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DS1090U-1 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # DS1090U-1
Description  Low-Frequency, Spread-Spectrum EconOscillator
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1090U-1 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
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.
Applications
Switched-Mode Power Supplies
Servers
Printers
Embedded Microcontrollers
Industrial Controls
Automotive Applications
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 (fMOSC / 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
Low-Frequency, Spread-Spectrum
EconOscillator
______________________________________________ Maxim Integrated Products
1
J1
J0
GND
1
2
8
7
JC1
JC0
RSET
VCC
OUT
µSOP
TOP VIEW
3
4
6
5
DS1090
Pin Configuration
Ordering Information
DS1090
VOUT
VIN
DC-DC
STEP-DOWN
CONVERTER
OUT
GND
VCC
VCC
RSET
JC0
JC1
J0
J1
45k
TO 91k
Typical Operating Circuit
Rev 0; 4/04
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.
Add “/T” for Tape & Reel orders.
*Contact factory for availability.
PART
OUTPUT
FREQUENCY
RANGE
PRESCALER
PIN-
PACKAGE
DS1090U-1
4MHz to 8MHz
18 µSOP
DS1090U-2*
2MHz to 4MHz
28 µSOP
DS1090U-4*
1MHz to 2MHz
48 µSOP
DS1090U-8*
500kHz to 1MHz
88 µSOP
DS1090U-16
250kHz to
500kHz
16
8 µSOP
DS1090U-32*
125kHz to
250kHz
32
8 µSOP
EconOscillator is a trademark of Dallas Semiconductor.


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