AD9985KSTZ-140

Specialized Overview

The AD9985KSTZ-140 is an 8-bit, 140 MSPS analog interface IC designed for capturing RGB graphics signals. It features a triple ADC with a 300 MHz full-power analog bandwidth and supports resolutions up to SXGA (1280 × 1024 at 75 Hz). The device operates on a single 3.3 V supply, drawing typical currents of 180 mA (VD) and 26 mA (VDD), resulting in approximately 760 mW power dissipation. It includes an internal PLL generating pixel clocks from 12 MHz to 140 MHz, with typical jitter of 700 ps p-p. Digital outputs are CMOS-compatible, functioning between 2.5 V and 3.3 V. The component is housed in an 80-lead LQFP package and specified over the –40°C to +85°C temperature range.

Specialized Feature Summary

• Integrated 140 MHz triple ADC with programmable gain, offset, and clamp control for accurate signal digitization.
• On-chip PLL generates pixel clock from Hsync input, maintaining phase alignment across data and sync outputs.
• Full sync processing capabilities including composite sync detection and Sync-on-Green slicing for versatile signal handling.
• Fully programmable via a 2-wire serial interface for automated clamping level adjustment and power management.

Specialized Applications

• RGB graphics processing systems
• LCD monitors and projectors
• Plasma display panels
• Scan converters
• Digital TV

Specialized Procurement Notes

Verify the specific suffix '140' confirms the maximum conversion rate specification against the official datasheet. Confirm the LQFP-80 package outline dimensions match the target PCB footprint. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS process. Validate that the 3.3 V supply requirements align with the system design constraints.

Specialized Selection Notes

Select this model when an 8-bit resolution is sufficient for the application, as opposed to the 10-bit AD9984 series. Verify that the 140 MSPS maximum conversion rate meets the highest required pixel clock frequency. Consider the 300 MHz analog bandwidth for high-frequency signal integrity. Ensure the operating temperature range of –40°C to +85°C covers the environmental conditions.

Specialized Part Context

The AD9985 belongs to Analog Devices' family of analog interface ICs optimized for flat-panel displays. It serves as a bridge between analog RGB sources and digital display processors. Unlike higher-resolution counterparts, it focuses on cost-effective 8-bit performance while maintaining high-speed operation suitable for standard and extended VGA resolutions.

Specialized Replacement Considerations

Public confirmed substitute part numbers: AD9985BSTZ-110 (110 MSPS variant). Note that the suffix indicates speed grade differences; verify functional compatibility if substituting lower-speed variants.