Texas Instruments LMH7322SQX/NOPB

Overview

LMH7322SQX/NOPB from Texas Instruments is a dual high-speed comparator with RSPECL outputs, 700 ps propagation delay, 75 ps overdrive dispersion, and input common-mode range extending 200 mV below VEE - enabling ground-sensing in single-supply systems. It operates from 2.7 V to 12 V supply rails and supports LVDS-compatible output levels when VCCO = 2.5 V, making it suitable for digital receivers and high-speed sampling circuits.

For engineers reviewing the LMH7322SQX/NOPB datasheet, LMH7322SQX/NOPB pinout, LMH7322SQX/NOPB application, or LMH7322SQX/NOPB equivalent, key selection criteria include propagation delay stability across supply voltage (2.7–12 V), latch-enable timing (tsLE = 95 ps, thLE = 29 ps at 5 V), RSPECL/LVDS output compatibility, and adjustable hysteresis via external RHYS resistor.

Technical Context

The LMH7322SQX/NOPB integrates two independent comparators, each with fully differential RSPECL-compatible inputs and complementary outputs (Q/Q̄). Its input stage accepts common-mode voltages from VEE − 0.2 V to VCCI − 1.5 V and supports latch enable (LE/LĒ) with PECL-level thresholds referenced to VCCO.

Output stage uses emitter-follower topology referenced to VCCO, delivering VOH = VCCO − 1.1 V and VOL = VCCO − 1.5 V into 50 Ω loads terminated at VCCO − 2 V. Hysteresis is externally adjustable via RHYS (0–32 kΩ), yielding 25–75 mV typical hysteresis voltage.

Key Specifications

Pinout & Package

LMH7322SQX/NOPB is housed in a 24-pin WQFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per TI SNOSAU8I Rev. MARCH 2013.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH7322SQX/NOPB, LMH7324MTX/NOPB offers channel density at the cost of higher power and non-interchangeable pinout, while ADCMP572BCPZ-REEL7 delivers lower latency but sacrifices dual-channel correlation and latch-enable functionality - making LMH7322SQX/NOPB optimal for synchronized dual-edge detection in Gbps receiver front-ends.

Availability

LMH7322SQX/NOPB is available at Aetrix Electronics and suitable for digital receivers, high-speed sampling systems, and zero-crossing detectors requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LMH7322SQX/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance signal chain solutions, with decades of expertise in high-speed interface ICs.

The LMH7322SQX/NOPB belongs to TI's LMH high-speed comparator family, designed specifically for sub-nanosecond decision-making in communications infrastructure, test equipment, and real-time signal acquisition systems.

FAQ

What is the minimum supply voltage required for reliable operation of the LMH7322SQX/NOPB?

The LMH7322SQX/NOPB operates reliably from 2.7 V to 12 V on both VCCI and VCCO supplies. At 2.7 V, propagation delay increases to 713 ps (typical), overdrive dispersion remains ≤70 ps, and input common-mode range is maintained from VEE − 0.2 V to VCCI − 1.5 V. Full specification compliance is guaranteed across this entire range per TI SNOSAU8I.

Can the LMH7322SQX/NOPB drive LVDS inputs directly?

Yes - the LMH7322SQX/NOPB drives LVDS inputs directly when VCCO is set to 2.5 V. Under this condition, its RSPECL outputs deliver VOH = 1.4 V and VOL = 1.0 V (differential swing ≈ 355 mV) into 50 Ω loads terminated at VCCO − 2 V = 0.5 V, matching LVDS voltage thresholds and common-mode range requirements.

How is hysteresis adjusted on the LMH7322SQX/NOPB?

Hysteresis on the LMH7322SQX/NOPB is adjusted per channel using external resistors: connect RHYSx (Pin 6 or 19) to RHREFx (Pin 7 or 18) with a resistor from 0 Ω to 32 kΩ. This sets hysteresis voltage (VHYS+ − VHYS−) from 25 mV to 75 mV, as verified in TI's Figure 16 and Electrical Characteristics tables.

What is the function of the LE and LĒ pins on the LMH7322SQX/NOPB?

The LE and LĒ pins on the LMH7322SQX/NOPB form a differential latch-enable interface compatible with PECL logic levels. When asserted, they place the comparator outputs in transparent mode; when de-asserted, outputs retain their last state. Timing parameters include tsLE = 95 ps and thLE = 29 ps (5 V supply), enabling synchronous sampling at multi-GHz rates.

Does the LMH7322SQX/NOPB support single-supply operation?

Yes - the LMH7322SQX/NOPB supports true single-supply operation with VEE = 0 V. Its input common-mode range extends to VEE − 0.2 V = −0.2 V, allowing detection of signals referenced to ground. Output termination can be implemented using 50 Ω to VCCO − 2 V (e.g., 3 V when VCCO = 5 V) or resistive pull-down to VEE = 0 V.