Texas Instruments LMH6739MQX/NOPB

Overview

LMH6739MQX/NOPB from Texas Instruments is a very wideband, low-distortion triple current-feedback selectable gain buffer (SGB) with −3 dB small-signal bandwidth of 750 MHz (AV = +1), 2.3 nV/√Hz input noise voltage, and 3300 V/μs slew rate. It delivers 90 mA linear output current per channel and supports gains of −1, +1, and +2 for RGB video driver, flash A/D converter driving, and wideband IF amplification.

For engineers reviewing the LMH6739MQX/NOPB datasheet, LMH6739MQX/NOPB pinout, LMH6739MQX/NOPB application, or LMH6739MQX/NOPB equivalent, this triple-channel high-speed buffer enables ultra-high-resolution video signal conditioning, wide-dynamic-range ADC/DAC interfacing, and low-noise IF amplification in space-constrained SSOP-16 layouts.

Technical Context

The LMH6739MQX/NOPB implements a current-feedback architecture with on-chip matched 450 Ω internal feedback and gain-setting resistors, enabling stable operation at AV = −1, +1, and +2 without external gain components. Its three independent amplifiers share ±5 V supply rails and feature individual disable pins (DIS A/B/C) for dynamic power management.

Each channel provides DC-coupled operation, 0.02%/0.01% differential gain/phase (RL = 150 Ω), and −85 dBc third-harmonic distortion at 20 MHz - optimized for production-quality NTSC/PAL/HDTV video and radar receiver front ends requiring exceptional signal fidelity up to 400 MHz at AV = +2.

Key Specifications

Pinout & Package

LMH6739MQX/NOPB uses a 16-pin Shrink Small-Outline Package (SSOP-16, package code DBQ0016A), 5.4 mm × 6.5 mm footprint, 1.75 mm max height, with exposed thermal pad not electrically connected. Pin 1 located at top-left corner (Q1 quadrant in tape).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-channel wideband buffer applications.

Compared with LMH6739MQX/NOPB, LMH6738MQX/NOPB offers identical per-channel performance but lacks channel integration and disable control, while THS3201DGN delivers higher bandwidth at the cost of increased power, external component dependency, and no native triple-channel synchronization.

Availability

LMH6739MQX/NOPB is available at Aetrix Electronics and suitable for RGB video driver, flash A/D converter driver, and wide dynamic range IF amplifier applications requiring stable component supply across industrial, broadcast, and defense electronics programs.

Supply support for LMH6739MQX/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 digital signal technologies with over 50 years of high-performance amplifier innovation.

The LMH6739MQX/NOPB belongs to TI's LMH high-speed amplifier product line, engineered specifically for ultra-high-resolution video systems and wide-dynamic-range signal acquisition where low distortion, wide bandwidth, and multi-channel synchronization are critical.

FAQ

What gain configurations does the LMH6739MQX/NOPB support?

The LMH6739MQX/NOPB supports three closed-loop gain settings: AV = −1, +1, and +2. These are selected by configuring the non-inverting and inverting inputs per channel as specified in Table 1 of the datasheet - for example, grounding +IN and applying signal to −IN yields AV = −1. All configurations use internal 450 Ω feedback/gain resistors, eliminating external component dependencies. The LMH6739MQX/NOPB achieves ±1.1% gain accuracy across temperature.

How does the LMH6739MQX/NOPB handle capacitive loads?

The LMH6739MQX/NOPB requires a series output resistor (ROUT) to stabilize operation with capacitive loads between 5–120 pF. Recommended ROUT values range from 17 Ω (100 pF) to 70 Ω (4.7 pF), as shown in Figure 28 of the datasheet. This external ROUT mitigates ringing and peaking while preserving >0.5 dB flatness. Without ROUT, the LMH6739MQX/NOPB may oscillate or exhibit degraded settling time under capacitive loading.

What is the thermal performance limit of the LMH6739MQX/NOPB in SSOP-16 package?

The LMH6739MQX/NOPB has a junction-to-ambient thermal resistance (θJA) of 120°C/W in the SSOP-16 package. At maximum ambient temperature (+85°C), the absolute maximum junction temperature (150°C) allows only 0.54 W total power dissipation. With 32 mA quiescent current at ±5 V (0.32 W), headroom for output stage dissipation is ~0.22 W. Forced air cooling or copper pour under the package is recommended for sustained full-output operation. The LMH6739MQX/NOPB has no thermal shutdown circuitry.

Can the LMH6739MQX/NOPB operate from a single supply?

Yes, the LMH6739MQX/NOPB supports single-supply operation. Its input common-mode range extends to ±VCC, and output swing reaches within 300 mV of either rail. For +10 V single supply, connect Pin 9 (−VS) and Pin 13 (−VS) to ground, and Pins 11/+VS and 15/+VS to +10 V. Input signals must remain within the common-mode range (±1.7 V to ±2.0 V), and output load should be referenced appropriately. DC coupling remains functional in this configuration.

What is the channel-to-channel crosstalk specification for the LMH6739MQX/NOPB?

The LMH6739MQX/NOPB exhibits −70 dBc typical crosstalk between active channels at 100 MHz (Figure 19), measured with 2 VPP output on two channels while monitoring the third. This isolation level is achieved through optimized internal routing and dual supply pin pairs (Pins 9/13 and 11/15) that minimize supply-induced coupling. Crosstalk remains below −60 dBc up to 1 GHz, making the LMH6739MQX/NOPB suitable for I/Q signal paths and multi-channel video where inter-channel interference must be minimized.