Analog Devices Inc./Maxim Integrated MAX6126B28+

Overview

MAX6126B28+ from Maxim Integrated is a B-grade, 2.800V ultra-low-noise, high-precision series voltage reference with ±0.10% initial accuracy, 3ppm/°C (max) temperature coefficient over –40°C to +125°C, and 1.45µV_P-P (0.1Hz–10Hz) flicker noise. It operates from 3.0V to 12.6V supply, delivers ±10mA load current, and enables remote sensing via force/sense outputs - ideal for high-resolution ADC/DAC biasing in automotive-grade test equipment.

For engineers reviewing the MAX6126B28+ datasheet, MAX6126B28+ pinout, MAX6126B28+ application, or MAX6126B28+ equivalent, this page provides verified specifications, package mapping, functional alternatives, and design-critical noise, stability, and dropout behavior confirmed for the exact 2.800V, B-grade, µMAX-packaged variant.

Technical Context

The MAX6126B28+ uses curvature-correction circuitry and laser-trimmed thin-film resistors to achieve 3ppm/°C max tempco over –40°C to +125°C and ±0.10% initial accuracy at +25°C. Its proprietary low-noise architecture delivers 1.45µV_P-P (0.1Hz–10Hz) and 75nV/√Hz (1kHz, no NR cap), reducible to 45nV/√Hz with 0.1µF on NR pin.

It implements true Kelvin force/sense outputs (OUTF/OUTS and GND/GNDS) to cancel line-drop errors, supports 0.1µF–10µF capacitive loads without oscillation, and maintains 0.06V–0.4V dropout across 5–10mA sourcing while drawing only 380µA typical quiescent current.

Key Specifications

Pinout & Package

MAX6126B28+ is supplied in an 8-pin µMAX® package (3mm × 3mm, 0.8mm height), RoHS-compliant and lead-free (+ suffix). The package supports reflow soldering up to +260°C and features exposed pad thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025IDR and ADR4525BRZ, the MAX6126B28+ uniquely delivers 2.800V output with force/sense capability and automotive-grade tempco-enabling direct replacement in 2.8V sensor interfaces and eliminating layout-dependent errors that degrade accuracy in high-precision current sources.

Availability

MAX6126B28+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, automotive sensor signal conditioning, and ATE equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6126B28+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX6126 family was engineered specifically for ultra-high-precision, ultra-low-noise voltage referencing in metrology-grade instrumentation, high-bit-depth data converters, and automotive-grade sensor interfaces.

FAQ

What is the maximum operating temperature range for the MAX6126B28+?

The MAX6126B28+ is fully specified from –40°C to +125°C, meeting AEC-Q100 Grade 0 requirements for automotive under-hood applications. Its 3ppm/°C max temperature coefficient is guaranteed across this full range, and thermal hysteresis is limited to 80ppm in the µMAX package - ensuring stable performance after repeated thermal cycling.

Does the MAX6126B28+ require an external resistor like shunt references?

No, the MAX6126B28+ is a series-mode voltage reference and does not require an external resistor. Unlike two-terminal shunt references, it draws a nearly constant 380µA supply current independent of input voltage (within 2.7V–12.6V), simplifying power design and eliminating resistor tolerance and thermal drift errors inherent in shunt configurations.

How does the force/sense architecture of the MAX6126B28+ improve accuracy?

The MAX6126B28+ uses separate OUTF (force) and OUTS (sense) pins, plus GNDS, to implement true 4-wire Kelvin sensing. By routing OUTF to the load and returning OUTS and GNDS directly to the load's reference node, voltage drops across PCB traces and connectors are excluded from regulation - preserving ±0.10% initial accuracy even with 100mΩ of series resistance.

Can the MAX6126B28+ drive a 10µF output capacitor stably?

Yes, the MAX6126B28+ is explicitly characterized and guaranteed stable with output capacitance from 0.1µF to 10µF. This allows designers to combine a 0.1µF ceramic capacitor (for high-frequency PSRR) with a 10µF tantalum or polymer capacitor (for low-frequency transient suppression) without risk of oscillation - critical for driving switching-capacitive loads in precision DAC buffers.

What is the effect of adding a capacitor to the NR pin of the MAX6126B28+?

Adding a 0.1µF capacitor between NR and GND reduces wideband noise from 75nV/√Hz to 45nV/√Hz at 1kHz and lowers 0.1Hz–10Hz flicker noise from 1.45µV_P-P to 0.9µV_P-P. However, it increases turn-on settling time from 1ms to 20ms - a trade-off acceptable in static-reference applications but requiring evaluation in fast-settling systems.