Analog Devices Inc./Maxim Integrated MAX6126AASA30+T

Overview

MAX6126AASA30+T from Maxim Integrated is an ultra-high-precision, ultra-low-noise series voltage reference delivering 3.000V output with ±0.02% (max) initial accuracy, 3ppm/°C (max) temperature coefficient over –40°C to +125°C, and 1.75μV_P-P (0.1Hz–10Hz) flicker noise. It operates from 3.2V to 12.6V supply, supports ±10mA load current, and enables remote sensing via force/sense outputs - ideal for high-resolution ADCs in industrial process control systems.

For engineers reviewing the MAX6126AASA30+T datasheet, MAX6126AASA30+T pinout, MAX6126AASA30+T application, or MAX6126AASA30+T equivalent, key selection criteria include its 3.0V output stability under wide input voltage variation, low 200mV dropout at 10mA, Kelvin-sensing capability for millivolt-level accuracy, and compatibility with 0.1μF–10μF capacitive loads without oscillation.

Technical Context

The MAX6126AASA30+T employs curvature-correction circuitry and laser-trimmed thin-film resistors to achieve 3ppm/°C max tempco across automotive temperature range. Its proprietary low-noise architecture separates noise-sensitive reference core from output buffer, enabling 1.75μV_P-P (0.1Hz–10Hz) and 90nV/√Hz (1kHz, no NR cap) performance without elevated quiescent current.

It implements true 4-terminal Kelvin sensing: OUTF supplies load current while OUTS and GNDS form a high-impedance feedback path to regulate voltage at the load point, eliminating IR drop errors in PCB traces or cables. The NR pin accepts a 0.1μF capacitor to reduce wideband noise to 55nV/√Hz and improve AC PSRR.

Key Specifications

Pinout & Package

MAX6126AASA30+T is housed in an 8-pin SO package (SOIC-8), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is NR (Noise Reduction), Pin 2 is IN, Pin 3 is GND, Pin 4 is GNDS, Pins 5 & 8 are internally connected (NC), Pin 6 is OUTS, Pin 7 is OUTF.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5030IDR and ADR4530BRZ, MAX6126AASA30+T uniquely delivers 4-terminal Kelvin sensing for millivolt-level accuracy at the load, making it the only option among the three suitable for precision current sources and distributed reference architectures where trace resistance cannot be ignored.

Availability

MAX6126AASA30+T is available at Aetrix Electronics and suitable for high-resolution data acquisition, industrial process control, and automated test equipment requiring stable component supply with automotive-grade reliability and long-term calibration integrity.

Supply support for MAX6126AASA30+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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

The MAX6126 series was engineered specifically for ultra-stable, low-noise voltage referencing in high-resolution measurement systems where traditional references fail due to thermal drift, noise coupling, or load-induced errors.

FAQ

What is the maximum load current supported by the MAX6126AASA30+T?

The MAX6126AASA30+T supports ±10mA load current - sourcing up to +10mA from OUTF and sinking up to –10mA into OUTF. Load regulation is specified at ≤30μV/mA for sourcing and ≤50μV/mA for sinking, ensuring stable 3.000V output across full load range. This capability enables direct drive of ADC reference inputs, DAC bias networks, and precision current sources without external buffers.

Does the MAX6126AASA30+T require an external capacitor on the NR pin?

No, the NR pin on MAX6126AASA30+T is optional: leaving it unconnected yields 90nV/√Hz wideband noise at 1kHz, while adding a 0.1μF capacitor reduces it to 55nV/√Hz and improves AC power-supply rejection. The device remains fully functional without the capacitor, but system-level noise budgets in 24-bit data acquisition may necessitate its use to meet SNR targets.

How does the force/sense architecture of the MAX6126AASA30+T improve accuracy?

The MAX6126AASA30+T uses separate OUTF (force) and OUTS/GNDS (sense) terminals to implement true 4-wire Kelvin sensing. By routing feedback from the load point rather than the IC pin, it cancels voltage drops across PCB traces and connectors - typically 10–50mΩ - which would otherwise introduce 30–150μV errors at 10mA. This enables sub-100μV accuracy at the load, critical for calibration-grade instruments.

What is the minimum supply voltage required for the MAX6126AASA30+T to maintain regulation?

The MAX6126AASA30+T requires a minimum supply voltage of (V_OUT + 200mV) = 3.2V to maintain regulation at full 10mA load. Dropout voltage is guaranteed ≤0.2V at 5mA and ≤0.4V at 10mA. Below 3.2V, output voltage degrades nonlinearly; operation below 3.0V is not recommended as line regulation and accuracy specifications are not guaranteed.

Can the MAX6126AASA30+T be used with output capacitors outside the 0.1μF–10μF range?

No - the MAX6126AASA30+T is only guaranteed stable with output capacitance between 0.1μF and 10μF. Capacitors smaller than 0.1μF risk high-frequency oscillation due to insufficient phase margin; larger than 10μF may cause sustained ringing or slow settling. For optimal transient response, use 0.1μF ceramic in parallel with 10μF tantalum or polymer capacitor, placed as close as possible to OUTF and GND.