ADV7128KR80 - 80MHz 10-Bit Video DAC | Analog Devices
料号： ADV7128KR80 ✗ 停产ADV7128KR80 概述
A video DAC is a mixed-signal semiconductor that converts parallel digital pixel data into an analog video signal. It belongs to the DAC and digital-to-analog converter hierarchy, which sits within ADC/DAC and broader data-conversion semiconductor categories. The ADV7128 combines a high-speed digital input interface, a 10-bit converter core, and analog current-source outputs in one monolithic device, making it suitable for graphics, broadcast, and digital-video equipment.
The principal features of the ADV7128KR80 are its 80 MHz pipelined operating rate, 10-bit conversion resolution, standard TTL input compatibility, and support for both RS-343A and RS-170 output standards. These characteristics allow the converter to process digital pixel streams at rates commonly encountered in high-resolution color graphics and professional video systems while retaining a straightforward digital interface.
Technically, the device uses CMOS monolithic construction and produces its video signal through a high-impedance analog current source. An external 1.23 V reference establishes the converter reference level, while the pixel clock synchronizes the digital-to-analog conversion process. Because the interface is TTL-compatible and the analog output is current-based, PCB layout should minimize digital-clock noise near the output network and preserve clean reference and analog routing.
Typical applications include high-definition television equipment, high-resolution color graphics systems, broadcast video conversion, digital display interfaces, and multimedia video hardware. The ADV7128 is particularly appropriate where an older RS-343A or RS-170-compatible video output is required but a modern parallel DAC with a single +5 V supply is preferred.
The primary design consideration is external-component and signal-integrity planning. The 1.23 V reference, pixel clock, digital input traces, and analog output network must be routed according to the manufacturer's recommended application circuit. Proper decoupling and controlled impedance are necessary to prevent digital switching activity from degrading video quality.
This product data combines verified manufacturer information, distributor listings, lifecycle observations, and engineering guidance to clarify where the ADV7128KR80 fits. It also distinguishes verified drop-in alternatives from package or suffix changes that cannot safely be assumed as replacements.
直接替换替代料： ADV7128KR80 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
ADV7128KR100
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADV7128KR80 最大额定值与电气特性
| Product Type | 10-bit video digital-to-analog converter |
| Maximum Pipelined Operation | 80 MHz |
| 分辨率 | 10 bit |
| 电源电压 | +5 V |
| Operating Supply Range | 4.75 V to 5.25 V |
| External Reference | 1.23 V |
| Digital Input Interface | 10-bit parallel TTL-compatible pixel input |
| Analog Output | High-impedance current-source output |
| Video Standard Compatibility | RS-343A and RS-170 compatible |
| Process Technology | CMOS monolithic construction |
| 封装 | 28-pin SOIC, 7.50 mm width |
| 安装类型 | Surface mount |
| Maximum Digital Input Rate | 80 MHz |
ADV7128KR80 28-pin soic, 7.50 mm width 引脚配置指南
ADV7128KR80（28-pin soic, 7.50 mm width 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： ADV7128KR80.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADV7128KR80 适用于 6 应用s: High-Definition Television Video Output, High-Resolution Color Graphics, Broadcast and Studio Video Conversion, Legacy Digital Display Interface, Multimedia Video Adapter, Industrial Video Inspection and Monitoring.
High-Definition Television Video Output
The ADV7128KR80 fits legacy HDTV output stages that require a parallel 10-bit pixel bus and conventional analog video. Its 80 MHz maximum pipelined operation accommodates the device's stated video-speed role, while TTL-compatible inputs simplify interfacing with older digital-video logic. The single +5 V supply and external 1.23 V reference support an established mixed-signal architecture. Designers should use the manufacturer's recommended video-output network, terminate the digital bus correctly, and preserve adequate isolation between pixel-clock traces and the sensitive analog output. The 10-bit resolution and RS-343A or RS-170-compatible output make the converter particularly suitable for systems whose video path was designed around conventional component or studio video levels.
推荐
High-Resolution Color Graphics
The ADV7128KR80 can serve as the final digital-to-analog conversion stage in a high-resolution color-graphics system using a legacy parallel pixel architecture. The 10-bit input preserves the native digital color depth better than an 8-bit converter, and the 80 MHz pipelined rate supports high-speed pixel transfer. TTL-compatible inputs reduce the logic-interface burden when driving the device from older CMOS graphics logic. Because the output is a high-impedance current source, the external resistor and termination network directly influence video amplitude and distortion. PCB implementation should route the ten data lines and pixel clock as a controlled-length bus, place the reference close to the device, and keep the analog output path away from high-current clock and supply traces.
推荐
Broadcast and Studio Video Conversion
The ADV7128KR80 is appropriate for broadcast and studio equipment that still uses RS-343A or RS-170-compatible analog video outputs. Its 10-bit converter resolution supports higher-fidelity conversion than legacy 8-bit systems, while the 80 MHz pipelined specification addresses high pixel-clock rates. TTL-compatible inputs allow connection to digital video logic without a complex high-voltage interface. The implementation must account for the difference between consumer and studio video levels through the appropriate output network. Signal-integrity measures include a short analog output path, a clean 1.23 V reference, local supply bypassing, and careful separation from switching circuitry. Legacy timing and output-amplitude checks remain mandatory before production use.
推荐
Legacy Digital Display Interface
The ADV7128KR80 can provide an analog video endpoint for legacy monitors and display controllers that accept a 10-bit parallel pixel stream. Its TTL-compatible input interface supports older controller families, and the +5 V-only power arrangement avoids the multiple rails demanded by some earlier video-output devices. The converter's 80 MHz operation rate should be checked against the controller's maximum pixel clock and total blanking interval. Layout quality directly affects display stability: maintain a consistent pixel-data bus, provide a low-noise reference, and prevent switching-node currents from sharing paths with the analog output. A prototype should be evaluated for color accuracy, edge response, synchronization, and output compliance across the full supported resolution.
推荐
Multimedia Video Adapter
The ADV7128KR80 is usable in a legacy multimedia adapter that must generate conventional analog video from a parallel digital pixel engine. The 10-bit pixel input and 80 MHz pipelined rate suit graphics pipelines that predate serialized display interfaces, while the standard TTL interface eases connection to existing video controllers. The converter's single +5 V supply and external 1.23 V reference make the power architecture straightforward relative to multi-rail legacy designs. Engineering validation should include pixel-clock timing, output settling at the selected pixel rate, and video-level compliance. Short analog traces, local decoupling, and a dedicated reference-return path are important because display artifacts caused by reference or clock coupling can otherwise be mistaken for converter malfunction.
推荐
Industrial Video Inspection and Monitoring
The ADV7128KR80 can support legacy industrial video inspection or monitoring equipment that retains an RS-343A or RS-170 analog-video interface. The 10-bit conversion resolution preserves more gray and color information than an 8-bit implementation, while operation up to 80 MHz provides a suitable rate for conventional pixel-clock domains. TTL-compatible digital inputs allow integration with controller logic already designed around older voltage families. For industrial deployment, validate operating-temperature limits, which are not present in the supplied excerpts, and confirm the continued availability of obsolete inventory. The PCB should provide uninterrupted reference and analog routing, use stable video termination, and separate converter output paths from motor controls, switching supplies, and high-energy machine wiring.
推荐
推荐产品汇总
工程参考数据： ADV7128KR80 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADV7128KR100 |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 28-pin SOIC | 28-pin SOIC |
| Product Type | 10-bit video DAC | 10-bit video DAC |
| Maximum Pipelined Operation | 80 MHz | 100 MHz |
| Resolution | 10 bit | 10 bit |
| Supply Voltage | +5 V | +5 V |
| External Reference | 1.23 V | 1.23 V |
| Digital Input Interface | TTL-compatible 10-bit parallel pixel input | TTL-compatible 10-bit parallel pixel input |
| Output Compatibility | RS-343A and RS-170 compatible | RS-343A and RS-170 compatible |
关键差异点
- Matches the required legacy video-conversion rate （对比 ADV7128KR100)
- Provides the verified 10-bit video conversion resolution （对比 ADV7128KR100)
- Uses the established single-supply video architecture （对比 ADV7128KR100)
设计说明
Route the ten digital pixel inputs and pixel clock as a compact, consistently timed bus. Keep the analog output and reference paths away from clock edges, switching-regulator traces, and high-current return paths. The supplied data verifies an 80 MHz maximum pipelined rate, so timing margins should be evaluated with the actual pixel clock, board delay, and receiving-device setup requirements rather than inferred only from clock frequency.
Use the manufacturer's recommended application circuit for the 1.23 V external reference, supply bypassing, and high-impedance analog current-source output network. Place reference and decoupling components close to their associated pins, provide a low-impedance return path, and avoid sharing narrow analog traces with digital return currents. Verify output compliance and video amplitude in the final schematic because those values were not included in the supplied excerpts.
Do not treat every ADV7128 suffix as an automatic drop-in replacement. The KR80 ordering code includes a speed grade, while other suffixes may indicate package, temperature, or handling differences. Confirm the complete ordering information, pin assignments, clock limit, operating temperature, and electrical characteristics. Also do not assume that a faster 100 MHz member preserves every timing, power, and output characteristic of the original 80 MHz design.
合规信息
The supplied verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The obsolete legacy-product status does not by itself establish non-compliance, so these fields remain unknown.
