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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments LMH6550MA/NOPB

Name: LMH6550MA/NOPB
Brand: Texas Instruments
SKU: LMH6550MA/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMH6550MA/NOPB

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LMH6550MA/NOPB.pdf

Description:: IC VOLTAGE FEEDBACK 1 CIRC 8SOIC

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Product details

Overview

LMH6550MA/NOPB from Texas Instruments is a high-speed, fully differential voltage-feedback operational amplifier optimized for driving high-performance ADCs and balanced transmission lines. It delivers 400 MHz −3-dB bandwidth (V_OUT = 0.5 V_PP), 3000 V/µs slew rate, and −92/−103 dB HD2/HD3 at 5 MHz under ±5 V supply - enabling precise single-ended-to-differential conversion in IF/RF signal chains and video-over-twisted-pair systems.

For engineers reviewing the LMH6550MA/NOPB datasheet, LMH6550MA/NOPB pinout, LMH6550MA/NOPB application, or LMH6550MA/NOPB equivalent, key selection criteria include differential output swing (7.8 V_PP), enable/disable timing (10 ns), VCM pin control of output common-mode voltage, and SOIC-8 package compatibility with standard PCB layout practices for high-frequency analog routing.

Technical Context

The LMH6550MA/NOPB implements a three-channel architecture: two independent high-gain differential signal paths (V+ and V−) operating in inverting mode, plus a dedicated high-bandwidth (210 MHz) common-mode feedback amplifier that senses and regulates output common-mode voltage via the VCM pin. This enables true single-ended input operation while maintaining output balance and distortion performance.

It functions as a voltage-feedback amplifier requiring external gain-setting resistors (e.g., RF = RG = 365 Ω for unity gain), with internal averaging resistors (50 kΩ) establishing default midsupply VCM when the pin is left floating. The ENABLE pin (Pin 7) controls quiescent current, reducing supply current from 20 mA to 1.2 mA in shutdown without disrupting external resistor network integrity.

Key Specifications

Parameter	Value and Actual Design Meaning
−3-dB Bandwidth	400 MHz at 0.5 V_PP output - supports wideband IF sampling up to 200 MHz Nyquist zone.
Slew Rate	3000 V/µs - ensures faithful reproduction of fast transient signals without slewing-induced distortion.
Harmonic Distortion	−92 dBc HD2 / −103 dBc HD3 at 5 MHz - meets dynamic range requirements for 14-bit+ ADC drivers.
Output Swing	7.8 V_PP differential (±5 V supply) - drives 500 Ω loads to full scale with headroom for clipping margin.
Enable Time	10 ns - enables rapid power cycling in time-sliced or burst-mode signal acquisition systems.
Input Resistance	5 MΩ differential - minimizes loading on preceding stages while supporting precision gain-setting networks.
Common-Mode Range	−4.7 V to +3.2 V (±5 V supply) - accommodates rail-to-rail input signals in mixed-supply systems.

Pinout & Package

LMH6550MA/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), optimized for thermal dissipation and high-frequency layout with short trace lengths. Pin 1 is marked by a beveled corner or dot; the device uses standard JEDEC SOIC-8 footprint.

Pin/Terminal	Circuit Role	Design Meaning
1: IN−	Negative differential input	Accepts inverted-phase signal; matched impedance and layout symmetry critical for CMRR > 80 dB.
2: VCM	Output common-mode reference input	High-impedance node setting average output voltage; requires 0.1 µF ceramic bypass to ground.
3: V+	Positive supply rail	Connects to +5 V (or +2.5 V in single-supply config); must be decoupled with 0.01 µF + 0.1 µF SMT ceramics.
4: +OUT	Positive differential output	Drives one leg of balanced load (e.g., ADC differential input or twisted-pair cable); 75 mA linear drive capability.
5: −OUT	Negative differential output	Complementary output leg; phase-matched to +OUT within <1 ps skew for <−65 dB balance error at 10 MHz.
6: V−	Negative supply rail	Connects to −5 V (or GND in single-supply); same decoupling requirements as V+.
7: EN	Enable/disable control input	Logic-high (>2.0 V) enables amplifier; logic-low (<1.5 V) reduces I_Q to 1.2 mA; floats high if unused.
8: IN+	Positive differential input	Accepts non-inverted-phase signal; forms matched pair with IN− for optimal common-mode rejection.

Key Features

Feature	Design Value
Differential output balance control	VCM pin allows precise setting of output common-mode voltage (e.g., 0 V for bipolar ADCs or 2.5 V for single-supply systems), directly impacting dynamic range and CMRR.
High-speed shutdown	10 ns enable/disable transition enables power gating in multi-channel TDM systems without introducing switching transients into adjacent channels.
Internal common-mode sensing	On-chip 50 kΩ resistive divider sets default VCM to midsupply when pin is open, eliminating need for external bias network in basic configurations.
Robust output drive	±75 mA linear output current supports direct driving of 50 Ω–500 Ω differential loads, including CAT-5 cables and transformer-coupled ADC inputs.
Low-noise input stage	6.0 nV/√Hz input voltage noise and 1.5 pA/√Hz current noise preserve SNR in front-end amplification of weak RF/IF signals.

Applications

Differential ADC Driver	Video Over Twisted-Pair
Use Scenario: Driving the differential input of a 14-bit, 105 MSPS pipeline ADC in a communications baseband receiver. IC Role / Device Role / Timing Role: Fully differential amplifier converting single-ended IF signal to balanced format while rejecting supply and board-level common-mode noise. Use Value: −103 dBc HD3 at 5 MHz ensures >86 dB SFDR, preserving ENOB across full Nyquist band without post-processing correction.	Use Scenario: Transmitting HD video (720p/1080i) over 100 m of unshielded CAT-5 cable in security camera systems. IC Role / Device Role / Timing Role: Differential line driver with 7.8 V_PP swing and 8 ns settling time, compensating for cable loss and maintaining signal integrity. Use Value: 400 MHz bandwidth and −92 dBc HD2 enable transmission of luminance/chroma components with <0.1% differential gain/phase error.
Single-Ended to Differential Converter	IF/RF Amplifier Stage
Use Scenario: Converting output of a single-ended RF mixer to differential format prior to image-reject filtering in a zero-IF receiver. IC Role / Device Role / Timing Role: High-linearity FDA using VCM pin to set output common-mode to match filter's input requirement (e.g., 1.25 V). Use Value: 210 MHz common-mode bandwidth ensures fast VCM settling, preventing DC offset buildup during frequency hopping.	Use Scenario: Intermediate frequency amplification in a 70 MHz LTE femtocell transceiver, feeding a quadrature demodulator. IC Role / Device Role / Timing Role: Fixed-gain (G = 2) IF amplifier with external RF/RG resistors, providing flat group delay and minimal phase distortion. Use Value: 90 MHz 0.1-dB bandwidth maintains amplitude fidelity across 20 MHz LTE channel bandwidth with <0.05 dB ripple.

Differential ADC Driver

Video Over Twisted-Pair

Use Scenario: Driving the differential input of a 14-bit, 105 MSPS pipeline ADC in a communications baseband receiver.

IC Role / Device Role / Timing Role: Fully differential amplifier converting single-ended IF signal to balanced format while rejecting supply and board-level common-mode noise.

Use Value: −103 dBc HD3 at 5 MHz ensures >86 dB SFDR, preserving ENOB across full Nyquist band without post-processing correction.

Use Scenario: Transmitting HD video (720p/1080i) over 100 m of unshielded CAT-5 cable in security camera systems.

IC Role / Device Role / Timing Role: Differential line driver with 7.8 V_PP swing and 8 ns settling time, compensating for cable loss and maintaining signal integrity.

Use Value: 400 MHz bandwidth and −92 dBc HD2 enable transmission of luminance/chroma components with <0.1% differential gain/phase error.

Single-Ended to Differential Converter

IF/RF Amplifier Stage

Use Scenario: Converting output of a single-ended RF mixer to differential format prior to image-reject filtering in a zero-IF receiver.

IC Role / Device Role / Timing Role: High-linearity FDA using VCM pin to set output common-mode to match filter's input requirement (e.g., 1.25 V).

Use Value: 210 MHz common-mode bandwidth ensures fast VCM settling, preventing DC offset buildup during frequency hopping.

Use Scenario: Intermediate frequency amplification in a 70 MHz LTE femtocell transceiver, feeding a quadrature demodulator.

IC Role / Device Role / Timing Role: Fixed-gain (G = 2) IF amplifier with external RF/RG resistors, providing flat group delay and minimal phase distortion.

Use Value: 90 MHz 0.1-dB bandwidth maintains amplitude fidelity across 20 MHz LTE channel bandwidth with <0.05 dB ripple.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
THS4561IDR	Lower 3-dB bandwidth (1.8 GHz vs 400 MHz), higher supply current (27 mA vs 20 mA), integrated VCM buffer eliminates external bypass capacitor requirement.	Better suited for >500 MSPS ADC drivers where ultra-wide bandwidth dominates over power efficiency.	Select THS4561IDR when system requires >1 GHz small-signal bandwidth and can accommodate higher quiescent power.
ADA4940-1ARZ	Lower slew rate (850 V/µs), lower distortion (−105 dBc HD3 at 5 MHz), rail-to-rail output swing on ±5 V supply, no enable pin.	Ideal for precision low-power data acquisition where distortion floor and DC accuracy outweigh speed needs.	Choose ADA4940-1ARZ for battery-powered instrumentation requiring <15 mA supply current and sub-100 µV offset.

Compared with THS4561IDR and ADA4940-1ARZ, LMH6550MA/NOPB offers the best balance of bandwidth (400 MHz), power efficiency (20 mA), and integrated enable functionality - making it optimal for cost-sensitive, high-channel-count IF/ADC interface designs where rapid power cycling is required.

Availability

LMH6550MA/NOPB is available at Aetrix Electronics and suitable for differential ADC driver, video-over-twisted-pair, and IF amplifier applications requiring stable component supply, long-term production continuity, and TI-qualified automotive-grade traceability.

Supply support for LMH6550MA/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 amplifier design and manufacturing.

The LMH6550MA/NOPB belongs to TI's high-speed differential amplifier product line, engineered specifically for precision signal conditioning in communications infrastructure, test equipment, and high-fidelity data acquisition systems.

FAQ

What is the maximum differential output voltage swing of the LMH6550MA/NOPB?

The LMH6550MA/NOPB delivers up to 7.8 V_PP differential output swing under ±5 V supply conditions at 25°C. This value decreases slightly at temperature extremes (7.18 V_PP) and with heavier loads; actual swing depends on gain configuration, load impedance, and VCM setting. The LMH6550MA/NOPB maintains linear operation up to ±75 mA per output, ensuring clean swing into 500 Ω differential loads without clipping.

How does the VCM pin function in the LMH6550MA/NOPB?

The VCM pin on the LMH6550MA/NOPB sets the output common-mode voltage by serving as the reference input to an internal error amplifier. When driven externally (e.g., with a precision 2.5 V reference), it forces the average of +OUT and −OUT to match that voltage. If left floating, internal 50 kΩ resistors bias VCM to midsupply (0 V with ±5 V rails). A 0.1 µF ceramic capacitor to ground is mandatory to suppress noise coupling - any disturbance on VCM appears directly at the outputs, degrading dynamic range and balance. The LMH6550MA/NOPB's VCM circuit operates with 210 MHz bandwidth to maintain stability during fast common-mode transitions.

Can the LMH6550MA/NOPB operate from a single 5-V supply?

Yes, the LMH6550MA/NOPB supports single 5-V operation with V+ = 5 V and V− = GND. In this configuration, the recommended VCM voltage is 2.5 V to center the output swing. Electrical characteristics shift slightly versus ±5 V operation: small-signal bandwidth reduces to 350 MHz, slew rate drops to 1500 V/µs, and output swing is limited to 2.8 V_PP. Input common-mode range becomes 0.3 V to 3.2 V, and PSRR decreases to 72–77 dB. The LMH6550MA/NOPB retains full enable functionality and distortion performance (−89 dBc HD2 at 5 MHz), making it viable for space-constrained, low-voltage systems where dual supplies are impractical.

What external components are required for stable operation of the LMH6550MA/NOPB?

The LMH6550MA/NOPB requires external gain-setting resistors (RF and RG), output series resistors (RO), and supply/VCM bypass capacitors. For unity gain, RF = RG = 365 Ω (0.1% tolerance recommended). RO values (e.g., 13–40 Ω) depend on capacitive load and are selected using TI's suggested ROUT vs. CL curve. Each supply pin needs parallel 0.01 µF and 0.1 µF ceramic capacitors placed ≤3 mm from the pin and connected directly to a solid ground plane. The VCM pin requires a dedicated 0.1 µF ceramic capacitor to ground. No compensation capacitors are needed - the LMH6550MA/NOPB is internally compensated for unity-gain stability.

Does the LMH6550MA/NOPB support single-ended input operation?

Yes, the LMH6550MA/NOPB inherently supports single-ended input operation via its common-mode feedback architecture. Applying a signal to IN+ while grounding IN− (or vice versa) produces balanced differential outputs centered at the VCM-set common-mode voltage. Performance remains high: −92 dBc HD2 and −103 dBc HD3 at 5 MHz are maintained, and 8 ns settling time holds. Layout symmetry and resistor matching (RF = RG) are critical to preserve balance; mismatch >0.1% degrades CMRR and increases even-order distortion. The LMH6550MA/NOPB's internal VCM error amplifier actively corrects output imbalance, making it more robust than discrete op-amp-based solutions for SE-to-DE conversion.

LMH6550MA/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Amplifier Type:: Voltage Feedback

Number of Circuits:: 1

Output Type:: Differential

Slew Rate:: 3000V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 400 MHz

Current - Input Bias:: 8 µA

Voltage - Input Offset:: 1 mV

Current - Supply:: 20mA

Current - Output / Channel:: 75 mA

Voltage - Supply Span (Min):: 4.5 V

Voltage - Supply Span (Max):: 12 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LMH6550MA/NOPB FAQ

1.How can I place an order for LMH6550MA/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LMH6550MA/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LMH6550MA/NOPB reliable?

The price and inventory of LMH6550MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6550MA/NOPB is usually 5 days.

3.What payment methods are accepted for LMH6550MA/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6550MA/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMH6550MA/NOPB?

LMH6550MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMH6550MA/NOPB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LMH6550MA/NOPB?

For technical support, including LMH6550MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6550MA/NOPB requirements.

6.How does Aetrix verify that LMH6550MA/NOPB is sourced from the original manufacturer or authorized distributors?

All LMH6550MA/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMH6550MA/NOPB meets industry standards.

7.What is the process for return or replacement of LMH6550MA/NOPB?

All LMH6550MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6550MA/NOPB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LMH6550MA/NOPB part is unused and in its original packaging.

Return procedure for LMH6550MA/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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