Analog Devices Inc./Maxim Integrated MAX1142ACAP+

Overview

The MAX1142ACAP+ from Maxim Integrated is a 14-bit, 200ksps successive-approximation analog-to-digital converter (ADC) with integrated +4.096V reference, input scaling network, track/hold, and three programmable digital outputs. It operates from a single +4.75V to +5.25V analog and digital supply, accepts ±12V bipolar or 0–+12V unipolar inputs, and delivers ≥81dB SINAD at 5kHz with 7.5mA total supply current in unipolar mode - ideal for industrial I/O modules and portable instrumentation.

For engineers reviewing the MAX1142ACAP+ datasheet, MAX1142ACAP+ pinout, MAX1142ACAP+ application, or MAX1142ACAP+ equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic and DC specifications, real-world use cases in process control and medical instruments, and two rigorously cross-checked alternative ADCs with documented functional and application-level differences.

Technical Context

The MAX1142ACAP+ implements a successive-approximation register (SAR) architecture with on-chip track/hold and internal calibration circuitry for offset, gain, and linearity correction. It supports software-configurable unipolar/bipolar input ranges and offers three clocking modes: internal clock (freeing host MCU), external clock (24- or 32-cycle conversion), and mixed-mode data transfer.

Its analog front-end includes an input scaler enabling true ±12V bipolar operation from a single +5V supply, fault protection up to ±16.5V on AIN, and a buffered +4.096V reference with ±20ppm/°C tempco. The serial interface is SPI/QSPI/MICROWIRE-compatible, with SSTRB strobe output for TMS320-family DSP synchronization and DIN/DOUT timing aligned to SCLK edges.

Key Specifications

Pinout & Package

MAX1142ACAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, footprint compatible with industry-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 MAX1142ACAP+, ADS8860IDRCT trades speed and integration for resolution, while AD7940BRMZ-REEL sacrifices input range flexibility and system-level integration to reduce unit cost - making MAX1142ACAP+ optimal for compact, ±12V-capable, self-contained DAQ subsystems.

Availability

MAX1142ACAP+ is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance per Maxim's production release.

Supply support for MAX1142ACAP+ 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, medical, and communications applications.

The MAX1142/MAX1143 product line was designed specifically for precision, single-supply data acquisition in space-constrained, noise-sensitive environments - integrating reference, scaling, calibration, and GPIO to minimize external components.

FAQ

What input voltage ranges does the MAX1142ACAP+ support?

The MAX1142ACAP+ supports software-selectable unipolar (0 to +12V) and bipolar (±12V) input ranges. This is enabled by its integrated input scaler, allowing direct digitization of industrial sensor outputs without external level-shifting circuitry. The device maintains ±1 LSB INL across both ranges, and its ±16.5V absolute maximum rating on AIN provides robust fault tolerance even during power-down.

Does the MAX1142ACAP+ require an external reference voltage?

No, the MAX1142ACAP+ includes a precision +4.096V internal reference with ±20ppm/°C tempco and buffered output at the REF pin. External reference operation is optional: it is enabled by pulling REFADJ to AVDD to disable the internal buffer, then applying 3.0V to 4.2V to REF. The internal reference is sufficient for most applications requiring ≤±1 LSB INL, eliminating BOM cost and board space.

How does the MAX1142ACAP+ handle calibration?

The MAX1142ACAP+ features on-demand software calibration that corrects 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, or ambient temperature shifts >10°C. Calibration completes in ~80,000 internal clock cycles.

What are the functions of the P0, P1, and P2 pins on the MAX1142ACAP+?

P0, P1, and P2 are user-programmable CMOS push-pull outputs controlled by bits 0–2 of the serial Control-Byte. They default to logic low after power-on reset or RST assertion and remain low-impedance during hardware/software shutdown. These outputs are commonly used to control 8-channel analog multiplexers or programmable gain amplifiers, eliminating the need for external logic or GPIO expanders in compact DAQ designs.

Can the MAX1142ACAP+ interface directly with TMS320-series DSPs?

Yes, the MAX1142ACAP+ includes a dedicated SSTRB (serial strobe) output optimized for TMS320-family DSPs. In internal clock mode, SSTRB goes low at conversion start and high at completion; in external clock mode, it pulses high for one SCLK period before MSB output. This strobe synchronizes DSP DMA transfers or interrupt-driven data capture without additional timing logic.