The document is the product manual of AD9859, a 400 MSPS, 10-Bit, 1.8 V CMOS Direct Digital Synthesizer.
The AD9859 Direct Digital Synthesizer provides a high‑speed 400 MSPS internal clock and a 10‑bit DAC for agile frequency synthesis up to 200 MHz. It supports serial I/O programming, phase modulation, multichip synchronization and a wide range of power‑down modes.
The device operates from a 1.8 V supply, tolerates an industrial temperature range of –40 °C to +105 °C, and is offered in a 48‑lead TQFP/EP package. Detailed electrical specifications, pin descriptions, performance graphs and suggested application circuits are included.
| Maximum internal clock speed | 400 MSPS |
|---|---|
| DAC resolution | 10 bits |
| Supply voltage (AVDD, DVDD) | 1.8 V ±5% |
| Operating temperature range | -40 °C to +105 °C |
| Maximum junction temperature | 150 °C |
| Serial control bus maximum frequency | 25 Mbps |
| Full‑scale DAC output current (25 °C) | 5‑15 mA |
| Package type | 48‑Lead TQFP/EP |
The AD9859 can run at up to 400 MSPS internal clock speed.
The frequency tuning and control words are loaded into the AD9859 via a serial I/O port.
It requires a 1.8 V supply for AVDD and DVDD, with a ±5 % tolerance.
The device operates from –40 °C to +105 °C.