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AD9985A:  110 MSPS/140 MSPS Analog Interface for Flat Panel Displays

Product Details


Newer Alternatives:
  • AD9984A High Performance 10-Bit Display Interface

The AD9985A is a complete 8-bit, 140 MSPS, monolithic analog interface optimized for capturing RGB graphics signals from personal computers and workstations. Its 140 MSPS encode rate capability and full power analog bandwidth of 300 MHz support resolutions up to SXGA (1280 × 1024 at 75 Hz).

The AD9985A includes a 140 MHz triple ADC with internal 1.25 V reference, a PLL, and programmable gain, offset, and clamp control. The user provides only a 3.3 V power supply, analog input, and horizontal sync (Hsync) and Coast signals. Three-state CMOS outputs can be powered from 2.5 V to 3.3 V.

The AD9985A’s on-chip PLL generates a pixel clock from the Hsync input. Pixel clock output frequencies range from 12 MHz to 140 MHz. PLL clock jitter is 500 ps p-p typical at 140 MSPS. When the COAST signal is presented, the PLL maintains its output frequency in the absence of Hsync. A sampling phase adjustment is provided. Data, Hsync, and clock output phase relationships are maintained.

The AD9985 also offers full sync processing for composite sync and sync-on-green applications, variable analog input bandwidth control, variable SOGIN bandwidth control and selectable input filtering.

A clamp signal is generated internally or can be provided by the user through the CLAMP input pin. This interface is fully programmable via a 2-wire serial interface.

Fabricated in an advanced CMOS process, the AD9985A is provided in a space-saving 80-lead LQFP surface-mount Pb-free plastic package, and is specified over the –40°C to +85°C temperature range.

Applications

  • RGB graphics processing
  • LCD monitors and projectors
  • Plasma display panels
  • Scan converters
  • Microdisplays
  • Digital TVs

FEATURES and BENEFITS

  • Automated clamping level adjustment
  • 140 MSPS maximum conversion rate
  • 300 MHz analog bandwidth
  • 0.5 V to 1.0 V analog input range
  • 500 ps p-p PLL clock jitter at 110 MSPS
  • 3.3 V power supply
  • Full sync processing
  • Sync detect for hot plugging
  • Midscale clamping
  • Power-down mode
  • Low power: 500 mW typical
  • 4:2:2 output format mode

Functional Block Diagram for AD9985A

AdvantivAdditional product choices for Advanced TV applications are available on the Advantiv® site.

Documentation

Title Content Type File Type
AD9985A: 110 MSPS/140 MSPS Analog Interface for Flat Panel Displays Data Sheet (Rev 0, 08/2005) (pdf, 622 kB) Data Sheets PDF
Analysis of Common Failures of HDMI CT
By Brett Li and Lie Dou, ATV Product Line, Analog Devices
(Digital TV DesignLine, 4/2/2008)
Technical Articles HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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Price, packaging, availability

AD9985A Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9985ABSTZ-110 Status: Contact ADI 80 ld LQFP (14x14mm) 80 Ind Tray, 90 $8.50 $7.23 Y  Material Info PCN Purchase
AD9985AKSTZ-110 Status: Contact ADI 80 ld LQFP (14x14mm) 80 Comm. Tray, 90 $4.25 $3.62 Y  Material Info PCN Purchase
AD9985AKSTZ-140 Status: Contact ADI 80 ld LQFP (14x14mm) 80 Comm. Tray, 90 $5.46 $4.66 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD9985A Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9985A/PCBZ Status: Obsolete Evaluation Board - Yes - Contact ADI

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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