Introduction
The ADV7391BCPZ is a 10-bit high-speed video encoder manufactured by Analog Devices, converting digital video (YCrCb, RGB) to analog composite (CVBS), S-Video (Y/C), or component (YPbPr) outputs with integrated 6-DAC architecture in 32-pin LFCSP package, designed for video display, surveillance, automotive displays, and industrial imaging applications.
This complete video DAC integrates triple 10-bit DACs for SD/ED/HD video encoding with built-in filters, sync generators, and programmable features via I²C interface, enabling straightforward digital-to-analog video conversion from processors, FPGAs, and SoCs to standard-definition and enhanced-definition displays.
Technical Overview
Core Specifications
| Parameter | Specification |
|---|---|
| Resolution | 10-bit per channel |
| DAC Channels | 6 independent DACs |
| Video Standards | NTSC, PAL, SECAM |
| Output Formats | Composite (CVBS), S-Video, Component (YPbPr) |
| Sample Rate | 27 MHz / 54 MHz |
| Interface | I²C control, 8/16-bit pixel input |
| Supply Voltage | 1.8V (digital), 3.3V (analog) |
| Package | LFCSP-32 (5×5mm) |
Key Features
Multiple Output Formats:
- Composite Video (CVBS): Single BNC/RCA output
- S-Video (Y/C): Luminance + Chrominance separate
- Component (YPbPr): Red/Green/Blue difference signals
- Simultaneous output capability
Triple 10-Bit DACs:
- 6 DACs enable flexible routing
- High SNR (>66dB)
- Low differential gain/phase errors
- Integrated reconstruction filters
Programmable Control:
- I²C interface (standard/fast mode)
- Configurable video standards
- Adjustable brightness/contrast/saturation
- Built-in test pattern generator
Integrated Features:
- On-chip sync generator
- Color space converter (RGB↔YCrCb)
- Programmable gain/offset
- Low power modes
Complete Specifications
Video Performance
| Parameter | Typical | Unit |
|---|---|---|
| SNR (Signal-to-Noise Ratio) | 66 | dB |
| Differential Gain | 1 | % |
| Differential Phase | 1 | Degrees |
| THD (Total Harmonic Distortion) | -60 | dB |
Digital Interface
| Parameter | Value |
|---|---|
| Pixel Input | 8-bit or 16-bit |
| Input Format | YCrCb 4:2:2, RGB |
| Clock Rate | 13.5-54 MHz |
| Control Interface | I²C (100kHz/400kHz) |
Output Specifications
Composite (CVBS):
- 1.0Vp-p into 75Ω
- NTSC/PAL/SECAM support
S-Video (Y/C):
- Y: 1.0Vp-p, C: 0.286Vp-p (NTSC)
- Separate luminance/chrominance
Component (YPbPr):
- Y: 1.0Vp-p, Pb/Pr: 0.7Vp-p
- SD/ED/HD progressive formats
Applications
Consumer Video
Set-Top Boxes:
- Digital TV to analog conversion
- DVR playback to legacy displays
- Streaming devices (Roku, Apple TV legacy)
Media Players:
- DVD/Blu-ray analog outputs
- Portable media players
- Retro gaming consoles
Surveillance Systems
CCTV Cameras:
- IP camera analog output
- DVR composite outputs
- Monitor distribution
Video Analytics:
- AI vision system display
- Annotation overlay outputs
- Multi-camera display walls
Automotive
Rear-View Cameras:
- Backup camera displays
- 360° surround view
- Parking assistance
Infotainment:
- Video playback to headrest displays
- Auxiliary video outputs
- Legacy system integration
Industrial Imaging
Machine Vision:
- Inspection system displays
- Operator interface monitors
- Process monitoring
Medical Displays:
- Surgical camera outputs
- Diagnostic equipment
- Endoscopy systems
Design Guide
Basic Configuration
Minimal Application:
Digital Video Source (FPGA/Processor):
- YCrCb 4:2:2 or RGB input
- 8-bit or 16-bit pixel bus
- Pixel clock (13.5-54 MHz)
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ADV7391BCPZ
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Analog Outputs:
- CVBS → Composite Video Out (BNC/RCA)
- Y/C → S-Video Out (4-pin mini-DIN)
- YPbPr → Component Out (3× RCA)
Control: I²C (SDA/SCL) from host MCU
I²C Configuration
Device Address:
- 7-bit address: 0x2A (default)
- Configurable via pins
Initialization Sequence:
- Power-up (1.8V digital, 3.3V analog)
- I²C write: Select video standard (NTSC/PAL)
- Configure input format (YCrCb/RGB)
- Set output enables
- Adjust picture parameters (optional)
Example Register Settings:
Register 0x17: NTSC mode
Register 0x01: Input format = YCrCb 4:2:2
Register 0x00: Power mode = normal
Register 0x82: Enable DAC outputs
External Components
Required:
- Power decoupling: 0.1μF + 10μF per supply
- Output coupling: 75Ω termination resistors
- Reconstruction filters: External LC filters (optional for HD)
Optional:
- Crystal: 27 MHz if internal PLL used
- Output buffers: For multiple loads
PCB Layout
Best Practices:
- Separate analog/digital ground planes
- Star grounding at single point
- Short, controlled-impedance video traces (75Ω)
- Bypass capacitors close to supply pins
- Avoid routing digital signals near DAC outputs
Conclusion
The ADV7391BCPZ delivers complete digital-to-analog video conversion with 10-bit triple-DAC architecture supporting composite, S-Video, and component outputs from digital video sources. With integrated filters, sync generation, and I²C programmability in compact 5×5mm package, it enables straightforward analog video output for set-top boxes, surveillance, automotive, and industrial applications.
Key Advantages:
✅ Multi-Format Output: CVBS, S-Video, Component from one chip
✅ 10-Bit DACs: High video quality with 66dB SNR
✅ Integrated Features: Filters, sync, color space conversion
✅ Easy Configuration: I²C programmable standards and parameters
✅ Compact: 5×5mm LFCSP package
✅ Proven: Industry-standard video encoder solution
Designing video output systems? Visit AiChipLink.com for technical resources and video design consultation.
Written by Jack Elliott from AIChipLink.
AIChipLink, one of the fastest-growing global independent electronic components distributors in the world, offers millions of products from thousands of manufacturers, and many of our in-stock parts is available to ship same day.
We mainly source and distribute integrated circuit (IC) products of brands such as Broadcom, Microchip, Texas Instruments, Infineon, NXP, Analog Devices, Qualcomm, Intel, etc., which are widely used in communication & network, telecom, industrial control, new energy and automotive electronics.
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Frequently Asked Questions
What is ADV7391BCPZ used for?
The ADV7391BCPZ is a video encoder that converts digital video signals into analog composite, S-Video, or component (YPbPr) outputs for applications such as set-top boxes, surveillance systems, automotive displays, and media players.
What video standards does ADV7391BCPZ support?
The ADV7391BCPZ supports NTSC, PAL, and SECAM video standards and can output composite (CVBS), S-Video (Y/C), or component (YPbPr) signals.
How is ADV7391BCPZ configured?
The device is configured through an I²C interface, allowing the host processor to set the video standard, input format, and enable the DAC outputs.
What is the output voltage level of ADV7391BCPZ?
The encoder provides 1.0 Vp-p composite output into a 75Ω load, meeting standard analog video signal levels.
Does ADV7391BCPZ support HD video?
The ADV7391BCPZ mainly targets standard-definition video, but it can support progressive formats such as 480p or 576p through component output.
