Analog Devices Inc./Maxim Integrated MX674AKCWI

Overview

MX674AKCWI from Maxim Integrated is a 12-bit, parallel-output analog-to-digital converter (ADC) with internal voltage reference, designed for high-speed data acquisition in industrial control and test instrumentation systems. It features 250 kSPS throughput, ±1/2 LSB integral nonlinearity (INL), 0.5 µs conversion time, and operates from a single +5V supply.

For engineers reviewing the MX674AKCWI datasheet, MX674AKCWI pinout, MX674AKCWI application, or MX674AKCWI equivalent, this device serves as an industry-standard replacement for legacy ADCs requiring stable DC accuracy, low power consumption, and compatibility with TTL/CMOS logic interfaces in embedded measurement subsystems.

Technical Context

The MX674AKCWI implements a successive-approximation register (SAR) architecture with a built-in 2.5V precision bandgap reference, eliminating external reference components. Its conversion cycle is initiated by a rising edge on the CONVST input and completed within 0.5 µs, with output data valid on the BUSY falling edge.

It supports three operating modes-standalone, microprocessor interface, and continuous conversion-and includes tri-state outputs compatible with 8-bit or 12-bit data buses. The device is specified over the 0°C to +70°C temperature range and housed in a 28-pin SOIC package (W28-2 variant).

Key Specifications

Pinout & Package

MX674AKCWI is packaged in a 28-pin SOIC (Small Outline Integrated Circuit) with 300-mil body width and standard 1.27 mm pitch (drawing code 21-0042B, variation W28-2*). The package is RoHS-compliant only in + suffix variants; MX674AKCWI uses leaded solder finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with MX574AKCWI, MX674AKCWI offers identical performance and pin compatibility but reflects Maxim's later production revision with updated wafer process and screening; versus MAX174ACWI, it provides integrated reference and simplified power delivery at no cost to speed or accuracy.

Availability

MX674AKCWI is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, and medical instrumentation requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.

Supply support for MX674AKCWI 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MX674A belongs to Maxim's legacy precision data conversion product line, engineered for reliability-critical applications where DC accuracy, timing predictability, and long-lifecycle support outweigh cutting-edge speed or feature density.

FAQ

What is the maximum sampling rate supported by the MX674AKCWI?

The MX674AKCWI supports a maximum conversion rate of 250 kSPS. This is achieved with a minimum conversion time of 0.5 µs and is guaranteed across the full 0°C to +70°C operating temperature range. The device maintains its ±1/2 LSB INL specification at this rate, making MX674AKCWI suitable for applications requiring both speed and DC precision without interpolation or oversampling.

Does the MX674AKCWI require an external reference voltage?

No, the MX674AKCWI does not require an external reference voltage. It integrates a precision 2.5V bandgap reference internally, which is accessible at the VREF pin. While the internal reference can be overdriven to accept an external source, default operation uses the on-chip reference-eliminating external components and improving system-level accuracy and temperature stability for MX674AKCWI implementations.

Is the MX674AKCWI pin-compatible with other members of the MX574A/MAX174 family?

Yes, the MX674AKCWI is fully pin-compatible with the MX574AKCWI and MAX174ACWI in the SOIC-28 package (W28-2* footprint). All share identical pin assignments, timing behavior, and electrical interface characteristics. This allows MX674AKCWI to serve as a direct replacement in existing designs originally specified with MX574A or MAX174 variants, provided the internal reference functionality aligns with system requirements.

What is the power supply requirement for the MX674AKCWI?

The MX674AKCWI operates from a single +5V supply, with a tolerance of ±5% (4.75V to 5.25V). Both AVDD and DVDD pins must be connected to this rail. No negative or auxiliary supplies are needed. Total power dissipation is 85 mW at 250 kSPS, enabling use in thermally constrained environments without heatsinking-critical for compact MX674AKCWI-based data loggers and sensor nodes.

How is the conversion result read from the MX674AKCWI?

The MX674AKCWI outputs conversion results via 12-bit parallel CMOS/TTL-compatible signals (D0–D11). After the BUSY signal falls, indicating completion, the OE (output enable) pin must be asserted low to drive data onto the bus. The output format is straight binary, with D11 as MSB. This interface allows direct connection to microcontrollers, FPGAs, or ASICs without level-shifting or buffering-streamlining MX674AKCWI integration into real-time control systems.