Analog Devices Inc./Maxim Integrated MAX40026ATA+T

Overview

MAX40026ATA+T from Maxim Integrated is a single-supply, high-speed LVDS comparator optimized for time-of-flight distance measurement, featuring 280ps typical propagation delay, 25ps typical overdrive dispersion, 1.5mV internal hysteresis, and operation from 2.7V to 3.6V across –40°C to +125°C. It delivers differential LVDS outputs compatible with FPGA and CPU inputs in LIDAR receiver chains.

For engineers reviewing the MAX40026ATA+T datasheet, MAX40026ATA+T pinout, MAX40026ATA+T application, or MAX40026ATA+T equivalent, key selection criteria include ultra-low dispersion timing performance, AEC-Q100 qualification, LVDS output compatibility, input common-mode range extending to VDD + 0.1V, and integrated hysteresis for noise-immune threshold detection in automotive and industrial sensing systems.

Technical Context

The MAX40026ATA+T implements a fully differential, current-mode LVDS output stage with 3.25mA switched current sources, enabling 247–454mV differential swing into 100Ω while maintaining 1.125–1.375V common-mode voltage independent of supply. Its input stage supports 1.5V to VDD + 0.1V common-mode range and includes internal diode/resistor protection against overvoltage.

Propagation delay skew between OUT+ and OUT- is limited to 10ps, and jitter is 2ps (Rise/Fall = 150ps, 100mV overdrive), ensuring precise edge alignment critical for sub-nanosecond time-of-flight resolution. The device uses fixed 1.5mV hysteresis to suppress noise-induced false triggering without external feedback components.

Key Specifications

Pinout & Package

The MAX40026ATA+T is housed in an 8-pin TDFN package (2mm × 2mm), side-wettable, with exposed thermal pad (EP) requiring connection to ground for optimal thermal performance and EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH7322MA/NOPB and ADCMP572BCPZ-REEL7, the MAX40026ATA+T uniquely combines AEC-Q100 qualification, integrated 1.5mV hysteresis, true LVDS output compliance, and ultra-low dispersion-making it the only option qualified for production automotive time-of-flight systems requiring deterministic nanosecond-scale timing.

Availability

MAX40026ATA+T is available at Aetrix Electronics and suitable for LIDAR distance sensing, automotive radar threshold detection, and high-speed oscilloscope triggering requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX40026ATA+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX40026ATA+T belongs to Maxim's high-speed comparator product line, engineered specifically for time-of-flight, LIDAR, and automotive radar systems requiring picosecond-level timing accuracy and robust operation in harsh environments.

FAQ

What is the guaranteed propagation delay range for MAX40026ATA+T across temperature and voltage?

The MAX40026ATA+T has a typical propagation delay of 280ps at 100mV overdrive, with min/max values specified as 270ps to 280ps under VCC = 3.3V, VCM = 2.5V, and TA = –40°C to +125°C. These limits are guaranteed by design and characterization, not production tested, and apply across the full operating temperature and supply range.

Does MAX40026ATA+T require external hysteresis components?

No, the MAX40026ATA+T includes a fixed 1.5mV internal hysteresis, eliminating the need for external positive feedback resistors. This simplifies PCB layout, improves stability, and avoids potential oscillation issues associated with discrete hysteresis networks - a key advantage over comparators like LMH7322MA/NOPB which lack integrated hysteresis.

Is MAX40026ATA+T pin-compatible with other devices in the MAX40025/MAX40026 family?

No - the MAX40026ATA+T uses an 8-pin TDFN package, while the MAX40025 variants use a 6-bump WLP. Pin assignments differ significantly: MAX40026ATA+T has dedicated GND (pins 2,3) and VCC (pins 6,7) pairs, whereas the WLP version shares functions across fewer bumps. Direct replacement requires board redesign.

What LVDS termination is required for proper operation of MAX40026ATA+T?

The MAX40026ATA+T requires a 100Ω differential termination resistor placed directly between OUT+ and OUT–. This resistor establishes the correct LVDS load condition, enabling the internal 3.25mA current sources to generate the specified 247–454mV differential output swing and 1.125–1.375V common-mode voltage. Placement close to the device minimizes stub length and reflection risk.

How does the input protection circuitry in MAX40026ATA+T function during overvoltage conditions?

The MAX40026ATA+T features internal 50Ω series resistors and back-to-back diodes between IN+ and IN–. When differential input voltage exceeds ~1.4V (2 × VF), these diodes clamp the voltage applied to the core comparator, limiting it to approximately ±0.7V. Input current under overvoltage is calculated as (VIN+ − VIN− − 1.4V)/100Ω, protecting the sensitive input stage without latch-up.