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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1090 Datasheet

Spread-Spectrum EconOscillator

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DS1090 pdf
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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
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1090 Datasheet

Spread-Spectrum EconOscillator

No Preview Available !

DS1090 pdf
Low-Frequency, Spread-Spectrum
EconOscillator
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to Ground ...........-0.5V to +6.0V
Voltage Range on Input Pins
Relative to Ground.................................-0.5V to (VCC + 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.
RECOMMENDED DC OPERATING CONDITIONS
(TA = -40°C to +85°C)
PARAMETER
Supply Voltage
SYMBOL
VCC (Note 1)
CONDITIONS
Input Logic 1 (J0, J1, JC0, JC1)
VIH
Input Logic 0 (J0, J1, JC0, JC1)
VIL
MIN
3.0
0.7 x
VCC
-0.3
TYP
MAX
5.5
VCC +
0.3
+0.3 x
VCC
UNITS
V
V
V
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
Supply Current
High-Level Output Voltage (OUT)
Low-Level Output Voltage (OUT)
High-Level Input Current
(J0, J1, JC0, JC1)
SYMBOL
ICC
VOH
VOL
CONDITIONS
CL = 15pF, VCC = 3.3V, RSET = 40k
CL = 15pF, VCC = 5.5V, RSET = 40k
IOH = -4mA
VCC = min
IOL = 4mA
IIH VIH = VCC
Low-Level Input Current
(J0, J1, JC0, JC1)
IIL VIL = 0V
Resistor Current
IRES
VCC = max
MIN TYP MAX UNITS
1.4
mA
1.7 3
2.4 V
0.4 V
+1.0
µA
-1.0 µA
150 µA
2 _____________________________________________________________________


Part Number DS1090
Description Spread-Spectrum EconOscillator
Maker Maxim Integrated Products
Total Page 8 Pages
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