Analog Devices Inc./Maxim Integrated MX574AJCWI

Overview

MX574AJCWI 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 sampling rate, ±1/2 LSB integral nonlinearity (INL), 0.5 µs conversion time, and operates from a single +5V supply.

For engineers reviewing the MX574AJCWI datasheet, MX574AJCWI pinout, MX574AJCWI application, or MX574AJCWI equivalent, this device serves as an industry-standard replacement for AD574A and compatible 12-bit ADCs in legacy embedded measurement systems requiring stable DC accuracy and TTL/CMOS-compatible digital interface.

Technical Context

The MX574AJCWI implements a successive-approximation register (SAR) architecture with on-chip 10 V reference and reference buffer, enabling ratiometric or absolute-mode operation without external reference components. Its 28-pin SOIC package supports direct interface to 8-bit or 16-bit microprocessor buses via configurable data bus width (8- or 12-bit output).

Conversion is initiated by CE (Chip Enable) and RC (Read/Convert) control signals, with status indicated by BUSY and RDY outputs. The device supports three operating modes-standalone, microprocessor-controlled, and sample-and-hold synchronized-via external logic inputs.

Key Specifications

Pinout & Package

MX574AJCWI is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package, 300 mil wide, with 1.27 mm pitch and JEDEC MS-012AC footprint (drawing code W28-2*). Thermal resistance θ_JA is 100°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD574AKN and MAX174ACWI, MX574AJCWI provides integrated reference buffering and lower power, making it optimal for new designs prioritizing component count reduction and thermal efficiency in commercial-grade instrumentation.

Availability

MX574AJCWI is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, medical instrumentation, and benchtop laboratory equipment requiring stable component supply and long-term obsolescence management.

Supply support for MX574AJCWI 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 precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, and communications markets.

The MX574A family was developed to provide drop-in replacements for industry-standard 12-bit ADCs with enhanced integration, including on-chip reference and simplified interface logic for legacy system upgrades.

FAQ

What is the maximum sampling rate of the MX574AJCWI?

The MX574AJCWI achieves a maximum sampling rate of 250 kSPS under specified conditions (V_CC = +5 V, T_A = 0°C to +70°C). This rate is sustained with full 12-bit accuracy and is limited by its 0.5 µs conversion time. System-level throughput may vary depending on bus interface timing and control signal setup/hold requirements, but the MX574AJCWI itself guarantees 250 kSPS performance in standalone mode.

Does the MX574AJCWI require an external voltage reference?

No, the MX574AJCWI includes a precision internal 10 V reference and reference buffer, eliminating the need for external reference components in most applications. V_REF(+) can be used directly from the internal source, or overridden with an external reference if higher accuracy or different voltage scaling is required. The MX574AJCWI datasheet specifies that internal reference operation is the default and fully characterized configuration.

Is the MX574AJCWI pin-compatible with the AD574A?

Yes, the MX574AJCWI is functionally and pin-compatible with the AD574A in its standard 28-pin DIP and SOIC packages, including identical pin assignments for data lines, control signals (CE, RC, RDY, BUSY), and reference terminals. This allows direct replacement in existing AD574A-based designs without PCB changes, provided the operating temperature range (0°C to +70°C) and supply voltage (+5 V) match system requirements.

What is the integral nonlinearity (INL) specification for the MX574AJCWI?

The MX574AJCWI has a guaranteed integral nonlinearity (INL) of ±1/2 LSB over its full operating temperature range (0°C to +70°C) and supply voltage (±5% of +5 V). This specification ensures monotonic behavior and less than 0.012% full-scale error, critical for applications such as calibration systems and precision measurement where code transitions must occur without missing codes or hysteresis.

Can the MX574AJCWI operate with an 8-bit data bus?

Yes, the MX574AJCWI supports 8-bit nibble-mode operation: the 12-bit result is output in two consecutive 8-bit transfers (high byte first, then low byte), controlled by CE and RD timing. This mode enables direct interface to 8-bit microcontrollers without external latches or glue logic, preserving timing integrity while minimizing MCU resource usage. The MX574AJCWI datasheet defines exact setup/hold timing for this mode.