Analog Devices Inc. AD9884KS-140

Overview

AD9884KS-140 from Analog Devices is an 8-bit, 140 MSPS monolithic graphics digitizer IC optimized for RGB signal acquisition in PC and workstation video capture systems. It integrates a 500 MHz full-power analog bandwidth ADC, on-chip PLL generating pixel clocks from HSYNC/COAST, internal +1.25 V reference, and programmable gain/offset/clamp control - enabling direct digitization of VGA–SXGA (1280×1024@75Hz) signals with only a +3.3 V supply and minimal external components.

For engineers reviewing the AD9884KS-140 datasheet, AD9884KS-140 pinout, AD9884KS-140 application, or AD9884KS-140 equivalent, key selection criteria include its 140 MSPS sampling rate, dual-channel parallel/interleaved output mode, 500 ps p-p PLL jitter, 2.5–3.3 V CMOS output voltage compatibility, and serial port programmability for real-time clamp/gain/phase adjustment in display interface designs.

Technical Context

The AD9884KS-140 implements three independent 8-bit ADCs (R/G/B) with fully differential analog input paths, each supporting 0.5–1.0 V_p–p range and digitally programmable 6-bit offset and 8-bit gain. Its PLL synthesizes pixel clocks from 30–90 kHz HSYNC inputs, delivering 20–140 MHz outputs with configurable VCO range, charge pump current, and 32-step phase adjustment (11.25°/step).

It supports four operational modes via serial register control: single/dual channel, interleaved/parallel output, 1× or 2× pixels per clock (using CKINV), and internal/external clamp sourcing. All digital outputs are three-state CMOS, independently powered by VDD (2.5–3.3 V), while analog core runs from VD = 3.3 V, consuming 730 mW typical.

Key Specifications

Pinout & Package

Fabricated in an advanced CMOS process and supplied in a 128-lead MQFP (ST-128) surface-mount plastic package, the AD9884KS-140 measures 20 mm × 14 mm with 0.4 mm lead pitch, rated for operation from 0°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar graphics digitizer applications.

Compared with AD9883A-KS-140, the AD9884KS-140 adds COAST functionality and 150 MHz extra analog bandwidth for future-proofing high-resolution capture; versus THS8135IPHP, it trades 2-bit resolution for integrated clock generation and lower system-level BOM count.

Availability

AD9884KS-140 is available at Aetrix Electronics and suitable for RGB graphics capture, LCD monitor interface, plasma display driver, and scan converter applications requiring stable component supply across industrial and commercial production cycles.

Supply support for AD9884KS-140 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD9884KS-140 belongs to Analog Devices' graphics interface product line, designed specifically to simplify high-speed analog video digitization in PC, workstation, and display equipment with integrated timing, conditioning, and programmability.

FAQ

What is the maximum supported display resolution for the AD9884KS-140?

The AD9884KS-140 supports display resolutions up to 1280×1024 at 75 Hz, enabled by its 140 MSPS sampling rate and 500 MHz full-power analog bandwidth. This ensures accurate pixel acquisition across the entire active video period without aliasing or edge degradation, making it suitable for SXGA-class graphics digitization in PC and workstation environments. The AD9884KS-140 achieves this with internal PLL synchronization to HSYNC and precise phase-adjustable sampling.

Does the AD9884KS-140 require an external pixel clock, or can it generate one internally?

The AD9884KS-140 includes an on-chip PLL that generates the pixel clock from HSYNC and COAST inputs, eliminating the need for an external clock source in most applications. Pixel clock frequencies range from 20 MHz to 140 MHz, and the PLL maintains output stability during HSYNC interruptions using the COAST signal. The AD9884KS-140 also supports external clock input via the CKEXT pin when the PLL is disabled through the serial control register.

How does the AD9884KS-140 handle analog input DC restoration for RGB signals?

The AD9884KS-140 provides flexible DC restoration via programmable clamp control: the CLAMP pin accepts an external clamp signal, or the device can generate an internal clamp synchronized to the trailing edge of HSYNC. Clamp placement and duration are adjustable in integer ADC clock periods using two 8-bit serial registers. This ensures precise black-level stabilization across varying RGB source amplitudes - a critical function for consistent color fidelity in the AD9884KS-140's target display applications.

What output configurations does the AD9884KS-140 support for RGB data routing?

The AD9884KS-140 supports both interleaved and parallel output modes across dual-channel (A/B) ports for each RGB channel - yielding six 8-bit buses (DRA0–7/DRA0–7, DGA0–7/DGB0–7, DBA0–7/DBB0–7). Mode selection is controlled via the serial port's Control register (Bit 6). In parallel mode, all 24 bits are available simultaneously per clock; in interleaved mode, data alternates between A and B ports. The AD9884KS-140 also supports 2-pixels-per-clock operation via the CKINV pin for enhanced effective resolution.

Is the AD9884KS-140 compatible with 2.5 V logic interfaces?

Yes, the AD9884KS-140's digital outputs are three-state CMOS buffers powered by VDD, which accepts 2.5 V to 3.3 V - allowing direct interfacing with 2.5 V FPGA, ASIC, or memory controllers without level shifters. Output logic "1" voltage is VD − 0.1 V (min), and logic "0" is 0.1 V (max), meeting standard LVCMOS thresholds. This flexibility simplifies system integration while maintaining signal integrity, and is explicitly specified for the AD9884KS-140 in its switching performance section.