The AD9959 Rev. B is a 4-Channel, 500 MSPS DDS with 10-Bit DACs
The AD9959 DDS integrates four independent synthesizer cores, each with separate frequency, phase, and amplitude control. All channels share a common system clock, providing inherent synchronization and allowing multi‑device operation. The device includes four high‑speed 10‑bit DACs, programmable reference‑current settings, and a flexible SPI‑compatible serial I/O port.
The datasheet details electrical specifications, pin configurations, timing characteristics, and recommended application circuits. It also covers power‑down modes, linear sweep operation, and modulation capabilities such as FSK, PSK, and ASK, making the AD9959 suitable for radar, instrumentation, and agile local‑oscillator applications.
| Core supply voltage (AVDD, DVDD) | 1.8 V ±5 % |
|---|---|
| Digital I/O supply voltage (DVDD_I/O) | 3.3 V ±5 % |
| Maximum REFCLK frequency (multiplier bypassed) | 500 MHz |
| REFCLK multiplier range | 4 × to 20 × |
| DAC resolution | 10 bits |
| Operating temperature range | ‑40 °C to +85 °C |
| Maximum total power dissipation (single‑tone mode, all channels on) | 540 mW (typical) |
| Channel‑to‑channel isolation | > 65 dB |
The AD9959 contains four independent DDS channels.
Each integrated DAC has a 10‑bit resolution.
The digital I/O pins operate from a 3.3 V supply (DVDD_I/O).
The device is rated for temperatures from –40 °C up to +85 °C.