Analog Devices Inc./Maxim Integrated MAX183BEWG

Overview

MAX183BEWG from Maxim Integrated is a 12-bit, successive-approximation analog-to-digital converter (ADC) with 3µs conversion time, internal 4.096V reference, and parallel interface. It operates from ±5V supplies, supports unipolar/bipolar input ranges, and targets precision data acquisition in industrial control and test equipment.

For engineers reviewing the MAX183BEWG datasheet, MAX183BEWG pinout, MAX183BEWG application, or MAX183BEWG equivalent, this page provides verified technical context, package mapping to SOIC-24, confirmed operating temperature range (–40°C to +85°C), and validated alternatives for 12-bit SAR ADC replacement scenarios.

Technical Context

The MAX183BEWG implements a true 12-bit successive-approximation register (SAR) architecture with internal track/hold and reference. It accepts differential analog inputs with programmable polarity and supports both unipolar (0V to +4.096V) and bipolar (±2.048V) full-scale ranges via external logic control.

Conversion is initiated by a WR pulse and completed in 3µs, with BUSY output indicating status. Data is latched on the rising edge of RD, enabling direct connection to microprocessor buses without glue logic.

Key Specifications

Pinout & Package

MAX183BEWG is housed in a 24-pin SOIC package (drawing code W24-1*, 166 mil width), with standard JEDEC MS-013AC footprint and RoHS-compliant lead finish (non-lead-free variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX183BEWG, MAX185BEWG offers integrated clocking at minor speed cost, while ADS7816U trades dual-supply simplicity for single-supply operation and external reference dependency-neither is pin-compatible, but both serve overlapping 12-bit industrial data acquisition roles.

Availability

MAX183BEWG is available at Aetrix Electronics and suitable for industrial PLC modules, automated test equipment, motor drive current sensing, and medical instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX183BEWG 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 MAX183 belongs to Maxim's legacy precision data acquisition product line, designed specifically for high-speed, high-accuracy 12-bit SAR conversion in dual-supply industrial systems where timing determinism and reference integration are critical.

FAQ

What is the maximum sampling rate supported by the MAX183BEWG?

The MAX183BEWG achieves a 3µs conversion time, enabling a theoretical maximum sampling rate of 333kSPS. In practice, minimum cycle time depends on WR and RD strobe timing margins and bus access latency. For sustained operation, system design must allocate ≥4µs per conversion to accommodate setup/hold and data read overhead. The MAX183BEWG does not include an internal FIFO, so continuous high-rate sampling requires tight microcontroller timing control.

Does the MAX183BEWG require an external clock source?

No, the MAX183BEWG does not require an external clock. It uses an internal RC oscillator to control its successive-approximation conversion cycle. All timing is self-contained, with WR and RD serving as asynchronous control signals. This eliminates the need for external crystals or clock generators, simplifying layout and reducing bill-of-materials cost compared to clock-dependent ADCs like the MAX185BEWG, which integrates a crystal oscillator.

Can the MAX183BEWG operate from a single +5V supply?

No, the MAX183BEWG requires dual ±5V supplies (V_CC = +5V, V_EE = –5V) for proper analog core operation and reference generation. It is not specified for single-supply use. For single +5V applications, Maxim recommends the MAX1294–MAX1297 family. Attempting single-supply operation with MAX183BEWG will result in undefined behavior, missing codes, or failure to convert.

What is the function of the BUSY pin on the MAX183BEWG?

The BUSY pin on the MAX183BEWG is an active-high, open-drain output that goes high at the falling edge of WR and remains high until conversion completes. It signals that the internal SAR logic is busy and data is not yet valid on AD0–AD11. Engineers use BUSY for polling or to generate an interrupt request, ensuring RD is asserted only after conversion finishes-critical for avoiding read errors in asynchronous microprocessor interfaces.

How does the MAX183BEWG handle bipolar versus unipolar input configurations?

The MAX183BEWG selects input range via two external logic inputs (UNI/BIP and POL). When UNI/BIP = low and POL = low, it configures for 0V to +4.096V unipolar input. When UNI/BIP = high, it enables ±2.048V bipolar mode, with POL selecting sign convention. This flexibility allows one PCB layout to support multiple sensor types-e.g., thermocouples (bipolar) and RTDs (unipolar)-without hardware modification, reducing design iterations and inventory SKUs.