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DS1090
Low-Frequency, Spread-Spectrum EconOscillator
Industry's Only Spread-Spectrum Resistor-Programmable Oscillator
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Status
Active: In Production.
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, 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 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.
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Data Sheet
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Key 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
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Applications/Uses
- Automotive Applications
- Embedded Microcontrollers
- Industrial Controls
- Printers
- Servers
- Switch-Mode Power Supplies
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Key Specifications:
| Silicon Oscillators |
| Part Number |
fOUT
(MHz) |
fOUT
(kHz) |
ΔfOUT
(%) |
User Prog. fOUT |
Spread Spectrum |
VCC
(V) |
Reset Out |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max |
min |
max |
max w/pins |
See Notes |
| DS1090 |
8 |
125 |
±2.5 (-40 to +85°C) |
External Resistors |
Yes |
3.0 to 5.5 |
No |
-40 to +85 |
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16.2 |
$0.71 @1k |
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See All Silicon Oscillators (17)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Rev 1;
2007-02-26
This page last modified: 2010-12-13
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