DatasheetsPDF.com

DS1090 Dataheets PDF



Part Number DS1090
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Spread-Spectrum EconOscillator
Datasheet DS1090 DatasheetDS1090 Datasheet (PDF)

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, factory-programmed clock prescaler, and a pin-progr.

  DS1090   DS1090


Document
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, 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. Applications ●● Switched-Mode Power Supplies ●● Servers ●● Printers ●● Embedded Microcontrollers ●● Industrial Controls Typical Operating Circuit VIN 45kΩ TO 91kΩ VCC VCC OUT JC0 DS1090 JC1 RSET J0 J1 GND DC-DC STEP-DOWN CONVERTER VOUT EconOscillator is a trademark of Maxim Integrated Products, Inc. Features ●● Low-Cost, Spread-Spectrum EconOscillator™ ●● Simple User Programming ●● O utput 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 DS1090U-1+ DS1090U-2+ DS1090U-4+ 4MHz to 8MHz 2MHz to 4MHz 1MHz to 2MHz DS1090U-8+ 500kHz to 1MHz DS1090U-16+ 250kHz to 500kHz DS1090U-32+ 125kHz to 250kHz Add “T” for Tape & Reel orders. PRESCALER 1 2 4 8 16 32 PINPACKAGE 8 µSOP 8 µSOP 8 µSOP 8 µSOP 8 µSOP 8 µSOP 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 DS1090 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) SYMBOL ICC VOH VOL CONDITIONS CL = 15pF, VCC = 3.3V, RSET = 40kΩ CL = 15pF, VCC = 5.5V, RSET = 40kΩ IOH = -4mA VCC = min IOL = 4mA High-Level Input Current (J0, J1, JC0, JC1) IIH VIH = VCC Low-Level Input Current (J0, J1, JC0, JC1) Resistor Current IIL IRES VIL = 0V VCC = max MIN TYP MAX UNITS 1.4 1.7 3 mA 2.4 V 0.4 V +1.0 µA -1.0 µA 150 µA www.maximintegrated.com Maxim Integrated │  2 DS1090 Low-Frequency, Spread-Spectrum EconOscillator AC Electrical Characteristics (VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS Internal Master Oscillator Frequency fMOSC Output Frequency Tolerance Voltage Frequency Variation Temperature Frequency Variation ∆fOUT ∆fOUT ∆fOUT VCC = 3.3V, TA = +25°C TA = +25°C, RSET = 60kΩ, VCC = 3.0V to 3.6V (Notes 2, 3) TA = +25°C, RSET = 60kΩ, VCC = 4.5V to 5.5V (Notes 2, 3) VCC = 3.3V (Notes 2, 3, 4) Peak-to-Peak Dither (3σ) (Note 5) Power-Up Time Load Capacitance Output Duty Cycle Output Rise/Fall Time tPOR + tSTAB CL tR, tF J0 = GND, J1 = GND J0 = VCC, J1 = GND J0 = GND, J1 = VCC J0 = VCC, J1 = VCC (Note 6) (Note 7) 4MHz to 8MHz, TA = +25°C (Note 3) <4MHz (Note 4) CL = 15pF MIN TYP MAX UNITS 4.0 8.0 MHz -3.0 +3.0 % -0.5 -1.25 +0.5 +1.25 % -2.0 +2.0 % 0 2% 4 8 0.1 0.5 ms 30 pF 45 55 50 % 20 ns Note 1: All voltages referenced to ground. Note 2: This is the change observed in output frequency due to changes in temperature or voltage. Note 3: See the Typical Operating Characteristics section. Note 4: Parameter is g.


MMA6270Q DS1090 ADIS16255


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)