Analog Devices Inc. AD818AN

Overview

AD818AN from Analog Devices is a low-cost, low-power voltage-feedback video operational amplifier optimized for gain ≥ +2 or –1 configurations in analog video signal conditioning. It delivers 55 MHz 0.1 dB bandwidth (G = +2, V_S = +5 V), 0.01% differential gain error, and 0.05° differential phase error at NTSC 3.58 MHz, enabling high-fidelity cable driving in professional video cameras and broadcast equipment.

For engineers reviewing the AD818AN datasheet, AD818AN pinout, AD818AN application, or AD818AN equivalent, this page provides verified specifications including slew rate (300 V/µs min, +5 V), settling time (80 ns to 0.01%), output drive (30 mA min, single +5 V), and dual/±5 V to ±15 V supply compatibility - all critical for video line driver and back-terminated 75 Ω system design.

Technical Context

The AD818AN employs a degenerated NPN input stage feeding a folded-cascode gain stage and class AB emitter-follower output buffer, enabling high output current (≥30 mA) with low distortion. Its architecture supports stable operation driving capacitive loads ≤10 pF and back-terminated 75 Ω cables without oscillation.

It achieves 45 ns settling to 0.1% (±5 V, –2.5 V to +2.5 V step) and maintains <0.02% differential gain error across ±5 V to ±15 V supplies. Input common-mode range extends to ±13.4 V (±15 V supplies) and +4.3 V/–3.4 V (±5 V), supporting wide-swing video signal handling.

Key Specifications

Pinout & Package

AD818AN is housed in an 8-pin plastic mini-DIP (N-8) package with 0.300″ width, 0.100″ lead pitch, and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead plated.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video op amp applications.

Compared with AD818AN, LM6171IMX/NOPB offers superior speed but lacks video-specific characterization, while THS3091D delivers higher drive and speed at significantly higher power and supply voltage cost - making AD818AN the optimal balance of video fidelity, low power, and single-supply flexibility.

Availability

AD818AN is available at Aetrix Electronics and suitable for professional video camera front-ends, broadcast SDI driver stages, and medical endoscope video processors requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AD818AN 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 Wilmington, MA.

The AD818AN belongs to Analog Devices' precision video amplifier product line, engineered specifically for broadcast, medical imaging, and industrial vision systems demanding low differential gain/phase error and robust 75 Ω cable drive capability.

FAQ

What is the maximum capacitive load the AD818AN can drive stably?

The AD818AN is specified to drive capacitive loads up to 10 pF while maintaining stability across all gain configurations and supply voltages. This is confirmed in the "Cap Load Drive" specification (10 pF) and supported by typical characteristics showing stable closed-loop gain response with 2 pF compensation. For heavier loads, external compensation or isolation resistors are required. The AD818AN's internal architecture avoids peaking or ringing even at the 10 pF limit, making it suitable for PCB traces and connector parasitics in video routing.

Can the AD818AN operate from a single +3.3 V supply?

No - the AD818AN is not characterized or guaranteed for operation at +3.3 V. Its absolute minimum single-supply voltage is +5 V, and its input common-mode range at +5 V is +3.8 V to +4.3 V (positive) and +0.9 V to +1.2 V (negative side), which does not accommodate 3.3 V rail-to-rail operation. Attempting +3.3 V operation risks degraded bandwidth, increased distortion, and failure to meet differential gain/phase specs. For 3.3 V systems, consider newer video amplifiers like the ADA4807-1.

Does the AD818AN require external offset nulling in most video applications?

No - the AD818AN has a maximum input offset voltage of 2 mV (±5 V to ±15 V), and typical differential gain/phase performance is achieved without nulling. Offset nulling (via Pins 1/5/8) is only needed in DC-coupled precision applications where <0.5 mV residual offset is required. In AC-coupled video circuits with coupling capacitors and 75 Ω terminations, the inherent offset contributes negligible error to the 1 V_p-p signal swing, so the AD818AN operates fully functional out-of-the-box.

How does the AD818AN's performance differ between ±5 V and ±15 V supplies?

At ±15 V, the AD818AN delivers higher 3 dB bandwidth (130 MHz vs. 95 MHz at ±5 V, G = +2), greater output voltage swing (±13.4 V vs. ±3.6 V into 150 Ω), and lower differential phase error (0.045° vs. 0.06°). However, its 0.1 dB flatness remains 55 MHz only at ±15 V; at ±5 V it drops to 43 MHz. Quiescent current stays constant at 7.5 mA. Thus, ±15 V is preferred for maximum bandwidth and dynamic range, while ±5 V suits low-power, space-constrained designs where 43 MHz flatness suffices.

Is the AD818AN RoHS compliant and lead-free?

Yes - the AD818AN (plastic mini-DIP, N-8 package) is RoHS compliant and lead-free per Analog Devices' product change notice PCN-061206-0. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1). No exemption is applied; Pb-free solder reflow profiles are validated per IPC/JEDEC J-STD-020. Full compliance documentation is available in Analog Devices' official product page and material declarations.