Analog Devices Inc./Maxim Integrated MX7574JN

Overview

MX7574JN from Maxim Integrated is an 8-bit, successive-approximation analog-to-digital converter (ADC) with CMOS architecture and microprocessor-compatible parallel interface. It features 4 µs conversion time, ±0.5 LSB integral nonlinearity, and operates from a single +5V supply. It is used in data acquisition systems requiring fast, low-power digitization of analog sensor signals.

For engineers reviewing the MX7574JN datasheet, MX7574JN pinout, MX7574JN application, or MX7574JN equivalent, this page provides verified technical context, package mapping to PDIP-18, key timing and accuracy specs, and two validated alternative parts for industrial and test equipment designs.

Technical Context

The MX7574JN implements a successive-approximation register (SAR) architecture with internal track-and-hold, enabling single-supply operation and direct interfacing to 8-bit microprocessors via its 8-bit parallel output bus. Conversion is initiated by WR pulse and completed within 4 µs, with BUSY signal indicating status.

It supports differential analog input (VIN+ and VIN−), reference voltage flexibility (internal 2.5V or external up to +5V), and TTL/CMOS-compatible digital I/O. No external clock is required - internal oscillator drives conversion cycle.

Key Specifications

Pinout & Package

MX7574JN is housed in an 18-pin plastic dual in-line package (PDIP), footprint code P18-5*, with 0.3-inch body width and 0.1-inch pin pitch. Pin layout follows industry-standard DIP-18 mechanical dimensions per drawing 21-0043D.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with AD7820KN and MAX195BCPP, the MX7574JN offers balanced speed, integrated reference, and parallel interface-making it optimal for cost-sensitive, space-constrained 8-bit microprocessor-based systems where minimal firmware and layout changes are required.

Availability

MX7574JN is available at Aetrix Electronics and suitable for industrial data acquisition, embedded sensor monitoring, and test equipment front-end applications requiring stable component supply and long-term sourcing continuity.

Supply support for MX7574JN 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 MX7574JN belongs to Maxim's legacy precision data converter family, designed specifically for microprocessor-centric systems needing fast, low-cost, single-supply 8-bit digitization without external timing or reference components.

FAQ

What is the maximum sampling rate supported by the MX7574JN?

The MX7574JN achieves a 4 µs conversion time, enabling a theoretical maximum sampling rate of 250 kSPS. However, system-level timing-including WR setup/hold, BUSY assertion delay, and RD access time-typically limits practical throughput to ~200 kSPS in microprocessor interfaces. The MX7574JN does not require an external clock, relying instead on its internal oscillator for timing control.

Does the MX7574JN include an internal voltage reference?

Yes, the MX7574JN integrates a precision 2.5V bandgap reference, selectable via the REFSEL pin. When enabled, this reference sets the full-scale input range for both single-ended and differential modes. Alternatively, an external reference between 1.0V and 5.0V may be applied to the VREF pin, allowing flexible scaling. The MX7574JN's internal reference contributes to its self-contained, minimal-external-component design.

Is the MX7574JN RoHS-compliant?

The base MX7574JN variant is not RoHS/lead-free; it uses leaded solder in the PDIP package. However, the pin-compatible MX7574JN+ version is RoHS-compliant and lead-free, using pkgcode/variation P18+5*. Both share identical electrical specifications and timing behavior. Customers transitioning to RoHS requirements should specify MX7574JN+ and verify board reflow profile compatibility.

Can the MX7574JN operate with a 3.3V microprocessor interface?

The MX7574JN's digital I/O (WR, RD, DB0–DB7, BUSY) is TTL/CMOS-compatible and specified for VDD = +5V, but it accepts input voltages down to 0.8V (VIH min = 2.0V, VIL max = 0.8V). Direct connection to 3.3V logic is possible if the microprocessor's VOH exceeds 2.0V and VOL stays below 0.8V - verified in many 3.3V systems. For guaranteed interoperability, level-shifting is recommended. The MX7574JN itself must be powered from +5V.

What is the purpose of the BUSY signal on the MX7574JN?

The BUSY signal is an active-high, open-drain output that goes high at the start of conversion and returns low upon completion. It allows microprocessors to poll conversion status without fixed delays, enabling efficient resource use in interrupt-driven or multitasking firmware. Since BUSY is asynchronous and independent of WR/RD timing, it supports robust handshaking in variable-load systems. The MX7574JN's BUSY behavior is fully documented in its timing diagram and requires an external pull-up resistor.