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 DS1090 is a low‑cost, dithered oscillator designed for external clock use in switched‑mode power supplies and other low‑frequency applications. Its spread‑spectrum operation reduces peak‑radiated emissions by sweeping the output frequency.
The device features a resistor‑programmed master oscillator, a factory‑programmed prescaler, and a pin‑programmed dither circuit. Output frequency, dither rate, and dither percentage are set via external resistors and control pins, allowing flexible integration into industrial, automotive, and server applications.
| Output Frequency Range | 125 kHz to 8 MHz |
|---|---|
| Dither Percentage Range | 0 % to 8 % |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Output Type | CMOS/TTL‑compatible |
| Package | USOP (8‑lead) – tape & reel option |
The DS1090 can generate frequencies from 125 kHz up to 8 MHz.
The device operates with a supply voltage between 3.0 V and 5.5 V.
The device is rated for temperatures from –40 °C to +85 °C.