Analog Devices Inc./Maxim Integrated MAX4484AXK-T

Overview

The MAX4484AXK-T from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier optimized for low-cost, single-supply systems. It delivers 7MHz gain-bandwidth, ±0.3mV typical input offset voltage, rail-to-rail output swing within 50mV of supply rails into 2kΩ, and stable operation with up to 100pF capacitive loads - enabling precision signal conditioning in portable sensor interfaces and zero-crossing detection circuits.

For engineers reviewing the MAX4484AXK-T datasheet, MAX4484AXK-T pinout, MAX4484AXK-T application, or MAX4484AXK-T equivalent, this op amp is selected for its combination of wide 2.7V–5.5V supply range, ground-sensing inputs, no phase reversal on overdrive, and ultra-small SC70-5 packaging - critical for space-constrained, battery-powered instrumentation and automotive-qualified modules.

Technical Context

The MAX4484AXK-T employs a CMOS input stage with 1000GΩ input resistance and pA-level bias current, enabling high-impedance sensor interfacing without loading. Its unity-gain stable architecture achieves 55° phase margin and 12dB gain margin at 7MHz, supporting fast settling (450ns to 0.01%) and 20V/µs slew rate for dynamic signals.

It operates across –40°C to +125°C with guaranteed performance: input common-mode range extends from VSS to VDD – 1.3V, PSRR reaches 85dB, CMRR hits 83dB, and THD remains ≤0.01% at 10kHz driving 2kΩ - all while consuming only 2.2mA per amplifier at 5V.

Key Specifications

Pinout & Package

The MAX4484AXK-T is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm), optimized for ultra-compact PCB layouts and thermal efficiency in high-density designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose op amp applications.

Compared with TLV9001IDBVR and LMV321IDBVR, the MAX4484AXK-T uniquely balances 7MHz bandwidth, pA input bias, no-phase-reversal reliability, and 100pF capacitive-load stability - making it the only option among the three qualified for precision zero-crossing detection and high-fidelity sensor front-ends in harsh environments.

Availability

The MAX4484AXK-T is available at Aetrix Electronics and suitable for portable communicators, electronic ignition modules, and infrared receiver designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4484AXK-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 industrial, automotive, and communications markets, emphasizing robustness, integration, and reliability.

The MAX4484AXK-T belongs to Maxim's low-cost, single-supply op amp family targeting space-constrained, wide-temperature applications - engineered specifically for zero-crossing detection, sensor signal conditioning, and portable instrumentation where rail-to-rail operation and capacitive-load stability are mandatory.

FAQ

What is the maximum capacitive load the MAX4484AXK-T can drive without oscillation?

The MAX4484AXK-T is unity-gain stable with capacitive loads up to 100pF, as verified in the manufacturer's Electrical Characteristics table and Typical Operating Characteristics (Figure 2). This specification applies across the full –40°C to +125°C temperature range and enables direct connection to ADC input capacitance or EMI filter networks without external isolation resistors - a key advantage over many competing op amps that require ≥10Ω series resistance for stability.

Does the MAX4484AXK-T support true rail-to-rail input operation?

No - the MAX4484AXK-T features ground-sensing inputs (VCM down to VSS) but its input common-mode range extends only to VDD – 1.3V, not full rail-to-rail. However, this design enables robust operation with single-ended, ground-referenced sensors while maintaining high CMRR (83dB) and avoiding input stage saturation - a deliberate trade-off that enhances DC accuracy and noise immunity in real-world sensor interfaces.

What is the typical supply current of the MAX4484AXK-T at 3.3V operation?

At VDD = +3.3V, the MAX4484AXK-T draws approximately 2.0mA typical supply current, interpolated from the datasheet's IDD specifications: 1.9mA at +2.7V and 2.2mA at +5.0V. This low quiescent current supports battery life extension in portable communicators and remote controls, especially when paired with duty-cycled signal chains.

Can the MAX4484AXK-T be used as a comparator in zero-crossing detector circuits?

Yes - the MAX4484AXK-T is explicitly recommended for single-supply zero-crossing detectors due to its no-phase-reversal behavior on overdriven inputs, rail-to-rail output swing, and fast 450ns settling time. Unlike many op amps, it avoids output latch-up when IN+ and IN– are driven beyond their common-mode range, ensuring deterministic high/low transitions critical for ignition timing and motor commutation.

Is the MAX4484AXK-T qualified for automotive applications?

Yes - the MAX4484AXK-T is specified for operation from –40°C to +125°C and is manufactured in Maxim's automotive-qualified process. While not AEC-Q200 certified as a standalone component, its temperature rating, parametric guarantees, and qualification testing align with Tier-1 supplier requirements for under-hood modules such as electronic ignition systems and crankshaft position signal conditioners.