The AD9857 from Analog Devices Inc. is a highly integrated digital upconverter that has been designed to provide a flexible solution for communication systems where high performance is paramount. It combines a high-speed, direct digital synthesizer (DDS), a high-performance digital-to-analog converter (DAC), and additional signal processing functions on a single chip, making it an ideal choice for applications such as wireless base stations, cable modem termination systems, and broadband access systems.

Key Features

• High-Speed DDS: The AD9857 incorporates a high-speed DDS with a 48-bit frequency tuning word, allowing for fine frequency resolution.
• 14-Bit DAC: With its integrated 14-bit DAC, the AD9857 is capable of converting the synthesized high-frequency signals into an analog output with high precision.
• Programmable Clock Multiplier: The device includes a programmable clock multiplier that supports various input clock frequencies, enabling it to be used in a wide range of system clock configurations.
• Flexible Output Modes: The AD9857 offers both single-ended and differential output modes to match the requirements of different system designs.
• Integrated RAM: On-chip RAM allows for complex modulation schemes through programmable symbol mapping, enhancing the modulation capabilities of the device.

Performance Characteristics

The AD9857 is designed to deliver superior spectral performance and high output dynamic range. The device operates with a 400 MSPS internal clock speed, which results in a high data throughput and supports a wide output bandwidth. This makes the AD9857 an excellent choice for applications requiring high data rates and advanced modulation techniques.

Applications

With its advanced features and high level of integration, the AD9857 is well-suited for a variety of applications, including:

• Wireless base station transceivers
• Cable modem termination systems
• Broadband access systems
• Point-to-point communication links
• Instrumentation and test equipment

Overall, the AD9857 is a versatile and powerful component for any system designer looking to implement a high-quality digital upconversion scheme in their communication products.