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Texas Instruments LMH6551MA/NOPB
- Part No.:
- LMH6551MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6551MA/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:269
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Product details
Overview
LMH6551MA/NOPB from Texas Instruments is a high-speed, fully differential voltage-feedback amplifier optimized for driving high-performance ADCs and balanced transmission lines. It delivers 370 MHz −3-dB bandwidth (±5 V supply), 2400 V/µs slew rate, and −94 dBc HD2 / −96 dBc HD3 at 5 MHz - enabling precision differential signaling in IF/RF and video-over-twisted-pair systems.
For engineers reviewing the LMH6551MA/NOPB datasheet, LMH6551MA/NOPB pinout, LMH6551MA/NOPB application, or LMH6551MA/NOPB equivalent, this device supports single-ended-to-differential conversion, wide common-mode input range (±4.7 V), programmable output common-mode voltage via VCM pin, and stable operation with ±5 V, +5 V, or +3.3 V supplies.
Technical Context
The LMH6551MA/NOPB integrates two independent signal-path channels (inverting-mode differential I/O) plus a dedicated high-bandwidth (200 MHz) common-mode feedback amplifier that senses and regulates output average voltage. Its internal 50-kΩ resistor divider sets VCM to midsupply when unconnected, while external reference drive enables precise common-mode control.
This architecture enables true single-ended-to-differential conversion without external baluns, maintains amplitude/phase balance (<−70 dB error at 10 MHz), and sustains low distortion across supply voltages (±5 V, +5 V, +3.3 V) and load conditions (500 Ω, 800 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3-dB Bandwidth | 370 MHz at ±5 V supply, 0.5 VPP output - supports >150 MSPS ADC sampling with minimal small-signal attenuation. |
| Slew Rate | 2400 V/µs at ±5 V - ensures faithful reproduction of fast transient signals (e.g., radar pulses, digital eye diagrams). |
| Harmonic Distortion | −94 dBc HD2 / −96 dBc HD3 at 5 MHz, 2 VPP, 800 Ω load - meets SNR > 80 dB requirements for 14-bit+ ADC drivers. |
| Input Resistance | 5 MΩ differential - minimizes loading on preceding stages (e.g., filters, SAW devices) without requiring impedance-matching networks. |
| Supply Range | ±5 V, +5 V, or +3.3 V operation - enables compatibility with legacy analog rails, modern low-voltage FPGAs, and mixed-signal SoCs. |
| Output Current | ±65 mA linear output current - drives 50 Ω twisted-pair cables (e.g., CAT5) or 500 Ω ADC inputs directly, eliminating buffer stages. |
| Settling Time | 18 ns to 0.05% with 2-V step - satisfies settling demands of high-speed SAR and pipeline ADCs with >100 kSPS throughput. |
Pinout & Package
LMH6551MA/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm), optimized for thermal performance and PCB layout simplicity in high-frequency analog designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Negative Input | Differential input node; used with +IN for fully differential input or driven alone for single-ended-to-differential conversion. |
| 2: VCM | Common-Mode Reference Input | High-impedance pin setting output common-mode voltage; bypassed with 0.1 µF ceramic capacitor to ground for noise immunity. |
| 3: V+ | Positive Supply | Accepts +5 V (single-supply) or +5 V (split-supply); must be decoupled locally to minimize PSRR degradation. |
| 4: +OUT | Positive Differential Output | Active output node; paired with −OUT to deliver balanced signal to ADC or transmission line. |
| 5: −OUT | Negative Differential Output | Complementary output node; phase-inverted relative to +OUT; critical for maintaining amplitude/phase balance. |
| 6: V− | Negative Supply | Required for split-supply operation (e.g., ±5 V); tied to ground in single-supply mode (+5 V or +3.3 V). |
| 7: NC | No Connection | Internally unused; must remain unconnected to avoid parasitic coupling or EMI susceptibility. |
| 8: +IN | Positive Input | Differential input node; forms matched pair with −IN; input capacitance is 1 pF, minimizing high-frequency peaking risk. |
Key Features
| Feature | Design Value |
|---|---|
| Three-channel functional architecture | Two independent signal paths + dedicated VCM feedback loop enable true single-ended-to-differential conversion without external components. |
| Programmable output common-mode voltage | VCM pin accepts external reference (0.3 V to VS–0.3 V) to set output DC level - essential for interfacing with ADCs requiring specific input common-mode ranges. |
| High-speed common-mode feedback | 200 MHz bandwidth on VCM path ensures rapid correction of output common-mode drift during fast transients or temperature shifts. |
| Low input capacitance | 1 pF differential input capacitance minimizes interaction with external gain-setting resistors and preserves stability in high-Z source applications. |
| Robust ESD protection | ±2000 V HBM rating allows safe handling in standard manufacturing environments without special ESD controls. |
Applications
| Differential ADC Driver | Video Over Twisted-Pair |
|---|---|
|
Use Scenario: Driving the differential input of a 14-bit, 125 MSPS pipeline ADC in a communications baseband receiver. IC Role / Device Role / Timing Role: Final-stage signal conditioning amplifier providing gain, common-mode level shifting, and distortion-limited bandwidth before digitization. Use Value: −96 dBc HD3 at 5 MHz ensures >80 dB SNR margin, preserving ENOB ≥ 13.5 bits under full-scale input conditions. |
Use Scenario: Transmitting HD video (720p60) over 100 m of CAT5e cable in security camera systems. IC Role / Device Role / Timing Role: Differential line driver converting single-ended video DAC output into balanced, noise-immune signal for long-haul transmission. Use Value: 370 MHz bandwidth and ±65 mA output current maintain signal integrity through 100-Ω characteristic impedance cable with <0.5 dB loss at Nyquist frequency. |
| IF Amplifier | SAW Filter Buffer/Driver |
|
Use Scenario: Amplifying 70 MHz IF signals in software-defined radio front-ends prior to downconversion. IC Role / Device Role / Timing Role: High-linearity gain block placed between bandpass filter and mixer, operating at fixed gain with minimal group delay variation. Use Value: 50 MHz 0.1-dB bandwidth ensures flat gain response across entire IF channel, preventing adjacent-channel interference in multi-carrier systems. |
Use Scenario: Isolating and buffering the output of a 214 MHz SAW bandpass filter in GPS/GNSS RF front-ends. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance buffer preventing SAW filter detuning while delivering clean differential signal to LNA or mixer. Use Value: 5 MΩ input resistance avoids loading SAW filter's high-Q resonant circuit, preserving insertion loss and shape factor specifications. |
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 320 MHz bandwidth, higher 12.5 mA supply current, integrated resistive feedback network (fixed gains only). | Better suited for space-constrained, fixed-gain designs where board area is prioritized over bandwidth flexibility. | Select THS4561IRGET when gain is fixed at 1, 2, or 4 and PCB real estate is limited; LMH6551MA/NOPB preferred for variable-gain, ultra-wideband, or low-distortion-critical use cases. |
| ADA4940-1ARZ | Higher 1 GHz bandwidth but lower −75 dBc HD3 at 5 MHz; requires dual ±5 V supply only (no +5 V single-supply mode). | Ideal for ultra-high-frequency instrumentation where bandwidth dominates distortion concerns. | Choose ADA4940-1ARZ for >500 MHz signal chains needing maximum speed; LMH6551MA/NOPB remains optimal for ADC driver applications demanding both bandwidth and distortion performance below 100 MHz. |
Compared with THS4561IRGET and ADA4940-1ARZ, LMH6551MA/NOPB uniquely balances 370 MHz bandwidth, −96 dBc HD3, ±5 V/+5 V/+3.3 V supply flexibility, and external gain-setting freedom - making it the most versatile choice for high-fidelity ADC interface and video transmission designs.
Availability
LMH6551MA/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 industrial lifecycle support, and traceable sourcing.
Supply support for LMH6551MA/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 amplifiers and data converter interfaces.
The LMH6551MA/NOPB belongs to TI's LMH™ high-speed amplifier family, engineered specifically for precision differential signal conditioning in communications, test equipment, and high-resolution data acquisition systems.
FAQ
What supply voltages does the LMH6551MA/NOPB support?
The LMH6551MA/NOPB operates across three supply configurations: ±5 V (split), +5 V (single with V− grounded), and +3.3 V (single). At ±5 V, it achieves 370 MHz bandwidth and −96 dBc HD3; at +3.3 V, bandwidth reduces to 320 MHz with 700 V/µs slew rate - all while maintaining full functionality and specified distortion performance per datasheet test conditions.
How does the VCM pin function in the LMH6551MA/NOPB?
The VCM pin on the LMH6551MA/NOPB sets the output common-mode voltage by feeding a reference into an internal error amplifier. When left open, it defaults to midsupply via internal 50-kΩ resistors. Driving it with an external low-impedance reference (0.3 V to VS–0.3 V) allows precise control of output DC level - critical for matching ADC input common-mode requirements without additional level-shifting circuitry.
Can the LMH6551MA/NOPB drive 50 Ω transmission lines directly?
Yes, the LMH6551MA/NOPB delivers ±65 mA linear output current and is rated for 500 Ω loads, enabling direct drive of 50 Ω twisted-pair cables (e.g., CAT5) when configured with appropriate termination. For optimal balance and return loss, use symmetric 50 Ω series resistors at each output and match trace lengths - verified in TI's typical application schematics for video-over-twisted-pair implementations.
What is the minimum recommended gain configuration for stable operation of the LMH6551MA/NOPB?
The LMH6551MA/NOPB is unity-gain stable with external gain-setting resistors. Minimum stable gain is G = +1 (RF = RG), validated across all supply voltages (±5 V, +5 V, +3.3 V) and load conditions (500 Ω, 800 Ω). TI's datasheet specifies performance metrics including bandwidth, distortion, and settling time explicitly at G = +1, confirming robust stability without phase compensation.
Does the LMH6551MA/NOPB require external compensation capacitors?
No, the LMH6551MA/NOPB is internally compensated and does not require external compensation capacitors. Stability is ensured across its full operating range using only external gain-setting and feedback resistors (e.g., RF = RG = 365 Ω for G = +1). Layout best practices - such as local 0.1 µF VCM bypassing and tight power-supply decoupling - are sufficient to maintain stability at 370 MHz.
LMH6551MA/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:
- 2400V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 370 MHz
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 12.5mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMH6551MA/NOPB FAQ
1.How can I place an order for LMH6551MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6551MA/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 LMH6551MA/NOPB reliable?
The price and inventory of LMH6551MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6551MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6551MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6551MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6551MA/NOPB?
LMH6551MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6551MA/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 LMH6551MA/NOPB?
For technical support, including LMH6551MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6551MA/NOPB requirements.
6.How does Aetrix verify that LMH6551MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6551MA/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 LMH6551MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6551MA/NOPB?
All LMH6551MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6551MA/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 LMH6551MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6551MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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