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DS1090 Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer DS1090
Beschreibung Spread-Spectrum EconOscillator
Hersteller Maxim Integrated Products
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Gesamt 8 Seiten
DS1090 Datasheet, Funktion
www.DataSheet4U.com
Rev 0; 4/04
Low-Frequency, Spread-Spectrum
EconOscillator
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
Typical Operating Circuit
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
Ordering Information
PART
OUTPUT
FREQUENCY
RANGE
PRESCALER
PIN-
PACKAGE
DS1090U-1 4MHz to 8MHz
1 8 µSOP
DS1090U-2* 2MHz to 4MHz
2 8 µSOP
DS1090U-4* 1MHz to 2MHz
4 8 µSOP
DS1090U-8* 500kHz to 1MHz 8 8 µSOP
DS1090U-16 250kHz to
500kHz
16 8 µSOP
DS1090U-32* 125kHz to
250kHz
Add “/T” for Tape & Reel orders.
*Contact factory for availability.
32 8 µSOP
Pin Configuration
VIN
45k
TO 91k
VCC
VCC OUT
JC0
DS1090 JC1
RSET J0
J1
GND
DC-DC
STEP-DOWN
CONVERTER
VOUT
TOP VIEW
OUT 1
RSET 2
VCC 3
GND 4
DS1090
µSOP
8 JC1
7 JC0
6 J1
5 J0
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.






DS1090 Datasheet, Funktion
Low-Frequency, Spread-Spectrum
EconOscillator
Pin Description
PIN NAME
FUNCTION
1 OUT Oscillator Output
2 RSET Frequency Control Resistor Input
3 VCC Positive-Supply Terminal
4 GND Ground
5 J0 Dither Amplitude (Percentage) Inputs
6 J1 (see Table 2)
7 JC0
Dither Rate Divisor Inputs (see Table 1)
8 JC1
Block Diagram
RSET VOLTAGE-
BIAS CIRCUIT
DS1090
+
MASTER
OSCILLATOR
(VCO)
fMOSC
FACTORY
PROGRAMMED
PRESCALER
fOSC fOUT
BUFFER
OUT
+
(÷ 1, 2, 4, 8, 16, OR 32)
4MHz–8MHz
VCC
VCC
GND
+ DITHER
- AMPLITUDE
(0, 2, 4, OR 8%)
DITHER GENERATOR
fMOD
TRIANGLE
GENERATOR
(÷ 128)
DITHER RATE
(÷ 4, 8, 16, OR 32)
J0
J1
JC0
JC1
6 _____________________________________________________________________

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