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Texas Instruments LMH6550MMX/NOPB
- Part No.:
- LMH6550MMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6550MMX/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,319
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Product details
Overview
LMH6550MMX/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 (VOUT = 0.5 VPP), 3000 V/µs slew rate, and −92/−103 dB HD2/HD3 at 5 MHz under ±5 V supply - enabling precision differential signaling in IF/RF and video-over-twisted-pair systems.
For engineers reviewing the LMH6550MMX/NOPB datasheet, LMH6550MMX/NOPB pinout, LMH6550MMX/NOPB application, or LMH6550MMX/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed use cases in ADC driver and differential line driver roles, and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The LMH6550MMX/NOPB implements a three-channel architecture: two independent high-gain differential signal paths (V+ and V−) operating in inverting mode, plus a dedicated common-mode feedback loop that senses output average voltage and forces precise VCM tracking via the VCM pin. This enables true single-ended-to-differential conversion without external baluns.
It requires external gain-setting resistors (e.g., RF = RG = 365 Ω for unity gain) and supports both split (±5 V) and single (5 V) supplies. The ENABLE pin (Pin 7) provides 10 ns enable/disable timing and reduces quiescent current to 1.2 mA in shutdown - critical for power-sensitive instrumentation and portable RF front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3-dB Bandwidth | 400 MHz at ±5 V, 0.5 VPP 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. |
| Settling Time | 8 ns to 0.1% - enables high-throughput data acquisition with minimal acquisition window overhead. |
| Input Resistance | 5 MΩ differential - minimizes loading on preceding stages in high-impedance sensor or filter interfaces. |
| Supply Current | 20 mA typical at ±5 V - balances performance and power in thermally constrained RF modules. |
| Enable/Disable Time | 10 ns - allows precise temporal gating in time-domain multiplexed systems. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for high-speed operation with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN− | Negative input | Differential input node; referenced to VCM for common-mode control. |
| 2: VCM | Output common-mode reference | High-impedance input setting target output DC level; bypass to ground with 0.1 µF ceramic capacitor. |
| 3: V+ | Positive supply | Accepts +2.25 V to +6 V in single-supply mode or +5 V in split-supply configuration. |
| 4: +OUT | Positive differential output | Driven complementary to −OUT; requires matched RO series termination for cable driving stability. |
| 5: −OUT | Negative differential output | Complementary output pair; combined swing up to 7.8 VPP differential at ±5 V supply. |
| 6: V− | Negative supply | Accepts −6 V to −2.25 V in split-supply mode; tied to GND in single-supply operation. |
| 7: EN | Enable control | Active-high logic input; floats high by default; <2.0 V disables amplifier, reducing IQ to 1.2 mA. |
| 8: IN+ | Positive input | Differential input node; paired with IN− to define gain and common-mode rejection path. |
Key Features
| Feature | Design Value |
|---|---|
| Single-ended to differential conversion | Enabled by internal VCM error amplifier - eliminates need for external balun in legacy signal chains. |
| Stable cable driving | Internal averaging resistor network + external RO termination supports CAT-5/6 twisted-pair transmission up to 100 m. |
| Low-noise interface | 6.0 nV/√Hz input voltage noise + 1.5 pA/√Hz current noise - preserves SNR in front-end amplification before ADC. |
| DC-coupled common-mode control | VCM pin accepts externally driven reference (0.4–3.8 V) - enables direct interfacing with ADC input common-mode requirements. |
| Fast power gating | 10 ns enable/disable transition - supports burst-mode operation in radar and TDD communication systems. |
Applications
| ADC Driver | Video Over Twisted-Pair |
|---|---|
Use Scenario: Driving the differential inputs of a 14-bit, 105 MSPS pipeline ADC in a communications baseband receiver. IC Role / Device Role / Timing Role: High-linearity, low-distortion differential buffer with precise VCM alignment to match ADC input specification. Use Value: Achieves −92 dBc HD2 at 5 MHz, enabling >78 dB SINAD without post-processing correction. |
Use Scenario: Transmitting HD-SDI video over 100 m of unshielded CAT-5 cable in broadcast infrastructure. IC Role / Device Role / Timing Role: Differential line driver with integrated common-mode feedback and RO-matched output stage. Use Value: Maintains <−65 dB balance error at 10 MHz, preserving chroma/luma separation over long runs. |
| Differential Line Driver | IF/RF Amplifier |
Use Scenario: Generating balanced local oscillator injection signals for a 70 MHz IF mixer stage in a software-defined radio. IC Role / Device Role / Timing Role: Wideband, low-phase-noise differential source with 400 MHz small-signal bandwidth. Use Value: Delivers 380 MHz large-signal bandwidth at 2 VPP, supporting multi-octave IF synthesis. |
Use Scenario: Amplifying 45–90 MHz intermediate frequency signals in a satellite TV tuner frontend. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier with 90 MHz 0.1-dB flatness and high PSRR (>74 dB). Use Value: Rejects supply ripple-induced sidebands, maintaining >65 dB adjacent channel rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IRGET | Lower 2.1 GHz GBW but higher 100 mA output drive; 3.3 V max supply; no VCM pin - uses internal fixed 1.65 V reference. | Optimized for low-voltage, high-current single-supply ADC drivers; unsuitable for programmable VCM or ±5 V systems. | Select THS4561IRGET only when supply is ≤3.3 V and VCM flexibility is not required. |
| ADA4940-1ARZ | Lower 560 MHz −3-dB bandwidth; 2000 V/µs slew rate; 2.3 nV/√Hz noise; requires external VCM buffer for precision referencing. | Better noise performance for low-frequency precision instrumentation; less suited for >100 MHz IF amplification. | Choose ADA4940-1ARZ when sub-3 nV/√Hz noise and DC accuracy outweigh bandwidth needs. |
Compared with THS4561IRGET and ADA4940-1ARZ, the LMH6550MMX/NOPB uniquely combines 400 MHz bandwidth, programmable VCM, ±5 V operation, and 3000 V/µs slew rate - making it the only option among the three capable of driving high-speed ADCs with variable common-mode requirements across dual-supply architectures.
Availability
LMH6550MMX/NOPB is available at Aetrix Electronics and suitable for high-speed ADC driver, video-over-twisted-pair, and IF/RF amplifier applications requiring stable component supply, consistent parametric performance across production lots, and long-term industrial lifecycle support.
Supply support for LMH6550MMX/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 components.
The LMH6550MMX/NOPB belongs to TI's high-speed differential amplifier product line, designed specifically for precision, wideband differential signal conditioning in data acquisition, communications, and test equipment.
FAQ
What is the maximum differential output voltage swing of the LMH6550MMX/NOPB?
The LMH6550MMX/NOPB delivers up to 7.8 VPP differential output swing under ±5 V supply conditions at 25°C. At temperature extremes (−40°C to +85°C), the guaranteed minimum is 7.18 VPP. This swing is achieved with matched load termination and proper VCM biasing - critical for maximizing dynamic range into high-resolution ADCs.
Does the LMH6550MMX/NOPB require external gain-setting resistors?
Yes, the LMH6550MMX/NOPB is a voltage-feedback amplifier requiring external RF and RG resistors to set closed-loop gain. For example, RF = RG = 365 Ω yields unity gain. Gain accuracy and distortion performance depend directly on resistor matching - 0.1% tolerance and tight layout symmetry are recommended for optimal results.
Can the LMH6550MMX/NOPB operate from a single 5-V supply?
Yes, the LMH6550MMX/NOPB supports single 5-V operation with V+ = 5 V and V− = GND. In this configuration, the VCM pin must be biased to 2.5 V to center the output common-mode voltage. Small-signal bandwidth drops to 350 MHz (vs. 400 MHz at ±5 V), and slew rate reduces to 1500 V/µs - verified in TI's Electrical Characteristics table for 5-V conditions.
What is the function of the VCM pin on the LMH6550MMX/NOPB?
The VCM pin on the LMH6550MMX/NOPB sets the target output common-mode voltage. It is a high-impedance input to an internal error amplifier that compares actual output average voltage against the VCM reference and corrects the outputs accordingly. Leaving VCM floating defaults to mid-supply (e.g., 0 V at ±5 V); driving it with a clean 0.4–3.8 V reference enables precise interfacing with ADC input requirements.
How does the ENABLE pin affect the LMH6550MMX/NOPB output state?
When the ENABLE pin (Pin 7) is pulled below 1.5 V, the LMH6550MMX/NOPB enters shutdown mode: quiescent current drops to 1.2 mA, and the output stage transitions to high impedance. The amplifier ceases linear operation, but external feedback/gain resistors remain in circuit - resulting in poor input-to-output isolation. Output pins retain no active drive capability in this state.
LMH6550MMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-VSSOP
LMH6550MMX/NOPB FAQ
1.How can I place an order for LMH6550MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6550MMX/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 LMH6550MMX/NOPB reliable?
The price and inventory of LMH6550MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6550MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6550MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6550MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6550MMX/NOPB?
LMH6550MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6550MMX/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 LMH6550MMX/NOPB?
For technical support, including LMH6550MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6550MMX/NOPB requirements.
6.How does Aetrix verify that LMH6550MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6550MMX/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 LMH6550MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6550MMX/NOPB?
All LMH6550MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6550MMX/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 LMH6550MMX/NOPB part is unused and in its original packaging.
Return procedure for LMH6550MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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