DS1090 查看數據表（PDF） - Maxim Integrated
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DS1090 Datasheet PDF : 9 Pages
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DS1090
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-radiated
emissions from the power supply at its fundamental
frequency, as well as harmonic frequencies. The device
consists of a resistor-programmed master oscillator, fac-
tory-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 emissions. 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
Typical Operating Circuit
VIN
VOUT
45kΩ
TO 91kΩ
VCC
VCC OUT
JC0
DS1090 JC1
RSET
J0
J1
GND
DC-DC
STEP-DOWN
CONVERTER
EconOscillator is a trademark of Maxim Integrated Products, Inc.
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
DS1090U-1+
DS1090U-2+
DS1090U-4+
DS1090U-8+
DS1090U-16+
DS1090U-32+
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
Add “T” for Tape & Reel orders.
Pin Configuration
TOP VIEW
OUT 1
RSET 2
VCC 3
GND 4
DS1090
µSOP
8 JC1
7 JC0
6 J1
5 J0
19-7500; Rev 3; 9/16
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