Analog Devices Inc./Maxim Integrated MAX6126A28+T

Overview

MAX6126A28+T from Maxim Integrated is an ultra-high-precision, ultra-low-noise series voltage reference delivering 2.800V output with ±0.06% initial accuracy, 3ppm/°C max temperature coefficient (−40°C to +125°C), and 1.45μV_P-P (0.1Hz–10Hz) flicker noise. It operates from 3.0V to 12.6V supply, supports ±10mA load current, and is used in high-resolution ADCs, precision current sources, and industrial process control systems requiring stable, low-drift references.

For engineers reviewing the MAX6126A28+T datasheet, MAX6126A28+T pinout, MAX6126A28+T application, or MAX6126A28+T equivalent, key selection criteria include its force/sense outputs for remote sensing, 200mV max dropout at 10mA, stability with 0.1–10μF capacitive loads, and automotive-grade −40°C to +125°C operation without external resistors or trimming.

Technical Context

The MAX6126A28+T employs curvature-correction circuitry and laser-trimmed thin-film resistors to achieve 3ppm/°C max tempco over −40°C to +125°C. Its proprietary low-noise architecture separates wideband (75nV/√Hz @ 1kHz, no NR cap) and flicker noise components, enabling noise reduction to 45nV/√Hz with a 0.1μF capacitor on the NR pin.

It implements true Kelvin force/sense topology: OUTF supplies load current while OUTS and GNDS form a high-impedance feedback path to cancel IR drops in power and ground lines. Dropout is defined as VIN–VOUT where VOUT deviates by 0.1% - specified at 0.06–0.2V (5mA) and 0.12–0.4V (10mA).

Key Specifications

Pinout & Package

MAX6126A28+T is housed in an 8-pin μMAX® package (2.1mm × 2.1mm, 0.8mm height), optimized for space-constrained automotive and portable instrumentation PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with ADR4525BRZ and REF5025IDR, the MAX6126A28+T uniquely combines 2.800V output, integrated force/sense architecture, and user-adjustable noise performance - making it optimal for remote-sensing current sources and high-accuracy data loggers where line-drop cancellation and low flicker noise are mandatory.

Availability

MAX6126A28+T is available at Aetrix Electronics and suitable for high-resolution A/D converters, precision current sources, and industrial process control systems requiring stable component supply across automotive and extended temperature ranges.

Supply support for MAX6126A28+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 precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications.

The MAX6126 product line delivers ultra-low-noise, high-accuracy series voltage references with force/sense outputs and noise-reduction capability - engineered specifically for metrology-grade instrumentation and high-end data acquisition systems.

FAQ

What is the maximum load current the MAX6126A28+T can source or sink?

The MAX6126A28+T supports ±10mA load current - sourcing up to +10mA from OUTF and sinking up to −10mA into OUTF. Load regulation is guaranteed ≤28μV/mA in both directions, ensuring <±280μV output deviation across full load range. This capability enables direct drive of op-amp inputs, ADC references, and precision current-source transistors without external buffers.

How does the NR pin on the MAX6126A28+T reduce noise, and what capacitor value is recommended?

The NR pin on the MAX6126A28+T accepts a 0.1μF capacitor to reduce wideband noise from 75nV/√Hz to 45nV/√Hz at 1kHz; it also lowers 0.1Hz–10Hz flicker noise to 0.9μV_P-P. A 100μF capacitor further reduces flicker noise to 0.6μV_P-P. The capacitor must be placed directly between NR and GND; leaving NR unconnected retains baseline noise performance. This feature provides design flexibility without altering quiescent current.

Can the MAX6126A28+T operate from a 3.0V supply, and what is its minimum dropout voltage?

Yes, the MAX6126A28+T operates from a minimum supply of 3.0V (VIN ≥ VOUT + 200mV). Its dropout voltage is 0.06–0.2V at 5mA load and 0.12–0.4V at 10mA load - defined as the VIN–VOUT differential causing 0.1% output deviation. This allows reliable operation from single Li-ion cells (3.0–3.6V) or 3.3V rails with margin, unlike shunt references requiring higher headroom.

What is the purpose of the separate OUTF, OUTS, and GNDS pins on the MAX6126A28+T?

The OUTF, OUTS, and GNDS pins implement a 4-wire Kelvin sensing architecture: OUTF delivers load current, while OUTS and GNDS form a high-impedance feedback path connected directly at the load terminals. This cancels voltage drops across PCB traces and connectors - critical for maintaining ±0.06% accuracy in remote current sources or distributed sensor systems where wiring resistance introduces significant error.

Is the MAX6126A28+T qualified for automotive applications, and what temperature range does it support?

Yes, the MAX6126A28+T is qualified for automotive use with guaranteed operation from −40°C to +125°C. It meets AEC-Q100 stress testing requirements for temperature cycling, humidity, and lifetime reliability. Its 3ppm/°C max tempco and 100ppm/1000hr long-term stability ensure consistent performance in engine control units, ADAS sensor modules, and infotainment systems exposed to extreme thermal environments.