The AD9858 is a high performance, 1GSPS direct digital synthesizer.
The AD9858 is a direct digital synthesizer (DDS) featuring a 10‑bit digital‑to‑analog converter (DAC) operating up to 1 GSPS. It provides fast frequency hopping, a 32‑bit programmable frequency register, and an integrated 2 GHz mixer for agile clock synthesis and VHF/UHF LO generation. The device supports both parallel (8‑bit) and serial (SPI) programming interfaces and includes an internal charge pump and phase‑frequency detector for PLL functions.
Key specifications include a 3.3 V supply (typical), power dissipation of about 2 W, and an operating temperature range of –40 °C to +85 °C. The part is offered in a 100‑lead thin‑quad flat package with an exposed thermal pad and is RoHS compliant. Applications span cellular base‑station hopping synthesizers, radars, SONET/SDH clock synthesis, and instrumentation.
| Internal clock speed | 1 GSPS |
|---|---|
| Input clock frequency range | Up to 2 GHz (selectable divide‑by‑2) |
| DAC resolution | 10 bits |
| Power dissipation (typical) | 2 W |
| Operating temperature range | –40 °C to +85 °C |
| Maximum junction temperature | 150 °C |
The AD9858 can accept an input clock of up to 2 GHz when the divide‑by‑2 option is selected.
Typical power dissipation is about 2 W under full‑load conditions.
It is supplied in a 100‑lead thin‑quad flat package with an exposed thermal pad (TQFP_EP).