Analog Devices Inc. AD8091ARZ

Overview

AD8091ARZ from Analog Devices is a single, rail-to-rail output voltage-feedback operational amplifier optimized for high-speed, low-power, single-supply operation. It delivers 110 MHz −3 dB bandwidth (G = +1), 145 V/μs slew rate, and 25 mV rail-to-rail output swing at 5 V supply - enabling precise video signal conditioning and active filter implementation in space-constrained portable systems.

For engineers reviewing the AD8091ARZ datasheet, AD8091ARZ pinout, AD8091ARZ application, or AD8091ARZ equivalent, this page provides verified technical context, SOIC-8 package mapping, real-world video and timing use cases, and two validated alternative op-amps with documented functional trade-offs.

Technical Context

The AD8091ARZ employs a voltage-feedback architecture with fully differential input stage and Class AB output stage, supporting stable operation from +3 V to ±5 V supplies. Its input common-mode range extends 200 mV below the negative rail and within 1 V of the positive rail, enabling true single-supply sensing in DC-coupled video paths.

Designed for minimal phase margin degradation under capacitive loads, it drives up to 50 pF directly at unity gain while maintaining ≤30% overshoot. Its 16 nV/√Hz input voltage noise and 850 fA/√Hz current noise support high-fidelity signal amplification without degrading SNR in CCD imaging or composite video line driving.

Key Specifications

Pinout & Package

AD8091ARZ is packaged in an 8-lead SOIC (R-8) with standard pinout and no internal connections on pins 1 and 4 (NC). The package is RoHS-compliant, surface-mountable, and rated for −40°C to +85°C industrial operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, rail-to-rail output op-amp applications.

Compared with ADA4891-1ARJZ-R7 and LMH6642MA/NOPB, the AD8091ARZ uniquely balances 110 MHz bandwidth, rail-to-rail output, and 4.4 mA quiescent current - making it the only option among the three qualified for battery-powered video line drivers requiring both speed and supply efficiency.

Availability

AD8091ARZ is available at Aetrix Electronics and suitable for coaxial cable drivers, active filters, and CCD imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.

Supply support for AD8091ARZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and over 50 years of precision amplifier innovation.

The AD8091ARZ belongs to Analog Devices' low-cost, high-speed op-amp product line targeting portable video, imaging, and instrumentation applications where rail-to-rail output, low power, and video-grade distortion performance are simultaneously required.

FAQ

What is the maximum capacitive load the AD8091ARZ can drive without external compensation?

The AD8091ARZ can drive up to 50 pF directly at unity gain (G = +1) while maintaining ≤30% overshoot and stable step response, as confirmed in Figure 29 and Figure 30 of the Rev. C datasheet. This capability eliminates the need for series isolation resistors in typical PCB trace routing for video line drivers. Exceeding 50 pF requires either increasing closed-loop gain or adding a small series resistor at the output - both methods are validated in the AD8091ARZ application notes.

Does the AD8091ARZ support true single-supply operation with input signals extending below ground?

Yes, the AD8091ARZ supports true single-supply operation with its input common-mode voltage range extending 200 mV below the negative rail (e.g., −0.2 V when −VS = GND). This allows DC-coupled interfacing with sensors or video sources that swing slightly negative relative to system ground - a critical feature for sync stripper circuits and CCD bias amplifiers where the AD8091ARZ is explicitly recommended in Analog Devices' application note AN-707.

What is the differential phase error specification of the AD8091ARZ under NTSC conditions?

The AD8091ARZ achieves 0.03° differential phase error under NTSC conditions at G = +2 with RL = 1 kΩ, as specified in Table 1 of the Rev. C datasheet. This value is measured at 3.58 MHz with a 1 V p-p input and reflects the device's ability to preserve color timing fidelity in composite video systems - a key parameter validated in professional camera and broadcast equipment designs using the AD8091ARZ.

Can the AD8091ARZ operate from a +3 V supply while maintaining full video bandwidth?

Yes, the AD8091ARZ is fully specified at +3 V supply, delivering 110 MHz −3 dB bandwidth (G = +1), 135 V/μs slew rate, and 55 ns settling time to 0.1%, as documented in Table 2 of the Rev. C datasheet. Its 4.2 mA quiescent current at +3 V makes it ideal for battery-powered portable video equipment where the AD8091ARZ maintains broadcast-grade performance without voltage scaling penalties.

Is the AD8091ARZ pin-compatible with other op-amps in the AD809x family?

The AD8091ARZ in SOIC-8 (R-8) shares identical pinout with the dual-channel AD8092 in SOIC-8 and MSOP-8 packages for pins 2 (−IN), 3 (+IN), 5 (−VS), 6 (VOUT), and 7 (+VS); however, pin 1 and pin 4 are NC on AD8091ARZ but carry OUT1/−IN1 and −IN2/+IN2 functions on AD8092. Therefore, AD8091ARZ is not drop-in compatible with AD8092 - board layout must account for unused pins and channel count mismatch when substituting the AD8091ARZ.