Analog Devices Inc./Maxim Integrated MX574AKEPI+

Overview

MX574AKEPI+ from Maxim Integrated is a monolithic 12-bit successive-approximation ADC with integrated buried-zener reference (10V ±2mV), on-chip clock, and BiCMOS process. It delivers 25μs max conversion time, ±1/2 LSB integral nonlinearity at +25°C, and supports ±5V/±10V bipolar or 0–+10V/0–+20V unipolar input ranges via pin strapping - used in high-accuracy industrial data acquisition systems requiring stable analog front-end performance.

For engineers reviewing the MX574AKEPI+ datasheet, MX574AKEPI+ pinout, MX574AKEPI+ application, or MX574AKEPI+ equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed analog input configuration options, and validated alternative parts for precision measurement subsystems where 12-bit resolution, low drift (10ppm/°C), and minimal external component count are critical.

Technical Context

The MX574AKEPI+ implements a 12-bit SAR architecture with internal 2.5kΩ DAC output impedance and zero-crossing comparator feedback loop. Its conversion cycle is controlled by an internal ~600kHz clock, and it supports both full-control microprocessor interfacing (via CS/CE/R/C) and stand-alone operation using R/C pulse triggering.

It features dual ground separation (AGND/DGND), precision reference routing (REFOUT→REFIN/BIPOFF), and configurable 8-/12-bit data output formats via 12/8 and A0 pins. Input settling and track-and-hold coordination are defined by STS timing - with first bit decision occurring ~2.5μs after conversion start - requiring external S/H like AD585 for >1Hz signal bandwidths.

Key Specifications

Pinout & Package

MX574AKEPI+ is supplied in a 28-pin plastic DIP (PDIP) package with 0.600" width, RoHS-compliant lead finish, and operating temperature range of –40°C to +85°C (E-grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX574AKEPI+, AD7892BRZ-1 offers higher resolution but introduces latency and external dependency, while ADS7822U reduces supply complexity at the cost of analog flexibility and reference integrity - making MX574AKEPI+ optimal for industrial systems demanding self-contained, bipolar-capable, microprocessor-compatible 12-bit conversion.

Availability

MX574AKEPI+ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, and motor drive feedback systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MX574AKEPI+ 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, automotive, and communications markets.

The MX574A series belongs to Maxim's precision data acquisition product line, designed specifically for applications requiring self-contained, low-drift, microprocessor-compatible ADCs with minimal external components in harsh industrial environments.

FAQ

What is the maximum operating temperature range for the MX574AKEPI+?

The MX574AKEPI+ is rated for operation from –40°C to +85°C (industrial E-grade). This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official Maxim datasheet (Rev 4, 6/18), where parameters like INL, DNL, and reference drift are specified across this full range for the K/E suffix variants.

Does the MX574AKEPI+ require external clock circuitry?

No, the MX574AKEPI+ does not require external clock circuitry. It integrates a complete on-chip clock generator optimized for its ~600kHz internal SAR conversion rate. The datasheet explicitly states "complete ADC with reference and clock" and confirms no external timing components are needed beyond decoupling capacitors and fixed resistors for input range configuration.

Can the MX574AKEPI+ accept ±10V analog inputs directly?

Yes, the MX574AKEPI+ can accept ±10V analog inputs directly. As documented in the Analog Input section, connecting 20VIN to the signal source and strapping BIPOFF to REFOUT configures the device for ±10V bipolar operation. Input impedance is 10kΩ, and absolute maximum ratings allow ±24V on 20VIN relative to AGND - providing safe headroom.

What is the purpose of the STS pin on the MX574AKEPI+?

The STS (Status) pin on the MX574AKEPI+ is an open-drain output that goes high during conversion and returns low when conversion completes and data is valid. It serves as a hardware handshake signal - enabling polling or interrupt-driven read operations - and is critical for synchronizing data capture without relying on fixed delay loops or timing assumptions.

Is the MX574AKEPI+ pin-compatible with other devices in the MAX174/MX574A/MX674A family?

Yes, the MX574AKEPI+ shares identical pinout and package (28-pin PDIP) with MAX174 and MX674A variants. All share the same functional block diagram, pin descriptions, and timing diagrams. Differences lie only in conversion speed (25μs for MX574A vs. 8μs for MAX174), grade-specific INL/DNL specs, and temperature range - not physical or electrical interface compatibility.