Analog Devices Inc./Maxim Integrated MAX4387ESA+T

Overview

MAX4387ESA+T from Maxim Integrated is a dual, high-speed, voltage-feedback operational amplifier optimized as an ADC buffer for communications and instrumentation systems. It operates from a single +2.85V to +6.5V supply, delivers 150MHz −3dB bandwidth at gain = +5V/V, achieves 350V/µs slew rate, and features 88dBc SFDR at 5MHz - enabling high-fidelity signal conditioning ahead of 12–14-bit, 50+ MSPS analog-to-digital converters.

For engineers reviewing the MAX4387ESA+T datasheet, MAX4387ESA+T pinout, MAX4387ESA+T application, or MAX4387ESA+T equivalent, key selection criteria include its dual-channel architecture with independent gain-setting (AV = +5V/V), absence of disable functionality, 8-pin SO package compatibility, and performance under 3V/5V single-supply conditions in multiplexed or wideband front-end designs.

Technical Context

The MAX4387ESA+T is internally compensated for stable operation at minimum closed-loop gain of +5V/V, distinguishing it from unity-gain-stable variants like MAX4287. Its voltage-feedback topology supports precise gain accuracy and low distortion across wide frequency ranges, with input common-mode range extending to VEE (ground in single-supply use).

Unlike MAX4288/MAX4388, this device lacks dedicated disable pins; it remains continuously active. Its dual-amplifier structure shares power rails but has fully isolated signal paths, delivering 85dB crosstalk rejection at 10MHz and supporting independent channel configuration in differential or single-ended ADC driver topologies.

Key Specifications

Pinout & Package

MAX4387ESA+T is housed in an 8-pin SO (Small Outline) package, surface-mount, with standard JEDEC MO-153 footprint and 1.27mm lead pitch. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual op-amp ADC buffer applications.

Compared with MAX4287ESA+, the MAX4387ESA+T trades unity-gain stability for higher gain accuracy at AV = +5V/V and improved large-signal linearity; versus AD8021ARZ, it integrates two matched channels in one SO-8, reducing component count and inter-channel skew in synchronous sampling systems.

Availability

MAX4387ESA+T is available at Aetrix Electronics and suitable for high-speed data acquisition, communications infrastructure, and medical ultrasound systems requiring stable component supply with guaranteed long-term availability and traceable lot control.

Supply support for MAX4387ESA+T 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for demanding signal-chain applications, with emphasis on speed, precision, and power efficiency in harsh environments.

The MAX4285–MAX4388 family targets high-speed ADC interface challenges - delivering wide bandwidth, low distortion, and robust drive capability specifically for communications, instrumentation, and imaging front-ends.

FAQ

Does MAX4387ESA+T support single-supply operation?

Yes, MAX4387ESA+T operates from a single +2.85V to +6.5V supply, with input common-mode range extending to VEE (ground). This enables direct interfacing with ground-referenced sensors, DACs, or baseband signals without level-shifting circuitry - a key advantage in compact, low-voltage systems where MAX4387ESA+T serves as the final analog conditioning stage before ADC conversion.

What is the minimum stable gain for MAX4387ESA+T?

The MAX4387ESA+T is internally compensated for stable operation at closed-loop gains of +5V/V or greater. It is not unity-gain stable; attempting AV = +1V/V may cause peaking or oscillation. For lower-gain applications, consider MAX4287ESA+ instead - which shares the same 8-pin SO package but is unity-gain compensated and specified for 250MHz bandwidth at AV = +1V/V.

Does MAX4387ESA+T have a disable function?

No, MAX4387ESA+T does not include a disable feature. Unlike MAX4288ESA+ or MAX4388ESA+, it lacks DISABLEA/DISABLEB pins and remains continuously active. This simplifies control logic but means power cannot be gated per channel. If low-power multiplexing is required, MAX4387ESA+T must be used with external analog switches or replaced with a variant like MAX4388ESA+ that supports high-impedance output disable.

What decoupling is recommended for MAX4387ESA+T?

For MAX4387ESA+T, place a 0.1nF ceramic capacitor directly between VCC and VEE (Pin 5 to Pin 4), located ≤2mm from the pins, plus a 0.1µF bulk capacitor nearby. Use a solid ground plane and multiple vias to minimize inductance. This dual-capacitor strategy suppresses both high-frequency switching noise (0.1nF) and lower-frequency supply ripple (0.1µF), ensuring stable 150MHz operation - especially critical when MAX4387ESA+T drives fast-switching ADC inputs.

Can MAX4387ESA+T drive a 50Ω ADC input directly?

Yes, MAX4387ESA+T can drive a 50Ω ADC input directly, thanks to its ±106mA output current capability and linear output range of (VEE + 0.4V) to (VCC − 0.4V). At 3V supply, it delivers >1.2Vpp into 50Ω without clipping. However, for optimal stability with reactive ADC input capacitance, a 20–30Ω series isolation resistor is recommended between MAX4387ESA+T output and the ADC pin - preventing potential ringing while preserving bandwidth and settling performance.