Texas Instruments LMH6703MAX/NOPB

Overview

LMH6703MAX/NOPB from Texas Instruments is a 1.2 GHz current-feedback operational amplifier with shutdown, designed for ultra-high-fidelity signal conditioning in video and data acquisition systems. It delivers −69 dBc 2nd-harmonic distortion at 20 MHz (SOT-23-6), 4500 V/µs slew rate, 2.3 nV/√Hz input voltage noise, and supports ±5 V supplies with 11 mA quiescent current. It serves as a high-speed buffer/driver for flash ADCs, RGB video lines, and wide-dynamic-range IF amplifiers.

For engineers reviewing the LMH6703MAX/NOPB datasheet, LMH6703MAX/NOPB pinout, LMH6703MAX/NOPB application, or LMH6703MAX/NOPB equivalent, key selection criteria include its current-feedback architecture requiring precise RF selection (560 Ω for SOT-23-6), shutdown timing (10 ns enable/disable), differential gain/phase performance (0.01%/0.02°), and harmonic distortion vs. frequency behavior up to 100 MHz.

Technical Context

The LMH6703MAX/NOPB employs a current-feedback topology where closed-loop bandwidth and stability are governed by feedback resistor value (560 Ω recommended for SOT-23-6), not gain setting - enabling stable operation from ±1 to ±10 V/V without external compensation. Its input stage features asymmetric bias currents (−7 µA non-inverting, −2 µA inverting) and low 30 Ω inverting-input impedance, necessitating careful RG selection in inverting configurations.

Shutdown is TTL-compatible (active-low SD pin), with 10 ns enable/disable times and <50 mVPP output glitch. The device maintains high-Z inputs/outputs when disabled, drawing only 0.9 mA total supply current, while retaining full small-signal bandwidth (1.2 GHz at AV = +2, VOUT = 0.5 VPP) and low 0.1-dB gain flatness to 150 MHz in enabled state.

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm body size) with exposed pad thermal enhancement; pinout optimized for minimal parasitic inductance in high-frequency layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed current-feedback amplifier applications.

Compared with LMH6703MAX/NOPB, LMH6702MA/NOPB trades shutdown capability for identical footprint and lower cost, while THS3201DGN offers higher bandwidth at the expense of noise and lacks shutdown - making LMH6703MAX/NOPB optimal for power-aware, video-grade, or multi-channel IF applications demanding both speed and spectral purity.

Availability

LMH6703MAX/NOPB is available at Aetrix Electronics and suitable for RGB video drivers, flash ADC front-ends, and wide-dynamic-range IF amplifiers requiring stable component supply across industrial, test & measurement, and broadcast equipment programs.

Supply support for LMH6703MAX/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 and embedded processing technologies, with decades of expertise in high-speed amplifiers and precision signal chain solutions.

The LMH6703MAX/NOPB belongs to TI's LMH™ high-speed op amp product line, engineered specifically for ultra-low-distortion, wideband signal conditioning in video, communications, and data acquisition systems demanding DC coupling and sub-degree phase fidelity.

FAQ

What is the recommended feedback resistor value for LMH6703MAX/NOPB in SOT-23-6 package?

The LMH6703MAX/NOPB datasheet specifies 560 Ω as the recommended feedback resistor (RF) for stable, flat frequency response in the SOT-23-6 package. This value is optimized to minimize peaking and ringing while maintaining 1.2 GHz bandwidth at AV = +2. Using significantly lower RF values risks oscillation due to excessive loop gain, while higher values reduce bandwidth and increase settling time. Layout parasitics must also be minimized to preserve this tuning.

Does LMH6703MAX/NOPB support single-supply operation?

The LMH6703MAX/NOPB is specified for dual-supply operation (±4 V to ±6 V) and does not support true single-supply operation with rail-to-rail input/output. Its input common-mode range is ±1.9 V, and output swing is ±3.4 V into high-Z load - insufficient to operate near either rail in a 5-V or 12-V single supply. For single-supply applications, a level-shifting bias network or alternative rail-to-rail amplifier is required.

How does the shutdown function behave on LMH6703MAX/NOPB during power-up?

On LMH6703MAX/NOPB, the shutdown pin (SD) defaults to enabled when left floating, as internal pull-up circuitry biases it above 2.0 V. During power-up, if SD is tied directly to V− or held low before supplies stabilize, unintended disable may occur until SD voltage rises above 2.0 V. TI recommends using a RC delay or supervisor circuit to ensure SD transitions high only after both ±V supplies reach regulation, preventing output glitches or latch-up.

Can LMH6703MAX/NOPB drive 50 Ω loads directly?

Yes, the LMH6703MAX/NOPB can deliver ±90 mA linear output current and is rated for RL = 100 Ω with ±3.4 V swing; driving 50 Ω loads is feasible but reduces output voltage swing to ±3.14 V and increases power dissipation. For sustained 50 Ω drive, thermal derating per RθJA = 182 °C/W (SOT-23-6) must be observed, and series isolation (e.g., 51 Ω) is recommended to prevent instability with reactive cable capacitance.

What is the impact of input bias current mismatch on LMH6703MAX/NOPB in non-inverting configuration?

The LMH6703MAX/NOPB exhibits asymmetric input bias currents: −7 µA at IN+ and −2 µA at IN−. In non-inverting configurations, this mismatch causes offset errors that scale with source impedance. For example, with a 25 Ω source on IN+, the resulting offset contribution is ~175 µV - additive to the ±7 mV VOS spec. To minimize error, keep non-inverting source impedances ≤1 kΩ and avoid high-impedance sensor interfaces without buffering.