AD9789BBCZRL

Digital To Analog Converters Overview

The AD9789BBCZRL 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 using CMOS or LVDS standards. Operating from 1.5 V, 1.8 V, and 3.3 V supplies, it consumes approximately 1.6 W at full speed. It is housed in a 164-ball CSP-BGA package.

Digital To Analog Converters Feature Summary

• Integrated four-channel datapath with 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 digital interface accepts real or complex data via CMOS or LVDS modes at rates up to 150 MHz.
• Built-in self-test (BIST) capabilities including input connectivity checks and internal random number generation.

Digital To Analog Converters Applications

• Broadband communications systems
• CMTS and DVB-C infrastructure
• Cellular base station infrastructure
• Point-to-point wireless links

Digital To Analog Converters Procurement Notes

Verify the Rev B datasheet specifications against the specific manufacturing lot requirements. Confirm that the 164-ball CSP-BGA package thermal characteristics align with the target PCB layout design. Ensure supply voltages match the required 1.5 V, 1.8 V, and 3.3 V rails for proper operation.

Digital To Analog Converters Selection Notes

Select this component when high integration of signal processing is required alongside high-speed conversion. The AD9789 is suitable for applications needing direct synthesis of multiple contiguous channels without external digital upconverters. Consider the power dissipation of 1.6 W and the need for adequate thermal management on the PCB.

Digital To Analog Converters Part Context

This part belongs to the Analog Devices AD9789 family of high-performance RF DACs. The BBCZRL suffix indicates the specific pinout, temperature range, and reel packaging format. It is designed to replace discrete solutions involving separate DACs and digital signal processors in multi-channel transmitter architectures.

Digital To Analog Converters Replacement Considerations

Direct replacement requires verifying compatibility with existing FPGA logic and clocking schemes. Alternative parts may lack the integrated QAM and interpolation features, necessitating additional digital processing resources on the host system.

Digital To Analog Converters FAQ

What is the maximum adjusted DAC update rate?

The adjusted DAC update rate is calculated as fDAC divided by the minimum interpolation factor. For the AD9789, with a minimum interpolation factor of 16 and fDAC of 2400 MSPS, the adjusted rate is 150 MSPS.

Does the AD9789 support both real and complex data inputs?

Yes, the flexible digital interface can be configured to accept either real or complex data through its 4, 8, 16, or 32-bit wide bus options.

How is the internal reference voltage managed?

The device includes an internal bandgap voltage reference of 1.2 V. The VREF pin provides access to this reference, which has an output impedance of approximately 5 kΩ and should be decoupled to analog ground.