DS1090U-1+ Maxim Integrated Products, DS1090U-1+ Datasheet

IC ECONOSCILLATOR SS 8-USOP

DS1090U-1+

Manufacturer Part Number
DS1090U-1+
Description
IC ECONOSCILLATOR SS 8-USOP
Manufacturer
Maxim Integrated Products
Series
EconOscillator™r
Type
Clock Generatorr
Datasheet

Specifications of DS1090U-1+

Pll
No
Input
Clock
Output
CMOS, TTL
Number Of Circuits
1
Ratio - Input:output
1:1
Differential - Input:output
No/No
Frequency - Max
8MHz
Divider/multiplier
Yes/No
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Frequency-max
8MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
Rev 1; 2/07
EconOscillator is a trademark of Dallas Semiconductor.
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.
TO 91kΩ
45kΩ
Switched-Mode Power Supplies
Servers
Printers
Embedded Microcontrollers
Industrial Controls
Automotive Applications
R
SET
DS1090
Typical Operating Circuit
V
V
GND
CC
CC
V
IN
OUT
JC0
JC1
J0
J1
General Description
STEP-DOWN
CONVERTER
DC-DC
Low-Frequency, Spread-Spectrum
Applications
______________________________________________ Maxim Integrated Products
V
OUT
♦ Low-Cost, Spread-Spectrum EconOscillator™
♦ Simple User Programming
♦ Output Frequency Programmable from 125kHz
♦ Dither Percentage Programmable from 0% to 8%
♦ Dither Rate Programmable (f
♦ 3.0V to 5.5V Single-Supply Operation
♦ CMOS/TTL-Compatible Output
♦ Operating Temperature Range: -40°C to +85°C
Add “T” for Tape & Reel orders.
DS1090U-1+
DS1090U-2+
DS1090U-4+
DS1090U-8+
DS1090U-16+
DS1090U-32+
to 8MHz
2048, or 4096 )
TOP VIEW
PART
R
GND
OUT
V
OUTPUT
FREQUENCY
RANGE
4MHz to 8MHz
2MHz to 4MHz
1MHz to 2MHz
500kHz to
1MHz
250kHz to
500kHz
125kHz to
250kHz
SET
CC
1
2
4
3
EconOscillator
Ordering Information
DS1090
μSOP
Pin Configuration
PRESCALER
MOSC
7
6
5
8
16
32
1
2
4
8
JC1
JC0
J1
J0
/ 512, 1024,
Features
PIN-
PACKAGE
8 μSOP
8 μSOP
8 μSOP
8 μSOP
8 μSOP
8 μSOP
1

Related parts for DS1090U-1+

DS1090U-1+ Summary of contents

Page 1

... Dither Percentage Programmable from ♦ Dither Rate Programmable (f 2048, or 4096 ) ♦ 3.0V to 5.5V Single-Supply Operation ♦ CMOS/TTL-Compatible Output ♦ Operating Temperature Range: -40°C to +85°C PART DS1090U-1+ DS1090U-2+ DS1090U-4+ DS1090U-8+ DS1090U-16+ DS1090U-32+ Add “T” for Tape & Reel orders. ...

Page 2

Low-Frequency, Spread-Spectrum EconOscillator ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to Ground ...........-0.5V to +6.0V CC Voltage Range on Input Pins Relative to Ground.................................-0. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to ...

Page 3

AC ELECTRICAL CHARACTERISTICS (V = +3.0V to +5.5V -40°C to +85°C, unless otherwise noted PARAMETER SYMBOL Internal Master Oscillator f Frequency Output Frequency Tolerance Voltage Frequency Variation Temperature Frequency Variation Peak-to-Peak Dither (3 ) (Note 5) ...

Page 4

Low-Frequency, Spread-Spectrum EconOscillator (V = +3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.70 NO LOAD +25°C A 1.45 40kΩ 1.20 60kΩ 0.95 80kΩ 0.70 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE ...

Page 5

... SUPPLY VOLTAGE (V) Low-Frequency, Spread-Spectrum Typical Operating Characteristics (continued) DUTY CYCLE vs. TEMPERATURE 52 R SET 3. DS1090U -40 - TEMPERATURE (°C) FREQUENCY ERROR vs. TEMPERATURE (FROM +25°C) 2 3.3V CC 60kΩ 1.0 0 -1.0 40kΩ -2.0 5.5 -40 -15 10 ...

Page 6

Low-Frequency, Spread-Spectrum EconOscillator Pin Description PIN NAME FUNCTION 1 OUT Oscillator Output 2 R Frequency Control Resistor Input SET 3 V Positive-Supply Terminal CC 4 GND Ground 5 J0 Dither Amplitude (Percentage) Inputs (see Table JC0 ...

Page 7

MASTER OSCILLATOR FREQUENCY vs. EXTERNAL RESISTOR SELECTION RESISTANCE (kΩ) SET Figure 1. Master Oscillator Frequency Detailed Description The DS1090 is a center-dithered, spread-spectrum sili- con oscillator for use ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation ...

Related keywords