AD9765AST

Digital To Analog Converters Overview

The AD9765AST is a dual-channel, 12-bit CMOS digital-to-analog converter (DAC) from Analog Devices. It integrates two high-performance TxDAC+ cores, an on-chip 1.2 V voltage reference, and digital interface circuitry within a 48-lead LQFP package. The device supports update rates up to 125 MSPS with excellent dynamic performance, achieving a spurious-free dynamic range (SFDR) of 75 dBc at 5 MHz output. It operates on a single 3.3 V or 5 V supply, consuming 380 mW at full scale. Key specifications include a settling time of 35 ns, differential current outputs with 20 mA nominal full-scale current, and gain matching of 0.1%.

Digital To Analog Converters Feature Summary

• Dual 12-bit DACs with 125 MSPS update rate and 75 dBc SFDR at 5 MHz
• Integrated 1.2 V temperature-compensated bandgap voltage reference
• Flexible dual-port or interleaved data interface for I/Q processing
• Single-resistor or independent external resistor gain control modes

Digital To Analog Converters Applications

• Base station communications
• Digital synthesis systems
• Quadrature modulation applications
• 3D ultrasound imaging equipment

Digital To Analog Converters Procurement Notes

Verify the specific suffix 'AST' against the manufacturer's ordering guide to confirm the industrial temperature range (-40°C to +85°C) and RoHS compliance status. Ensure the package type matches the 48-lead LQFP outline dimensions specified in the datasheet. Confirm availability through authorized distributors as lead times may vary.

Digital To Analog Converters Selection Notes

Select the AD9765AST when 12-bit resolution is required for precise signal generation. Choose this component over the AD9763 (10-bit) or AD9767 (14-bit) based on the specific balance between resolution needs and cost. Ensure the design accommodates the 3.3 V to 5 V single-supply operation and the 380 mW power dissipation profile at 5 V.

Digital To Analog Converters Part Context

The AD9765AST belongs to the AD976x family, which includes the pin-compatible AD9763 and AD9767 models. This family shares the same 48-lead LQFP footprint and functional architecture, differing primarily in resolution (10, 12, and 14 bits respectively). This allows for design flexibility and potential upgrades without altering the PCB layout.

Digital To Analog Converters Replacement Considerations

Pin-compatible alternatives within the same series include the AD9763AST (10-bit) and AD9767AST (14-bit). These parts share identical pinouts and core functionality but offer different resolution capabilities. Verify that the system requirements align with the specific bit depth of the replacement part.