Product Details

The AD9911 consists of one complete direct digital synthesizer (DDS) that operates up to 500MSPS. In addition, there also exist three auxiliary DDS cores without assigned DACs. These auxiliary channels may be used for either spur reduction or test tone modulation.

The AD9911 serial I/O port offers multiple configurations to provide significant flexibility. The serial I/O port offers an SPIcompatible mode of operation that is virtually identical to the SPI operation found in earlier Analog Devices DDS products. Flexibility is provided by four data pins (SDIO_0:3) that allow four programmable modes of serial I/O operation. The DAC output is supply referenced and must be terminated into AVDD by a resistor or an AVDD center-tapped transformer. The DAC has its own programmable reference to enable different full-scale currents.

The AD9911 comes in a space-saving 56-lead LFCSP package. The DDS core (AVDD and DVDD pins) is powered by a 1.8 V supply. The digital I/O interface (SPI) operates at 3.3 V and requires the pin labeled DVDD_I/O (Pin 49) be connected to 3.3 V.

The AD9911 operates over the industrial temperature range of −40°C to +85°C.

Applications

• Agile local oscillator
• Test and measurement equipment
• Commercial and amateur radio exciter
• Radar and sonar
• Test tone generation

FEATURES AND BENEFITS