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Analog Devices Inc. AD724JR-REEL
- Part No.:
- AD724JR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Encoders, Decoders, Converters
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD724JR-REEL.pdf
- Description:
- IC ENCODER RGB TO NTSC 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,152
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Product details
Overview
AD724JR-REEL from Analog Devices is a single-supply +5 V RGB-to-NTSC/PAL video encoder IC that converts R/G/B component inputs into time-aligned luma (Y), chroma (U/V), and composite outputs - supporting both NTSC (3.58 MHz) and PAL (4.43 MHz) standards with logic-selectable mode, onboard DC clamp, and 75 Ω reverse-terminated drive capability for broadcast-grade video generation in embedded graphics systems.
For engineers reviewing the AD724JR-REEL datasheet, AD724JR-REEL pinout, AD724JR-REEL application, or AD724JR-REEL equivalent, this device serves as a drop-in solution for VGA-to-TV conversion, MPEG decoder output encoding, and legacy display interface bridging where minimal external components, subcarrier clock flexibility (FSC/4FSC/crystal), and S-video + composite co-output are required.
Technical Context
The AD724JR-REEL implements a fully integrated analog RGB-to-YUV encoding matrix with on-chip 3-pole pre-delay Bessel filter (4.85 MHz NTSC / 6 MHz PAL), sampled-data 8FSC delay line for Y-path alignment, and dual 4-pole modified Bessel chroma filters (1.2 MHz NTSC / 1.5 MHz PAL). Its PLL-based subcarrier generation supports FSC or 4FSC input, while auto-tuned filter bandwidths ensure compliance with NTSC/PAL spectral masks without external tuning.
It features TTL/3V/5V-CMOS-compatible logic inputs, internal XNOR sync combiner for HSYNC/VSYNC→CSYNC conversion, ±180° V-phase alternation for PAL, and simultaneous LUMA/CRMA/COMP outputs each amplified to 2× standard level for direct 75 Ω reverse-terminated cable driving - all within a single 16-lead SOIC package operating from 0°C to +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.75 V to +5.25 V - enables stable operation with standard 5 V rail and ±5% tolerance margin. |
| Input Amplitude (RIN/GIN/BIN) | 714 mV p-p full scale - matches VGA DAC output swing and eliminates need for gain adjustment. |
| Luma-Chroma Time Alignment | 0 ns - ensures baseband timing coherence between Y and U/V paths for artifact-free TV display. |
| Chrominance Bandwidth | 3.6 MHz (NTSC) / 4.4 MHz (PAL) - meets ITU-R BT.470 spectral limits for color fidelity. |
| Differential Gain Error | 0.5% - preserves color saturation accuracy across luminance levels in composite output. |
| Quiescent Current (Encode Mode) | 33–42 mA - supports low-power operation in always-on video subsystems. |
| Power-Down Current | 1 mA - enables dynamic power gating during video blanking or standby. |
Pinout & Package
AD724JR-REEL is housed in a 16-lead wide-body SOIC (R-16) package with separate analog (APOS, AGND) and digital (DPOS, DGND) supply/ground pins to minimize noise coupling in mixed-signal operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (STND) | Standard Selection Input | CMOS/TTL logic HIGH = NTSC; LOW = PAL - configures filter bandwidths, phase modulation, and burst timing. |
| 3 (FIN) | FSC/4FSC Clock or Crystal Input | Accepts 3.58 MHz (NTSC) or 4.43 MHz (PAL) crystal with on-chip oscillator, or 14.32/17.73 MHz CMOS clock - eliminates external clock generator. |
| 5 (ENCD) | Encode Enable | Logic HIGH = active encoding; LOW = 1 mA power-down - enables system-level power management. |
| 6–8 (RIN/GIN/BIN) | RGB Analog Inputs | 714 mV p-p AC-coupled inputs with internal DC clamp - accepts standard VGA DAC outputs without level-shifting. |
| 9 (CRMA) | Chrominance Output | ~1.8 V p-p S-video signal - drives 75 Ω reverse-terminated line directly; requires series 75 Ω resistor at IC output. |
| 10 (COMP) | Composite Video Output | ~2.5 V p-p - combines Y and CRMA with correct burst insertion for NTSC/PAL monitors. |
| 11 (LUMA) | Luminance + Sync Output | ~2 V p-p - provides Y signal with embedded sync for S-video or baseband monitor interfaces. |
| 12 (SELECT) | FSC/4FSC Mode Control | LOW = FSC input with internal PLL multiplication; HIGH = bypassed 4FSC direct clock - selects clock architecture. |
| 15–16 (VSYNC/HSYNC) | Sync Inputs | XNOR-combined to generate CSYNC internally; also accepts external CSYNC via HSYNC pin with VSYNC held high. |
Key Features
| Feature | Design Value |
|---|---|
| Onboard DC Clamp | Automatically restores black level during back porch using external AC coupling capacitors - eliminates need for external clamping diodes or bias networks. |
| No External Filters or Delay Lines | Integrated 3-pole pre-filter, sampled-data delay line, and 2-pole post-filter replace discrete analog delay and filtering - reduces BOM count by ≥5 passive components. |
| Time-Aligned Y/C Outputs | Zero ns luma-chroma delay mismatch - prevents color fringing and ensures compatibility with broadcast monitors requiring strict timing alignment. |
| Crystal Oscillator Integration | On-chip parallel-resonant oscillator supports low-cost 3.58/4.43 MHz crystals - avoids external crystal driver IC and associated capacitors. |
| 75 Ω Reverse-Terminated Drive | All outputs amplified to 2× standard level - enables direct connection to 75 Ω coaxial cables with only series 75 Ω resistors at IC pins. |
Applications
| VGA-to-NTSC/PAL TV Conversion | MPEG Decoder Video Output Encoding |
|---|---|
Use Scenario: Converting interlaced RGB output from PC VGA controllers to NTSC or PAL signals for consumer television displays. IC Role / Device Role / Timing Role: RGB-to-YUV encoder with synchronous subcarrier lock, sync combiner, and composite/S-video co-generation. Use Value: Eliminates need for external sync generators, delay lines, or filter networks - enables single-chip VGA-to-TV bridge in space-constrained set-top boxes. |
Use Scenario: Encoding decoded MPEG video streams (e.g., from ADV7120 DAC output) into broadcast-compatible analog video formats. IC Role / Device Role / Timing Role: Final-stage analog encoder accepting DAC outputs and generating compliant NTSC/PAL baseband signals. Use Value: Provides guaranteed luma-chroma alignment and burst timing per ITU-R BT.470 - ensures playback compatibility across legacy TV sets and capture devices. |
| Legacy Display Interface Bridging | Embedded Graphics Subsystem Encoding |
Use Scenario: Interfacing modern microcontroller or FPGA-based RGB graphics engines to analog CRT or LCD panels requiring composite or S-video input. IC Role / Device Role / Timing Role: Standards-compliant video format translator with programmable NTSC/PAL selection and flexible clock sourcing. Use Value: Supports both crystal and external clock options - simplifies design across regional variants without PCB changes. |
Use Scenario: Integrating video output capability into industrial HMIs, medical displays, or avionics systems requiring ruggedized, temperature-stable encoding. IC Role / Device Role / Timing Role: Low-power, single-supply encoder with 0°C to +70°C commercial grade rating and ESD-hardened I/O. Use Value: Delivers 1 mA power-down mode and 42 mA active current - extends battery life in portable diagnostic or field-deployable equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB-to-analog-video encoding applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD725JRZ-REEL | Pin-compatible upgrade with improved differential gain (0.25% vs. 0.5%) and extended 0°C to +85°C temp range; adds 480p/576p progressive scan support. | Required for designs needing higher resolution progressive output or extended temperature operation beyond +70°C. | Select AD725JRZ-REEL when upgrading legacy AD724-based systems for enhanced video quality or wider thermal envelope. |
| MAX253CSA+ | Lower integration: requires external crystal oscillator, sync separator, and output amplifiers; no onboard DC clamp or delay line. | Suitable for cost-sensitive designs where board area is not constrained and external component count is acceptable. | Choose MAX253CSA+ only if BOM cost reduction outweighs layout complexity and performance trade-offs in non-critical applications. |
Compared with AD724JR-REEL, AD725JRZ-REEL offers measurable improvements in differential gain and temperature range while maintaining pin and function compatibility, whereas MAX253CSA+ demands additional external circuitry and delivers lower baseline video fidelity - making AD724JR-REEL the optimal balance of integration, performance, and commercial-temperature reliability.
Availability
AD724JR-REEL is available at Aetrix Electronics and suitable for VGA-to-TV conversion, MPEG decoder interfacing, and legacy display bridging requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for AD724JR-REEL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and video markets since 1965.
The AD724JR-REEL belongs to Analog Devices' video encoder product line, designed specifically for cost-effective, single-chip RGB-to-NTSC/PAL conversion in embedded graphics systems where minimal external components and guaranteed timing alignment are critical.
FAQ
What video standards does the AD724JR-REEL support?
The AD724JR-REEL supports both NTSC (525-line, 60 Hz) and PAL (625-line, 50 Hz) analog video standards. It achieves this through logic-selectable STND pin configuration, which reprograms internal filter bandwidths, chroma phase modulation (±180° alternation for PAL), and burst timing parameters. The AD724JR-REEL does not support NTSC 4.43 or M-PAL variants due to fixed subcarrier frequency dependencies.
Can the AD724JR-REEL accept a crystal directly, or does it require an external oscillator?
The AD724JR-REEL accepts a parallel-resonant crystal directly on the FIN pin (Pin 3) - no external oscillator is needed. For NTSC, a 3.579545 MHz crystal with 10–30 pF shunt capacitance is used; for PAL, a 4.433619 MHz crystal is required. The on-chip oscillator circuit drives the crystal, and the internal PLL generates the necessary 4FSC clock for encoding operations.
How does the AD724JR-REEL handle sync signal inputs?
The AD724JR-REEL accepts either separate HSYNC and VSYNC signals (internally combined via XNOR gate to generate CSYNC) or a single external CSYNC signal applied to the HSYNC pin while VSYNC is held high (> +2 V). The internal sync separator detects valid horizontal pulses to time burst insertion, and unclocked CSYNC is injected into the luminance path for sync overlay - ensuring precise placement per NTSC/PAL specifications.
What is the purpose of the ENCD pin on the AD724JR-REEL?
The ENCD pin (Pin 5) controls power state: a logic HIGH enables full encode functionality with typical 33–42 mA supply current, while a logic LOW places the AD724JR-REEL into power-down mode drawing only 1 mA. This allows dynamic power gating during vertical blanking intervals or system standby, reducing thermal load and extending battery life in portable video applications using the AD724JR-REEL.
Does the AD724JR-REEL require external passive components for basic operation?
The AD724JR-REEL requires minimal external components: three 75 Ω terminations near RIN/GIN/BIN inputs, three 220 µF AC-coupling capacitors on COMP/LUMA/CRMA outputs, a 75 Ω series resistor at each output pin, and optional crystal + tuning capacitor on FIN. No external filters, delay lines, or clamping diodes are needed - the AD724JR-REEL integrates all core encoding functions on-die.
AD724JR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Video Encoder
- Applications:
- RGB to NTSC/PAL
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
AD724JR-REEL FAQ
1.How can I place an order for AD724JR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD724JR-REEL 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 AD724JR-REEL reliable?
The price and inventory of AD724JR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD724JR-REEL is usually 5 days.
3.What payment methods are accepted for AD724JR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD724JR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD724JR-REEL?
AD724JR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD724JR-REEL 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 AD724JR-REEL?
For technical support, including AD724JR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD724JR-REEL requirements.
6.How does Aetrix verify that AD724JR-REEL is sourced from the original manufacturer or authorized distributors?
All AD724JR-REEL 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 AD724JR-REEL meets industry standards.
7.What is the process for return or replacement of AD724JR-REEL?
All AD724JR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD724JR-REEL, 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 AD724JR-REEL part is unused and in its original packaging.
Return procedure for AD724JR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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