AD724JR RGB to NTSC/PAL Video Encoder | Analog Devices
Артикул: AD724JR ✓ АктивенAD724JR Обзор
A video encoder is an interface and signal-conversion integrated circuit that bridges an RGB graphics or video source with a composite-video output stage. The AD724 is therefore positioned within the video interface hierarchy rather than as a general-purpose processor or memory device. In an analog video system, RGB signals carry separate color information, while composite video combines luminance and chrominance into a single signal. This makes the encoder useful in legacy video generation, test equipment, video processing, and educational electronics.
The AD724JR supports both NTSC and PAL standards, giving the design flexibility to address different regional video formats. Its three principal outputs allow a system to use luminance and chrominance separately when additional processing is required, or use the composite output when a single video connection is needed. The 16-lead SOIC package is surface mountable and supports compact, automated assembly. The exact electrical limits, timing values, supply requirements, and detailed operating ranges are defined in the AD724 manufacturer datasheet.
The encoder’s signal architecture makes it important to treat analog video routing as a controlled-impedance and grounding problem. RGB inputs determine color and timing relationships, while luminance and chrominance outputs are intended for downstream amplification, termination, or video-processing stages. Using the correct termination and impedance environment helps preserve signal amplitude and reduce reflections. The manufacturer datasheet specifically recommends connecting analog and digital ground pins to the ground plane through short, low-inductance paths and bypassing each power supply pin with a 0.1 uF capacitor and approximately 10 uF tantalum capacitor.
Typical applications include composite-video signal generation, NTSC and PAL video test fixtures, RGB-to-composite conversion modules, industrial imaging interfaces, video timing demonstrations, and instrumentation that must produce a conventional analog video output. Because the AD724JR is a dedicated encoder, it is most appropriate when the design already contains RGB signals and requires a standardized luminance, chrominance, or composite output.
The principal design consideration is ensuring that the input levels, synchronization requirements, and output termination match the intended video standard. PCB layout should preserve short analog paths, provide stable decoupling, and separate sensitive video routing from noisy switching or high-current paths. Review the manufacturer datasheet pin-description table before assigning tracks, especially when the same board must support both NTSC and PAL configurations.
This product page combines the manufacturer description, package information, search-specific documentation intent, practical bypass and grounding guidance, and a conservative replacement assessment. It distinguishes what the AD724JR is designed to do from broader video-system requirements, helping engineers determine fit before modifying an existing PCB or requesting a quote.
Аналоги без доработки для AD724JR — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
AD724JRZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD724JRZ-RL
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD724JR Максимальные параметры и электрические характеристики
| Product Type | RGB to NTSC/PAL video encoder IC |
| Manufacturer | Analog Devices |
| Input Signals | Red, green, and blue color-component signals |
| Supported Video Standards | NTSC and PAL |
| Luminance Output | Baseband amplitude output |
| Chrominance Output | Subcarrier amplitude and phase output |
| Composite Output | Combined luminance and chrominance output |
| Output Drive Capability | All three outputs can simultaneously drive 75 ohm |
| Корпус | 16-SOIC, 0.295 inch / 7.50 mm width |
| Тип монтажа | Surface mount |
| Количество выводов | 16 pins |
| Power Supply Bypass | 0.1 uF low-inductance capacitor per supply pin |
| Bulk Supply Bypass | Approximately 10 uF tantalum capacitor per supply pin |
| Grounding Requirement | Analog and digital grounds tied to the ground plane by short, low-inductance paths |
Руководство по цоколевке AD724JR в корпусе 16-soic, 0.295 inch / 7.50 mm width
Цоколевка для AD724JR (корпус 16-soic, 0.295 inch / 7.50 mm width). Этот аналоговый компонент имеет выводы входа, выхода и питания. Обратитесь к техническому описанию производителя для конфигураций выводов балансировки нуля, коррекции и разрешения. Идеально подходит для схем обработки сигналов и усилителей.
Нет подробных данных о распиновке для AD724JR.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
AD724JR подходит для 6 применениеs: NTSC Composite-Video Generator, PAL Composite-Video Generator, RGB-to-Composite Video Adapter, Video Test and Measurement Fixture, Industrial Imaging Video Interface, Educational RGB Video Demonstrator.
NTSC Composite-Video Generator
The AD724JR is suitable for generating conventional NTSC composite video from separate red, green, and blue source signals. Its dedicated encoder path converts the RGB inputs into luminance and chrominance representations and provides a combined composite output. Because the manufacturer states that luminance, chrominance, and composite outputs can simultaneously drive 75 ohm loads, the device can support a direct video output while preserving separate signals for monitoring or additional processing. The 16-lead SOIC package also fits automated assembly into compact generator and test-equipment boards.
Рекомендуется
PAL Composite-Video Generator
For PAL video generation, the AD724JR converts red, green, and blue color components into the luminance and chrominance signals required by the PAL standard. A design can use the composite output for a single analog connection while retaining separate luminance and chrominance outputs for synchronization, measurement, or downstream processing. Because the three outputs can drive 75 ohm simultaneously, output routing should be checked for loading, termination, and amplitude compatibility with the target monitor and cable length.
Рекомендуется
RGB-to-Composite Video Adapter
The AD724JR provides the central signal conversion for an RGB-to-composite adapter. An external source supplies red, green, and blue signals, while the encoder creates luminance, chrominance, and composite-video outputs for the downstream connector and termination network. This arrangement is useful for legacy graphics equipment, instructional setups, and industrial panels that expose RGB internally but require conventional analog video externally. Place the decoupling capacitors close to the supply pins and route video outputs away from switching nodes.
Рекомендуется
Video Test and Measurement Fixture
The AD724JR can serve as the RGB encoding element in a video test fixture that produces repeatable NTSC or PAL test signals. Separate luminance and chrominance outputs allow a fixture to expose individual signal parameters for calibration, while the composite output supports end-to-end monitor testing. The manufacturer requirement for short, low-inductance ground paths and 0.1 uF plus approximately 10 uF supply bypass networks is particularly important in a measurement fixture where switching regulators, logic, and analog video circuitry may share the board.
Рекомендуется
Industrial Imaging Video Interface
In an industrial imaging system that retains an RGB baseband video path, the AD724JR can generate the NTSC or PAL analog output expected by legacy displays, recorders, or inspection equipment. Its separate luminance and chrominance outputs provide useful taps for synchronization and diagnostic circuitry, while the composite output supports direct integration with standard video equipment. The design should verify RGB amplitude levels, timing, grounding, and output loading against the intended industrial display before production release.
Рекомендуется
Educational RGB Video Demonstrator
The AD724JR is practical for an educational platform that demonstrates how RGB color information becomes NTSC or PAL composite video. Students can observe the luminance and chrominance outputs separately and compare them with the combined composite signal using an oscilloscope or display. Its 16-lead SOIC package is easy to include on a demonstration board, while the manufacturer's bypass and grounding recommendations provide a clear grounding example for mixed analog and digital layout. Additional filtering or attenuation may be required to match a particular display input.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AD724JR — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | AD724JRZ | AD724JRZ-RL |
|---|---|---|---|
| Package | 16-SOIC, 0.295 inch / 7.50 mm width | 16-SOIC | 16-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Product Type | RGB to NTSC/PAL video encoder IC | RGB to NTSC/PAL video encoder IC | RGB to NTSC/PAL video encoder IC |
| Supported Video Standards | NTSC and PAL | NTSC and PAL | NTSC and PAL |
| Video Outputs | Luminance, chrominance, and composite output | Luminance, chrominance, and composite output | Luminance, chrominance, and composite output |
| Input Signals | Red, green, and blue color-component signals | Red, green, and blue color-component signals | Red, green, and blue color-component signals |
| Output Drive Capability | All three outputs can simultaneously drive 75 ohm | All three outputs can simultaneously drive 75 ohm | All three outputs can simultaneously drive 75 ohm |
| Supply Bypass Recommendation | 0.1 uF low-inductance and approximately 10 uF tantalum capacitor per supply pin | 0.1 uF low-inductance and approximately 10 uF tantalum capacitor per supply pin | 0.1 uF low-inductance and approximately 10 uF tantalum capacitor per supply pin |
Ключевые отличия
- Provides three simultaneously usable analog video outputs (против AD724JRZ)
- Supports NTSC and PAL in one dedicated encoder (против AD724JRZ-RL)
- Surface-mount integration in a 16-lead SOIC package (против AD724JRZ)
Заметки по проектированию
Place a 0.1 uF low-inductance capacitor and an approximately 10 uF tantalum capacitor at each power-supply pin as specified by the manufacturer. Keep the loop area between each capacitor, its supply pin, and the ground return small. This arrangement limits supply transients and high-frequency coupling that could otherwise appear on the luminance, chrominance, or composite video outputs.
Connect both analog and digital ground pins to the ground plane through short, low-inductance paths. Route RGB inputs and analog outputs away from switching nodes, power inductors, and high-current return paths. If both logic and analog circuitry are present, maintain a continuous ground reference under the encoder and avoid forcing video signals across a ground-plane split.
Do not assume that a generic SOIC-16 drawing can replace the AD724JR pin-description table. Confirm every pin assignment, supply connection, RGB input, and video output in the official manufacturer datasheet before fabrication. Also validate input levels, NTSC or PAL timing, output amplitude, and the 75 ohm load arrangement for the specific display or cable system.
Treat the luminance, chrominance, and composite paths as analog video interconnects. Match routing to the intended 75 ohm environment, keep video traces short where practical, and place any required series termination close to the driver. Check all three outputs simultaneously because the manufacturer states that each can drive 75 ohm at the same time.
Информация о соответствии
The manufacturer product page and datasheet excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The video encoder is not presented as an automotive-qualified device.
