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Texas Instruments LMH6551QMMX/NOPB
- Part No.:
- LMH6551QMMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6551QMMX/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
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Product details
Overview
LMH6551QMMX/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, 0.5 VPP), 2400 V/µs slew rate, and −94/−96 dBc HD2/HD3 at 5 MHz - enabling low-distortion differential signaling in automotive IF/RF and video-over-twisted-pair systems.
For engineers reviewing the LMH6551QMMX/NOPB datasheet, LMH6551QMMX/NOPB pinout, LMH6551QMMX/NOPB application, or LMH6551QMMX/NOPB equivalent, this AEC-Q100 Grade 1 qualified device supports split- and single-supply operation (3–11 V total), offers user-configurable gain via external resistors, and provides precise common-mode control via the VCM pin for robust ADC interface design.
Technical Context
The LMH6551QMMX/NOPB implements a three-channel architecture: two independent signal paths (V+ and V−) operating as inverting-mode amplifiers, plus a dedicated high-bandwidth (200 MHz small-signal) common-mode feedback circuit that enforces output balance and sets output common-mode voltage via the VCM pin. This enables true single-ended-to-differential conversion without external transformers.
As a voltage-feedback amplifier, its closed-loop gain is set by external RF/RG resistor networks (e.g., G = +1 with 365 Ω), while stability under capacitive loads (e.g., ADC inputs) is maintained using series output resistors (RO). Its input stage includes built-in 0.7 V offset for single-supply compatibility, and DC CMRR exceeds 80 dB when external resistors are matched to 0.1%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 370 MHz (±5 V, 0.5 VPP): supports >100 MSPS ADC sampling with minimal amplitude loss |
| Slew Rate | 2400 V/µs (±5 V): ensures faithful reproduction of fast transient signals without slewing distortion |
| Harmonic Distortion | −94 dBc HD2 / −96 dBc HD3 @ 5 MHz: preserves signal fidelity in wideband communications and imaging |
| Settling Time | 18 ns to 0.05% (2 V step): meets timing requirements for high-speed data acquisition systems |
| Supply Range | 3 V to 11 V total (±1.5 V to ±5.5 V or 3 V to 5.5 V single): enables flexible power architecture in automotive and industrial designs |
| Operating Temp | −40°C to +125°C: certified for under-hood automotive applications per AEC-Q100 Grade 1 |
| Input Impedance | 5 MΩ differential resistance: minimizes loading on preceding stages in high-Z sensor or filter interfaces |
Pinout & Package
LMH6551QMMX/NOPB is housed in an 8-pin VSSOP package (Package Code DGK), with 0.65 mm pitch and exposed thermal pad. The package supports high-density PCB layouts and provides thermal resistance θJA = 159°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Inverting input | Differential signal path input; referenced to VCM for common-mode control |
| 2: +IN | Non-inverting input | Differential signal path input; paired with −IN for fully differential operation |
| 3: V− | Negative supply rail | Connects to ground or negative supply; must be bypassed with 0.01 µF + 0.1 µF ceramic caps |
| 4: +OUT | Positive differential output | Drives one leg of balanced load (e.g., ADC differential input or CAT-5 pair) |
| 5: −OUT | Negative differential output | Drives complementary leg; output balance error < −70 dB ensures clean differential swing |
| 6: V+ | Positive supply rail | Connects to positive supply; bypassing critical for PSRR > 71 dB and noise immunity |
| 7: VCM | Common-mode reference input | High-impedance (25 kΩ) pin setting output common-mode voltage; requires 0.1 µF bypass to ground |
| 8: NC | No connect | Internally unused; leave unconnected and unstubbed per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Three-channel architecture | Independent V+/V− signal paths + dedicated VCM feedback loop enable true single-ended-to-differential conversion without external baluns |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C) ensures reliability in engine control, ADAS camera links, and infotainment video interfaces |
| VCM pin control | User-definable output common-mode voltage (e.g., 1.25 V or 2.5 V) allows seamless interfacing with mixed-supply ADCs and FPGAs |
| Stability under capacitive load | Validated with RO isolation resistors and CL up to 57 pF; supports direct connection to switched-capacitor ADC inputs |
| Low input bias current drift | −2.6 nA/°C average bias drift ensures stable DC operating point across temperature in precision sensor front-ends |
Applications
| Automotive Camera Link | High-Speed ADC Driver |
|---|---|
|
Use Scenario: Transmitting uncompressed video from rear-view or surround-view cameras over shielded twisted-pair cables to domain controllers. IC Role / Device Role / Timing Role: Differential line driver converting single-ended image sensor output to balanced 100 Ω differential signal compliant with automotive video standards. Use Value: 370 MHz bandwidth and −94 dBc HD2 support 1080p60 video with <0.1% differential gain/phase error over cable lengths up to 15 m. |
Use Scenario: Buffering and level-shifting analog signals before digitization in radar signal processors or motor control current sensing. IC Role / Device Role / Timing Role: High-fidelity differential driver isolating ADC input from source impedance variations and minimizing sampling-time aperture jitter. Use Value: 18 ns settling time to 0.05% and 2400 V/µs slew rate ensure accurate capture of fast transients in >100 MSPS SAR and pipeline ADCs. |
| IF Amplifier in 5G Baseband | SAW Filter Interface |
|
Use Scenario: Amplifying intermediate-frequency signals between mixer and SAW filter in automotive V2X or cellular telematics modems. IC Role / Device Role / Timing Role: Low-noise, low-distortion IF amplifier providing gain and impedance matching between active mixers and passive filters. Use Value: 6.0 nV/√Hz input voltage noise and −96 dBc HD3 at 5 MHz preserve EVM in QAM-modulated waveforms up to 100 MHz. |
Use Scenario: Driving high-Q SAW filters in GPS/GNSS front-ends where phase linearity and amplitude flatness are critical. IC Role / Device Role / Timing Role: Low-output-impedance buffer maintaining filter passband integrity and suppressing spurious responses caused by source mismatch. Use Value: Output balance error < −70 dB and 200 MHz VCM bandwidth prevent common-mode feedthrough that degrades filter stopband 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 bandwidth (1.8 GHz GBW vs. 370 MHz SSBW), higher supply current (18 mA vs. 12.5 mA), no AEC-Q100 qualification | Better suited for ultra-wideband DC-coupled instrumentation; lacks automotive temp range and VCM flexibility | Select THS4561IRGET only if >1 GHz small-signal bandwidth is required and automotive qualification is unnecessary |
| ADA4940-1ACPZ-R7 | Lower slew rate (850 V/µs), lower distortion at high frequencies (−82 dBc HD3 @ 20 MHz), same 8-pin LFCSP package | Optimized for precision DC-coupled applications (e.g., medical imaging); less suitable for >50 MHz video or IF signals | Choose ADA4940-1ACPZ-R7 when ultra-low DC offset (<0.2 mV) and low-frequency noise dominate over speed |
Compared with THS4561IRGET and ADA4940-1ACPZ-R7, LMH6551QMMX/NOPB uniquely balances automotive-grade reliability, 370 MHz bandwidth, and VCM-controlled common-mode flexibility - making it the optimal choice for cost-sensitive, high-volume automotive video and ADC interface designs requiring AEC-Q100 compliance.
Availability
LMH6551QMMX/NOPB is available at Aetrix Electronics and suitable for automotive camera links, high-speed ADC interfaces, IF amplification, SAW filter buffering, and differential signaling applications requiring stable component supply across extended temperature ranges.
Supply support for LMH6551QMMX/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 automotive-grade ICs.
The LMH6551QMMX/NOPB belongs to TI's LMH™ high-speed differential amplifier product line, engineered specifically for low-distortion, wideband signal conditioning in automotive ADAS, industrial data acquisition, and communications infrastructure.
FAQ
What is the maximum differential output voltage swing supported by the LMH6551QMMX/NOPB?
The LMH6551QMMX/NOPB delivers ±7.8 V peak-to-peak differential output swing under ±5 V supplies (±3.9 V per leg), and ±2.8 V peak-to-peak with 5 V single supply. This 15.6 VPP capability enables direct drive of high-input-impedance ADCs and long-line differential receivers without additional gain stages. Performance is verified across −40°C to +125°C per AEC-Q100 Grade 1 test conditions.
How does the VCM pin function in the LMH6551QMMX/NOPB, and what happens if left unconnected?
The VCM pin on the LMH6551QMMX/NOPB sets the output common-mode voltage via an internal 25 kΩ resistor divider; leaving it unconnected defaults output VOCM to mid-supply (e.g., 0 V with ±5 V rails). However, TI mandates 0.1 µF ceramic bypassing to ground regardless of usage - because noise or impedance on VCM directly couples to both outputs, degrading dynamic range and balance. The LMH6551QMMX/NOPB will operate but with compromised CMRR and distortion if VCM is unterminated or poorly bypassed.
Can the LMH6551QMMX/NOPB drive a 50 Ω differential load directly, and what external components are required?
The LMH6551QMMX/NOPB cannot drive a 50 Ω differential load directly due to output current limits (±65 mA linear); a 100 Ω total load requires ±70 mA minimum. TI recommends series isolation resistors (RO, typically 20–60 Ω) between each output and the load to ensure stability and limit current. For 50 Ω differential termination, use two 25 Ω RO resistors plus external 50 Ω termination at the load end - preserving bandwidth while protecting the LMH6551QMMX/NOPB from excessive dissipation.
What is the recommended layout practice for maintaining balance and minimizing distortion in LMH6551QMMX/NOPB circuits?
To maintain balance and minimize distortion, LMH6551QMMX/NOPB layouts must enforce strict symmetry: match RF/RG resistor values to ≤0.1%, place them equidistant from the device, route +IN/−IN and +OUT/−OUT traces with identical length and impedance, and avoid crossing sensitive nodes. Ground vias must be placed within 3 mm of each supply pin, and the VCM bypass capacitor must be placed adjacent to Pin 7 with direct plane connection - asymmetry in any of these areas increases balance error beyond the LMH6551QMMX/NOPB's specified −70 dB.
Does the LMH6551QMMX/NOPB support single-ended input operation, and how is gain configured in that mode?
Yes, the LMH6551QMMX/NOPB supports single-ended input operation using the common-mode feedback circuit to synthesize the missing differential input. Gain is configured identically to differential mode: AV ≈ RF/RG. However, since output is measured differentially while input is single-ended, the effective single-ended-to-differential gain is AV, whereas the single-ended-to-single-ended gain per output leg is AV/2 (−6 dB). TI confirms this configuration in Figure 30 of the SNOSB95E datasheet for LMH6551QMMX/NOPB.
LMH6551QMMX/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:
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMH6551QMMX/NOPB FAQ
1.How can I place an order for LMH6551QMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6551QMMX/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 LMH6551QMMX/NOPB reliable?
The price and inventory of LMH6551QMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6551QMMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6551QMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6551QMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6551QMMX/NOPB?
LMH6551QMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6551QMMX/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 LMH6551QMMX/NOPB?
For technical support, including LMH6551QMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6551QMMX/NOPB requirements.
6.How does Aetrix verify that LMH6551QMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6551QMMX/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 LMH6551QMMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6551QMMX/NOPB?
All LMH6551QMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6551QMMX/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 LMH6551QMMX/NOPB part is unused and in its original packaging.
Return procedure for LMH6551QMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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