Analog Devices Inc./Maxim Integrated MAX1142AEAP

Overview

The MAX1142AEAP from Maxim Integrated is a 14-bit, 200ksps successive-approximation analog-to-digital converter (ADC) with integrated +4.096V reference, internal track/hold, input scaling network, and three user-programmable digital outputs. It operates from a single +4.75V to +5.25V analog/digital supply, supports unipolar (0 to +12V) or bipolar (±12V) input ranges, and delivers ≥81dB SINAD at 5kHz. It is used in industrial process control systems requiring high-resolution voltage monitoring under noisy conditions.

For engineers reviewing the MAX1142AEAP datasheet, MAX1142AEAP pinout, MAX1142AEAP application, or MAX1142AEAP equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, calibrated performance metrics, and two confirmed alternative parts for design flexibility and supply continuity.

Technical Context

The MAX1142AEAP uses a successive-approximation register (SAR) architecture with an integrated track/hold circuit and software-configurable input scaling to support ±12V bipolar or 0–+12V unipolar inputs on a single +5V supply. Its internal bandgap reference provides a stable 4.096V output, adjustable via REFADJ, and can be disabled for external reference use.

It supports three clock modes-internal clock, external serial clock (up to 4.8MHz), or external clock with long/short acquisition-and features on-demand calibration for offset, gain, and linearity errors. The SSTRB strobe synchronizes conversion timing with TMS320-family DSPs, while P0–P2 outputs enable direct control of external multiplexers or programmable gain amplifiers.

Key Specifications

Pinout & Package

MAX1142AEAP is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, footprint compatible with standard 20-SSOP PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Compared with ADS8325IPW and AD7940BRMZ, the MAX1142AEAP uniquely integrates ±12 V input scaling, three programmable outputs, and on-demand calibration-enabling single-chip solutions for rugged industrial DAQ without external signal conditioning or glue logic.

Availability

MAX1142AEAP is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and data-acquisition systems requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long production lifecycles.

Supply support for MAX1142AEAP 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 demanding industrial, medical, and communications applications.

The MAX1142AEAP belongs to Maxim's high-performance SAR ADC product line, engineered specifically for industrial data acquisition where input flexibility, on-chip calibration, and robust signal integrity are essential.

FAQ

What input voltage ranges does the MAX1142AEAP support?

The MAX1142AEAP supports software-selectable unipolar (0 to +12 V) or bipolar (±12 V) input ranges. This is enabled by its integrated input scaling network, which maps external voltages to the internal ADC core without external components. The MAX1142AEAP does not support the ±4.096 V or 0–+4.096 V ranges-that is specific to the MAX1143 variant. Input overvoltage protection remains active up to ±16.5 V even during shutdown.

Does the MAX1142AEAP require an external reference?

No, the MAX1142AEAP includes a factory-trimmed +4.096 V internal reference with ±20 ppm/°C temperature coefficient and 4.056 V to 4.136 V initial tolerance. An external reference can be used by disabling the internal buffer (pulling REFADJ to AVDD), but it is not required. The MAX1142AEAP reference system is fully functional out-of-the-box with proper 2.2 µF bypassing at REF and 0.22 µF at REFADJ.

How does the MAX1142AEAP handle calibration?

The MAX1142AEAP supports on-demand software calibration for offset, gain, INL, and DNL errors. Calibration is initiated by writing a Control-Byte with M1 = 0 and M0 = 1. It must be performed in the same clock mode (internal or external) used for conversions and is recommended after power-up, reset, >10°C ambient shift, or supply/reference voltage change. Calibration completes in ~80,000 internal clock cycles and updates internal correction registers automatically.

What is the function of the P0, P1, and P2 pins on the MAX1142AEAP?

P0, P1, and P2 are user-programmable CMOS push-pull digital outputs controlled by bits 0–2 of the serial Control-Byte. Their power-on default state is logic low, and they retain their last programmed value during software shutdown. These pins are designed to directly drive external 8-channel analog multiplexers or programmable gain amplifiers-eliminating the need for discrete logic or GPIO expansion in compact industrial I/O modules using the MAX1142AEAP.

Can the MAX1142AEAP interface directly with TMS320-family DSPs?

Yes, the MAX1142AEAP includes a dedicated serial strobe output (SSTRB) explicitly designed for synchronization with Texas Instruments TMS320-family digital signal processors. In internal clock mode, SSTRB goes low at conversion start and high at completion; in external clock mode, it pulses high one cycle before the MSB appears on DOUT. This eliminates timing uncertainty and simplifies firmware integration in real-time control applications using the MAX1142AEAP.