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PDF DS1090 Data sheet ( Hoja de datos )

Número de pieza DS1090
Descripción Spread-Spectrum EconOscillator
Fabricantes Maxim Integrated Products　
Logotipo Maxim Integrated Products Logotipo



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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
45kΩ
TO 91kΩ
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.

1 page




DS1090 pdf
Low-Frequency, Spread-Spectrum
EconOscillator
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
OUTPUT FREQUENCY
vs. TEMPERATURE
10
VCC = 3.3V
9
8 40kΩ
7 60kΩ
80kΩ
6
5
4
-40
-15 10 35 60
TEMPERATURE (°C)
85
DUTY CYCLE
vs. TEMPERATURE
52
RSET = 40kΩ
51
VCC = 3.3V
50
VCC = 5V
49
DS1090U-1
48
-40
-15 10
35
TEMPERATURE (°C)
60
85
18
16
14
12
10
8
40
RESISTOR CURRENT
vs. RESISTOR VALUE
VCC = 3.3V, TA = +25°C
50 60 70
RSET (kΩ)
80
FREQUENCY ERROR
vs. SUPPLY VOLTAGE (FROM 3.3V)
5.0
TA = +25°C
2.5
80kΩ
0
-2.5 40kΩ
60kΩ
-5.0
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
FREQUENCY ERROR
vs. TEMPERATURE (FROM +25°C)
2.0
VCC = 3.3V
60kΩ
1.0
0
80kΩ
-1.0
40kΩ
-2.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
POWER SPECTRUM vs. SPREAD
0
OFF
-10
-20
±2%
VCC = 3.3V,
TA = +25°C,
JC0 = JC1 = 1
-30
±4%
-40
±8%
-50
-60
-70
-80
4.80
5.35
FREQUENCY (MHz)
5.90
_____________________________________________________________________ 5

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