Overview
The AD725ARZ-RL, produced by Analog Devices Inc., is a low-cost, general-purpose RGB to NTSC/PAL encoder. This integrated circuit converts red, green, and blue color component signals into their corresponding luminance and chrominance signals, adhering to either NTSC or PAL video standards. The device provides separate outputs for luminance, chrominance, and composite video, each at twice the standard signal levels to drive 75 Ω, reverse-terminated cables. It is particularly useful for applications requiring efficient and reliable video encoding.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| SIGNAL INPUTS (RIN, GIN, BIN) | Input Amplitude Full Scale | 0.714 | mV p-p | ||
| Black Level | 0.8 | V | |||
| Input Resistance | 1 | MΩ | |||
| Input Capacitance | 5 | pF | |||
| LOGIC INPUTS (HSYNC, VSYNC, 4FSC, CE, STND) | Logic Low Input Voltage | 1 | V | ||
| Logic High Input Voltage | 2 | V | |||
| Logic Low Input Current (DC) | 1 | µA | |||
| Logic High Input Current (DC) | 1 | µA | |||
| VIDEO OUTPUTS | Luminance (LUMA) Bandwidth, –3 dB | 4.4 MHz (NTSC), 5.2 MHz (PAL) | |||
| Gain Error | -7 | -2 | +7 | % | |
| Power Supply | Operating Voltage | +5 | V | ||
| Power-Down Current | <1 | µA |
Key Features
- Composite Video Output: Both NTSC and PAL standards supported.
- Chrominance and Luminance (S-Video) Outputs.
- Luma Trap Port to eliminate cross color artifacts.
- TTL Logic Levels compatible with 3 V CMOS systems.
- Integrated Delay Line and Auto-Tuned Filters.
- Drives 75 Ω reverse-terminated loads.
- Low Power +5 V Operation.
- Power-Down to less than 1 µA current consumption.
- Packaged in a low-cost 16-lead SOIC.
Applications
- RGB/VGA to NTSC/PAL Encoding.
- Personal Computers and Network Computers.
- Video Games.
- Video Conference Cameras.
- Digital Still Cameras.
Q & A
- What is the primary function of the AD725ARZ-RL?
The AD725ARZ-RL converts red, green, and blue color component signals into their corresponding luminance and chrominance signals according to NTSC or PAL video standards. - What types of video outputs does the AD725ARZ-RL provide?
The device provides separate outputs for luminance, chrominance, and composite video. - What is the significance of the Luma Trap Port?
The Luma Trap Port helps in eliminating cross color artifacts generated by subcarrier frequency components in the luminance signal. - What are the logic levels supported by the AD725ARZ-RL?
The device supports TTL logic levels, which are compatible with 3 V CMOS systems. - How does the AD725ARZ-RL manage power consumption?
The device operates at a low power +5 V and can be powered down to less than 1 µA current consumption. - What is the package type of the AD725ARZ-RL?
The device is packaged in a 16-lead SOIC. - What are some common applications of the AD725ARZ-RL?
Common applications include RGB/VGA to NTSC/PAL encoding, personal computers, video games, video conference cameras, and digital still cameras. - What is the input amplitude range for the RGB signals?
The full-scale range of the RGB inputs is 0.714 mV p-p. - How should the RGB inputs be terminated?
The RGB inputs should be terminated with 75 Ω to ground close to the respective pins. - What is the bandwidth of the luminance output for NTSC and PAL?
The luminance bandwidth is 4.4 MHz for NTSC and 5.2 MHz for PAL.
