Texas Instruments LMH6704MF

Overview

LMH6704MF from Texas Instruments is a 650 MHz current-feedback selectable-gain buffer in SOT-23-6 package, configured for gains of +1, +2, or −1 V/V with on-chip 465 Ω RF/RG resistors. It delivers ±90 mA output current, 3000 V/µs slew rate, and 2.3 nV/√Hz input voltage noise, enabling high-fidelity video signal distribution in HDTV and RGB systems.

For engineers reviewing the LMH6704MF datasheet, LMH6704MF pinout, LMH6704MF application, or LMH6704MF equivalent, this page provides verified gain configurations, disable timing (10 ns TOFF), differential gain/phase (0.02%/0.02°), thermal resistance (θJA = 187°C/W), and SOT-23-6 layout guidance per TI CLC730216 evaluation board.

Technical Context

The LMH6704MF implements a current-feedback architecture with integrated 465 Ω feedback and gain-setting resistors, eliminating external components for AV = +1/+2/−1 configurations. Its disable pin (DIS) accepts TTL-compatible logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) to place the output in high-impedance state with 0.25 mA quiescent current.

It operates from ±4 V to ±6 V supplies across −40°C to +85°C, achieves full-power gain flatness to 200 MHz, and maintains <0.1 dB ripple up to 200 MHz at AV = +2. The internal bias circuitry uses matched transistor pairs and pull-up resistors to ensure stable enable/disable transitions without output glitches exceeding 50 mVPP.

Key Specifications

Pinout & Package

SOT-23-6 package (TI package code DBV0006A), 1.6 mm × 2.8 mm footprint, 1.1 mm height, moisture sensitivity level 1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6704MF, LMH6703MF removes disable capability to reduce die size and cost, while THS3201DBVR trades integrated gain selection for raw bandwidth and higher power - making LMH6704MF optimal for video distribution and multiplexing where gain configurability and low-glitch disable are mandatory.

Availability

LMH6704MF is available at Aetrix Electronics and suitable for HDTV signal distribution, ADC driver stages, PAL/NTSC video amplification, and high-speed analog multiplexing requiring stable component supply across industrial and broadcast design cycles.

Supply support for LMH6704MF 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 amplifier design and video signal conditioning.

The LMH6704MF belongs to TI's LMH™ high-speed buffer family, engineered specifically for wide-dynamic-range video systems demanding exceptional signal fidelity, low distortion, and simplified PCB layout through integrated gain-setting resistors.

FAQ

What gain configurations does the LMH6704MF support, and how are they selected?

The LMH6704MF supports three gain configurations: +1 V/V, +2 V/V, and −1 V/V. Selection is achieved solely by strapping pins 2 (+IN) and 3 (−IN) as specified in Table 1 of the datasheet - no external resistors required. For AV = +2, +IN connects to signal and −IN grounds; for AV = +1, +IN connects to signal and −IN floats; for AV = −1, +IN grounds and −IN connects to signal. This pin-strapping method ensures ±1% gain accuracy over temperature due to matched on-chip 465 Ω resistors, and is validated for LMH6704MF in TI's SNOSAD0C datasheet.

How does the disable function operate on the LMH6704MF, and what are its timing characteristics?

The LMH6704MF disable pin (Pin 5) accepts TTL-compatible logic: ≥2.0 V or floating enables operation; ≤0.8 V disables the amplifier, placing output in high-impedance state with 0.25 mA total supply current. Measured enable/disable times are both 10 ns, with output glitch limited to 50 mVPP. During disable, ICC ≈ 350 µA and IEE ≈ 250 µA due to internal pull-up, and disabled output leakage is ≤0.2 µA at ±1.8 V. These values are confirmed in Electrical Characteristics tables for LMH6704MF under "Enable/Disable Performance".

Can the LMH6704MF drive 75 Ω video loads directly, and what layout practices minimize distortion?

Yes, the LMH6704MF delivers ±90 mA output current and is explicitly characterized for 75 Ω loads in video applications. To minimize differential gain/phase distortion (0.02%/0.02°), TI recommends back-termination: place a 75 Ω resistor from output to ground at the load end of the transmission line. Layout best practices include removing ground/power planes near pins 1–3, using 0.01 µF + 6.8 µF bypass capacitors per supply rail adjacent to pins 4 and 6, and adding a 22 Ω series RISO if driving >5 pF capacitance - all validated on LMH6704MF evaluation board CLC730216.

What is the thermal performance of the LMH6704MF in its SOT-23-6 package?

The LMH6704MF in SOT-23-6 (DBV) package has θJA = 187°C/W and θJC = 120°C/W. At ambient 85°C and ±5 V supplies, maximum allowable power dissipation is PD = (150°C − 85°C)/187°C/W ≈ 347 mW. With 11.5 mA supply current and no load, quiescent power is ~115 mW; under full ±90 mA output swing into 75 Ω, additional dissipation remains within safe limits. Thermal derating is confirmed in Operating Ratings and Package Thermal Data sections of the LMH6704MF datasheet, and the package is rated MSL-1 for 260°C reflow.

Does the LMH6704MF require external compensation, and how does it handle capacitive loads?

No, the LMH6704MF does not require external compensation - its internal 465 Ω feedback network is optimized for stability across all gain modes. However, for capacitive loads >5 pF (e.g., long traces or LCD panel inputs), TI specifies a series output resistor (RISO) to suppress peaking: 22 Ω for 47 pF, 15 Ω for 100 pF. This RISO value is derived from empirical testing shown in Figure 5 ("Suggested RISO vs. Capacitive Load") and validated on LMH6704MF evaluation board CLC730216. Without RISO, ringing and gain peaking occur, degrading pulse response and harmonic distortion.