DS1090：Low-Frequency, Spread-Spectrum EconOscillator _ BDTIC a Leading Distributor in China

DS1090：Low-Frequency, Spread-Spectrum EconOscillator

Industry's Only Spread-Spectrum Resistor-Programmable Oscillator

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.

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

DS1090: Typical Operating Circuit

Applications/Uses

Embedded Microcontrollers
Industrial Controls
Printers
Servers
Switch-Mode Power Supplies

DataSheet

title	Download file
DS1090 Data Sheet	DS1090.pdf

Parametrics

Part Number	f_OUT (MHz)	f_OUT (kHz)	Δf_OUT (%)	User Prog. f_OUT	Spread Spectrum	V_CC (V)	Reset Out	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	max	min	max	User Prog. f_OUT	Spread Spectrum	V_CC (V)	Reset Out	Oper. Temp. (°C)	Package/Pins	See Notes
DS1090	8	125	±2.5 (-40 to +85°C)	External Resistors	Yes	3.0 to 5.5	No	-40 to +85	µMAX/8	$0.83 @1k

Quality and Environmental Data

DS1090.pdf

Ordering Information

Part Number	Notes	Status	Recommended Replacement	Package	Temp	RoHS
DS1090U		No Longer Available	DS1090U+	µMAX,;8 pin;15.6 mm²	-40°C to +85°C	No
DS1090U-1+		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-1+T		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-16+		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-16+T		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-2	Resistor Prog. 2MHz to 4MHz, 3V to 5.5V	No Longer Available	DS1090U-2+	µMAX,;8 pin;15.6 mm²	-40°C to +85°C	No
DS1090U-2+		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-2+T		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-2+W		No Longer Available		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-2/V+		NRND		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
Part Number	Notes	Status	Recommended Replacement	Package	Temp	RoHS
DS1090U-2/V+T		NRND		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-32+		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-32+T		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-4	Resistor Prog. 1MHz to 2MHz, 3V to 5.5V	No Longer Available	DS1090U-4+	µMAX,;8 pin;15.6 mm²	-40°C to +85°C	No
DS1090U-4+		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-4+T		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-8+		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-8+T		Active		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-8/V+		No Longer Available		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free
DS1090U-8/V+T		No Longer Available		µMAX,;8 pin;15.6 mm²	-40°C to +85°C	Lead Free