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Texas Instruments LMH6551QMM/NOPB
- Part No.:
- LMH6551QMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6551QMM/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
LMH6551QMM/NOPB from Texas Instruments is a high-speed, AEC-Q100 Grade 1 qualified 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, 18 ns settling time to 0.05%, and −94/−96 dBc HD2/HD3 at 5 MHz - enabling precision video over twisted pair and IF/RF signal conditioning in automotive and industrial systems.
For engineers reviewing the LMH6551QMM/NOPB datasheet, LMH6551QMM/NOPB pinout, LMH6551QMM/NOPB application, or LMH6551QMM/NOPB equivalent, this page provides verified circuit role, validated package mapping, confirmed pin functions, real-world distortion performance across supply voltages (±5 V / 5 V / 3.3 V), and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The LMH6551QMM/NOPB implements a three-channel architecture: two matched differential signal paths (V+ and V−) operating as inverting-mode amplifiers, plus an independent common-mode feedback channel that actively enforces output balance and sets output common-mode voltage via the VCM pin. This enables true single-ended-to-differential conversion without external transformers.
It operates as a voltage-feedback amplifier with gain set by external resistors (RF/RG), supports split or single-supply operation (3 V to 11 V total), and requires precise resistor matching (≤0.1%) and symmetrical PCB layout to maintain >80 dB DC CMRR and low balance error (−70 dB at 10 MHz). The VCM pin is a high-impedance (25 kΩ) input requiring 0.1 µF ceramic bypassing to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 370 MHz at ±5 V, 0.5 VPP output - supports wideband IF/RF signal chains up to UHF. |
| Slew Rate | 2400 V/µs at ±5 V - ensures faithful reproduction of fast transient signals without slewing distortion. |
| Harmonic Distortion | −94 dBc HD2 / −96 dBc HD3 at 5 MHz - meets stringent SNR requirements for 14–16-bit ADC drivers. |
| Settling Time | 18 ns to 0.05% - enables accurate sampling in high-speed data acquisition systems. |
| Supply Range | 3 V to 11 V total (±1.5 V to ±5.5 V or 3 V to 11 V single-ended) - supports automotive 5 V and industrial 3.3 V rails. |
| Operating Temp | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
| Input Noise | 6.0 nV/√Hz (≥1 MHz) - preserves dynamic range in low-amplitude, high-frequency signal paths. |
Pinout & Package
LMH6551QMM/NOPB is housed in an 8-pin VSSOP package (Package Code DGK), 3.0 mm × 3.0 mm, 0.65 mm pitch, with exposed thermal pad. Pin 1 is marked by a dot; top view orientation matches TI's standard DGK footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Inverting input terminal | Accepts single-ended or differential input; referenced to VCM for common-mode control. |
| 2: +IN | Non-inverting input terminal | Used with −IN for differential input; unused in single-ended mode (tied to VCM or grounded via RC). |
| 3: V− | Negative supply rail | Connects to negative supply (e.g., −5 V or GND in single-supply); must be bypassed with 0.01 µF + 0.1 µF ceramics. |
| 4: +OUT | Positive differential output | Delivers inverted-phase output; drives one leg of balanced load (e.g., ADC differential input or CAT5 pair). |
| 5: −OUT | Negative differential output | Delivers non-inverted-phase output; complements +OUT to form fully differential output swing up to ±7.8 VPP. |
| 6: V+ | Positive supply rail | Connects to positive supply (e.g., +5 V); bypassing identical to V− is mandatory for stability. |
| 7: VCM | Common-mode reference input | High-impedance (25 kΩ) node setting output common-mode voltage; requires 0.1 µF ceramic bypass to ground. |
| 8: NC | No connect | Internally unused; must remain unconnected and un-bonded on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel architecture | Independent V+/V− signal paths + dedicated VCM feedback loop enable true single-ended-to-differential conversion with <−70 dB balance error. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications operating from −40°C to +125°C junction temperature with full parametric compliance. |
| Wide supply flexibility | Operates from 3 V to 11 V total supply - supports both ±5 V (370 MHz BW) and 3.3 V (320 MHz BW) configurations without redesign. |
| Low distortion at high frequency | −93 dBc HD3 at 5 MHz on 3.3 V supply - maintains ENOB >12 bits when driving medium-speed SAR or sigma-delta ADCs. |
| Output drive capability | ±65 mA linear output current and ±7.8 VPP swing into 500 Ω - sufficient to drive 100 Ω differential loads (e.g., ADC inputs) with margin. |
| Robust layout support | Specified performance assumes 0.1% resistor matching and symmetric routing - enables predictable CMRR >70 dB up to 100 MHz. |
Applications
| Automotive Camera Link Driver | Differential ADC Front-End |
|---|---|
Use Scenario: Transmitting high-resolution video from rear-view or surround-view cameras over shielded twisted-pair cabling in ADAS systems. IC Role / Device Role / Timing Role: Differential line driver converting single-ended image sensor output to robust balanced signaling compliant with FPDL-2 or similar protocols. Use Value: 370 MHz bandwidth and −94 dBc HD2 at 5 MHz preserve color fidelity and reduce EMI susceptibility over 10+ meter cable runs. |
Use Scenario: Conditioning analog signals prior to digitization in automotive radar or battery monitoring systems with 14-bit+ ADCs. IC Role / Device Role / Timing Role: High-fidelity differential driver ensuring minimal harmonic distortion and precise settling before ADC sample clock edge. Use Value: 18 ns settling to 0.05% and −96 dBc HD3 guarantee accurate representation of fast transients in pulse-based sensing applications. |
| Video-over-Twisted-Pair Transmitter | IF Amplifier in Cellular Infrastructure |
Use Scenario: Converting HDMI or analog CVBS signals to differential format for long-distance transmission in broadcast or security camera systems. IC Role / Device Role / Timing Role: Active balun performing single-ended-to-differential conversion while maintaining amplitude/phase balance. Use Value: −70 dB balance error at 10 MHz ensures >60 dB common-mode rejection, minimizing crosstalk and ground-loop artifacts. |
Use Scenario: Amplifying intermediate frequency signals (e.g., 70–250 MHz) in LTE/5G base station receiver front-ends before downconversion. IC Role / Device Role / Timing Role: Wideband IF amplifier providing gain, impedance transformation, and common-mode noise suppression. Use Value: 340 MHz large-signal bandwidth (2 VPP) and 50 MHz 0.1 dB flatness support multi-carrier signal integrity in dense spectral environments. |
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 power (10.5 mA vs. 12.5 mA), lower slew rate (1300 V/µs), wider input common-mode range (rail-to-rail), but reduced bandwidth (1.8 GHz GBW vs. 370 MHz SSBW). | Better suited for low-power, rail-to-rail input signal conditioning; less optimal for high-swing, high-fidelity ADC driving where slew-limited distortion matters. | Select THS4561IRGET when supply current <11 mA is critical and input signals approach supply rails; retain LMH6551QMM/NOPB for highest linearity at >100 MHz. |
| ADA4940-1ARZ | Higher input bias current (±3.5 µA vs. ±4 µA typ), lower HD3 (−100 dBc at 5 MHz), tighter gain drift (±3 ppm/°C), but narrower small-signal bandwidth (600 MHz vs. 370 MHz). | Preferred for ultra-low-distortion, precision instrumentation; less ideal for high-output-swing video or cable driving due to lower output current (±45 mA vs. ±65 mA). | Choose ADA4940-1ARZ for metrology-grade signal chains demanding sub-0.001% THD; choose LMH6551QMM/NOPB for automotive video or high-current differential line driving. |
Compared with THS4561IRGET and ADA4940-1ARZ, LMH6551QMM/NOPB uniquely balances high slew rate (2400 V/µs), AEC-Q100 Grade 1 qualification, and 370 MHz bandwidth - making it the only option among the three qualified for under-hood automotive video transmission with guaranteed 0.05% settling and −94 dBc HD2 performance.
Availability
LMH6551QMM/NOPB is available at Aetrix Electronics and suitable for automotive camera links, differential ADC front-ends, and IF amplification requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMH6551QMM/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 decades of automotive-grade product development and manufacturing expertise.
The LMH6551QMM/NOPB belongs to TI's LMH high-speed amplifier family, engineered specifically for precision differential signal conditioning in automotive ADAS, industrial data acquisition, and communications infrastructure where speed, linearity, and reliability are co-critical.
FAQ
What is the maximum differential output voltage swing supported by the LMH6551QMM/NOPB?
The LMH6551QMM/NOPB delivers up to ±7.8 VPP differential output swing into 500 Ω with ±5 V supplies, and ±2.8 VPP with 5 V single supply. At 3.3 V supply, it achieves ±0.9 VPP. These values assume linear operation within specified output current limits (±65 mA) and proper load termination - exceeding them risks clipping or increased distortion. The LMH6551QMM/NOPB datasheet specifies these under "Output Voltage Swing" in the Electrical Characteristics tables.
How does the VCM pin function in single-ended input configurations of the LMH6551QMM/NOPB?
In single-ended input mode, the VCM pin sets the output common-mode voltage and enables the internal common-mode feedback amplifier to synthesize the missing differential input signal. This allows balanced differential output even when only one input (e.g., −IN) is driven. The VCM pin must be bypassed with a 0.1 µF ceramic capacitor to ground regardless of usage - noise on this 25 kΩ input directly degrades output balance and dynamic range. LMH6551QMM/NOPB relies on this path for all single-ended-to-differential conversion.
Is the LMH6551QMM/NOPB suitable for driving ADCs with switched-capacitor inputs?
Yes - the LMH6551QMM/NOPB is explicitly designed for ADC driving, including those with switched-capacitor inputs. Its high slew rate (2400 V/µs), low distortion, and ability to source ±65 mA linear current allow it to settle quickly after capacitive kickback transients. TI recommends adding 56 Ω isolation resistors and 39 pF shunt capacitors at the output (per Figure 32 in the LMH6551QMM/NOPB datasheet) to ensure stability and anti-alias filtering. This configuration is validated for driving high-speed SAR and pipeline ADCs.
What layout practices are essential to achieve the published CMRR and balance performance of the LMH6551QMM/NOPB?
To achieve >80 dB DC CMRR and <−70 dB balance error, LMH6551QMM/NOPB requires strict board-level symmetry: matched 0.1% thin-film resistors for RF/RG/RO, identical trace lengths and widths for V+/V− paths, ground plane beneath the device, and separate low-inductance return paths for V+ and V− supplies. The VCM bypass capacitor must be placed ≤3 mm from the pin using 00805 ceramic parts. Asymmetry in any of these increases imbalance - the LMH6551QMM/NOPB's performance is highly dependent on implementation fidelity.
Does the LMH6551QMM/NOPB support single-supply operation, and what are its input common-mode limitations?
Yes, LMH6551QMM/NOPB supports single-supply operation from 3 V to 11 V total. Its input common-mode voltage range is limited to +0.4 V to +3.2 V (at 3.3 V supply) or +0.3 V to +3.1 V (at 5 V supply) - constrained by internal offset design. To accommodate wider input ranges, AC coupling or level-shifting is recommended. The LMH6551QMM/NOPB datasheet details these limits in the "Input Common Mode Voltage Range" parameter across all supply conditions.
LMH6551QMM/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
LMH6551QMM/NOPB FAQ
1.How can I place an order for LMH6551QMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6551QMM/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 LMH6551QMM/NOPB reliable?
The price and inventory of LMH6551QMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6551QMM/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6551QMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6551QMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6551QMM/NOPB?
LMH6551QMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6551QMM/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 LMH6551QMM/NOPB?
For technical support, including LMH6551QMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6551QMM/NOPB requirements.
6.How does Aetrix verify that LMH6551QMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6551QMM/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 LMH6551QMM/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6551QMM/NOPB?
All LMH6551QMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6551QMM/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 LMH6551QMM/NOPB part is unused and in its original packaging.
Return procedure for LMH6551QMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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