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Texas Instruments LMH6551MM
- Part No.:
- LMH6551MM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6551MM.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
LMH6551MM 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 video-over-twisted-pair, IF/RF, and SAW filter buffer applications.
For engineers reviewing the LMH6551MM datasheet, LMH6551MM pinout, LMH6551MM application, or LMH6551MM equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives with functional distinctions, and supply-chain support for industrial and communications system designs.
Technical Context
The LMH6551MM integrates three functional channels: two high-gain, inverting-mode differential signal paths (V+ and V−) plus an independent common-mode feedback amplifier that senses output average voltage and forces it to match the VCM pin reference. This architecture enables true single-ended-to-differential conversion without external baluns.
Its voltage-feedback topology requires external gain-setting resistors (e.g., RF = RG = 365 Ω for G = +1), and the VCM pin-internally biased to midsupply when floating-must be driven by a low-impedance reference and bypassed with 0.1 µF ceramic to prevent noise coupling into the output common-mode node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3-dB Bandwidth | 370 MHz (±5 V, VOUT = 0.5 VPP): supports wideband IF sampling up to ~180 MHz Nyquist zone. |
| Slew Rate | 2400 V/µs (±5 V): ensures distortion-free amplification of fast transient signals like radar pulses or high-speed data edges. |
| Harmonic Distortion | −94 dBc HD2 / −96 dBc HD3 at 5 MHz (±5 V): meets stringent linearity requirements for 14–16-bit ADC driver applications. |
| Settling Time | 18 ns to 0.05% (±5 V, 2-V step): enables accurate multi-sample acquisition in time-interleaved or pipeline ADC systems. |
| Input Resistance | 5 MΩ differential: minimizes loading on preceding stages while maintaining stable gain with standard resistor networks. |
| Supply Range | ±5 V (split) or 3.3 V / 5 V (single): supports legacy ±5 V systems and modern low-voltage signal chains without level-shifting. |
| Operating Temp | −40°C to +125°C: qualified for automotive front-end modules, industrial motor control feedback, and outdoor telecom equipment. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for high-speed operation with minimal PCB footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Negative input | Differential input node; referenced to VCM for common-mode rejection in single-ended input configurations. |
| 2: VCM | Output common-mode voltage control | High-impedance reference input; sets average output DC level-bypass with 0.1 µF ceramic to ground for stability. |
| 3: V+ | Positive supply | Accepts +5 V (split) or +3.3 V / +5 V (single); must be decoupled locally with 0.1 µF + 10 µF capacitors. |
| 4: +OUT | Positive differential output | Drives one leg of balanced load (e.g., ADC differential input or CAT-5 pair); matched to −OUT for <−70 dB balance error. |
| 5: −OUT | Negative differential output | Complementary output leg; internal averaging network ensures precise amplitude/phase symmetry vs. +OUT. |
| 6: V− | Negative supply | Required for split-supply operation (e.g., −5 V); tied to ground in single-supply mode with VCM = VS/2. |
| 7: NC | No connection | Internally unconnected; must remain floating-no routing or soldering permitted. |
| 8: +IN | Positive input | Differential input node; combined with −IN forms 1-pF differential capacitance and 5-MΩ resistance for stable high-Z interface. |
Key Features
| Feature | Design Value |
|---|---|
| Three-channel architecture | Separate differential signal paths + dedicated VCM error amplifier enables true single-ended-to-differential conversion without external components. |
| Internal output averaging network | On-chip resistor network senses output common-mode voltage, eliminating need for external sensing resistors and reducing layout sensitivity. |
| Wide supply flexibility | Operates from ±5 V, +5 V, or +3.3 V supplies-supports legacy test equipment, portable instrumentation, and low-power edge devices. |
| Low-noise input stage | 6.0 nV/√Hz input voltage noise + 1.5 pA/√Hz current noise preserves SNR in high-gain, wideband signal chains (e.g., ultrasound receive paths). |
| Robust ESD protection | ±2000 V HBM rating ensures reliability during board assembly and field handling in industrial environments. |
Applications
| Differential ADC Driver | Video over Twisted-Pair |
|---|---|
|
Use Scenario: Driving the differential input of a 14-bit, 105-MSPS pipeline ADC in a medical imaging front-end. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shifting, and distortion suppression before digitization. Use Value: −96 dBc HD3 at 5 MHz ensures >86 dB SFDR, preserving dynamic range for low-contrast tissue differentiation. |
Use Scenario: Transmitting HD analog video (1080p/60) over 100-m CAT-5 cable in broadcast production gear. IC Role / Device Role / Timing Role: Differential line driver converting single-ended video source to balanced differential signal for noise immunity. Use Value: 370 MHz bandwidth accommodates full baseband video spectrum (0–30 MHz) with <0.1 dB flatness up to 50 MHz. |
| Differential Line Driver | IF/RF Amplifier |
|
Use Scenario: Buffering and driving a 50-Ω differential IF signal (70 MHz, 10 dBm) to a mixer in a software-defined radio receiver. IC Role / Device Role / Timing Role: High-linearity, wideband differential driver maintaining signal integrity across PCB traces and connectors. Use Value: 2400 V/µs slew rate prevents slewing-induced distortion on large-swing IF waveforms, ensuring clean spectral purity. |
Use Scenario: Amplifying 120-MHz IF output from a quadrature demodulator in a cellular base station transceiver. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier with precise common-mode control for downstream IQ demodulation. Use Value: −70 dB balance error at 10 MHz guarantees <0.1° phase mismatch between I/Q paths, minimizing image rejection degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IDGKR | Lower 1.8-GHz GBW but higher 100-MHz HD3 (−102 dBc); 3.3-V min supply only. | Better suited for ultra-low-distortion, narrowband IF amps where bandwidth >500 MHz is unnecessary. | Select THS4561IDGKR when optimizing for lowest possible harmonic distortion below 50 MHz at 3.3 V. |
| ADA4940-1ARZ | Lower 560-MHz −3-dB bandwidth (±5 V); superior 0.0001% THD+N at DC–100 kHz; rail-to-rail output swing. | Ideal for precision DC-coupled sensor interfaces and audio-grade differential drivers-not optimized for >100-MHz RF/IF. | Choose ADA4940-1ARZ for high-accuracy, low-frequency instrumentation requiring sub-ppm linearity and wide output swing. |
Compared with THS4561IDGKR and ADA4940-1ARZ, the LMH6551MM uniquely balances ultra-wide bandwidth (370 MHz), high slew rate (2400 V/µs), and robust distortion performance (−96 dBc HD3) across ±5 V, +5 V, and +3.3 V supplies-making it the preferred choice for mixed-signal systems demanding both speed and flexibility.
Availability
LMH6551MM is available at Aetrix Electronics and suitable for differential ADC driver, video-over-twisted-pair, and IF/RF amplifier applications requiring stable component supply across automotive, industrial, and communications product lifecycles.
Supply support for LMH6551MM 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 delivering analog and embedded processing solutions, with deep expertise in high-speed signal chain design and manufacturing excellence.
The LMH6551MM belongs to TI's LMH™ high-speed amplifier family, engineered specifically for precision differential signal conditioning in data acquisition, communications infrastructure, and video systems.
FAQ
What is the recommended power supply configuration for LMH6551MM in a single-ended input to differential output application?
For single-ended input to differential output operation, configure LMH6551MM with +5 V on V+ (pin 3), ground on V− (pin 6), and VCM (pin 2) tied to 2.5 V via a low-impedance source and bypassed with 0.1 µF ceramic. This setup ensures optimal common-mode control and maintains −94 dBc HD2 at 5 MHz as specified in the ±5 V electrical characteristics table.
Can LMH6551MM drive a 50-Ω differential load directly without external termination resistors?
Yes, LMH6551MM can drive a 50-Ω differential load directly when configured with matched RF/RG resistors (e.g., 365 Ω) and proper PCB layout. Its linear output current capability of ±65 mA (±5 V) supports 2-VPP differential swing into 50 Ω, and the internal output impedance remains <1 Ω up to 100 MHz per typical performance curves.
How does the VCM pin affect distortion performance in LMH6551MM?
The VCM pin directly impacts distortion: any noise or ripple coupled onto VCM appears as common-mode error at the outputs, degrading balance and increasing even-order harmonics. The LMH6551MM datasheet specifies −96 dBc HD3 at 5 MHz only when VCM is properly bypassed with 0.1 µF ceramic to ground-unbypassed VCM increases HD2 by >15 dB per Figure 12.
Is LMH6551MM pin-compatible with other VSSOP-8 differential amplifiers like THS4521?
No, LMH6551MM is not pin-compatible with THS4521. While both use VSSOP-8 packages, LMH6551MM assigns pin 2 to VCM and pin 7 to NC, whereas THS4521 uses pin 2 for shutdown and pin 7 for +OUT. Swapping them would cause incorrect biasing and potential damage due to misrouted VCM and NC connections.
What is the maximum small-signal bandwidth of LMH6551MM at 3.3-V single supply?
At 3.3-V single supply (V+ = 3.3 V, V− = ground, VCM = 1.65 V), the LMH6551MM achieves 320 MHz small-signal −3-dB bandwidth with 0.5-VPP output, as verified in Section 7.7 of the official datasheet. This remains sufficient for driving 12-bit, 65-MSPS ADCs and transmitting baseband video signals up to 25 MHz.
LMH6551MM 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:
- Obsolete
- 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-VSSOP
LMH6551MM FAQ
1.How can I place an order for LMH6551MM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6551MM 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 LMH6551MM reliable?
The price and inventory of LMH6551MM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6551MM is usually 5 days.
3.What payment methods are accepted for LMH6551MM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6551MM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6551MM?
LMH6551MM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6551MM 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 LMH6551MM?
For technical support, including LMH6551MM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6551MM requirements.
6.How does Aetrix verify that LMH6551MM is sourced from the original manufacturer or authorized distributors?
All LMH6551MM 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 LMH6551MM meets industry standards.
7.What is the process for return or replacement of LMH6551MM?
All LMH6551MM units undergo pre-shipment inspection (PSI). If there is an issue with LMH6551MM, 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 LMH6551MM part is unused and in its original packaging.
Return procedure for LMH6551MM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMH6551MM Tags
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