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Texas Instruments LMH6644MAX/NOPB
- Part No.:
- LMH6644MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6644MAX/NOPB.pdf
- Description:
- IC OPAMP VFB 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:21,778
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Product details
Overview
LMH6644MAX/NOPB from Texas Instruments is a quad-channel, rail-to-rail output voltage feedback operational amplifier optimized for low-power, high-speed applications. It delivers 130 MHz −3 dB bandwidth (at ±5 V), 130 V/µs slew rate, ±75 mA linear output current, and 40 mV rail-to-rail output swing - enabling precision buffering in ADC front-ends, portable video signal chains, and active filter stages operating from 2.7 V to 12.8 V supplies.
For engineers reviewing the LMH6644MAX/NOPB datasheet, LMH6644MAX/NOPB pinout, LMH6644MAX/NOPB application, or LMH6644MAX/NOPB equivalent, key selection criteria include guaranteed 130 MHz bandwidth at ±5 V, differential gain/phase of 0.01% / 0.01° under 150 Ω load, −62 dBc THD at 5 MHz, 68 ns settling time (±0.1%), and TSSOP-14 package compatibility with space-constrained industrial and consumer PCB layouts.
Technical Context
The LMH6644MAX/NOPB employs a voltage-feedback architecture with fully differential input stage and Class AB rail-to-rail output stage, supporting stable operation across gain configurations (AV = +1 to +10) without phase reversal when input common-mode exceeds rails. Its 0.1 dB gain flatness extends to 12 MHz into 150 Ω, ensuring fidelity in video and instrumentation signal paths.
Designed for single-supply (2.7–12.8 V) and split-supply (±1.35 V to ±6.4 V) operation, it features input common-mode range extending 0.5 V beyond V− and 1 V from V+, and output swing within 40 mV of either rail - critical for maximizing dynamic range in low-voltage systems such as battery-powered video encoders and sensor interface circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 130 MHz at ±5 V, AV = +1 - supports high-fidelity amplification up to UHF frequencies in RF IF stages and fast data acquisition. |
| Slew Rate | 130 V/µs (AV = −1) - maintains full-scale 2 VPP output swings at ≥40 MHz, enabling clean large-signal response in pulse amplifiers. |
| Output Current | ±75 mA linear drive - directly drives 150 Ω video loads or multiple parallel inputs without external buffers. |
| Supply Range | 2.7 V to 12.8 V single supply or ±1.35 V to ±6.4 V dual supply - compatible with Li-ion, 3.3 V, 5 V, and ±5 V system rails. |
| Input Noise | 17 nV/√Hz at 100 kHz - preserves SNR in precision sensor signal conditioning and low-level analog front-ends. |
| THD | −62 dBc at 5 MHz, VO = 2 VPP, RL = 2 kΩ, AV = +2 - meets broadcast-grade video distortion requirements (NTSC/PAL). |
| Settling Time | 68 ns to ±0.1% - enables accurate sampling in 12-bit+ ADC buffer applications with >10 MSPS throughput. |
Pinout & Package
TSSOP-14 package (5.00 mm × 4.40 mm body size), thermally enhanced for high-output-current operation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Channel A output | Drives external load; rail-to-rail swing (40 mV from rails) minimizes headroom loss in low-voltage systems. |
| −IN A (Pin 2) | Channel A inverting input | Differential input node; supports unity-gain stable feedback networks and active filter topologies. |
| +IN A (Pin 3) | Channel A non-inverting input | High-impedance input (3 MΩ common-mode resistance); accepts DC-coupled sensor or reference signals. |
| V+ (Pin 4) | Positive supply | Accepts 2.7–12.8 V single supply or positive rail in split-supply mode; PSRR >78 dB ensures noise immunity. |
| +IN B (Pin 5) | Channel B non-inverting input | Independent channel input; enables dual-path signal processing without crosstalk (CT rejection = 47 dB). |
| −IN B (Pin 6) | Channel B inverting input | Matches Pin 2 electrical behavior; supports matched gain-setting resistor networks across channels. |
| OUT B (Pin 7) | Channel B output | Electrically identical to OUT A; allows simultaneous dual-channel buffering with matched timing (TS = 68 ns). |
| OUT C (Pin 8) | Channel C output | Third independent output; supports triple-path architectures (e.g., RGB video line drivers). |
| +IN C (Pin 9) | Channel C non-inverting input | Enables three-channel parallel signal conditioning with consistent CMVR (−5.5 V to +4.0 V at ±5 V). |
| −IN C (Pin 10) | Channel C inverting input | Provides symmetrical feedback path for Channel C; maintains <2 dB peaking across all gains and loads. |
| V− (Pin 11) | Negative supply | Ground in single-supply mode or negative rail in split-supply; handles sinking current up to 145 mA. |
| +IN D (Pin 12) | Channel D non-inverting input | Fourth channel input; supports quad-channel applications like multi-axis sensor interfaces or 4-channel ADC buffers. |
| −IN D (Pin 13) | Channel D inverting input | Completes quad-channel set; all four op-amps share identical AC/DC specs per datasheet characterization. |
| OUT D (Pin 14) | Channel D output | Final output; rail-to-rail performance matches other channels - enables full quad-channel utilization without derating. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 40 mV of V+ or V− - maximizes usable dynamic range in 3 V and lower supply systems. |
| No output phase reversal | Input common-mode can exceed rails by 0.5 V (V−) or 1 V (V+) without instability - simplifies level-shifting design. |
| Low distortion video performance | DG = 0.01%, DP = 0.01° at NTSC - meets broadcast video standards without external trimming components. |
| Fast overdrive recovery | 100 ns - restores linear operation rapidly after saturation, critical in pulse-width modulated or burst-mode systems. |
| Output short-circuit protection | Infinite duration at VS < 6 V; 1.5 ms max at VS > 6 V - prevents latch-up during transient faults in power-sensitive designs. |
| Full characterization at 3 V, 5 V, ±5 V | All specs guaranteed across three supply configurations - eliminates guesswork in mixed-rail system integration. |
Applications
| ADC Buffer Amplifier | Portable Video Driver |
|---|---|
|
Use Scenario: Driving SAR or pipeline ADC inputs with 12+ bits resolution in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-noise, fast-settling buffer isolating ADC from source impedance while preserving full-scale accuracy. Use Value: 68 ns settling time and −62 dBc THD ensure ≤0.5 LSB error at 10 MSPS; rail-to-rail swing avoids clipping on 3 V supplies. |
Use Scenario: RGB line driver in handheld displays or DVD players with composite video output. IC Role / Device Role / Timing Role: Quad-channel video amplifier delivering synchronized, low-DP/DG signals to CRT/LCD backends. Use Value: 0.01% DG / 0.01° DP at 150 Ω load meets NTSC/PAL spec; 130 MHz BW supports 480p/576p pixel rates. |
| Active Filter Stage | Current Sense Buffer |
|
Use Scenario: 2nd-order Sallen-Key low-pass filter in motor control feedback loops with 100 kHz cutoff. IC Role / Device Role / Timing Role: High-GBW, low-distortion op-amp implementing precise frequency shaping without gain peaking. Use Value: 0.1 dB flatness to 12 MHz and <2 dB peaking guarantee passband integrity; 130 V/µs SR prevents slew-induced distortion. |
Use Scenario: Isolating shunt resistor voltage in high-side current monitoring for 24 V industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision difference amplifier with extended input CMVR (−5.5 V to +4.0 V at ±5 V) rejecting common-mode transients. Use Value: Input CMVR beyond rails enables direct connection to high-side shunts; 95 dB CMRR suppresses bus noise at 50/60 Hz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6644MM/NOPB | TSSOP-14 package with identical electrical specs; differs only in tape-and-reel packaging (MM vs MAX) and moisture sensitivity level (MSL 1 vs MSL 3). | Same functional use in PCB layout; MAX variant is standard reel for automated assembly, MM is smaller reel for prototyping. | Select LMH6644MAX/NOPB for volume production; LMH6644MM/NOPB for low-volume evaluation or hand-soldering. |
| OPA4350UA/2K5 | Lower bandwidth (38 MHz), lower slew rate (20 V/µs), but superior input offset (±125 µV typ vs ±1 mV), lower noise (7 nV/√Hz), and higher CMRR (110 dB). | Better for precision DC-coupled applications (e.g., strain gauge bridges); unsuitable for >10 MHz video or fast-settling ADC buffers. | Choose OPA4350UA/2K5 when DC accuracy dominates; LMH6644MAX/NOPB when speed, output drive, and video linearity are primary. |
Compared with LMH6644MM/NOPB, the LMH6644MAX/NOPB offers identical performance in a production-optimized reel format; versus OPA4350UA/2K5, it trades DC precision for 3.4× higher bandwidth and 6.5× faster slew rate - making it optimal for AC-coupled, high-speed signal paths where dynamic fidelity matters most.
Availability
LMH6644MAX/NOPB is available at Aetrix Electronics and suitable for ADC buffer amplifiers, portable video drivers, active filter stages, current sense buffers, and high-speed instrumentation requiring stable component supply across automotive, industrial, and medical electronics programs.
Supply support for LMH6644MAX/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-performance op-amps, data converters, and power management ICs.
The LMH664x family was designed specifically for high-speed, low-power analog signal conditioning in portable and space-constrained systems - balancing bandwidth, output drive, rail-to-rail operation, and video-grade linearity in a single platform.
FAQ
What supply voltage ranges does the LMH6644MAX/NOPB support?
The LMH6644MAX/NOPB operates from a single supply of 2.7 V to 12.8 V or dual supplies of ±1.35 V to ±6.4 V. At ±5 V, it achieves its full 130 MHz bandwidth and 130 V/µs slew rate. The input common-mode range extends 0.5 V beyond V− and 1 V from V+, while the output swings within 40 mV of either rail - making LMH6644MAX/NOPB ideal for both low-voltage battery-powered and traditional split-rail industrial designs.
Does the LMH6644MAX/NOPB require external compensation for stability?
No, the LMH6644MAX/NOPB is unity-gain stable and requires no external compensation components. Its voltage-feedback architecture maintains phase margin >45° across all gains (AV = +1 to +10) and load conditions (150 Ω to 2 kΩ), with typical peaking <2 dB. This is verified across temperature (−40°C to +85°C) and supply voltages (3 V, 5 V, ±5 V), so LMH6644MAX/NOPB can be deployed directly in active filters and gain stages without stability analysis overhead.
How does the LMH6644MAX/NOPB perform in video applications?
The LMH6644MAX/NOPB delivers broadcast-grade video performance: differential gain (DG) and differential phase (DP) are both 0.01% and 0.01° respectively into 150 Ω loads at NTSC frequencies. It sustains this linearity across the full output voltage range and under heavy loading, with −62 dBc THD at 5 MHz. These characteristics make LMH6644MAX/NOPB suitable for RGB, YUV, and composite video line driving in portable DVD players, medical imaging displays, and industrial vision systems.
Can the LMH6644MAX/NOPB drive 150 Ω video loads directly?
Yes, the LMH6644MAX/NOPB is rated for ±75 mA linear output current and maintains 0.01% DG/0.01° DP into 150 Ω loads at NTSC frequencies. Its rail-to-rail output swing (within 40 mV of rails) ensures full 2 VPP video signal compliance even on 3 V supplies. Output short-circuit protection (infinite duration at VS < 6 V) adds robustness against accidental shorts in video output circuitry - confirming LMH6644MAX/NOPB is engineered for direct 150 Ω video load driving without external buffers.
What is the settling time and accuracy of the LMH6644MAX/NOPB in ADC buffer applications?
The LMH6644MAX/NOPB settles to ±0.1% in 68 ns with an 8 pF capacitive load, enabling accurate sampling in 12-bit+ ADCs operating at ≥10 MSPS. Its −62 dBc THD at 5 MHz and 17 nV/√Hz input voltage noise preserve signal integrity, while rail-to-rail output swing prevents clipping on low-voltage supplies. These combined specs ensure LMH6644MAX/NOPB delivers ≤0.5 LSB error in high-resolution data acquisition systems - validated across 3 V, 5 V, and ±5 V supply conditions.
LMH6644MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 135V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 MHz
- Current - Input Bias:
- 1.6 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 2.7mA (x4 Channels)
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12.8 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LMH6644MAX/NOPB FAQ
1.How can I place an order for LMH6644MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6644MAX/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 LMH6644MAX/NOPB reliable?
The price and inventory of LMH6644MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6644MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6644MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6644MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6644MAX/NOPB?
LMH6644MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6644MAX/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 LMH6644MAX/NOPB?
For technical support, including LMH6644MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6644MAX/NOPB requirements.
6.How does Aetrix verify that LMH6644MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6644MAX/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 LMH6644MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6644MAX/NOPB?
All LMH6644MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6644MAX/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 LMH6644MAX/NOPB part is unused and in its original packaging.
Return procedure for LMH6644MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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