Analog Devices Inc./Maxim Integrated MAX6126B25+

Overview

MAX6126B25+ from Maxim Integrated is a high-precision, ultra-low-noise series voltage reference delivering 2.500V output with ±0.06% initial accuracy, 3ppm/°C max temperature coefficient (–40°C to +85°C), and 1.45μV_P-P (0.1Hz–10Hz) flicker noise - optimized for high-resolution ADC/DAC biasing in industrial process control and ATE systems.

For engineers reviewing the MAX6126B25+ datasheet, MAX6126B25+ pinout, MAX6126B25+ application, or MAX6126B25+ equivalent, key selection criteria include its force/sense output architecture, 200mV max dropout at 10mA, stability with 0.1–10μF load capacitance, and automotive-grade –40°C to +125°C operation without external resistor dependency.

Technical Context

The MAX6126B25+ employs curvature-corrected bandgap topology with laser-trimmed thin-film resistors to achieve 3ppm/°C tempco and ±0.06% initial accuracy. Its proprietary low-noise architecture separates flicker and wideband noise paths, enabling 1.45μV_P-P (0.1–10Hz) and 75nV/√Hz (1kHz, no NR cap) performance without elevated quiescent current.

It implements true Kelvin force/sense outputs (OUTF/OUTS and GNDS) to eliminate line-drop errors in precision current sources and remote-sensing applications. The NR pin supports optional 0.1μF capacitor to reduce wideband noise to 45nV/√Hz and improve AC PSRR.

Key Specifications

Pinout & Package

MAX6126B25+ is packaged in an 8-pin SO (small-outline) package with exposed pad for thermal enhancement, rated for –40°C to +125°C operation and RoHS-compliant (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4525BRZ and REF5025IDR, MAX6126B25+ uniquely combines force/sense architecture, 0.1–10μF capacitor flexibility, and NR-capable wideband noise reduction - making it optimal for compact, high-accuracy current-source and remote-sensing applications where layout constraints prevent ideal decoupling.

Availability

MAX6126B25+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, ATE equipment calibration, and precision industrial transmitters requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX6126B25+ 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 industrial, automotive, and communications applications.

The MAX6126 family targets ultra-high-accuracy voltage referencing in metrology-grade instruments, high-speed data converters, and automated test systems where noise, tempco, and long-term stability are design-critical parameters.

FAQ

What is the maximum load current supported by MAX6126B25+ while maintaining specified accuracy?

MAX6126B25+ supports ±10mA sink/source current with guaranteed load regulation of ≤25μV/mA. At full 10mA sourcing, output voltage deviation remains within ±250μV - well within its ±0.06% (±1.5mV) initial accuracy band. This makes it suitable for driving moderate-current precision circuits like op-amp bias networks or MOSFET gates in current-source topologies without external buffering.

How does the NR (Noise Reduction) pin affect MAX6126B25+ performance in real-world applications?

The NR pin on MAX6126B25+ accepts a 0.1μF capacitor to reduce wideband noise from 75nV/√Hz to 45nV/√Hz at 1kHz and improve AC power-supply rejection. In practice, this lowers integrated noise in 10Hz–100kHz bands by ~30%, directly enhancing SNR in high-speed ADC front-ends and reducing susceptibility to switching supply ripple - confirmed by typical operating curves showing 45nV/√Hz noise with CNR = 0.1μF.

Can MAX6126B25+ be used in remote-sensing configurations, and how is it implemented?

Yes, MAX6126B25+ supports true 4-wire remote sensing via dedicated OUTF (force), OUTS (sense), and GNDS (sense ground) terminals. To implement: connect OUTF to load power rail, route separate traces from OUTS and GNDS directly to the load's reference node, and short OUTF to OUTS at the load point. This cancels voltage drops across PCB traces, enabling sub-0.01% accuracy in precision current sources even with 100mΩ interconnect resistance.

What is the minimum supply voltage required for MAX6126B25+ to regulate at full 10mA load?

At 10mA load, MAX6126B25+ requires a minimum supply voltage of VOUT + dropout = 2.500V + 0.2V = 2.7V. Its dropout voltage is specified as 0.2V max at 10mA (ΔVOUT = 0.1%), allowing reliable regulation from standard 2.7V supplies - critical for low-voltage battery-operated instrumentation where headroom is constrained.

Is MAX6126B25+ qualified for automotive applications, and what temperature range does it support?

Yes, MAX6126B25+ is qualified for automotive applications with guaranteed operation over –40°C to +125°C. It meets AEC-Q100 stress-test requirements for temperature cycling, humidity, and long-term reliability. Its 20ppm/1000hr long-term stability and 3ppm/°C tempco (–40°C to +85°C) make it suitable for engine control units, battery management systems, and ADAS sensor signal conditioning where reference drift must remain below 0.02% over vehicle lifetime.