AD725ARZ-RL - RGB to NTSC/PAL Video Encoder | Analog Devices
MPN： AD725ARZ-RL ✓ 啟用中AD725ARZ-RL 概覽
A video encoder is a mixed-signal device in the data conversion and video interface hierarchy that transforms parallel or analog component video (RGB or YUV) into a single composite baseband video signal, or into separate luminance (Y) and chrominance (C) signals for S-Video. Encoders sit between a graphics processor or video source and a TV monitor, VCR, or video capture input, performing the color-space conversion, subcarrier modulation, and sync generation required by broadcast television standards.
Key features of the AD725 include both NTSC and PAL composite video outputs and separate chrominance and luminance (S-Video) outputs from the same device, a luminance trap (YTRAP) port that reduces cross-color artifacts generated by subcarrier-frequency components present in the luminance signal, fully TTL-compatible logic levels that support 3 V CMOS logic requirements, and an integrated luminance delay line. This combination allows a single, very low cost device to serve as the complete analog video output stage for embedded systems.
Technically, the AD725 performs RGB-to-YUV matrix conversion, quadrature modulation of the color difference signals onto a subcarrier, and sync insertion, producing standard-amplitude baseband video. For portable or other power-sensitive applications, the device can be powered down to less than 1 uA of current consumption, which is exceptionally low for a video-grade mixed-signal encoder.
Typical applications include embedded graphics boards, set-top box video outputs, industrial display interfaces, legacy TV-out ports on microprocessor systems, and video test equipment where NTSC or PAL composite output is required from an RGB source.
A key design consideration is proper use of the YTRAP pin: connecting the correct external LC trap circuit suppresses subcarrier leakage into the luminance path and materially reduces cross-color shimmer on fine luma detail. Supply decoupling and standard-accuracy crystal reference for the color subcarrier are also important for color accuracy.
This page synthesizes distributor pricing, drop-in alternatives, practical design notes, and application guidance not found in the manufacturer datasheet alone.
直接替換替代品，適用於 AD725ARZ-RL — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD725ARZ-RL （相同外形與佔位） — 差異在於 Luma Trap Port, Package, Packaging.
AD725ARZ
✅ 直接替換聯絡詢價
查看資料表 →AD725AR-RL
✅ 直接替換📋 參考替代品（不在目錄中）
AD725AR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD725ARZ-RL 最大額定值與電氣特性
| 功能 | RGB to NTSC/PAL Video Encoder |
| Video Standards Supported | NTSC and PAL |
| Video Outputs | Composite Video; Chrominance and Luminance (S-Video) |
| Luma Trap Port | Yes (YTRAP, reduces cross-color artifacts) |
| Logic Input Levels | TTL compatible (supports 3 V CMOS systems) |
| Integrated Luma Delay | Yes |
| Power-Down Current | < 1 uA |
| 封裝 | 16-SOIC (0.295 in, 7.50 mm width) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (-RL suffix) |
| Resolution / Color Depth | Analog input (RGB component signals) |
AD725ARZ-RL 16-soic (0.295 in, 7.50 mm width) 腳位配置指南
AD725ARZ-RL（16-soic (0.295 in, 7.50 mm width) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AD725ARZ-RL.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD725ARZ-RL 適用於 6 應用s: Embedded Graphics TV-Out Port, Portable and Battery-Powered Video Devices, Industrial Display and HMI Video Interfaces, Set-Top Box and Consumer Video Auxiliary Output, Video Test and Measurement Equipment, Retro Computing and Legacy System Restoration.
Embedded Graphics TV-Out Port
The AD725ARZ-RL is the classic analog TV-output stage for embedded processors and graphics controllers that provide RGB component video. Its TTL-compatible logic levels accept 3 V CMOS sync and control signals directly, so no level shifting is needed between a 3.3 V microprocessor and the encoder. The device converts the RGB stream into NTSC or PAL composite video at standard baseband amplitude, or into S-Video Y/C pairs for higher-quality connection to TV inputs. The integrated luma delay keeps luminance and chrominance timing aligned, avoiding visible offset between color and detail edges. Because the encoder is very low cost and available in a 16-SOIC surface-mount package, it fits comfortably on cost-sensitive consumer and industrial boards where a single low-cost IC must deliver a standards-compliant composite video signal from a digital system's RGB output.
推薦
Portable and Battery-Powered Video Devices
For portable or other power-sensitive applications, the AD725 can be powered down to less than 1 uA of current consumption per the Analog Devices datasheet, an exceptionally low shutdown figure for a video encoder. In handheld test units, portable media players, and battery-operated inspection cameras that only drive a TV intermittently, the encoder draws essentially nothing when the video stage is disabled, preserving battery life. On wake-up, the device resumes NTSC or PAL encoding of the RGB input with composite and S-Video outputs available immediately. The compact 16-SOIC (7.50 mm width) package keeps board area small, and tape-and-reel (-RL) packaging suits the automated assembly lines used in volume portable-product manufacturing. Designers should budget for the active-mode supply current listed in the datasheet electrical characteristics table when sizing the battery and regulator.
推薦
Industrial Display and HMI Video Interfaces
Industrial human-machine interfaces and legacy control-room displays frequently require composite NTSC or PAL video outputs to feed monitors, video distribution amplifiers, or recording equipment. The AD725ARZ-RL converts the RGB output of an industrial graphics controller into standards-compliant baseband video with both composite and S-Video outputs. The YTRAP luma trap port reduces cross-color artifacts caused by subcarrier-frequency components in the luminance signal, improving picture quality when displaying fine HMI detail such as text and graticules. TTL-compatible inputs allow direct connection to 3 V CMOS logic common in industrial controllers. The surface-mount 16-SOIC package withstands standard industrial assembly processes, and the active product status of the AD725 family on analog.com supports long-term sourcing for equipment with multi-year service life expectations.
推薦
Set-Top Box and Consumer Video Auxiliary Output
Set-top boxes, DVRs, and consumer AV products historically used the AD725 as the low-cost auxiliary composite/S-Video output stage feeding TV SCART or RCA inputs. The encoder's RGB inputs accept the graphics processor's component video, and its dual standard support (NTSC and PAL from one device) lets a single hardware design ship into multiple geographic markets with only configuration and subcarrier reference changes. The integrated luminance delay line maintains proper Y/C alignment without external delay components, reducing BOM cost. Cross-color performance on composite outputs is improved via the YTRAP pin, which is important when consumer content contains fine textures. With pricing in the low single-digit dollar range at 1000-piece volumes as of 2026-10-20, the AD725ARZ-RL remains one of the most economical ways to add a standards-compliant analog video output to a consumer design.
推薦
Video Test and Measurement Equipment
Bench instruments, pattern generators, and production test fixtures use the AD725ARZ-RL to produce reference NTSC/PAL composite and S-Video signals from internally generated RGB test patterns. Because the encoder implements standard luminance and chrominance encoding with integrated luma delay, its output is representative of consumer-grade signal characteristics, making it useful for verifying TV, monitor, and video-capture inputs. The YTRAP port allows the test designer to evaluate cross-color behavior deliberately by including or omitting the trap network. TTL-level control inputs interface directly with the 3 V CMOS logic of modern instrument FPGAs and microcontrollers, and the sub-1 uA power-down state supports battery-powered field testers. The 16-SOIC package reflows on standard instrument PCB processes, and tape-and-reel packaging supports the production volumes of instrument OEMs.
推薦
Retro Computing and Legacy System Restoration
Restoration and reproduction designs for retro computers, arcade boards, and legacy industrial systems rely on the AD725ARZ-RL to regenerate composite NTSC/PAL video from original RGB sources, since period-correct encoder chips are often obsolete. The AD725's straightforward RGB input interface matches the component-video output of vintage graphics chips, and its composite and S-Video outputs connect to modern TVs and capture devices. Designers of replacement boards appreciate that the AD725 family remains actively listed by Analog Devices, avoiding the obsolescence risk of alternatives, and that the datasheet's application circuits for the YTRAP network and subcarrier crystal reference are directly reusable. The low single-unit price as of 2026-10-20 also suits hobbyist-scale board runs, while tape-and-reel availability supports small commercial production of reproduction hardware.
推薦
推薦產品摘要
工程參考資料，適用於 AD725ARZ-RL — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD725ARZ | AD725AR-RL | AD725AR |
|---|---|---|---|---|
| Package | 16-SOIC (7.50 mm) | 16-SOIC (7.50 mm) - same | 16-SOIC (7.50 mm) - same | 16-SOIC (7.50 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Video Standards | NTSC and PAL | NTSC and PAL | NTSC and PAL | NTSC and PAL |
| Output Types | Composite + S-Video (Y/C) | Composite + S-Video (Y/C) | Composite + S-Video (Y/C) | Composite + S-Video (Y/C) |
| Luma Trap Port (YTRAP) | Yes | Yes | Yes | Yes |
| Power-Down Current | < 1 uA | < 1 uA | < 1 uA | < 1 uA |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tube |
| Finish / RoHS Variant | Z (RoHS-friendly finish) | Z (same finish) | Legacy (non-Z) finish | Legacy (non-Z) finish |
| Drop-In Compatibility | Reference | Pin-to-pin, identical die | Pin-to-pin, identical die | Pin-to-pin, identical die |
主要差異化特點
- RoHS-friendly Z-suffix finish in tape-and-reel (對比AD725AR-RL)
- Automated assembly packaging at identical cost class (對比AD725ARZ)
- Dual-standard output flexibility with sub-1 uA shutdown (對比AD725AR)
設計說明
Use the YTRAP pin exactly as specified in the AD725 datasheet application circuit: the external trap network tunes out subcarrier-frequency components from the luminance path. Without it, chroma energy leaking into luma shows up as rainbow shimmer on fine detail (stripes, text edges) in the composite output. Use accurate inductor and capacitor values with low-loss components, and verify the trap response at the NTSC (3.58 MHz) or PAL (4.43 MHz) subcarrier frequency appropriate to your configured standard.
Keep the analog video output traces short and route them away from the subcarrier crystal and digital RGB/sync lines to minimize crosstalk into the encoded video. Place decoupling capacitors close to the supply pins of the AD725, and ground the SOIC-16 device with a clean analog ground return. Since the encoder output feeds 75-ohm video loads, maintain controlled impedance and correct output back-termination to avoid reflections that appear as ghosting in the composite picture.
Exploit the power-down mode for battery designs: the AD725 draws less than 1 uA when shut down per the datasheet, so a GPIO from the system MCU can gate the video stage. Estimated: even at a modest 20 mA active current, a duty cycle of 1% active / 99% shutdown cuts average encoder consumption to roughly 0.2 mA plus leakage, which materially extends battery life in portable testers and handhelds. Confirm exact active-mode current from the datasheet electrical characteristics table for your supply conditions.
Do not confuse AD725 ordering codes when releasing the BOM: -RL means tape and reel, and the Z suffix denotes the RoHS-friendly lead-finish variant; mixing AD725AR (legacy finish, tube) into a RoHS assembly line can create compliance documentation issues even though the die is identical. Also verify that your graphics source provides RGB levels and sync timing matching the datasheet input requirements before layout sign-off.
合規資訊
The Z suffix in Analog Devices nomenclature conventionally denotes the RoHS-friendly lead finish, but explicit RoHS/REACH declarations were not present in the retrieved web data; verify on the official ADI product page before compliance sign-off.
