Texas Instruments LMH6704MA/NOPB

Overview

LMH6704MA/NOPB from Texas Instruments is a 650 MHz current-feedback selectable gain buffer (SGB) with user-configurable gains of +1, +2, and −1 V/V, ±90 mA output drive, 3000 V/µs slew rate, and 2.3 nV/√Hz input voltage noise. It serves as a high-fidelity video driver or ADC/DAC interface in HDTV, RGB, and high-speed multiplexer systems.

For engineers reviewing the LMH6704MA/NOPB datasheet, LMH6704MA/NOPB pinout, LMH6704MA/NOPB application, or LMH6704MA/NOPB equivalent, key selection criteria include small-signal bandwidth at AV = +1 (650 MHz), differential gain/phase accuracy (0.02%/0.02°), disable timing (10 ns enable/disable), output current capability (±90 mA), and SOIC-8 package thermal resistance (θJA = 160°C/W).

Technical Context

The LMH6704MA/NOPB uses a proprietary current-feedback architecture with integrated 465 Ω RF and RG resistors, enabling stable gain configuration without external feedback networks. Its disable function places output in high-Z state with <0.25 mA quiescent current while preserving input impedance.

It operates on split supplies (±4 V to ±6 V), supports DC-coupled signal paths, and delivers full-power gain flatness to 200 MHz. The internal bias circuitry ensures matched resistor tracking over temperature, maintaining ±1% gain accuracy across −40°C to +85°C.

Key Specifications

Pinout & Package

LMH6704MA/NOPB is housed in an 8-pin SOIC package (Package Number D0008A) with 1.27 mm lead pitch, 3.91 mm body width, and 1.75 mm max height. Thermal resistance is θJA = 160°C/W and θJC = 75°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar selectable gain buffer applications.

Compared with LMH6704MA/NOPB, LMH6703MA/NOPB offers lower cost and power but sacrifices inverting gain and output drive; THS3201D provides higher bandwidth but demands layout expertise and lacks integrated disable and video-grade linearity.

Availability

LMH6704MA/NOPB is available at Aetrix Electronics and suitable for HDTV video distribution, high-speed ADC front-ends, and RGB graphics interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LMH6704MA/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 innovation in high-speed amplifiers and precision signal chain solutions.

The LMH6704MA/NOPB belongs to TI's LMH™ high-speed buffer family, engineered for wide-dynamic-range video, instrumentation, and communications systems demanding low distortion, high output drive, and configurable gain without external components.

FAQ

What gain configurations does the LMH6704MA/NOPB support, and how are they selected?

The LMH6704MA/NOPB supports three gain modes: +1 V/V, +2 V/V, and −1 V/V. Selection is achieved by strapping Pins 2 (−IN), 3 (+IN), and 4 (VS−) as specified in Table 1 of the datasheet-no external resistors are required. For example, connecting Pin 3 to the input signal and leaving Pin 4 open configures AV = +1; grounding Pin 4 sets AV = +2. The internal 465 Ω RF and RG resistors ensure ±1% gain accuracy over temperature.

Does the LMH6704MA/NOPB require external compensation for stability?

No, the LMH6704MA/NOPB does not require external compensation for standard gain configurations. Its internal 465 Ω feedback network is optimized for stability at AV = +2. For AV = +1, TI recommends the alternate unity-gain circuit in Figure 20 (using RIN and CSS) to suppress peaking; this increases output-referred noise by ~10% but maintains flat frequency response. The LMH6704MA/NOPB remains stable driving capacitive loads up to 120 pF when paired with a series RISO resistor per Figure 23.

What is the maximum capacitive load the LMH6704MA/NOPB can drive without oscillation?

The LMH6704MA/NOPB can reliably drive capacitive loads up to 120 pF when used with an appropriate series output isolation resistor (RISO). Per Figure 23 and the "Suggested RISO vs. Cap Load" chart, a 15 Ω RISO is recommended for 100 pF loads to limit peaking to ≤0.5 dB. Without RISO, loads >5 pF may cause ringing or instability due to phase margin degradation. The LMH6704MA/NOPB's 0.05 Ω closed-loop output resistance helps dampen resonance when combined with RISO.

How does the disable function affect power consumption and output state?

When the DIS pin is pulled low (<0.8 V), the LMH6704MA/NOPB enters low-power disable mode with total supply current dropping to ~250 µA (ICC ≈ 350 µA, IEE ≈ 250 µA). The output transitions to high-impedance within 10 ns, and input terminals also go high-Z. Output leakage is ≤0.2 µA at ±1.8 V. Disabling preserves signal integrity in multiplexer or power-gating applications and eliminates DC path through the amplifier core.

Is the LMH6704MA/NOPB suitable for single-supply operation?

Yes, the LMH6704MA/NOPB supports single-supply operation. Its input common-mode range extends from VS− to VS+, and it has no internal ground reference. When operated from +8 V to GND, for example, the input can swing from 0 V to +8 V, and the output delivers rail-to-rail swing (±3.2 V into 100 Ω). Biasing networks (e.g., mid-rail reference) must be added externally to set DC operating points, as shown in TI's application notes for single-supply current-feedback amplifiers.