Analog Devices Inc./Maxim Integrated MAX40025AAWT+

Overview

MAX40025AAWT+ from Maxim Integrated is a single-supply, ultra-high-speed LVDS comparator with 280ps typical propagation delay, 2.5mV internal hysteresis, and 25ps overdrive dispersion. It operates from 2.7V to 3.6V across –40°C to +125°C and is packaged in a 1.218mm × 0.818mm 6-bump wafer-level package (WLP). It serves as the timing-critical front-end comparator in time-of-flight (ToF) distance measurement circuits interfacing with transimpedance amplifiers like the MAX40658.

For engineers reviewing the MAX40025AAWT+ datasheet, MAX40025AAWT+ pinout, MAX40025AAWT+ application, or MAX40025AAWT+ equivalent, this page delivers verified electrical parameters, WLP pin mapping, ToF-specific design context, LVDS interface constraints, and validated automotive-grade alternatives for high-reliability embedded sensing systems.

Technical Context

The MAX40025AAWT+ implements a fully differential, current-mode LVDS output stage with 3.25mA switched current sources, delivering ±350mV differential swing into a 100Ω termination while maintaining 1.23V common-mode voltage independent of supply. Its input stage supports 1.5V to V_DD + 0.1V common-mode range and includes internal 50Ω series resistors plus back-to-back diodes for ±1.4V differential input protection.

Propagation delay is defined at the 50% output transition point with <25ps variation across 10mV–1V input overdrive; skew between OUT+ and OUT− is limited to 10ps. The device achieves 4Gbps maximum toggle rate and 330ps minimum pulse width, enabling precise edge detection in sub-nanosecond timing windows required for LIDAR and optical ToF systems.

Key Specifications

Pinout & Package

MAX40025AAWT+ uses a 1.218mm × 0.818mm, 6-bump wafer-level package (WLP) with bottom-side solder bumps. Land pattern follows Application Note 1891; thermal resistance θ_JA = 95.15°C/W on four-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed comparator applications.

Compared with MAX40025AAWT+, MAX40026ATA+ offers automotive qualification and larger package for reliability assurance but trades 1Gbps toggle rate and adds 0.4mm² footprint; TLV3501AIDBVR provides broader supply range and lower cost but lacks sub-ns timing fidelity and integrated hysteresis needed for precision ToF.

Availability

MAX40025AAWT+ is available at Aetrix Electronics and suitable for LIDAR time-of-flight receivers, automotive radar threshold detectors, and high-speed oscilloscope trigger circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX40025AAWT+ 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, automotive, and communications applications.

The MAX40025 family targets ultra-high-speed timing-critical sensing systems-specifically engineered to replace discrete comparator + LVDS driver combinations in optical ToF, radar, and test equipment with single-chip, low-jitter, low-dispersion solutions.

FAQ

What is the guaranteed propagation delay range for MAX40025AAWT+ across temperature and voltage?

The MAX40025AAWT+ has a typical propagation delay of 280ps at 100mV overdrive, with 270ps minimum and no maximum specified over –40°C to +125°C and 2.7V–3.6V supply. The datasheet guarantees performance via design and characterization-not 100% production testing-but confirms 270ps min under all operating conditions per Electrical Characteristics table.

Does MAX40025AAWT+ require external termination resistors for its LVDS outputs?

Yes, MAX40025AAWT+ requires a 100Ω differential termination resistor placed directly between OUT+ and OUT−. This resistor establishes the LVDS differential swing (247–454mV) and common-mode voltage (1.125–1.375V); omitting it causes undefined logic states and excessive signal reflection in high-speed routing.

Can MAX40025AAWT+ interface directly with Xilinx Kintex Ultrascale+ FPGA LVDS inputs?

Yes, MAX40025AAWT+ is fully compatible with Xilinx Kintex Ultrascale+ LVDS inputs. Its 1.23V common-mode voltage, ±350mV differential swing, and <10ps output skew meet ANSI/TIA-644-A LVDS specifications and align with Xilinx DS924 AC characteristics for 1.2V VCCO banks.

How does the 2.5mV internal hysteresis in MAX40025AAWT+ affect threshold stability in noisy optical environments?

The 2.5mV internal hysteresis in MAX40025AAWT+ raises the effective threshold by ±1.25mV during rising/falling transitions, preventing multiple output toggles caused by input noise near the decision point. This eliminates need for external hysteresis networks while maintaining <330ps minimum pulse width capability.

Is the MAX40025AAWT+ pinout compatible with MAX40025CAWT+?

Yes, MAX40025AAWT+ and MAX40025CAWT+ share identical 6-bump WLP pinout (IN+, VCC, OUT+, IN−, GND, OUT−) and mechanical footprint. The only difference is internal hysteresis: 2.5mV in MAX40025AAWT+ versus none in MAX40025CAWT+. No PCB redesign is needed when swapping between them.