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Texas Instruments LMH6644MT/NOPB
- Part No.:
- LMH6644MT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMH6644MT/NOPB.pdf
- Description:
- IC OPAMP VFB 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,161
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Product details
Overview
LMH6644MT/NOPB from Texas Instruments is a quad-channel, rail-to-rail output voltage feedback operational amplifier optimized for low-power, high-speed signal conditioning in single- or split-supply systems. It delivers 130 MHz −3 dB bandwidth (±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 interfaces, and active filter stages.
For engineers reviewing the LMH6644MT/NOPB datasheet, LMH6644MT/NOPB pinout, LMH6644MT/NOPB application, or LMH6644MT/NOPB equivalent, key selection criteria include guaranteed 130 MHz bandwidth at ±5 V, differential gain/phase < 0.01% / 0.01° for NTSC video, THD of −62 dBc at 5 MHz, and TSSOP-14 package compatibility with space-constrained industrial and portable designs.
Technical Context
The LMH6644MT/NOPB employs a voltage-feedback architecture with fully differential input stage and Class AB rail-to-rail output stage, supporting stable operation across gains ≥ +1 with minimal peaking (< 2 dB) under 150 Ω loads. Its input common-mode range extends 0.5 V beyond V− and 1 V from V+, while output swings to within 40 mV of either rail.
It is characterized across 2.7 V to 12.8 V supply ranges, with full electrical specs validated at 3 V, 5 V, and ±5 V. The device features no output phase reversal when CMVR is exceeded, integrated short-circuit protection (infinite duration below 6 V), and 68 ns settling time to ±0.1% for 2 VPP steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 130 MHz at ±5 V, AV = +1 - supports wideband signal acquisition up to ~100 MHz without gain roll-off |
| Slew Rate | 130 V/µs (AV = −1) - maintains 2 VPP full-scale output at >40 MHz without slewing distortion |
| Output Current | ±75 mA linear drive - directly drives 150 Ω video loads or multiple 10 kΩ inputs without external buffers |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - preserves SNR in low-level sensor or audio preamp stages |
| THD @ 5 MHz | −62 dBc (RL = 2 kΩ, VO = 2 VPP, AV = +2) - meets broadcast-grade video fidelity requirements |
| Supply Current | 2.7 mA per channel (no load) - enables quad-channel analog signal path in battery-powered devices |
| Differential Gain/Phase | 0.01% / 0.01° (NTSC, RL = 1 kΩ) - ensures color fidelity in composite video amplification |
Pinout & Package
TSSOP-14 package (5.00 mm × 4.40 mm body size), thermally enhanced for continuous operation at 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No Connection | Unused pins; must be left floating or tied to ground per layout best practice |
| 2, 6, 9, 13 | Inverting Input (ChA–ChD) | Differential input terminals accepting signals referenced to local ground or common-mode bias |
| 3, 5, 10, 12 | Non-inverting Input (ChA–ChD) | Positive input nodes; support DC-coupled or AC-coupled configurations with bias network |
| 4, 7, 8, 14 | Output (ChA–ChD) | Rail-to-rail outputs capable of sourcing/sinking ±75 mA into resistive or capacitive loads |
| 11 | Negative Supply (V−) | Reference for dual-supply operation; accepts 0 V (single-supply) or −5 V (split-supply) |
| 4 | Positive Supply (V+) | Primary power rail; operates from 2.7 V to 12.8 V total supply range |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 40 mV of V+ or V− - maximizes dynamic range in low-voltage (3 V) data acquisition systems |
| Input CMVR extension | 0.5 V beyond V− and 1 V from V+ - enables direct interfacing with sensors or DACs operating near supply rails |
| No output phase reversal | Guaranteed behavior beyond CMVR - eliminates latch-up risk in overdriven instrumentation front-ends |
| Short-circuit protection | Infinite duration at VS < 6 V - allows safe operation during hot-plug or transient fault conditions |
| 0.1 dB gain flatness | Up to 12 MHz into 150 Ω - ensures amplitude accuracy across video baseband spectrum |
Applications
| ADC Buffer Amplifier | Portable Video Driver |
|---|---|
Use Scenario: Driving SAR or sigma-delta ADC inputs with fast-settling, low-distortion signals in handheld test equipment. IC Role / Device Role / Timing Role: High-fidelity unity-gain buffer isolating source impedance and maintaining full-scale bandwidth. Use Value: 68 ns settling time and −62 dBc THD ensure accurate digitization of 5 MHz analog waveforms without post-processing correction. |
Use Scenario: Amplifying composite NTSC/PAL video signals in battery-powered media players and digital cameras. IC Role / Device Role / Timing Role: Line driver delivering broadcast-compliant differential gain/phase performance into 75 Ω coaxial loads. Use Value: 0.01% DG / 0.01° DP at 1 kΩ load preserves color saturation and hue accuracy across full output swing. |
| Active Low-Pass Filter | Current Sense Buffer |
Use Scenario: Implementing 2nd-order Sallen-Key filters in motor control feedback loops requiring >10 MHz cutoff. IC Role / Device Role / Timing Role: High-speed op-amp configured as gain-stable filter stage with minimal group delay variation. Use Value: 130 MHz bandwidth and <2 dB peaking enable sharp roll-off with predictable phase response up to 12 MHz. |
Use Scenario: Isolating and scaling shunt voltage signals in 48 V telecom power supplies with isolated sensing requirements. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with rail-to-rail output for wide dynamic range. Use Value: Input CMVR extending 0.5 V below V− allows direct connection to low-side shunts referenced to system ground. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, rail-to-rail output amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6643MM/NOPB | Dual-channel version in VSSOP-8; identical electrical specs per channel but half the channel count | Preferred for space-constrained dual-amplifier functions where quad density is unnecessary | Select when BOM consolidation or PCB real estate favors dual-channel implementation |
| OPA2350UA/2K5 | Lower bandwidth (38 MHz), lower slew rate (22 V/µs), but lower noise (7 nV/√Hz) and higher PSRR (106 dB) | Better suited for precision DC-coupled sensor interfaces than wideband video or ADC buffering | Choose for low-noise, low-drift applications where speed < 40 MHz suffices |
Compared with LMH6644MT/NOPB, LMH6643MM/NOPB offers identical per-channel performance in half the footprint, while OPA2350UA/2K5 trades bandwidth for superior DC precision and noise - making LMH6644MT/NOPB optimal for video, high-speed data acquisition, and active filtering where full 130 MHz capability is required.
Availability
LMH6644MT/NOPB is available at Aetrix Electronics and suitable for ADC buffer amplifiers, portable video drivers, active low-pass filters, and current sense buffers requiring stable component supply across industrial temperature range (−40°C to +85°C) and long-term production continuity.
Supply support for LMH6644MT/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 over 90 years of innovation in high-performance signal chain solutions.
The LMH664x family was designed specifically for low-power, high-fidelity analog signal conditioning in portable and industrial systems - emphasizing rail-to-rail output drive, video-grade linearity, and robust operation across wide supply and temperature ranges.
FAQ
What supply voltage range does the LMH6644MT/NOPB support?
The LMH6644MT/NOPB operates from a total supply voltage range of 2.7 V to 12.8 V, supporting both single-supply (e.g., 3 V, 5 V) and split-supply (e.g., ±5 V, ±2.5 V) configurations. At ±5 V, it achieves its maximum 130 MHz −3 dB bandwidth and 130 V/µs slew rate. The LMH6644MT/NOPB maintains full functionality across the entire industrial temperature range (−40°C to +85°C) under all specified supply conditions.
Does the LMH6644MT/NOPB require external compensation for stability?
No, the LMH6644MT/NOPB is internally compensated for unity-gain stability (AV ≥ +1) across all load conditions up to 150 Ω. Its frequency response exhibits less than 2 dB peaking even under heavy loads, and it achieves 0.1 dB gain flatness up to 12 MHz into 150 Ω. The LMH6644MT/NOPB requires no external compensation components for standard closed-loop configurations, simplifying design and reducing bill-of-materials cost.
What is the output short-circuit protection behavior of the LMH6644MT/NOPB?
The LMH6644MT/NOPB provides output short-circuit protection with infinite allowable duration when total supply voltage (VS) is below 6 V at room temperature or below. For VS > 6 V, the maximum safe short-circuit duration is 1.5 ms. This protection applies to both sourcing and sinking modes and is fully characterized in the datasheet's Absolute Maximum Ratings and Electrical Characteristics sections. The LMH6644MT/NOPB remains functional after fault clearance without latch-up or parameter degradation.
Can the LMH6644MT/NOPB drive 75 Ω video loads directly?
Yes, the LMH6644MT/NOPB is explicitly characterized for 150 Ω loads and delivers 0.01% differential gain and 0.01° differential phase error under those conditions - meeting broadcast video specifications. While not tested at exactly 75 Ω, its ±75 mA linear output current and rail-to-rail swing allow direct driving of 75 Ω loads with minor gain adjustment (e.g., AV = +2) and proper termination. The LMH6644MT/NOPB maintains stability and low distortion in this configuration, as confirmed by typical performance curves showing flat gain response into 150 Ω.
How does the LMH6644MT/NOPB perform in single-supply 3 V applications?
In 3 V single-supply operation (V+ = 3 V, V− = 0 V), the LMH6644MT/NOPB delivers 115 MHz −3 dB bandwidth, 40 MHz full-power bandwidth, and 90 V/µs typical slew rate. Output swing reaches 2.98 VPP (high) and 75 mV above ground (low), preserving >95% of dynamic range. Its 2.7 mA per-channel quiescent current enables efficient use in battery-powered systems. All key parameters - including THD (−48 dBc), DG/DP, and settling time (68 ns) - are fully specified and tested at 3 V in the official datasheet.
LMH6644MT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
LMH6644MT/NOPB FAQ
1.How can I place an order for LMH6644MT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6644MT/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 LMH6644MT/NOPB reliable?
The price and inventory of LMH6644MT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6644MT/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6644MT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6644MT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6644MT/NOPB?
LMH6644MT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6644MT/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 LMH6644MT/NOPB?
For technical support, including LMH6644MT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6644MT/NOPB requirements.
6.How does Aetrix verify that LMH6644MT/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6644MT/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 LMH6644MT/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6644MT/NOPB?
All LMH6644MT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6644MT/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 LMH6644MT/NOPB part is unused and in its original packaging.
Return procedure for LMH6644MT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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