Analog Devices Inc./Maxim Integrated MAX6225BCSA

Overview

MAX6225BCSA from Maxim Integrated is a precision 2.500V buried-zener voltage reference IC with 5.0ppm/°C temperature coefficient, ±0.02% initial accuracy, and 1.5μV_P-P (0.1Hz–10Hz) output noise-designed for high-resolution ADC/DAC biasing in industrial instrumentation and ATE systems.

For engineers reviewing the MAX6225BCSA datasheet, MAX6225BCSA pinout, MAX6225BCSA application, or MAX6225BCSA equivalent, this device delivers laboratory-grade stability in an 8-pin SO package with ±15mA sourcing/sinking capability, external trim, and noise-reduction terminal-critical for 16-bit data-conversion signal chains requiring low drift and ultra-low noise.

Technical Context

The MAX6225BCSA employs buried-zener core technology with on-chip temperature compensation to achieve flat thermal response without heater power. Its output is stabilized across 8V–36V input range and remains stable under all capacitive loads (0–100μF).

It supports optional external trimming (±15mV range) and noise reduction via NR pin capacitor (1μF typical), while maintaining excellent transient response (<5μs turn-on settling to ±0.01%) and low 18mW quiescent power at +25°C.

Key Specifications

Pinout & Package

MAX6225BCSA is housed in an 8-pin SO (Small Outline) package compliant with RoHS and JEDEC MS-012. The package features gull-wing leads, 1.27mm pitch, and thermal pad-compatible footprint (land pattern 90-0096).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025IDR and ADR441BRZ, the MAX6225BCSA offers unique external trim and noise-reduction terminals within identical SO-8 footprint-enabling field calibration and application-specific noise tailoring not available in alternatives, while maintaining competitive tempco and noise performance at lower quiescent power.

Availability

MAX6225BCSA is available at Aetrix Electronics and suitable for high-resolution data acquisition, digital multimeter design, and automated test equipment requiring stable component supply with guaranteed long-term availability and traceable lot control.

Supply support for MAX6225BCSA 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-grade stability and ultra-low noise in 16+ bit data-conversion systems.

FAQ

What is the maximum input voltage rating for MAX6225BCSA?

The MAX6225BCSA supports an absolute maximum input voltage of +40V on the IN pin, with recommended operating range of 8V to 36V. Exceeding +40V may cause permanent damage. For continuous operation, VIN must remain within specified limits, and short-circuit duration to GND is limited to 5 seconds when VIN exceeds 12V. This rating ensures robustness in industrial power-supply environments where transient overvoltage events occur.

Does MAX6225BCSA require an external capacitor on the NR pin?

No, the NR pin on MAX6225BCSA is optional: it can be left open for standard operation. Adding a 1μF capacitor between NR and GND reduces wideband output noise by up to 25dB, particularly above 10Hz. The datasheet confirms larger values yield diminishing returns. This flexibility allows designers to optimize noise performance without compromising board space or BOM count unless required by system SNR targets.

Can MAX6225BCSA drive a 10kΩ load directly?

Yes, MAX6225BCSA can directly drive a 10kΩ load with negligible error: at 2.5V output, this draws only 0.25mA-well within its ±15mA sourcing/sinking capability. Load regulation is specified at ≤6ppm/mA, contributing <1.5ppm error (≈3.75μV). No buffer is needed for such light loads, simplifying circuit topology in precision sensor interfaces and calibration circuits where MAX6225BCSA serves as primary reference.

What is the purpose of pins 1, 7, and 8 on MAX6225BCSA?

Pins 1, 7, and 8 on MAX6225BCSA are labeled "I.C." (Internally Connected) and serve as internal die tie points-no external connection is permitted or required. These pins must remain unconnected on the PCB layout. Connecting them risks disrupting internal bias networks or causing latch-up. Their presence accommodates die attachment and probing during manufacturing but carries no functional role in end-user circuit operation.

How does the TRIM pin function on MAX6225BCSA?

The TRIM pin on MAX6225BCSA accepts an external voltage divider (typically 10kΩ potentiometer between OUT and GND) to adjust output voltage by ±15mV (±0.6%). This adjustment does not degrade temperature coefficient or long-term stability. TRIM is disabled when left open. It enables field calibration without rework, supporting applications like digital multimeters and ATE where unit-to-unit offset correction is required post-assembly-making MAX6225BCSA uniquely adaptable among precision references.