Overview
The AD724JR, produced by Analog Devices Inc., is a low-cost RGB to NTSC/PAL Encoder. This integrated circuit converts red, green, and blue color component signals into their corresponding luminance (baseband amplitude) and chrominance (subcarrier amplitude and phase) signals, adhering to either NTSC or PAL standards. The device provides composite video output and can drive 75 Ω, reverse-terminated cables. It operates from a single +5 V supply and is compatible with TTL, 3 V, and 5 V CMOS logical inputs. The AD724JR is designed to be power-efficient, allowing it to be powered down when not in use.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage | 4.75 V | 5 V | 5.25 V | V | |
| Input Amplitude (Full Scale) | 714 mV p-p | mV p-p | |||
| Black Level | 0.8 V | V | |||
| Input Resistance | 1 MΩ | Ω | |||
| Input Capacitance | 5 pF | pF | |||
| Operating Temperature | 0°C | 70°C | °C | ||
| Package | 16-Lead SOIC |
Key Features
- Low-cost, integrated solution for RGB to NTSC/PAL encoding.
- Operates from a single +5 V supply.
- Accepts FSC clock or crystal, or 4FSC clock.
- Provides composite video and separate Y/C (S-Video) outputs.
- Luma and chroma outputs are time-aligned.
- No external filters or delay lines required; onboard DC clamp.
- Logic selectable NTSC or PAL encoding modes.
- Compact 16-lead SOIC package.
- Compatible with TTL, 3 V, and 5 V CMOS logical inputs.
- Power-down capability when not in use.
Applications
The AD724JR is primarily used for converting RGB color component signals into NTSC or PAL video formats, making it suitable for various video encoding applications. This includes:
- RGB to NTSC or PAL encoding in consumer electronics and multimedia devices.
- Video conversion in gaming consoles, set-top boxes, and other video processing equipment.
- Industrial and commercial video systems requiring RGB to NTSC/PAL conversion.
Q & A
- What is the primary function of the AD724JR?
The AD724JR converts red, green, and blue color component signals into their corresponding luminance and chrominance signals in accordance with NTSC or PAL standards.
- What is the operating voltage of the AD724JR?
The AD724JR operates from a single +5 V supply.
- What types of clocks does the AD724JR accept?
The AD724JR accepts either FSC or 4FSC clock, or it can generate the necessary subcarrier clock using a low-cost parallel-resonant crystal.
- What are the output capabilities of the AD724JR?
The AD724JR provides composite video and separate Y/C (S-Video) outputs, and all three outputs can simultaneously drive 75 Ω, reverse-terminated cables.
- Does the AD724JR require external filters or delay lines?
No, the AD724JR does not require external filters or delay lines; it has an onboard DC clamp and integrated filters.
- What is the package type of the AD724JR?
The AD724JR comes in a 16-lead SOIC package.
- Is the AD724JR compatible with different logic levels?
Yes, the AD724JR is compatible with TTL, 3 V, and 5 V CMOS logical inputs.
- Can the AD724JR be powered down when not in use?
Yes, the AD724JR can be powered down when not in use to conserve power.
- What are the typical applications of the AD724JR?
The AD724JR is used in RGB to NTSC or PAL encoding in consumer electronics, gaming consoles, set-top boxes, and other video processing equipment.
- What is the operating temperature range of the AD724JR?
The AD724JR operates within the 0°C to +70°C commercial temperature range.
