Analog Devices Inc./Maxim Integrated MAX4305ESA+

Overview

MAX4305ESA+ from Maxim Integrated is a high-speed, low-noise, voltage-feedback operational amplifier optimized for minimum closed-loop gain of +10V/V, delivering 340MHz -3dB bandwidth and 1400V/µs slew rate in a 5-pin SOT23 package. It features 2.1nV/√Hz input voltage noise density, -88dBc spurious-free dynamic range at 5MHz (RL = 100Ω), ±70mA output drive, and operates on ±3.5V to ±5.5V dual supplies. It is used in precision video line drivers and high-speed ADC input buffers where gain stability and wideband fidelity are critical.

For engineers reviewing the MAX4305ESA+ datasheet, MAX4305ESA+ pinout, MAX4305ESA+ application, or MAX4305ESA+ equivalent, key selection criteria include its +10V/V minimum stable gain requirement, 340MHz bandwidth at AVCL = +10, 1400V/µs slew rate, differential gain/phase error of 0.02%/0.02° (NTSC, RL = 150Ω), and SOT23-5 thermal and layout constraints for high-frequency stability.

Technical Context

The MAX4305ESA+ is internally compensated for stable operation only at closed-loop gains ≥ +10V/V, distinguishing it from the +1V/V-stable MAX4104 and +2V/V-stable MAX4304. Its 340MHz -3dB bandwidth and 115MHz full-power bandwidth (VOUT = 2Vp-p) are specified under AVCL = +10, VCC = +5V, VEE = -5V, RL = 100Ω, TA = +25°C.

It achieves ultra-low distortion via matched transistor pairs and proprietary biasing, yielding -88dBc SFDR at 5MHz and harmonic distortion < -70dBc up to 10MHz with 2Vp-p output swing. Input common-mode range spans -2.8V to +4.1V, and output swings ±3.5V into 100Ω while sourcing/sinking ±70mA.

Key Specifications

Pinout & Package

MAX4305ESA+ is housed in a RoHS-compliant 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not connected internally. Thermal resistance θJA = 220°C/W (on 1-in² FR4 board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4305ESA+, MAX4304ESA+ offers higher bandwidth but lower minimum gain, making it unsuitable for +10V/V circuits without modification; LMH6702MF/NOPB provides broader gain flexibility and higher speed but lacks factory compensation for +10V/V, increasing design risk in production-critical video systems.

Availability

MAX4305ESA+ is available at Aetrix Electronics and suitable for video line drivers, high-speed ADC input buffers, ultrasound receiver amplifiers, and active filter stages requiring stable component supply and guaranteed long-term availability.

Supply support for MAX4305ESA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX4305ESA+ belongs to Maxim's ultra-high-speed op amp family designed specifically for low-distortion, low-noise video, telecom, and instrumentation signal conditioning where gain stability, bandwidth, and DC precision must coexist.

FAQ

What is the minimum stable closed-loop gain for MAX4305ESA+?

The MAX4305ESA+ is internally compensated for stable operation only at closed-loop gains of +10V/V or greater. Using it at lower gains (e.g., +5V/V or unity gain) will cause instability, oscillation, or excessive peaking. This is confirmed in the datasheet's "Selector Guide" and AC Electrical Characteristics table, where bandwidth and slew rate are explicitly tested at AVCL = +10.

Does MAX4305ESA+ support single-supply operation?

No, MAX4305ESA+ is a dual-supply op amp requiring symmetric or asymmetric bipolar rails (e.g., ±5V, ±3.5V, or +5V/–3.5V). Its input common-mode range is –2.8V to +4.1V and output swing is ±3.5V into 100Ω - both referenced to ground - and it lacks rail-to-rail input or output architecture. Single-supply use would violate absolute maximum ratings and disable proper biasing.

What is the recommended power-supply bypassing for MAX4305ESA+?

Per Maxim's Applications Information, place a 0.1µF ceramic capacitor and a 1nF ceramic capacitor in parallel between each supply pin (VCC and VEE) and the ground plane, located ≤2mm from the SOT23-5 package. Optionally add a 10µF tantalum capacitor at the PCB power entry point. Avoid shared supply traces with digital ICs to prevent noise coupling into the MAX4305ESA+ analog path.

Can MAX4305ESA+ drive a 75Ω coaxial cable directly?

Yes - MAX4305ESA+ can drive a 75Ω coaxial cable when configured as a back-terminated line driver (e.g., 75Ω series resistor at output, 75Ω shunt at load end). Its ±70mA output current and ±3.5V swing into 100Ω ensure compliance with broadcast video level standards. Layout must use controlled-impedance microstrip and minimize stubs to preserve 340MHz signal integrity.

What is the maximum capacitive load MAX4305ESA+ can drive without oscillation?

The MAX4305ESA+ drives up to 10pF of capacitive load without oscillation, as verified in the "Driving Capacitive Loads" section and Figure 3d of the datasheet. For larger loads (e.g., 47pF), a series isolation resistor (e.g., 15Ω) must be added between OUT and CL to restore phase margin - values are plotted in Figure 5 for MAX4305-specific curves.