The AD9858 is a direct digital synthesizer (DDS) that generates frequencies up to 1GSPS. It integrates a 10-bit DAC, a 32-bit programmable frequency register, a simplified 8-bit parallel and SPI® serial control interface. The AD9858 also features automatic frequency sweeping capability, making it suitable for frequency synthesis applications such as VHF/UHF LO synthesis, tuners, instrumentation, agile clock synthesis, cellular base station hopping synthesizers, radar, and Sonet/SDH clock synthesis.
The AD9858 direct digital synthesizer (DDS) provides a high‑speed 1 GSPS internal clock and a 10‑bit DAC for generating agile analog sine‑wave outputs up to 400 MHz. It includes an integrated 2 GHz mixer, programmable charge pump, and phase‑frequency detector, enabling combined DDS‑PLL‑mixer solutions for applications such as VHF/UHF LO synthesis, radar, and cellular base‑station hopping.
The datasheet details electrical specifications, pin configurations for the 100‑lead EPAD package, timing characteristics, and ordering information. It also lists recommended evaluation boards and outlines the device’s operating temperature range of –40 °C to +85 °C.
| Internal clock speed | 1 GSPS |
|---|---|
| Maximum input clock frequency | 2 GHz (divide‑by‑2 enabled) |
| DAC resolution | 10 bits |
| Power supply voltage | 3.3 V |
| Typical power dissipation | 2 W |
The AD9858 operates with a 1 GSPS internal clock speed.
It can accept up to a 2 GHz input clock when the divide‑by‑2 option is enabled.
It includes an integrated 10‑bit digital‑to‑analog converter.