Analog Devices Inc. ADA4851-2WYRMZ-R7

Product Summary

Analog Devices’ ADA4851-2WYRMZ-R7 is a dual, voltage feedback operational amplifier designed for modern, cost-sensitive systems where speed, rail-to-rail output, and low power consumption are crucial. Based on the ADA4851 family—available in single (ADA4851-1), dual (ADA4851-2), and quad (ADA4851-4) configurations—the ADA4851-2WYRMZ-R7 is specified for operation over a wide supply range (2.7 V to 12 V) and boasts true single-supply capability. Its automotive-grade variant (ADA4851-2W) ensures robust performance across harsh environments, making it well-suited for both automotive and high-performance consumer applications.

Main Functions of the ADA4851-2WYRMZ-R7 Series

The ADA4851-2WYRMZ-R7 series is engineered for demanding analog signal chains where high bandwidth and precision are essential. Key features include:

High Speed: 130 MHz, -3 dB bandwidth enables crisp signal fidelity in video and communication systems.

Fast Slew Rate: 375 V/μs provides rapid response to transient signals.

Video Performance: 0.1 dB flatness to 11 MHz, differential gain/phase of 0.08%/0.09°, ideal for video processing and switching.

Rail-to-Rail Output: Output swings to within 60 mV of either supply rail, maximizing dynamic range.

Low Voltage Offset: Typical offset of 0.6 mV enhances precision in sensor and filter circuits.

Wide Supply Range: 2.7 V to 12 V, including ±5 V operation; suitable for both legacy and advanced, low-voltage systems.

Low Power: Only 2.5 mA per amplifier.

Power-Down Mode: Reduces system power consumption in standby.

Packaging: Compact 8-lead MSOP, with options for SOT-23 and TSSOP across the ADA4851 family.

Electrical Specifications and Performance Metrics for ADA4851-2WYRMZ-R7

For system designers, the ADA4851-2WYRMZ-R7’s electrical specs deliver assurance in various supply environments with consistent performance at +3 V, +5 V, and ±5 V. At room temperature (25°C) and with recommended gains/load resistances, typical characteristics include:

Bandwidth: 130 MHz (-3 dB) with unity gain.

Slew Rate: 375 V/μs supports fast signal transitions.

Settling Time: 55 ns to 0.1% for precise output accuracy.

Differential Gain/Phase: 0.08%/0.09°, minimizing distortion for analog video.

Output Range: Within 60 mV of both supply rails under light load.

Quiescent Current: 2.5 mA/amplifier for battery-conscious and embedded designs.

Input Common-Mode Range: From 200 mV below negative rail to within 2.2 V of the positive rail, supporting full input swing for single-supply applications.

These capabilities are maintained over the extended temperature range (-40°C to +125°C), and the ADA4851-2WYRMZ-R7 is ROHS3 compliant, moisture sensitivity level 1 (unlimited), and meets REACH regulations.

Available Packages and Thermal Management for ADA4851-2WYRMZ-R7

The ADA4851 family offers versatile package options to suit various board footprints, including 8-lead MSOP (ADA4851-2WYRMZ-R7), with thermal resistance θJA rated at 150°C/W on a 4-layer JEDEC board. Proper thermal management is critical: maximum safe power dissipation is governed by junction temperature, not to exceed 150°C. Power dissipation is a combination of quiescent and output drive power, and detailed formulas in the documentation provide guidance for worst-case calculations under both single and dual supply operation. Enhanced airflow and increased PCB copper under the device reduce thermal resistance, improving reliability.

Use Cases ADA4851-2WYRMZ-R7 in Automotive and Video Applications

The ADA4851-2WYRMZ-R7 is optimized for a range of high-speed analog applications, with particular suitability for:

Automotive infotainment and driver assistance systems—where compact, high-fidelity amplification is needed for sensors, audio, and video signals.

Consumer and professional video equipment—such as cameras, displays, and video switchers requiring low distortion and tight gain/phase control.

Active filters and clock buffers—leveraging the high slew rate and bandwidth.

Automotive-grade units (ADA4851-2W) are specially tested for reliability in extended temperature ranges and stringent quality requirements on the assembly line.

Technical Recommendations Headroom, Overload Handling, and Signal Recovery with ADA4851-2WYRMZ-R7

To maximize performance in practical circuits, engineers should consider:

Input Headroom: The input common-mode voltage extends from below the negative rail to within 2.2 V of the positive rail, enabling broad support for single-supply operations and full-output swing.

Output Headroom: The rail-to-rail output approaches within 60 mV of the rails with light load and 0.17 V with a 150 Ω load.

Signal Integrity: As inputs or outputs approach supply rails, bandwidth may decrease and distortion may rise, especially for high-frequency signals.

Overload Recovery: Input overload recovery time is about 55 ns, while output overload recovery is typically within 35 ns. No phase reversal occurs even for inputs beyond voltage rails.

Short-term over-voltage can activate input protection diodes, leading to increased current draw; designers should ensure input signals remain within the specified common-mode range for best reliability.

Design Example Video Signal Amplification and Reconstruction Filtering with ADA4851-2WYRMZ-R7

A core advantage of the ADA4851-2WYRMZ-R7 is its performance in video applications:

Single-Supply Video Amplifiers: The device maintains output linearity and low distortion even as input approaches supply rails. Reference designs detail recommended voltages, gains, and load settings for optimal video processing.

Video Reconstruction Filters: High bandwidth and low phase distortion suit active filter applications at DAC/encoder outputs. The datasheet provides a three-pole, Sallen-Key filter schematic for an 8 MHz video reconstruction filter with over 17 dB attenuation at 27 MHz, demonstrating effective suppression of high-frequency artifacts in portable video systems.

Alternative or Compatible Models for ADA4851-2WYRMZ-R7

When evaluating alternatives, engineers can consider other members of the ADA4851 family such as ADA4851-1WYRMZ (single) and ADA4851-4WYRMZ (quad), offering identical electrical performance but differing in channel count and package. For automotive designs, the W-grade versions (ADA4851-1W, ADA4851-2W, ADA4851-4W) are specifically qualified to meet automotive standards. Cross-referencing similar rail-to-rail, high-speed op amps from Analog Devices or competing brands may be necessary if form factor or supply rail compatibility is a driving factor in system selection.

Conclusion

The ADA4851-2WYRMZ-R7 series from Analog Devices stands out as a cost-effective, high-performance dual op amp tailored for advanced analog systems in automotive and consumer video markets. With its combination of high speed, rail-to-rail output, low power consumption, and industry-standard package options, it offers an optimal solution for engineers prioritizing fidelity and reliability. Thorough understanding of its electrical characteristics, thermal constraints, and application-specific performance is essential to unlocking its full potential in modern electronic architectures. When matched appropriately to system requirements and evaluated alongside potential equivalent models, the ADA4851-2WYRMZ-R7 provides robust value throughout the design-in phase and into volume production.