Analog Devices Inc./Maxim Integrated MAX1238EVKIT

Overview

MAX1238EVKIT from Maxim Integrated is an evaluation kit designed to accelerate development and validation of the MAX1238 12-bit, 12-channel, I²C-compatible ADC operating from 4.5V to 5.5V with 4.096V internal reference, 94.4ksps throughput, ±1 LSB INL, and 16-pin QSOP package. It enables rapid prototyping of low-power sensor data acquisition in battery-constrained systems.

For engineers reviewing the MAX1238EVKIT datasheet, MAX1238EVKIT pinout, MAX1238EVKIT application, or MAX1238EVKIT equivalent, this kit provides full hardware access to the MAX1238's analog inputs (AIN0–AIN11), I²C interface (SCL/SDA), reference configuration (AIN3/REF, AIN11/REF), power sequencing, and on-board decoupling - supporting functional verification, timing analysis, and system-level integration testing.

Technical Context

The MAX1238EVKIT implements a complete signal chain around the MAX1238 ADC, including precision voltage regulation, selectable reference routing (internal 4.096V or external), configurable input multiplexer termination, and buffered I²C level-shifting for host MCU compatibility. It supports both internal clock (2.8MHz) and external clock modes, with jumper-selectable HS-mode (1.7MHz) or Fast-mode (400kHz) I²C operation.

Board-level design incorporates anti-alias filtering via RC networks on each analog input channel, track/hold acquisition optimization using 100pF bypass capacitors, and thermal-aware layout for stable 12-bit performance across –40°C to +85°C. The kit includes test points for all critical signals and a dedicated REF output monitor point.

Key Specifications

Availability

MAX1238EVKIT is available at Aetrix Electronics and suitable for handheld portable instrumentation, medical sensor interfaces, and battery-powered test equipment requiring stable component supply and fast time-to-validation.

Supply support for MAX1238EVKIT 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX1238EVKIT belongs to Maxim's precision data acquisition evaluation platform family, engineered to simplify adoption of low-power, multi-channel ADCs in space- and energy-constrained embedded systems.

FAQ

What is the primary function of the MAX1238EVKIT?

The MAX1238EVKIT is a fully assembled and tested evaluation platform for the MAX1238 12-bit, 12-channel I²C ADC. It provides immediate hardware access to all device pins, reference configuration options, and signal conditioning components - enabling engineers to validate timing, noise performance, and system integration without custom PCB design. The MAX1238EVKIT directly supports functional testing of the MAX1238 under real-world conditions.

Does the MAX1238EVKIT support both internal and external reference configurations?

Yes, the MAX1238EVKIT supports both internal and external reference modes via on-board jumpers. By default, it uses the MAX1238's internal 4.096V reference. To use an external reference, users disconnect the internal reference path and route an external 1V–VDD source to either AIN3/REF or AIN11/REF pins - verified in the MAX1238EVKIT schematic and user guide. This flexibility allows accurate calibration against system-level references.

Can the MAX1238EVKIT operate in High-Speed I²C mode (1.7MHz)?

Yes, the MAX1238EVKIT supports High-Speed I²C mode (1.7MHz) through a dedicated jumper setting and onboard level-shifting buffer. When configured for HS-mode, the board meets all timing requirements per the MAX1238 datasheet, including tHD,STA ≤160ns and tSU,DAT ≥10ns. This enables maximum throughput of 94.4ksps while maintaining robust communication with host microcontrollers.

What analog input protection features are included on the MAX1238EVKIT?

The MAX1238EVKIT includes per-channel 100pF bypass capacitors to limit bandwidth and reduce sampling error from high-impedance sources, plus series 0Ω resistors for optional external RC filtering. Input pins are routed with controlled impedance and include ESD protection diodes per MAX1238 absolute ratings (–0.3V to VDD+0.3V). No additional clamping is required for standard operation within the specified analog input range.

Is the MAX1238EVKIT compatible with the MAX1239 and other members of the MAX1236–MAX1239 family?

The MAX1238EVKIT is specifically optimized for the MAX1238 (4.5V–5.5V, 4.096V reference, 12-channel), but its hardware architecture supports functional evaluation of the MAX1239 (2.7V–3.6V, 2.048V reference) with minor supply and reference adjustments. It is not mechanically or electrically compatible with the 8-pin MAX1236/MAX1237 variants due to differing pin count, package, and I/O mapping.