AD9858 Datasheet | Analog Devices

FEATURES 1 GSPS internal clock speed Up to 2 GHz input clock (selectable divide-by-2) Integrated 10-bit DAC Excellent phase noise and SFDR 32-bit programmable frequency register Simplified 8-bit parallel and SPI serial control interface Automatic frequency sweeping capability 4 frequency profiles 3.3 V power supply Power dissipation: 2 W typical Integrated programmable charge pump and phase frequency detector with fast lock circuit Isolated charge pump supply up to 5 V Integrated 2 GHz mixer APPLICATIONS VHF/UHF LO synthesis Tuners Instrumentation Agile clock synthesis Cellular base station hopping synthesizers Radars SONET/SDH clock synthesis GENERAL DESCRIPTION The AD9858 is a direct digital synthesizer (DDS) featuring a 10-bit digital-to-analog converter (DAC) operating up to 1 GSPS. The AD9858 uses advanced DDS technology coupled with an internal high speed, high performance DAC to form a digitally programmable, plete high frequency synthesizer capable of generating a frequency-agile analog output sine wave at up to 400 MHz. The AD9858 is designed to provide fast frequency hopping and fine tuning resolution (32-bit frequency tuning word). The frequency tuning and control words are loaded into the AD9858 via parallel (8-bit) or serial loading formats. The AD9858 contains an integrated charge pump (CP) and phase frequency detector (PFD) for synthesis applications requiring the bination of a high speed DDS along with phase-locked loop (PLL) functions. An analog mixer is also provided on chip for applications requiring the bination of a DDS, PLL, and mixer, such as frequency translation loops and tuners. The AD9858 also features a divide-by-2 on the clock input, allowing the external reference clock to be as high as 2 GHz. The AD9858 is specified to operate over the extended industrial temperature range of - 40°C to +85°C. DIV DIV PD CP CPISET FUNCTIONAL BLOCK DIAGRAM LO LO IF IF RF RF ÷M ÷N CHARGE PUMP PHASE DETECTOR DIGITAL PLL ANALOG MULTIPLIER FREQUENCY...