Analog Devices Inc./Maxim Integrated MAX11905EVKIT#

Overview

MAX11905EVKIT# from Maxim Integrated is an evaluation kit for the MAX11905 - a 20-bit, 1.6Msps, fully differential SAR ADC with integrated reference buffers, ±6 LSB INL, 98.3dB SNR, and SPI-compatible interface. It supports unipolar differential ±VREF input range (2.5V–3.6V), operates from -40°C to +85°C, and targets high-precision data acquisition in test equipment and medical instrumentation.

For engineers reviewing the MAX11905EVKIT# datasheet, MAX11905EVKIT# pinout, MAX11905EVKIT# application, or MAX11905EVKIT# equivalent, this page provides verified hardware configuration details, supported ADC interface modes, on-board signal conditioning, power supply architecture, and direct compatibility with the MAX11905 IC's 20-pin TQFN package and timing requirements.

Technical Context

The MAX11905EVKIT# implements a complete signal chain for the MAX11905 ADC, including precision low-noise analog front-end filtering, configurable reference routing (internal buffer or external reference), and robust digital interface isolation. It supports both single-ended and differential analog source configurations via jumper-selectable input networks.

Board-level design incorporates dedicated AGND/DGND/REFGND partitioning, multi-tier decoupling (10µF || 0.1µF per supply rail), and impedance-controlled SPI traces aligned to MAX11905 timing specs (t1 = 4ns setup, t4 = 2.5ns hold). The kit enables full characterization of dynamic performance metrics including SFDR (125dB), THD (-123dB at 10kHz), and aperture jitter (3psRMS).

Key Specifications

Availability

MAX11905EVKIT# is available at Aetrix Electronics and suitable for test and measurement systems, automatic test equipment, and medical instrumentation requiring stable component supply and rapid prototyping validation.

Supply support for MAX11905EVKIT# 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, mixed-signal, and RF ICs for precision sensing, power management, and secure connectivity applications.

The MAX11905EVKIT# belongs to Maxim's precision data acquisition evaluation platform family, engineered to accelerate development of high-resolution, low-power ADC-based systems in demanding industrial and medical environments.

FAQ

What is the primary function of the MAX11905EVKIT#?

The MAX11905EVKIT# is a fully assembled and tested evaluation platform for the MAX11905 20-bit, 1.6Msps SAR ADC. It provides immediate hardware access to all ADC pins, configurable analog input paths, reference options (internal buffer or external), and SPI interface signals - enabling rapid validation of signal integrity, timing compliance, and dynamic performance without custom PCB design. The MAX11905EVKIT# directly supports characterization of the MAX11905 under real-world conditions.

Does the MAX11905EVKIT# support external reference voltage sources?

Yes, the MAX11905EVKIT# supports both internal and external reference configurations. When using the internal reference buffer, REFIN is driven by a 3.3V source and REFVDD is supplied at 3.3V–3.6V. For external reference operation, the kit allows connection of a precision 2.5V–3.6V reference to the REFIN pin while disabling the internal buffer via appropriate jumper settings - maintaining full compatibility with the MAX11905's specified reference input range and load current (600µA max).

What power supply requirements does the MAX11905EVKIT# impose?

The MAX11905EVKIT# requires four independent DC supplies: 1.8V for AVDD and DVDD, 1.5V–3.6V for OVDD (digital interface), and 3.3V for REFVDD. Each rail is decoupled with 10µF + 0.1µF capacitors as specified in the MAX11905 datasheet. The board includes test points and header pins for all supplies and grounds (AGND, DGND, REFGND), ensuring proper separation and low-noise operation essential for achieving the MAX11905's 98.3dB SNR and ±6 LSB INL.

Can the MAX11905EVKIT# be used to evaluate single-ended input signals?

Yes, the MAX11905EVKIT# supports single-ended unipolar and bipolar input configurations via onboard jumpers and resistor networks that convert single-ended sources to the MAX11905's required differential input format. The kit's schematic implements the exact topology shown in the MAX11905 datasheet Figures 13 (unipolar) and 14 (bipolar), preserving common-mode centering at VREF/2 ±100mV and maintaining full 20-bit no-missing-codes performance when properly configured.

Is the MAX11905EVKIT# compatible with standard SPI host controllers?

Yes, the MAX11905EVKIT# implements a standard 4-wire SPI interface (SCLK, DIN, DOUT, CNVST) fully compliant with SPI, QSPI™, and MICROWIRE® protocols. It meets all MAX11905 timing requirements including t1 = 4ns (DIN setup), t4 = 2.5ns (DOUT hold), and supports up to 100MHz SCLK. The board includes level-shiftable OVDD (1.5V–3.6V) to match host logic levels, enabling direct connection to FPGAs, microcontrollers, and digital signal processors without additional interface circuitry.