commonly used electronic device, which can ensure stable output voltage when the grid voltage fluctuates or the load changes. A low ripple, high-precision regulated p...[Details]
The overcurrent and overheating coordinated protection technology implemented by polymer positive temperature coefficient devices (PPTC) can protect motors, controllers and electronic components in...[Details]
introduction
When we run or ride a bicycle, the vibration of our arms often makes the images displayed on the electronic devices in our hands look blurry. Long-term viewing (such as watchi...[Details]
In order to meet the requirements of video systems, industrial and medical display and video transmission applications such as eliminating the limitation of long connection cables, increasing data ...[Details]
MOSFETs are widely used as power switching elements in regulators and motor controllers. They are available as discrete devices or integrated into ICs in various H-bridge configurations.
A hig...[Details]
In a Class D audio power amplifier, the preamplifier is a relatively important module. It is located at the front of the entire topology and completes the processing of the input signal source,...[Details]
Two doctors in Chennai, a major technology city in southern India, have developed a generator installed in the high heels. The generator generates weak electricity through the vibration and pressure o...[Details]
Embedded System
京公网安备 11010802033920号
EEWORLD
