Analog Devices Inc./Maxim Integrated MAX14002AAP+T

Overview

MAX14002AAP+T from Maxim Integrated is a configurable, isolated 10-bit analog-to-digital converter optimized for high-voltage binary input modules (12V–300V), featuring integrated 3.75kVRMS galvanic isolation, programmable bias current (50µA–3.75mA), and fixed inrush current (49mA/48ms) for relay contact cleaning. It continuously digitizes field-side voltage, compares against dual thresholds via SPI-configurable comparator, and drives an external depletion-mode FET for noise suppression and wetting pulses.

For engineers reviewing the MAX14002AAP+T datasheet, MAX14002AAP+T pinout, MAX14002AAP+T application, or MAX14002AAP+T equivalent, this device supports robust diagnostics on the field side without external supply, delivers <150µs comparator response with filtering disabled, and enables daisy-chainable SPI communication up to 5MHz - critical for industrial digital input modules requiring safety-certified isolation and multi-range voltage detection.

Technical Context

The MAX14002AAP+T implements a SAR ADC architecture with 10ksps throughput and 0–1.25V input range referenced to AGND. Its isolated DC-DC converter powers all field-side circuitry from VDD (3.0–3.6V), enabling diagnostics even at zero input signal. The logic-side SPI interface (CS/SCLK/SDI/SDO) operates at up to 5MHz and provides access to unfiltered/filtered ADC data, threshold registers (THU/THL), and configuration bits including EXRF, EXTI, and FAST mode control.

Unlike the MAX14001, the MAX14002AAP+T fixes inrush current magnitude (49mA ±10%) and duration (48ms ±20%), and operates exclusively in FAST inrush mode - triggering based on FET current rather than ADC voltage threshold. Bias current remains fully programmable (50µA–3.75mA in 0.25mA steps) via ISET resistor and CFG register, while CMTI exceeds 50kV/µs and insulation meets UL1577 (3.75kVRMS/60s) with 5.5mm creepage/clearance in SSOP package.

Key Specifications

Pinout & Package

MAX14002AAP+T is housed in a 20-pin SSOP package (7.9mm × 7.33mm) with Group II CTI-rated material, providing 5.5mm creepage and clearance - compliant with reinforced insulation requirements for industrial safety standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated binary input conditioning applications.

Compared with MAX14001AAP+T, the MAX14002AAP+T trades configurability for reduced firmware complexity and guaranteed inrush behavior; versus ADUM7440ARQZ, it integrates full analog front-end functionality - eliminating up to 7 external components per channel in digital input module designs.

Availability

MAX14002AAP+T is available at Aetrix Electronics and suitable for distribution automation, substation automation, and industrial control digital input modules requiring stable component supply, long lifecycle support, and UL-certified isolation performance.

Supply support for MAX14002AAP+T 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 high-reliability ICs for industrial, automotive, and communications infrastructure markets.

The MAX14002AAP+T belongs to Maxim's isolated sensor interface product line, engineered specifically for high-voltage binary input conditioning in safety-critical energy infrastructure applications.

FAQ

What is the isolation rating of the MAX14002AAP+T and how is it certified?

The MAX14002AAP+T provides 3.75kVRMS isolation for 60 seconds, certified per UL1577 (File E351759). It achieves reinforced insulation with 5.5mm creepage and clearance in its 20-pin SSOP package and meets IEC 60747-5-5 requirements for VIOWM (400VRMS) and VIOTM (6300VP). This rating enables direct interfacing with 300V binary inputs in industrial and utility applications without additional isolation barriers.

Does the MAX14002AAP+T require an external power supply on the field side?

No, the MAX14002AAP+T does not require an external field-side power supply. Its integrated isolated DC-DC converter generates VDDF (2.5–3.5V) from VDD (3.0–3.6V) on the logic side, powering all field-side circuitry including the ADC, reference, and gate driver - enabling field-side diagnostics even when no input signal is present.

How does the MAX14002AAP+T differ from the MAX14001AAP+T in inrush current capability?

The MAX14002AAP+T features fixed inrush current (49mA ±10%) and duration (48ms ±20%), operating exclusively in FAST mode (triggered by FET current). In contrast, the MAX14001AAP+T supports programmable inrush magnitude (50µA–105mA) and duration (0–120ms), plus voltage-triggered mode using the INRT register - making the MAX14002AAP+T simpler to deploy where standardized wetting pulses suffice.

Can the MAX14002AAP+T operate with an external voltage reference?

Yes, the MAX14002AAP+T supports both internal (1.25V ±5%) and external voltage references. An external reference (1.15–1.35V) may be connected to REFIN in series (powered from VDDF) or shunt (powered by internal 70µA current source) configurations, selected via the CFG register's EXRF and EXTI bits - allowing higher accuracy when system-level error budgets demand tighter reference tolerance.

What is the maximum SPI clock frequency supported by the MAX14002AAP+T?

The MAX14002AAP+T supports SPI clock frequencies up to 5MHz under standard conditions. Its timing specifications guarantee tSCLK ≥ 200ns, tSCLKH/tSCLKL ≥ 80ns, and inter-access gap tIAG ≥ 920ns - enabling high-throughput register reads/writes and daisy-chained configurations across multiple devices on a shared bus without timing violations.