Analog Devices Inc./Maxim Integrated MAX6225AEPA

Overview

MAX6225AEPA from Maxim Integrated is a precision 2.500V buried-zener voltage reference with ±0.02% initial accuracy, 3.0ppm/°C max temperature coefficient over –40°C to +85°C, and 1.5µV_P-P (0.1Hz–10Hz) output noise - designed for high-resolution ADC/DAC biasing in metrology-grade instrumentation.

For engineers reviewing the MAX6225AEPA datasheet, MAX6225AEPA pinout, MAX6225AEPA application, or MAX6225AEPA equivalent, this device serves as a low-drift, low-noise reference for 16-bit+ data converters, digital voltmeters, and ATE systems where long-term stability and load regulation under ±15mA sourcing/sinking are critical selection criteria.

Technical Context

The MAX6225AEPA uses buried-zener core technology with on-chip temperature compensation to achieve near-zero curvature across its full operating range. Its internal architecture supports optional external trimming via the TRIM pin and wideband noise reduction via the NR pin capacitor.

It delivers stable 2.500V output with guaranteed line regulation ≤35ppm/V (10V–36V input), load regulation ≤7ppm/mA (sourcing), and output impedance <1Ω up to 10kHz - enabling direct drive of SAR and sigma-delta converter reference inputs without buffering.

Key Specifications

Pinout & Package

MAX6225AEPA is housed in an 8-pin plastic DIP package (0.300" width), RoHS-compliant, with through-hole mounting and industry-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR441BRZ and REF5025ID, the MAX6225AEPA offers unique combination of ±15mA drive capability, external trim, and noise-reduction pin - making it optimal for high-fidelity, field-calibratable instrumentation where flexibility and robustness are prioritized over minimal quiescent current or lowest possible noise floor.

Availability

MAX6225AEPA is available at Aetrix Electronics and suitable for high-resolution data acquisition, digital voltmeter design, and automated test equipment requiring stable component supply with full industrial temperature support.

Supply support for MAX6225AEPA 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 precision, power, and interface applications.

The MAX6225 series belongs to Maxim's precision voltage reference product line, engineered specifically for metrology, calibration, and high-end data conversion systems demanding laboratory-grade stability and noise performance.

FAQ

What is the maximum operating temperature range for MAX6225AEPA?

The MAX6225AEPA is rated for operation from –40°C to +85°C, as indicated by the "E" suffix in its part number. This extended industrial temperature range ensures reliable performance in harsh environments such as factory-floor ATE systems and outdoor instrumentation, while maintaining its specified 3.0ppm/°C max temperature coefficient and ±0.02% initial accuracy throughout the range.

Can MAX6225AEPA drive a 10kΩ load at full temperature range?

Yes - the MAX6225AEPA guarantees ±15mA sourcing and sinking capability across –40°C to +85°C. Driving a 10kΩ load at 2.5V requires only 0.25mA, well within its rated output current. Its low output impedance (<1Ω up to 10kHz) and capacitive-load tolerance (0–100µF) ensure stable operation even with complex downstream impedances and PCB parasitics.

Does MAX6225AEPA require an external capacitor on the NR pin?

No - the NR pin is optional. Leaving it open provides standard 1.5µV_P-P (0.1Hz–10Hz) noise performance. Adding a 1µF capacitor reduces wideband noise significantly, but does not affect DC accuracy, tempco, or settling time. The MAX6225AEPA remains stable with or without the NR capacitor, giving designers flexibility based on system noise budget.

How does the TRIM pin function in MAX6225AEPA?

The TRIM pin on MAX6225AEPA accepts an external voltage divider (e.g., 10kΩ pot between OUT and GND) to adjust output by ±15mV (±0.6%). This adjustment is monotonic and does not degrade temperature coefficient or long-term stability. It enables post-assembly calibration to compensate for PCB trace resistance, solder joint variance, or system-level gain errors - a key advantage over fixed-reference alternatives.

Is MAX6225AEPA compatible with ceramic output capacitors?

Yes - the MAX6225AEPA is explicitly characterized and guaranteed stable with capacitive loads from 0µF to 100µF, including X7R and C0G ceramics. Unlike many references, it requires no series isolation resistor and exhibits no peaking or ringing, even under fast load transients. This simplifies layout and improves transient response in high-speed data acquisition systems.