ADV7128KR80

ADCs/DACs - Special Purpose Overview

The ADV7128KR80 is a monolithic CMOS 80 MHz, 10-bit video digital-to-analog converter (DAC) manufactured by Analog Devices. It features a high-speed pipelined architecture with TTL-compatible digital inputs and a high-impedance analog current output. The device operates from a single +5 V supply and requires an external 1.23 V reference voltage. Key static performance metrics include ±1 LSB integral nonlinearity (INL) and differential nonlinearity (DNL), ensuring monotonic operation. The maximum clock rate is 80 MHz, with typical power dissipation of 400 mW at this speed. It is housed in a 28-lead small outline IC (SOIC) package.

ADCs/DACs - Special Purpose Feature Summary

• 80 MHz pipelined operation for high-speed video refresh rates
• 10-bit resolution with guaranteed monotonicity (±1 LSB INL/DNL)
• TTL-compatible digital inputs and RS-343A/RS-170 compatible outputs
• Single +5 V CMOS construction with low power dissipation

ADCs/DACs - Special Purpose Applications

• High Definition Television (HDTV)
• High Resolution Color Graphics Systems
• Direct Digital Synthesis (DDS) & I/O Modulation
• Wireless LAN and Wireless Local Loop
• Video Signal Reconstruction and Instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific speed grade suffix when ordering; the KR80 designation indicates the 80 MHz version. Confirm that the application circuit includes the required external 1.23 V reference and RSET resistor to set full-scale output current. Ensure PCB layout adheres to the recommended analog/digital ground plane separation and decoupling guidelines to maintain signal integrity at high frequencies.

ADCs/DACs - Special Purpose Selection Notes

Select the ADV7128KR80 when an 80 MHz pixel clock rate is required for high-resolution graphics or HDTV applications. For lower bandwidth needs, consider the 50 MHz (KR50) or 30 MHz (KR30) variants which offer reduced power consumption. The device requires an external voltage reference (e.g., AD589) and careful attention to output termination (doubly terminated 75 Ω) for standard video compliance.

ADCs/DACs - Special Purpose Part Context

The ADV7128 series belongs to Analog Devices' line of video speed DACs designed for direct digital synthesis and video reconstruction. It integrates a 10-bit DAC, reference amplifier, and TTL input interface on a single chip. The KR80 variant represents the highest speed grade in the family, optimized for demanding real-time video processing tasks requiring fast data throughput and precise grayscale reproduction.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.