The AD9859 is a direct digital synthesizer (DDS) featuring a 10-bit DAC operating at up to 400 MSPS. It has a 400 MSPS internal clock speed, integrated 10-bit DAC, 32-bit tuning word, phase noise ≤ -120 dBc/Hz @ 1 kHz offset (DAC output), excellent dynamic performance >75 dB SFDR @ 160 MHz (±100 kHz offset), 1.8 V power supply, support for software and hardware controlled power-down, support for 5 V input levels on most digital inputs, PLL REFCLK multiplier (4× to 20×), internal oscillator drivable by a single crystal, phase modulation capability, multichip synchronization, and more. It is suitable for applications such as agile LO frequency synthesis, programmable clock generators, test and measurement equipment, commercial and amateur radio exciter, etc.
The AD9859 DDS provides a 400 MSPS internal clock and a 10‑bit DAC, delivering high‑performance frequency‑agile analog output up to 200 MHz. It supports serial I/O control, multichip synchronization, and a programmable phase‑modulation capability, making it suitable for agile LO synthesis, programmable clock generators, and test equipment.
The device operates from a 1.8 V supply, offers a wide temperature range of –40 °C to +105 °C, and is supplied in a 48‑lead thin‑quad flat package with an exposed pad. Detailed electrical specifications, pin functions, and typical performance graphs are provided for design integration.
| Maximum internal clock speed | 400 MSPS |
|---|---|
| DAC resolution | 10 bits |
| Serial control bus maximum frequency | 25 Mbps |
| Single‑tone mode power consumption | 162 mW |
| Package type | 48‑Lead Thin Quad Flat Package, Exposed Pad (TQFP_EP) |
The serial control bus can operate up to 25 Mbps.
The DAC provides a 10‑bit resolution.
Both AVDD and DVDD are 1.8 V ±5 %.