Analog Devices Inc. LTC6754HUD#TRPBF

Overview

LTC6754HUD#TRPBF from Analog Devices (formerly Linear Technology) is a high-speed rail-to-rail input comparator with LVDS-compatible differential outputs, designed for timing-critical signal conditioning in high-frequency data acquisition and clock/data recovery systems. It delivers 1.8ns typical propagation delay, 1ns overdrive dispersion (10mV–125mV), 890Mbps toggle rate, and operates from 2.4V to 5.25V supplies. Its QFN-12 package supports separate VCCI/VCCO supplies for input-output isolation and logic-level translation.

For engineers reviewing the LTC6754HUD#TRPBF datasheet, LTC6754HUD#TRPBF pinout, LTC6754HUD#TRPBF application, or LTC6754HUD#TRPBF equivalent, key selection criteria include sub-2ns propagation delay stability across supply and temperature, adjustable hysteresis (0–40mV), output latching capability, shutdown wake-up time of 120ns, and guaranteed operation from –40°C to +125°C.

Technical Context

The LTC6754HUD#TRPBF implements a dual-stage architecture: a rail-to-rail input stage using complementary PNP/NPN pairs (active across VEE –0.2V to VCCI +0.1V), followed by a gain stage and an LVDS output driver with common-mode feedback maintaining VOCM ≈ 1.26V. Input hysteresis is programmable via the LE/HYST pin using voltage, current, or resistor-to-VEE configuration.

Its QFN-12 package enables independent VCCI (input supply) and VCCO (output supply) rails-allowing input common-mode extension beyond VCCI while minimizing output-stage power consumption. Shutdown mode reduces total supply current to 1.05mA (typ), with 110ns shutdown time and 120ns wake-up latency under 100mV overdrive.

Key Specifications

Pinout & Package

Package: 12-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 13 = VEE, must be soldered to PCB). θJA = 68°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH7322MA/NOPB and ADCMP605BCPZ-R2, the LTC6754HUD#TRPBF uniquely combines sub-2ns delay, user-adjustable hysteresis (0–40mV), output latching, and independent input/output supplies - making it the only option qualified for simultaneous precision timing, noise immunity, and power-domain isolation in demanding CDR and TDR designs.

Availability

LTC6754HUD#TRPBF is available at Aetrix Electronics and suitable for clock and data recovery, high-speed line receiver, and time-domain reflectometry applications requiring stable component supply across automotive under-hood, industrial automation, and telecom infrastructure programs.

Supply support for LTC6754HUD#TRPBF 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

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC6754 belongs to Linear's high-speed comparator product line, engineered specifically for nanosecond-precision timing in datacom, test equipment, and instrumentation where jitter, dispersion, and supply-domain isolation are design-critical.

FAQ

What is the operating temperature range for the LTC6754HUD#TRPBF?

The LTC6754HUD#TRPBF is rated for operation from –40°C to +125°C, matching the H-grade specification defined in the datasheet. This extended range supports deployment in automotive engine compartments, industrial PLCs, and base station RF modules where ambient temperatures exceed standard commercial limits. The device maintains full parametric performance-including 1.8ns propagation delay and 1ns overdrive dispersion-across this entire range.

Does the LTC6754HUD#TRPBF require external hysteresis resistors?

No, the LTC6754HUD#TRPBF does not require external hysteresis resistors. Its LE/HYST pin supports three configuration modes: floating (4.5mV default hysteresis), voltage-controlled (0–40mV), or resistor-to-VEE (adjustable from 0mV to 40mV). This eliminates external components while enabling precise hysteresis tuning-critical for noise-immune threshold detection in high-speed data acquisition systems using the LTC6754HUD#TRPBF.

Can the LTC6754HUD#TRPBF drive standard LVDS loads without external termination?

Yes, the LTC6754HUD#TRPBF is designed to drive standard 100Ω differential LVDS loads directly. Its output stage delivers 362mV typical differential voltage (VOD) into a 100Ω load between Q and Q pins, with a 1.26V common-mode voltage (VOCM)-fully compliant with ANSI/TIA/EIA-644 LVDS specifications. No external termination resistors are needed when using the recommended 100Ω load, simplifying layout for high-speed board designs using the LTC6754HUD#TRPBF.

How does the separate VCCI and VCCO supply architecture benefit system design?

The separate VCCI (input) and VCCO (output) supplies in the LTC6754HUD#TRPBF provide galvanic isolation between sensitive analog input circuitry and noisy digital output loads. This prevents switching noise from the LVDS driver from coupling back into the input stage-improving PSRR and CMRR. It also enables supply-level translation: e.g., 5.25V VCCI extends input common-mode range beyond 5V, while 2.4V VCCO minimizes output power, a key advantage in thermally constrained systems using the LTC6754HUD#TRPBF.

What is the wake-up time from shutdown for the LTC6754HUD#TRPBF?

The LTC6754HUD#TRPBF wakes up from shutdown in 120ns (typical) with output valid, measured under 100mV input overdrive. This fast wake-up enables burst-mode operation in power-sensitive applications like portable test gear or battery-powered TDR instruments. During shutdown, total supply current drops to 1.05mA (typ), reducing system power by >92% versus active mode (13.4mA), while preserving full functionality upon reactivation of the LTC6754HUD#TRPBF.