Analog Devices Inc./Maxim Integrated MAX172BCNG+

Overview

MAX172BCNG+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with internal track/hold, reference, and clock. It operates from a single +5V supply, achieves 100ksps sampling rate, and features ±1 LSB integral nonlinearity. It is used in data acquisition systems requiring medium-speed, high-resolution digitization of analog sensor signals.

For engineers reviewing the MAX172BCNG+ datasheet, MAX172BCNG+ pinout, MAX172BCNG+ application, or MAX172BCNG+ equivalent, key selection considerations include its single-supply operation, on-chip reference accuracy (±0.5% initial tolerance), differential input capability, and compatibility with microcontroller SPI-like serial interfaces.

Technical Context

The MAX172BCNG+ implements a successive-approximation register (SAR) architecture with an integrated sample-and-hold amplifier and trimmed bandgap voltage reference. Its conversion cycle is self-timed and completes in 10μs, supporting up to 100k samples per second.

It communicates via a 3-wire serial interface compatible with SPI modes 0 and 3, accepting external CS control and generating BUSY status. Input range is 0V to VREF (internal or external), with differential input configuration enabling rejection of common-mode noise.

Key Specifications

Pinout & Package

MAX172BCNG+ is housed in a 24-pin plastic DIP (dual in-line package) with 0.3-inch body width, suitable for through-hole prototyping and industrial board assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1166BCPP+, the MAX172BCNG+ offers plug-and-play operation with its fixed 2.5V reference and DIP package-ideal for lab validation, legacy system upgrades, and through-hole production where reference integration and mechanical robustness are prioritized over miniaturization or ultra-low voltage operation.

Availability

MAX172BCNG+ is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, and test equipment requiring stable component supply and long-term obsolescence management.

Supply support for MAX172BCNG+ 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, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX172BCNG+ belongs to Maxim's legacy high-accuracy SAR ADC family, engineered for applications demanding reliable, single-supply digitization without external support components.

FAQ

What is the maximum sampling rate supported by the MAX172BCNG+?

The MAX172BCNG+ supports a maximum sampling rate of 100 ksps. This is achieved with a guaranteed 10 μs conversion time per sample, independent of external timing control. The device's self-timed architecture ensures consistent throughput across temperature and supply variations, making the MAX172BCNG+ suitable for deterministic data acquisition tasks where jitter-free sampling is required.

Does the MAX172BCNG+ require an external voltage reference?

No, the MAX172BCNG+ includes a factory-trimmed 2.5V internal voltage reference with ±0.5% initial accuracy. This allows full operation without external reference components. However, the REF pin can also accept an external reference up to 5V, enabling custom full-scale adjustment. The MAX172BCNG+ maintains specified linearity and accuracy whether using internal or external reference sources.

What package type is used for the MAX172BCNG+?

The MAX172BCNG+ is packaged in a 24-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard 0.1-inch pin pitch. This through-hole package supports manual soldering, socket-based prototyping, and legacy board assembly processes. The MAX172BCNG+ DIP variant is distinct from surface-mount alternatives in the same family and is explicitly designated by the 'NG' suffix in the part number.

How does the MAX172BCNG+ interface with a microcontroller?

The MAX172BCNG+ uses a 3-wire serial interface (CS, SCLK, DOUT) compatible with SPI mode 0 and mode 3. Conversion is initiated by pulsing CS low; BUSY goes high during conversion and falls when data is ready. The microcontroller then clocks out 12 bits via SCLK, with DOUT valid on the falling edge. No additional handshaking or protocol layers are required-the MAX172BCNG+ handles all timing internally.

What is the input configuration of the MAX172BCNG+?

The MAX172BCNG+ features a fully differential analog input pair (IN+, IN−), supporting either true differential or pseudo-differential operation. When used differentially, it rejects common-mode noise up to 100 mV and provides improved PSRR. The input range is 0V to VREF (2.5V internal or externally applied), and the MAX172BCNG+ maintains ±1 LSB INL across this full range under specified operating conditions.