Texas Instruments LMH6552SDX/NOPB

Overview

LMH6552SDX/NOPB from Texas Instruments is a 1.5-GHz fully differential current-feedback amplifier optimized as a high-fidelity ADC driver for 14-bit systems like the ADC14DS105, delivering 86 dBc SFDR and 74 dBc SNR up to 40 MHz. It supports ±5 V or ±2.5 V supplies, achieves 3800 V/µs slew rate, 10-ns 0.1% settling time, and −90 dB THD at 20 MHz in differential output configuration.

For engineers reviewing the LMH6552SDX/NOPB datasheet, LMH6552SDX/NOPB pinout, LMH6552SDX/NOPB application, or LMH6552SDX/NOPB equivalent, key selection criteria include differential bandwidth vs. gain (e.g., 1.5 GHz at AV = 1, 800 MHz at AV = 4), common-mode control precision (±16.5 mV offset), input capacitance (0.5 pF), and thermal performance in SOIC-8 (150°C/W θJA).

Technical Context

The LMH6552SDX/NOPB uses a proprietary differential current-mode input stage enabling stable operation at gains >1 without sacrificing flatness or distortion. Its integrated common-mode feedback loop allows independent VCM control with 400 MHz small-signal bandwidth and 607 V/µs slew rate, decoupling output common-mode setting from input common-mode range.

It operates in single-ended-to-differential or differential-to-differential modes using external gain-setting resistors (e.g., RF = RG = 357 Ω), supports AC/DC-coupled inputs, and features a 20-ns enable/disable pin (EN) with 3 V threshold under ±5 V supply and 0.5 V under ±2.5 V supply.

Key Specifications

Pinout & Package

LMH6552SDX/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed die attach pad (DAP) for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Compared with THS4561IDGKR and ADA4940-1ARZ, LMH6552SDX/NOPB uniquely combines 1.5 GHz bandwidth, integrated VCM control, and ±5 V operation-enabling single-chip ADC driving at full dynamic range without auxiliary circuitry or voltage derating.

Availability

LMH6552SDX/NOPB is available at Aetrix Electronics and suitable for differential ADC drivers, high-speed line drivers, and IF/RF signal conditioning requiring stable component supply, long-term production continuity, and TI-qualified automotive-grade traceability.

Supply support for LMH6552SDX/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 connectivity technologies, with over 50 years of innovation in high-performance signal chain solutions.

The LMH6552SDX/NOPB belongs to TI's high-speed differential amplifier product line, engineered specifically for wide-bandwidth, low-distortion signal conditioning in data acquisition, communications, and test equipment.

FAQ

What is the maximum small-signal bandwidth of the LMH6552SDX/NOPB?

The LMH6552SDX/NOPB achieves a 1.5-GHz −3 dB small-signal bandwidth at AV = 1 with ±5 V supplies and 1 kΩ load. This specification is measured under factory test conditions (TA = 25°C, V+ = +5 V, V− = −5 V, RL = 1 kΩ, VOUT = 0.2 VPP). Bandwidth decreases with higher gain settings-e.g., 810 MHz at AV = 4-and drops to 1.1 GHz under ±2.5 V operation.

Does the LMH6552SDX/NOPB require external components for basic differential-to-differential operation?

Yes, the LMH6552SDX/NOPB requires external gain-setting resistors (e.g., RF = RG = 357 Ω) to configure closed-loop gain and define output impedance. It also needs proper power supply bypassing (e.g., 0.1 µF ceramic + 10 µF tantalum per rail) and optional input/output AC coupling capacitors depending on DC-coupling requirements. No external op-amp is needed for VCM control due to its integrated circuit.

How does the enable pin (EN) function on the LMH6552SDX/NOPB?

The EN pin (Pin 7) is an active-high digital control that places the LMH6552SDX/NOPB into low-power shutdown mode when pulled below its threshold (3 V typical at ±5 V supply, 0.5 V at ±2.5 V). Enable/disable transitions occur within 15 ns, and shutdown current is 600 µA max. The pin has no internal pull-up/down and must be driven by a clean logic source to avoid metastability.

Can the LMH6552SDX/NOPB drive a 50 Ω differential load?

No-the LMH6552SDX/NOPB is not characterized to drive 50 Ω differential loads. Its electrical specifications assume 500 Ω or 1 kΩ differential loads (e.g., RL = 500 Ω across +OUT and −OUT). Driving 100 Ω loads is possible with reduced output swing and increased distortion; 50 Ω loads exceed linear output current capability (±80 mA max) and risk thermal overload or clipping.

What is the input common-mode voltage range for the LMH6552SDX/NOPB at ±5 V supply?

At ±5 V supply, the LMH6552SDX/NOPB supports an input common-mode voltage range of ±3.5 V to ±3.8 V (CMRR >38 dB). This range is centered around 0 V and allows direct connection to AC-coupled sources or DC-biased sensors operating within ±3.5 V. Exceeding this range degrades CMRR and may cause input stage saturation.