AD828AR: High-Performance Voltage Feedback Amplifier by Analog Devices Inc.

The AD828AR is a precision voltage feedback amplifier from Analog Devices Inc., designed for high-speed signal processing in demanding applications. Despite being marked as obsolete, this IC remains a popular choice among engineers due to its exceptional performance, reliability, and versatility. In this comprehensive guide, we explore the AD828AR's features, technical specifications, and real-world applications to help you understand why it's still relevant in modern electronics design.

AD828AR Overview and Key Features

The AD828AR belongs to Analog Devices' family of high-performance amplifiers, offering outstanding characteristics that make it suitable for professional audio, video, and instrumentation applications. This dual-channel amplifier comes in a compact 8-SOIC package, making it ideal for space-constrained designs.

Technical Specifications

• Bandwidth: 130MHz (-3dB) for high-frequency applications
• Slew Rate: 450V/ s enables fast signal response
• Supply Voltage Range: 2.5V to 18V (dual) or 5V to 36V (single)
• Current Consumption: 14mA typical supply current
• Output Current: 50mA per channel
• Package: 8-lead SOIC for surface mount applications

Detailed Performance Analysis

The AD828AR stands out in its class due to several performance advantages:

1. Voltage Feedback Architecture

The voltage feedback design provides excellent gain accuracy and stability across various operating conditions. This makes the AD828AR particularly suitable for applications requiring precise signal reproduction.

2. High-Speed Operation

With a 130MHz bandwidth and 450V/ s slew rate, the AD828AR can handle:

• HD video signals up to 1080p resolution
• High-speed data acquisition systems
• RF signal processing applications

3. Flexible Power Options

The wide supply voltage range allows designers to implement the AD828AR in:

• Portable battery-operated devices ( 2.5V)
• Industrial equipment ( 15V)
• High-voltage systems (up to 18V)

Applications of AD828AR

The AD828AR finds use in numerous professional and industrial applications:

Video Processing Systems

Ideal for:

• Broadcast video equipment
• HD video distribution amplifiers
• Video surveillance systems
• Medical imaging devices

Professional Audio Equipment

Used in:

• Studio mixing consoles
• High-end audio amplifiers
• Digital audio workstations

Test and Measurement

Excellent for:

• Oscilloscope vertical amplifiers
• Signal generators
• Data acquisition systems

Design Considerations

When implementing the AD828AR in your design, consider:

1. PCB Layout

Proper grounding and signal routing are critical for maintaining the amplifier's high-frequency performance. Use:

• Ground planes for noise reduction
• Short signal paths
• Proper decoupling capacitors

2. Thermal Management

While the 8-SOIC package has good thermal characteristics, high ambient temperatures may require:

• Adequate airflow
• Thermal vias in the PCB
• Heat sinks for high-power applications

3. Alternative Components

For newer designs, consider these alternatives:

• ADA4858 for higher bandwidth (300MHz)
• AD8065 for lower power consumption
• AD8009 for ultra-high speed (1GHz)

Why Choose AD828AR?

Despite newer alternatives, the AD828AR remains popular because:

• Proven reliability in field applications
• Consistent performance across temperature ranges
• Wide availability from component distributors
• Extensive documentation and application notes

Conclusion

The AD828AR voltage feedback amplifier from Analog Devices continues to be a top choice for engineers requiring high-speed, high-performance amplification. Its combination of wide bandwidth, fast slew rate, and flexible power options make it suitable for demanding applications in video, audio, and instrumentation fields. While newer alternatives exist, the AD828AR's proven track record and consistent performance ensure its continued use in professional electronic designs.

For engineers working with legacy systems or requiring specific performance characteristics, the AD828AR offers an excellent balance of speed, precision, and reliability that's hard to match in its class.