Analog Devices Inc./Maxim Integrated MX574AKD

Overview

MX574AKD from Maxim Integrated is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with integrated buried-zener voltage reference, on-chip clock, and microprocessor-compatible parallel interface. It delivers 25µs maximum conversion time, ±1/2 LSB integral nonlinearity (INL) at +25°C for K/L/T/U variants, 150mW power dissipation at ±15V supplies, and supports ±5V or ±10V bipolar and 0–+10V/0–+20V unipolar input ranges via pin strapping - used in high-accuracy industrial data acquisition systems.

For engineers reviewing the MX574AKD datasheet, MX574AKD pinout, MX574AKD application, or MX574AKD equivalent, key selection criteria include its 25µs max conversion time, internal 10V ±10ppm/°C reference, 12-bit no-missing-codes performance over temperature, and compatibility with 8-/12-/16-bit bus architectures using CS/CE/R/C control logic.

Technical Context

The MX574AKD implements a successive approximation register (SAR) architecture with a 2.5kΩ-output-impedance internal DAC and zero-crossing comparator. Its analog input structure uses external 5kΩ (10V range) or 10kΩ (20V range) resistors to set gain, and supports bipolar offset adjustment via REFOUT-to-BIPOFF connection.

Control logic accepts three-state digital outputs managed by CS, CE, and R/C inputs, with 12/8 and A0 pins selecting 8-bit vs. 12-bit conversion mode and byte addressing. STS output signals conversion completion for polling or interrupt-driven readback, with 150ns max data access time under full-control mode.

Key Specifications

Pinout & Package

MX574AKD is packaged in a 28-pin plastic DIP (dual in-line package) with 0.6-inch width, RoHS-compliant lead finish, and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard prototyping and production PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7892BRZ and ADS7800U, MX574AKD provides integrated reference, bipolar capability, and ±15V tolerance - reducing BOM count and enabling direct connection to industrial sensors without level-shifting or external references.

Availability

MX574AKD is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, motor drive feedback control, and energy metering systems requiring stable component supply and long-term obsolescence management.

Supply support for MX574AKD 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) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on integration, reliability, and ease of use.

The MX574A family belongs to Maxim's industry-standard complete ADC product line, engineered to replace multi-component discrete ADC subsystems with monolithic solutions offering reference, clock, and interface logic in one package.

FAQ

What is the maximum conversion time specification for the MX574AKD?

The MX574AKD has a maximum conversion time of 25 µs at +25°C, as specified in the Electrical Characteristics table for MX574A devices. This value applies across the full operating temperature range of −40°C to +85°C for the 'K' grade. The 25 µs limit defines the worst-case latency between initiating a conversion and valid data appearing on D0–D11, critical for real-time control loop timing budgets. MX574AKD achieves this while maintaining ±1/2 LSB INL and no missing codes.

Does the MX574AKD require external components to operate as a complete ADC?

The MX574AKD requires only decoupling capacitors and fixed resistors to operate as a complete ADC. Specifically: 4.7µF tantalum + 0.1µF ceramic capacitors on VCC and VEE referenced to AGND; 0.1µF ceramic on VL; and a 50Ω resistor between REFOUT and REFIN for unipolar operation. No external clock, reference, or timing circuitry is needed - the internal buried-zener reference and on-chip clock generator eliminate those components, reducing total solution size and cost versus discrete ADC implementations.

How does the MX574AKD support both unipolar and bipolar input ranges?

The MX574AKD supports unipolar (0–+10V, 0–+20V) and bipolar (±5V, ±10V) input ranges through pin strapping: connecting BIPOFF to REFOUT enables bipolar mode, while leaving BIPOFF open or grounded enables unipolar. The 10VIN and 20VIN pins accept the analog signal, with internal resistor networks scaled for 5kΩ (10V range) or 10kΩ (20V range) input impedance. This hardware-configured flexibility eliminates the need for external op-amp level-shifting or gain stages in mixed-signal industrial systems.

What is the purpose of the STS output pin on the MX574AKD?

The STS (Status) output pin on the MX574AKD is an active-high, open-drain signal that indicates conversion progress: it goes high at conversion start and returns low upon completion. Engineers use STS for polling or to generate a CPU interrupt, enabling efficient software synchronization without fixed delay loops. Its timing is tightly specified - e.g., STS delay from CE is 100–250 ns - ensuring deterministic response for time-critical applications like motor control feedback. STS eliminates the need for external timing components or guesswork in read sequencing.

Can the MX574AKD interface directly with an 8-bit microcontroller bus?

Yes, the MX574AKD interfaces directly with 8-bit microcontroller buses using its 12/8 and A0 pins. When 12/8 is low, the device outputs data in two 8-bit bytes: A0 low enables the high byte (D8–D11 + D4–D7), and A0 high enables the low byte (D0–D3 followed by four zeros). This left-justified format requires no external latches or software masking, allowing seamless memory-mapped I/O on 8-bit systems like Intel 8051 or Zilog Z80 derivatives - a key advantage over 12-bit ADCs requiring external byte-handling logic.