Analog Devices Inc. AD8011ARZ

Overview

AD8011ARZ from Analog Devices is a current feedback amplifier optimized for single-supply 5 V operation, delivering 180 MHz –3 dB bandwidth at G = +2, 2000 V/µs slew rate, and 29 ns settling time to 0.1%, enabling high-fidelity video signal buffering and A/D converter driving in portable professional imaging systems.

For engineers reviewing the AD8011ARZ datasheet, AD8011ARZ pinout, AD8011ARZ application, or AD8011ARZ equivalent, key selection criteria include its low 1.15 mA quiescent current, differential gain error of 0.02% (NTSC, RL = 1 kΩ), and SOIC-8 package compatibility with space-constrained video switchers and ultrasound front-ends.

Technical Context

The AD8011ARZ employs a two-stage complementary current feedback architecture-distinct from traditional single-stage Nelson designs-to achieve high gain-bandwidth product with low distortion and wide common-mode input range (1.2 V to 3.8 V on +5 V supply). Its transimpedance open-loop gain (TO) dominates stability behavior over voltage gain (AO), enabling predictable bandwidth scaling across gains.

Unlike voltage-feedback op amps, closed-loop bandwidth varies minimally with gain setting due to current-mode signal path; bandwidth remains stable at 150–180 MHz (G = +2) and 270–328 MHz (G = +1) under single 5 V supply, while maintaining 0.1 dB flatness to 20 MHz and <0.06° differential phase error for NTSC video signals.

Key Specifications

Pinout & Package

AD8011ARZ is housed in an 8-lead SOIC (R-8) package with exposed pad not electrically connected. Pin 1 is marked by notch or dot; pins are numbered counterclockwise. No internal connection exists on pins 1, 3, 4, and 6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current feedback amplifier applications.

Compared with LMH6702MF/NOPB and THS3201DGN, AD8011ARZ uniquely balances ultra-low power (1.15 mA), single-supply operation (3–12 V), and broadcast-grade video linearity-making it the only option among the three qualified for battery-powered NTSC/PAL systems requiring <0.06° phase error.

Availability

AD8011ARZ is available at Aetrix Electronics and suitable for video switchers, ultrasound front-ends, and A-to-D converter driver applications requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for AD8011ARZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8011ARZ belongs to Analog Devices' high-speed current feedback amplifier product line, engineered specifically for low-power, single-supply video and data-acquisition signal conditioning where bandwidth, settling accuracy, and power efficiency are jointly critical.

FAQ

What supply voltage range does the AD8011ARZ support in single-supply mode?

The AD8011ARZ operates from +3 V to +12 V in single-supply configuration, with full AC and DC specifications guaranteed at +5 V. Its input common-mode range extends from 1.2 V to 3.8 V and output swing reaches 0.9 V to 4.1 V under these conditions-enabling direct interfacing with 3.3 V logic and 10-bit ADCs without level-shifting circuitry. This flexibility makes AD8011ARZ suitable for both battery-powered portable gear and fixed-line industrial video systems.

Does the AD8011ARZ require external compensation for stability with capacitive loads?

Yes-the AD8011ARZ is optimized for purely resistive loads. When driving >5 pF total capacitive load (including PCB trace and ADC input capacitance), a small series resistor (10–20 Ω) must be placed between AD8011ARZ output and the load to suppress high-frequency peaking and 2 GHz ringing. Figure 12 in the AD8011ARZ datasheet provides exact RSERIES vs. CL values; omitting this resistor risks overshoot and non-monotonic settling in ADC driver configurations.

How does the AD8011ARZ compare to voltage-feedback op amps in bandwidth versus gain trade-offs?

Unlike voltage-feedback op amps whose bandwidth drops inversely with closed-loop gain, the AD8011ARZ's current feedback architecture maintains stable bandwidth: 180 MHz at G = +2 and 270 MHz at G = +1 under +5 V supply. This results from its transimpedance-dominated loop gain (TO), making AD8011ARZ ideal for variable-gain video paths and programmable gain amplifier stages where consistent small-signal response across gain settings is essential.

Can the AD8011ARZ drive a 75 Ω video load directly without a series resistor?

No-driving a 75 Ω coaxial video load directly from AD8011ARZ output causes impedance mismatch and reflections. A 75 Ω series termination resistor must be placed at the amplifier output (not at the load end) to match source impedance and prevent standing waves. This configuration, combined with AD8011ARZ's 0.3 Ω output resistance and 30 mA drive capability, ensures flat frequency response and minimal group delay variation across the 0–25 MHz video band.

Is the AD8011ARZ pin-compatible with other SOIC-8 current feedback amplifiers like the AD8009?

No-AD8011ARZ has a unique pinout: pins 1, 3, 4, and 6 are NC, whereas AD8009 uses pin 4 as –IN and pin 5 as V–, with different internal connectivity. Substituting AD8011ARZ for AD8009 or vice versa without PCB revision will result in nonfunctional circuits due to misrouted supply, input, and output connections. Always verify pin mapping against the specific device's functional block diagram before layout reuse.