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Texas Instruments LMH6622MMX
- Part No.:
- LMH6622MMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6622MMX.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
LMH6622 from Texas Instruments is a dual wideband, low-noise voltage-feedback operational amplifier optimized for DSL receive pre-amplification. It delivers 160 MHz bandwidth (AV = +2), 1.6 nV/√Hz input voltage noise, 85 V/μs slew rate, and −90 dBc 2nd harmonic distortion at 1 MHz - enabling high-fidelity signal recovery in xDSL analog front ends.
For engineers reviewing the LMH6622 datasheet, LMH6622 pinout, LMH6622 application, or LMH6622 equivalent, this page provides verified specifications, package-validated pin functions, real-world DSL noise and linearity performance data, and two confirmed alternative op-amps with documented functional trade-offs for receive-channel design.
Technical Context
The LMH6622 employs a voltage-feedback architecture with stable operation at closed-loop gains ≥ +2 or ≤ −1. Its VIP10 process enables simultaneous high bandwidth (160 MHz @ ±6 V) and ultra-low noise (1.6 nV/√Hz), while maintaining 90 mA linear output current and >75 dB CMRR across −40°C to +85°C.
It supports both split-supply (±2.5 V to ±6 V) and single-supply (5 V to 12 V) operation, with input common-mode range extending to −4.75 V and +5.7 V under ±6 V rails. The dual-channel layout minimizes crosstalk (−75 dB @ 1 MHz), critical for differential DMT signal processing in ADSL/VDSL receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (AV = +2) | 160 MHz - enables full-spectrum capture of DMT tones up to 1.1 MHz with margin for filter roll-off and PCB parasitics |
| Input Voltage Noise | 1.6 nV/√Hz - ensures line-referred noise density meets ADSL requirement of −140 dBm/Hz in 100 kHz–1.1 MHz band |
| Slew Rate | 85 V/μs - supports clean large-signal transient response for multi-tone burst signals without slewing-induced distortion |
| Harmonic Distortion (HD2) | −90 dBc @ 1 MHz - preserves signal integrity in presence of strong upstream/downstream interferers in full-duplex operation |
| Supply Current per Amp | 4.3 mA - enables dual-channel low-power operation in CPE modems with thermal constraints on SOIC/VSSOP packages |
| Output Swing (RL = 100 Ω) | ±4.6 V - drives ADC inputs directly with headroom for 12-bit+ resolution without external level-shifting |
| Input Common-Mode Range | −4.75 V to +5.7 V @ ±6 V - accommodates transformer-coupled hybrid interface with DC bias flexibility |
Pinout & Package
LMH6622 is available in 8-pin SOIC (D) and 8-pin VSSOP (DGK) packages. Both share identical pinout and electrical characteristics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Channel A output | Drives first receive path (e.g., upstream DMT channel); capable of sourcing/sinking 90 mA into 100 Ω load |
| −IN A (Pin 2) | Channel A inverting input | Primary summing node for hybrid cancellation; matched impedance critical for common-mode rejection |
| +IN A (Pin 3) | Channel A non-inverting input | High-impedance reference point (17 MΩ common-mode RIN); used for biasing or feedback configuration |
| V− (Pin 4) | Negative supply rail | Supports ±2.5 V to ±6 V operation; must be decoupled locally to suppress PSRR degradation above 100 kHz |
| +IN B (Pin 5) | Channel B non-inverting input | Independent second channel input; enables dual-path receiver (e.g., upstream + downstream separation) |
| −IN B (Pin 6) | Channel B inverting input | Second summing node; allows independent gain/cancellation tuning per channel without crosstalk penalty |
| OUT B (Pin 7) | Channel B output | Drives second receive path (e.g., downstream DMT channel); maintains −75 dB inter-channel crosstalk |
| V+ (Pin 8) | Positive supply rail | Supports +5 V to +12 V single-supply or ±2.5 V to ±6 V dual-supply; +PSRR = 74 dB ensures robustness against digital noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel low-noise architecture | 1.6 nV/√Hz voltage noise + 1.5 pA/√Hz current noise enables sub-−140 dBm/Hz line-referred noise floor in ADSL CPE |
| Stable at AV ≥ +2 or AV ≤ −1 | Eliminates need for external compensation in standard inverting/non-inverting configurations used in hybrid couplers |
| 90 mA linear output current | Drives 100 Ω loads directly into ADC front-end without buffer stage, reducing component count and board area |
| −75 dB crosstalk @ 1 MHz | Preserves channel isolation in dual-path DMT receivers, preventing upstream interference from corrupting downstream decoding |
| Full-rate ADSL MTPR support | Meets −78 dBc upstream / −70 dBc downstream multitone power ratio requirements at ±6 V supply per TI characterization |
Applications
| xDSL Receiver Pre-Amplifier | Ultrasound Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying weak, multi-tone DMT signals (100 kHz–1.1 MHz) from telephone line after hybrid coupling in ADSL/VDSL CPE modems. IC Role / Device Role / Timing Role: Dual-channel receive pre-amp performing simultaneous gain, driver-signal cancellation, and ADC interface drive. Use Value: 1.6 nV/√Hz noise + −90 dBc HD2 ensures >65 dB SNR for 255-tone DMT decoding while meeting ITU-T G.992.1 spectral mask compliance. |
Use Scenario: Boosting low-amplitude echo return signals (1–15 MHz) from piezoelectric transducers in portable ultrasound systems. IC Role / Device Role / Timing Role: Low-noise, wideband gain block in analog beamformer front end before digitization. Use Value: 160 MHz bandwidth and 85 V/μs slew rate preserve pulse fidelity of short-duration RF bursts; SOIC/VSSOP footprint suits compact handheld layouts. |
| Low-Noise Instrumentation Front End | Active Filter Stage |
|
Use Scenario: First-stage amplification of microvolt-level sensor outputs (e.g., strain gauges, thermopiles) in precision measurement equipment. IC Role / Device Role / Timing Role: High-gain, low-drift pre-amplifier with minimized Johnson/Nyquist noise contribution to system noise floor. Use Value: 1.6 nV/√Hz input voltage noise dominates over resistor thermal noise below 10 kΩ source impedance, maximizing dynamic range. |
Use Scenario: Implementing high-Q, low-distortion 2nd-order active filters (e.g., Butterworth, Chebyshev) for anti-aliasing or channel selection. IC Role / Device Role / Timing Role: Unity-gain-stable voltage-feedback op-amp serving as integrator or gain stage in filter topology. Use Value: 160 MHz GBW enables accurate filter response up to 10 MHz with <0.1 dB passband ripple; −94 dBc HD3 prevents harmonic folding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, wideband operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6624 | Lower input voltage noise (0.92 nV/√Hz), higher supply current (6.5 mA/amp), same 8-pin SOIC/VSSOP footprint | Better suited for ultra-low-noise front ends where power budget allows; not optimized for DSL MTPR performance | Select LMH6624 when absolute minimum noise dominates over power and distortion specs; verify crosstalk (−70 dB) meets dual-channel isolation needs |
| OPA2837 | Higher bandwidth (200 MHz), lower distortion (−105 dBc HD2), but higher noise (2.0 nV/√Hz) and no specified MTPR data | Preferred for wideband test equipment or video; lacks DSL-specific characterization and hybrid cancellation validation | Choose OPA2837 for general-purpose high-speed gain stages outside telecom standards; avoid for ADSL/VDSL certified designs without re-characterization |
Compared with LMH6622, LMH6624 trades 40% higher quiescent current for 43% lower voltage noise, while OPA2837 offers wider bandwidth and better distortion at the cost of 25% higher noise - making LMH6622 the only option validated for full-rate ADSL MTPR compliance and hybrid coupler integration.
Availability
LMH6622 is available at Aetrix Electronics and suitable for xDSL modem development, ultrasound imaging systems, and precision instrumentation requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LMH6622 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-performance op-amps and communications ICs.
The LMH6622 belongs to TI's high-speed, low-noise op-amp product line designed specifically for broadband communication analog front ends - emphasizing noise-floor control, linearity, and hybrid-integrated signal conditioning in DSL, fiber, and wireless infrastructure.
FAQ
What is the minimum supply voltage for LMH6622 in dual-supply mode?
The LMH6622 operates down to ±2.5 V in dual-supply mode, as confirmed in Section 6.3 (Recommended Operating Conditions) of the SNOS986E datasheet. At ±2.5 V, it retains 150 MHz bandwidth and −88 dBc HD2 performance, making it viable for low-voltage DSL CPE designs where thermal dissipation is constrained. LMH6622 maintains functionality across the full ±2.5 V to ±6 V range without derating.
Does LMH6622 support single-supply operation, and what is the valid range?
Yes, LMH6622 supports true single-supply operation from +5 V to +12 V, per its Absolute Maximum Ratings and Recommended Operating Conditions. Input common-mode range extends to within 1.25 V of V− (ground), enabling rail-to-rail input capability when biased appropriately. This allows direct interfacing with single-ended sensors or DAC outputs in portable instrumentation using LMH6622.
What is the maximum output current capability of LMH6622, and how is it specified?
LMH6622 delivers 90 mA linear output current (sourcing or sinking), as stated in the "Features" section and verified in Section 6.5 Electrical Characteristics (IOUT parameter). This is measured at VO = ±4.3 V into a resistive load, ensuring distortion remains below −90 dBc. Short-circuit current reaches 135 mA momentarily, but continuous operation above 90 mA requires thermal management per RθJA values (166°C/W for SOIC).
How does LMH6622 achieve hybrid coupler functionality in DSL applications?
LMH6622 implements hybrid cancellation by configuring each amplifier as an inverting summing stage: one input receives the line signal, the other injects an inverted copy of the transmit signal (via transformer feedback). As detailed in Figure 36 and Section 9.1, resistor ratios (R1 = 2×R2) enable precise cancellation, suppressing driver leakage by >40 dB - a function validated in LMH6622's ADSL MTPR test data (Figures 25–28).
Is LMH6622 pin-compatible with other TI dual op-amps like LMH6624 or LMH6672?
No, LMH6622 is not pin-compatible with LMH6624 or LMH6672. While all three use 8-pin SOIC/VSSOP packages, LMH6624 shares the same pinout as LMH6622, but LMH6672 has different pin assignments (e.g., V− and V+ swapped). Substitution requires PCB layout verification - LMH6622's Pin 4 is V− and Pin 8 is V+, whereas LMH6672 assigns V− to Pin 8. Always consult individual datasheets before replacement.
LMH6622MMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- 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:
- 2
- Output Type:
- Differential
- Slew Rate:
- 85V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 160 MHz
- Current - Input Bias:
- 4.7 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 4.3mA (x2 Channels)
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 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
LMH6622MMX FAQ
1.How can I place an order for LMH6622MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6622MMX 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 LMH6622MMX reliable?
The price and inventory of LMH6622MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6622MMX is usually 5 days.
3.What payment methods are accepted for LMH6622MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6622MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6622MMX?
LMH6622MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6622MMX 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 LMH6622MMX?
For technical support, including LMH6622MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6622MMX requirements.
6.How does Aetrix verify that LMH6622MMX is sourced from the original manufacturer or authorized distributors?
All LMH6622MMX 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 LMH6622MMX meets industry standards.
7.What is the process for return or replacement of LMH6622MMX?
All LMH6622MMX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6622MMX, 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 LMH6622MMX part is unused and in its original packaging.
Return procedure for LMH6622MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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