Analog Devices Inc./Maxim Integrated MAX189CCPA+

Overview

MAX189CCPA+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) operating from a single +5V supply, accepting 0–5V unipolar analog input, featuring internal track/hold, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It requires an external reference voltage (2.5V to VDD), supports industrial temperature range (–40°C to +85°C), and is packaged in 8-pin PDIP.

For engineers reviewing the MAX189CCPA+ datasheet, MAX189CCPA+ pinout, MAX189CCPA+ application, or MAX189CCPA+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply-chain support details for embedded sensor and isolated data acquisition systems.

Technical Context

The MAX189CCPA+ implements a 12-bit SAR architecture with integrated track/hold circuitry, acquiring input signals in ≤1.5µs and completing conversion in 5.5–8.5 clock cycles (t_CONV). Its serial interface operates at up to 5MHz SCLK, outputs MSB-first unipolar data preceded by an EOC high bit, and requires no external hardware to interface with microcontrollers or DSPs.

It relies on an externally supplied reference (2.5V to VDD) applied to the REF pin, with specified accuracy requiring ≤10Ω source impedance and ≤350µA DC load current. Shutdown mode reduces supply current to ≤10µA, and wake-up time depends on external reference capacitor discharge-no internal reference buffer is present, distinguishing it from the MAX187.

Key Specifications

Pinout & Package

MAX189CCPA+ is housed in an 8-pin plastic dual in-line package (PDIP), with pins arranged in standard DIP layout. All pins are electrically defined per Maxim's official pin description; no NC pins are internally connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11131AUT+T, the MAX189CCPA+ uniquely supports external reference voltages from 2.5V to VDD in a +5V system, retains legacy SPI/QSPI/MICROWIRE interoperability, and delivers verified 75ksps throughput with ≤10µA shutdown-making it optimal for industrial +5V sensor interfaces requiring reference adaptability and long-term supply stability.

Availability

MAX189CCPA+ is available at Aetrix Electronics and suitable for portable data logging, isolated data acquisition, and high-accuracy process control requiring stable component supply across extended product lifecycles.

Supply support for MAX189CCPA+ 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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX187/MAX189 family was designed specifically for low-power, space-constrained, +5V-based data acquisition systems requiring simple serial interfacing and robust DC/AC performance-targeting remote sensing, battery-operated instrumentation, and isolated measurement front-ends.

FAQ

What is the reference voltage requirement for MAX189CCPA+?

The MAX189CCPA+ requires an external reference voltage applied to the REF pin, ranging from +2.5V to VDD (i.e., +2.5V to +5.25V). For full 12-bit accuracy, the reference must provide ≤350µA load current with ≤10Ω output impedance. A 4.096V reference is commonly used to achieve 1mV/LSB scaling, and a 0.1µF ceramic bypass capacitor is mandatory at the REF pin.

Does MAX189CCPA+ include an internal reference?

No, the MAX189CCPA+ does not include an internal reference. Unlike the MAX187, it is designed exclusively for external reference operation. The SHDN pin has no effect on reference enablement in the MAX189CCPA+, and pulling SHDN high or leaving it floating does not activate any on-chip reference circuitry-the REF pin is strictly an input.

What is the maximum SCLK frequency supported by MAX189CCPA+?

The MAX189CCPA+ supports SCLK frequencies up to 5MHz, with minimum high and low pulse widths of 100ns each. The clock duty cycle is unrestricted as long as both phases meet the 100ns minimum. Data is sampled on the rising edge of SCLK and changes on the falling edge, enabling reliable interfacing with standard microcontroller SPI peripherals configured for CPOL=0, CPHA=0.

How does shutdown mode work on MAX189CCPA+?

Driving the SHDN pin low places the MAX189CCPA+ into shutdown mode, reducing supply current to ≤10µA. The device remains fully functional upon SHDN deassertion, with no wake-up delay beyond normal acquisition time (t_ACQ = 1.5µs). Since the MAX189CCPA+ uses an external reference, no reference stabilization delay is incurred-unlike the MAX187, which requires ~2µs after SHDN release to re-enable its internal bandgap.

Can MAX189CCPA+ interface directly with an Arduino or STM32 MCU?

Yes, the MAX189CCPA+ can interface directly with Arduino and STM32 MCUs using their hardware SPI peripherals. Configure the MCU as master, CPOL=0 and CPHA=0, connect CS, SCLK, and DOUT, and use a GPIO for chip select. Each conversion yields 13 bits (1 EOC + 12 data bits) shifted MSB-first; the MCU reads DOUT on SCLK rising edge, requiring ≥13 clock cycles per sample.