AD9789BBCRL

Digital To Analog Converters Overview

The AD9789 is a 14-bit, 2400 MSPS RF digital-to-analog converter (DAC) featuring integrated four-channel signal processing. It combines QAM encoders with square root raised cosine (SRRC) filters, 16× to 512× interpolation filters, rate converters, and digital upconverters. The device supports flexible data interfaces of 4, 8, 16, or 32 bits with parity, operating at up to 150 MHz in CMOS or LVDS double data rate modes. Power consumption is 1.6 W with an LVDS interface at fDAC = 2.4 GHz. It operates from 1.5 V, 1.8 V, and 3.3 V supplies and is housed in a 164-ball BGA package.

Digital To Analog Converters Feature Summary

• Integrated four-channel QAM mapping, SRRC filtering, and digital upconversion for direct RF synthesis.
• Supports constellation sizes of 16, 32, 64, 128, and 256 with configurable interpolation factors from 16× to 512×.
• Flexible parallel data interface accepts real or complex data via CMOS or LVDS drivers at rates up to 150 MHz DDR.
• Built-in self-test (BIST) capabilities including input connectivity checks and internal random number generation.

Digital To Analog Converters Applications

• DOCSIS 3.0 cable modem termination systems (CMTS)
• DVB-C broadband communication systems
• Cellular infrastructure base stations
• Point-to-point wireless links

Digital To Analog Converters Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and reel specifications. Confirm that the component meets RoHS compliance standards required for the target assembly process. Ensure the design accommodates the 164-ball BGA footprint and thermal requirements specified in the datasheet outline dimensions.

Digital To Analog Converters Selection Notes

Select this component when high linearity and low noise are required for multi-channel RF synthesis up to 1 GHz. The internal rate converter allows operation with a fixed DAC clock while supporting various baud rates. Verify that the host system can provide the necessary 1.5 V, 1.8 V, and 3.3 V power rails and that the interface timing constraints for CMOS or LVDS modes are met.

Digital To Analog Converters Part Context

The AD9789 belongs to the Analog Devices TxDAC family of high-speed digital-to-analog converters. It is designed specifically for applications requiring significant on-chip digital signal processing to reduce the load on upstream field-programmable gate arrays (FPGAs). The device integrates the complete digital front-end chain typically found in modern broadband transmitters.

Digital To Analog Converters Replacement Considerations

Direct pin-compatible replacements are not explicitly documented in the provided source material. Evaluate other Analog Devices high-speed DACs with similar interpolation and QAM features if the AD9789 is unavailable, ensuring voltage levels and interface compatibility match the existing design.

Digital To Analog Converters FAQ

What is the maximum supported interpolation factor?

The AD9789 supports interpolation factors ranging from 16× to 512×.

How does the device handle data interface flexibility?

The digital interface is configurable for bus widths of 4, 8, 16, or 32 bits and supports both CMOS and LVDS signaling modes.

What is the purpose of the built-in self-test (BIST)?

The BIST feature includes an input connectivity check and an internal random number generator to verify the integrity of the QAM output AC performance without external test equipment.