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Analog Devices Inc. AD9883AKST-140
- Part No.:
- AD9883AKST-140
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 80-LQFP
- Datasheet:
-
AD9883AKST-140.pdf
- Description:
- IC FLAT PANEL INTERFACE 80-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,850
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Product details
Overview
AD9883AKST-140 from Analog Devices is an 8-bit, 140 MSPS triple analog-to-digital converter optimized for RGB graphics capture in flat-panel display interfaces. It integrates a 300 MHz full-power analog bandwidth, on-chip 1.25 V reference, programmable clamp/gain/offset, and PLL-based pixel clock generation with 500 ps p-p jitter at 140 MSPS. It supports SXGA (1280 × 1024 @ 75 Hz) resolution in LCD monitors and digital projectors.
For engineers reviewing the AD9883AKST-140 datasheet, AD9883AKST-140 pinout, AD9883AKST-140 application, or AD9883AKST-140 equivalent, this page delivers verified technical context, exact pin functions, real-world sync processing behavior, and validated alternative options for flat-panel video interface design.
Technical Context
The AD9883AKST-140 implements three independent 8-bit ADC channels with fully synchronized sampling, internal midscale clamping, and hot-plug–capable sync detection. Its PLL derives pixel clock from HSYNC input (12–140 MHz range), maintains frequency during COAST assertion, and supports phase adjustment to align DATACK, HSOUT, and data outputs.
Sync processing includes composite sync separation, sync-on-green (SOGIN) slicing with programmable 10 mV-step threshold (10–330 mV), and configurable polarity/duration for HSOUT/VSOUT. All digital I/O operates at 3.3 V CMOS levels with 5 V tolerance, and output power supply (VDD) is independently routed to minimize noise coupling into analog sections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Conversion Rate | 140 MSPS - enables SXGA@75 Hz digitization without undersampling |
| Analog Bandwidth | 300 MHz full-power - preserves sharp edges and high-frequency pixel transitions |
| PLL Clock Jitter | 500 ps p-p at 140 MSPS - ensures stable sampling timing for low visual artifacts |
| Analog Input Range | 0.5 V to 1.0 V p-p - matches standard RGB signal amplitudes from PC graphics sources |
| Reference Voltage | 1.25 V ±4% - internal bandgap reference with ±50 ppm/°C tempco, bypassed at REF BYPASS pin |
| Power Dissipation | 650 mW typical - supports industrial thermal design with θJA = 35°C/W |
| Operating Temp | 0°C to +70°C - specified for commercial-grade flat-panel monitor applications |
| Digital Output Voltage | VOH = VD – 0.1 V, VOL = 0.1 V - compatible with 2.5 V to 3.3 V logic interfaces |
Pinout & Package
AD9883AKST-140 is housed in an 80-lead LQFP (ST-80) package with exposed pad, designed for surface-mount assembly and thermal management in space-constrained display interface PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RAIN, GAIN, BAIN | Analog Inputs (R/G/B) | High-Z, 0.5–1.0 V p-p inputs; require AC coupling and external 47 nF clamping capacitors |
| RED[7:0], GREEN[7:0], BLUE[7:0] | Digital Outputs | 3.3 V CMOS tri-state outputs; MSB-aligned, fixed delay from sampling edge |
| DATACK | Data Clock Output | Phase-aligned pixel clock output; synchronous with internal sampling, shifts with PHASE register |
| HSOUT, VSOUT, SOGOUT | Reconstructed Sync Outputs | Programmable polarity/duration; HSOUT/VSOUT phase-aligned to DATACK for deterministic timing |
| HSYNC, VSYNC, SOGIN, CLAMP, COAST | Control Inputs | 3.3 V CMOS with Schmitt trigger (HSYNC); SOGIN has internal comparator; CLAMP/COAST enable timing holdover |
| SDA, SCL, A0 | 2-Wire Serial Interface | I²C-compatible control port (max 100 kHz); A0 sets device address for multi-device bus |
| VD, VDD, PVD, GND | Power Supplies | VD = analog core (3.3 V); VDD = digital outputs (2.5–3.3 V); PVD = PLL-only supply; separate ground returns |
| REF BYPASS, MIDSCV, FILT | Analog Reference/Filter Nodes | REF BYPASS requires 0.1 µF to GND; MIDSCV supplies midscale clamp reference; FILT connects external PLL loop filter |
Key Features
| Feature | Design Value |
|---|---|
| Triple 8-bit ADC with shared PLL | Enables simultaneous RGB digitization at up to 140 MSPS with matched gain/offset calibration |
| Hot-plug–capable sync detection | Automatically detects and locks to HSYNC upon source connection-no manual reinitialization required |
| Programmable clamp timing | Internal generator or external CLAMP pin control; supports back-porch clamping for embedded sync signals |
| Sync-on-green (SOG) processing | SOGIN comparator with 10 mV-step adjustable threshold (10–330 mV) and unprocessed HSYNC passthrough mode |
| Independent channel gain/offset | Three 8-bit gain and three 7-bit offset registers allow per-channel brightness/contrast tuning for color fidelity |
| Low-power operation | 500 mW typical dissipation and 5 mA power-down current support thermally constrained monitor designs |
Applications
| RGB Graphics Capture | Scan Converter Front End |
|---|---|
Use Scenario: Digitizing analog VGA output from desktop PCs or workstations for HDMI or LVDS conversion in modern displays. IC Role / Device Role / Timing Role: Primary analog interface IC performing synchronized triple-channel sampling, pixel clock synthesis, and sync reconstruction. Use Value: Eliminates need for discrete ADCs, PLLs, and sync separators-reducing BOM count and layout complexity while maintaining 140 MSPS timing integrity. |
Use Scenario: Converting legacy NTSC/PAL or VGA signals to digital formats for broadcast or archival systems requiring format scaling and frame-rate conversion. IC Role / Device Role / Timing Role: High-fidelity front-end digitizer with precise clamping and programmable gain to preserve luma/chroma fidelity across diverse input sources. Use Value: 300 MHz analog bandwidth and <2 ns transient response ensure minimal edge distortion during rapid pixel transitions in interlaced and progressive sources. |
| LCD Monitor Interface | Digital Projector Input Stage |
Use Scenario: Serving as the analog video receiver in commercial LCD monitors accepting DVI-I or VGA inputs. IC Role / Device Role / Timing Role: System-level analog interface handling RGB digitization, sync extraction, and timing alignment for downstream FPGA or display controller. Use Value: Integrated 1.25 V reference and midscale clamping (via MIDSCV) simplify power and biasing design-no external precision references needed. |
Use Scenario: Capturing high-resolution computer graphics for projection in conference rooms or digital signage with SXGA+ support. IC Role / Device Role / Timing Role: Pixel-clock–locked ADC subsystem ensuring zero-frame-drop capture and deterministic data-to-clock skew (<2 ns). Use Value: 500 ps p-p PLL jitter at 140 MSPS prevents visible horizontal banding or shimmer in static high-contrast content. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog video interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9884AKSTZ-140 | 10-bit resolution, same 140 MSPS rate, extended –40°C to +85°C temp range, lead-free | Required for industrial or automotive display systems needing higher dynamic range and wider temperature operation | Select when >8-bit grayscale depth or extended temperature compliance is mandatory; not drop-in due to different register map and power sequencing |
| THS8200IPHP | Triple 10-bit ADC, 165 MSPS max, integrated sync separator, no on-chip PLL, 3.3 V only | Used where external clock source exists and sync separation is preferred over PLL-based clock recovery | Choose when system already provides stable pixel clock and requires lower jitter than PLL-based solutions; requires external clock routing and separate sync processing logic |
Compared with AD9883AKST-140, AD9884AKSTZ-140 offers higher resolution and industrial temperature rating but demands revised firmware and layout for its distinct power-up sequence; THS8200IPHP eliminates PLL jitter concerns but shifts clock management responsibility to the system designer and lacks COAST functionality for intermittent sync sources.
Availability
AD9883AKST-140 is available at Aetrix Electronics and suitable for LCD monitor manufacturing, digital projector integration, and scan converter development requiring stable component supply and long-term production continuity.
Supply support for AD9883AKST-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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and signal conditioning.
The AD9883A product line was engineered specifically for cost-sensitive, high-volume flat-panel display interfaces-delivering integrated RGB digitization, sync processing, and clock generation in a single 80-lead LQFP package.
FAQ
What is the maximum pixel clock frequency supported by the AD9883AKST-140?
The AD9883AKST-140 supports a maximum PLL clock rate of 140 MHz, enabling digitization of video signals up to SXGA (1280 × 1024) at 75 Hz. This 140 MHz limit is specified under full operating conditions and corresponds directly to its 140 MSPS maximum conversion rate. The PLL remains stable across the 12–140 MHz range, with jitter measured at 500 ps p-p at the 140 MSPS endpoint.
Does the AD9883AKST-140 support sync-on-green (SOG) input processing?
Yes, the AD9883AKST-140 supports SOG via the SOGIN pin, which connects to an internal high-speed comparator with a programmable threshold (10–330 mV in 10 mV steps). When enabled, SOGOUT delivers either the sliced SOG signal or a delayed version of HSYNC. The default threshold is 150 mV, and configuration is performed through the 2-wire serial interface-no external components are required for basic SOG operation.
Can the AD9883AKST-140 operate with a 2.5 V digital output supply (VDD)?
Yes, the AD9883AKST-140 allows VDD to be set between 2.5 V and 3.3 V to interface with lower-voltage logic families. VOH is specified as VD – 0.1 V and VOL as 0.1 V, ensuring valid logic levels across this range. However, VD (analog core) and PVD (PLL supply) must remain at 3.3 V ±10%; only VDD is voltage-scalable for output compatibility.
How does the AD9883AKST-140 handle missing or unstable HSYNC signals?
The AD9883AKST-140 uses the COAST input to maintain pixel clock frequency and phase during HSYNC interruptions. When COAST is asserted, the PLL continues running at its last locked frequency-critical for video sources that blank HSYNC during vertical intervals. COAST polarity is programmable via register 0FH, Bit 3, and the pin may be grounded (default) or pulled high depending on source behavior.
What is the purpose of the MIDSCV pin on the AD9883AKST-140?
The MIDSCV pin provides the internal midscale reference voltage (approximately 0.625 V at mid-gain) used for YUV or midscale-clamped RGB signals. It must be bypassed to ground with a 0.1 µF capacitor regardless of whether midscale clamping is active. Clamping mode is selected per channel via bits 0–2 in register 10H, allowing independent ground- or midscale-referenced digitization for R/G/B inputs.
AD9883AKST-140 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 80-LQFP
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Displays, Monitors, TV
- Interface:
- Analog
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 80-LQFP (14x14)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
AD9883AKST-140 FAQ
1.How can I place an order for AD9883AKST-140 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9883AKST-140 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD9883AKST-140 reliable?
The price and inventory of AD9883AKST-140 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9883AKST-140 is usually 5 days.
3.What payment methods are accepted for AD9883AKST-140?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9883AKST-140 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9883AKST-140?
AD9883AKST-140 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9883AKST-140 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD9883AKST-140?
For technical support, including AD9883AKST-140 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9883AKST-140 requirements.
6.How does Aetrix verify that AD9883AKST-140 is sourced from the original manufacturer or authorized distributors?
All AD9883AKST-140 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD9883AKST-140 meets industry standards.
7.What is the process for return or replacement of AD9883AKST-140?
All AD9883AKST-140 units undergo pre-shipment inspection (PSI). If there is an issue with AD9883AKST-140, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD9883AKST-140 part is unused and in its original packaging.
Return procedure for AD9883AKST-140:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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