ADV7122KP80

Digital To Analog Converters Overview

The ADV7122KP80 is a monolithic CMOS digital-to-analog converter featuring three independent 10-bit video DACs for Red, Green, and Blue channels. Operating at a maximum clock rate of 80 MHz, it accepts TTL-compatible parallel pixel data and generates high-impedance analog current outputs. The device integrates composite SYNC and BLANK control inputs to encode synchronization signals directly onto the RGB outputs. It requires a single +5 V supply and an external 1.23 V reference voltage. Packaged in a 44-pin PLCC, it supports RS-343A/RS-170 compatible video standards.

Digital To Analog Converters Feature Summary

• Triple 10-bit DAC architecture with 80 MHz pipelined operation
• Integrated composite SYNC and BLANK control inputs
• TTL-compatible digital inputs and +5 V CMOS construction
• High-impedance current outputs capable of driving doubly terminated 75 Ω loads

Digital To Analog Converters Applications

• High Definition Television (HDTV) systems
• High resolution color graphics displays
• CAE/CAD/CAM applications
• Video signal reconstruction
• Direct Digital Synthesis (DDS) and I/Q modulation

Digital To Analog Converters Procurement Notes

Verify the specific speed grade suffix (e.g., KP80 for 80 MHz) against system timing requirements. Confirm package compatibility with the 44-pin PLCC footprint. Ensure the design includes the required external 1.23 V reference and compensation capacitor as specified in the datasheet. Check for availability of industrial temperature range variants if operating conditions exceed the standard 0°C to +70°C range.

Digital To Analog Converters Selection Notes

Select the ADV7122 over the ADV7121 when composite SYNC and BLANK encoding on the green channel is required. Choose the appropriate speed grade (80 MHz, 50 MHz, or 30 MHz) based on the maximum pixel clock frequency of the target video resolution and refresh rate. Ensure the PCB layout provides separate analog and digital ground planes to maintain signal integrity.

Digital To Analog Converters Part Context

The ADV7122 is part of the ADV7121/ADV7122 family of video DACs from Analog Devices. While the ADV7121 offers identical conversion performance, it lacks the SYNC and BLANK control pins found on the ADV7122. Both devices share the same core 10-bit triple DAC architecture and are designed for high-speed video applications requiring low power dissipation and monotonicity.

Digital To Analog Converters Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for potential newer generation replacements or contact representatives for special request speed grades up to 140 MHz.