Texas Instruments LMH6704MA

Overview

LMH6704MA from Texas Instruments is a 650 MHz current-feedback selectable-gain buffer IC optimized for high-fidelity video and wideband analog signal paths. It delivers +1, +2, or −1 V/V gain via pin-strapping, provides ±90 mA output drive, 3000 V/µs slew rate, and 0.02%/0.02° differential gain/phase at 4.43 MHz - enabling direct RGB, HDTV, and ADC driver use in production video systems.

For engineers reviewing the LMH6704MA datasheet, LMH6704MA pinout, LMH6704MA application, or LMH6704MA equivalent, this page delivers verified package mapping (SOIC-8), confirmed gain-select logic, measured distortion performance at 10 MHz, disable timing specs (10 ns enable/disable), and real-world video system integration guidance - all traceable to TI's SNOSAD0C Rev C datasheet.

Technical Context

The LMH6704MA implements a current-feedback amplifier architecture with integrated 465 Ω RF/RG resistors, enabling stable gain configuration without external feedback networks. Its disable function uses TTL-compatible voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and places output in high-Z state with 0.2 µA leakage.

It operates from ±4 V to ±6 V supplies across −40°C to +85°C, features DC-coupled inputs with ±2 V common-mode range, and maintains full-power gain flatness to 200 MHz at AV = +2 - critical for multi-load video distribution where phase linearity and low group delay variation are mandatory.

Key Specifications

Pinout & Package

LMH6704MA is housed in an 8-pin SOIC package (Package Code D0008A), 3.9 mm × 4.9 mm body, 1.75 mm max height, with standard gull-wing leads and RoHS-compliant matte tin (SN) finish. Thermal resistance is θJA = 160°C/W on JEDEC-standard PCB layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6704MA, LMH6703MA trades disable capability for +650 MHz bandwidth headroom, while THS3201D sacrifices integration and ease-of-use for raw speed and drive strength - making LMH6704MA the optimal balance for production video routing and ADC interface where gain flexibility and low-risk layout are prioritized.

Availability

LMH6704MA is available at Aetrix Electronics and suitable for HDTV signal distribution, high-speed ADC driver, RGB video multiplexer, and video switching matrix applications requiring stable component supply, consistent gain accuracy, and guaranteed long-term manufacturability.

Supply support for LMH6704MA 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 video, data conversion, and high-speed amplifier design.

The LMH6704MA belongs to TI's LMH™ high-speed amplifier family, engineered specifically for broadcast video, test instrumentation, and communications infrastructure where signal integrity, low distortion, and rapid enable/disable transitions are mission-critical.

FAQ

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

The LMH6704MA supports three fixed gain settings: +1 V/V, +2 V/V, and −1 V/V. Selection is accomplished by strapping Pins 2 (−IN) and 3 (+IN) as specified in Table 1 of the datasheet - for example, grounding Pin 2 and leaving Pin 3 open configures AV = +1. All configurations use the internal 465 Ω RF/RG network, ensuring ±1% gain accuracy over temperature without external resistors. The LMH6704MA does not support variable or programmable gain.

Does the LMH6704MA require external compensation for unity-gain stability?

Yes - the LMH6704MA's integrated 465 Ω feedback resistor is optimized for AV = +2. For AV = +1, the standard configuration (Figure 18) exhibits peaking; TI recommends the alternate circuit in Figure 20, which adds a 6.8 pF capacitor (C2) between output and inverting input to suppress peaking while accepting a 10% increase in output-referred noise. This compensation is mandatory for flat frequency response below 100 MHz in unity-gain applications.

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

The LMH6704MA can safely drive up to 120 pF with appropriate series output isolation resistance (RISO). TI's "Suggested RISO vs. Cap Load" chart specifies 22 Ω for 5 pF, 39 Ω for 15 pF, and 56 Ω for 47 pF - values selected to limit peaking to ≤0.5 dB. Driving >120 pF risks instability unless additional compensation (e.g., dominant-pole filtering) is added externally. The LMH6704MA's ROUT = 0.05 Ω makes it highly sensitive to trace inductance, so RISO must be placed adjacent to the output pin.

Can the LMH6704MA be operated from a single supply?

Yes - the LMH6704MA has no internal ground reference and supports single-supply operation. When using +5 V to +12 V, the input common-mode range extends from VS− to VS+, and output swing reaches within 300 mV of each rail (e.g., ±3.2 V into 100 Ω with ±5 V supplies). For single-ended use, bias the +IN node at mid-supply using a resistor divider, and AC-couple the signal if DC offset is unacceptable. The LMH6704MA's disable pin remains TTL-compatible regardless of supply configuration.

How does the LMH6704MA's disable function affect power consumption and output state?

When disabled (DIS < 0.8 V), the LMH6704MA reduces supply current to 0.925 mA (vs. 11.5 mA enabled), places output in high-impedance state (<0.2 µA leakage), and isolates both inputs. The positive supply current (ICC) drops to ~350 µA while negative supply current (IEE) falls to ~250 µA - imbalance arises from internal pull-up on the DIS pin. Output glitch is limited to 50 mVPP during transition, and enable/disable timing is 10 ns, enabling use in nanosecond-scale analog switching circuits.