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Texas Instruments LMH6644 MDC
- Part No.:
- LMH6644 MDC
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
LMH6644 MDC.pdf
- Description:
- IC VOLTAGE FEEDBACK 4 CIRC DIE
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
LMH6644 MDC from Texas Instruments is a quad, rail-to-rail output voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning in precision analog systems. It delivers 130 MHz –3 dB bandwidth (±5 V), 130 V/µs slew rate, ±75 mA linear output current, and 40 mV from rails output swing - enabling high-fidelity ADC buffering and active filter design in portable video and current-sense applications.
For engineers reviewing the LMH6644 MDC datasheet, LMH6644 MDC pinout, LMH6644 MDC application, or LMH6644 MDC equivalent, key selection criteria include its 130-MHz bandwidth at ±5 V, 75-mA output drive capability, rail-to-rail output swing within 40 mV of supply rails, low 17 nV/√Hz input voltage noise at 100 kHz, and guaranteed performance across 2.7 V to 12.8 V single- or split-supply operation.
Technical Context
The LMH6644 MDC employs a voltage-feedback architecture with fully differential input stage and Class AB output stage, supporting stable closed-loop operation at gains ≥ +1 without external compensation. Its input common-mode range extends 0.5 V beyond V– and 1 V from V+, while output swing reaches within 40 mV of either rail under 2-kΩ load - critical for low-voltage dynamic range preservation.
Stability is ensured across supply voltages (2.7 V to 12.8 V) and loads (150 Ω to 2 kΩ), with 0.1-dB gain flatness up to 12 MHz (AV = +2, RL = 150 Ω) and minimal peaking (<2 dB). Settling time is 68 ns to ±0.1% for 2-VPP step, and overdrive recovery is 100 ns - confirming suitability for fast transient response in data acquisition paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3 dB Bandwidth | 130 MHz at ±5 V, AV = +1 - supports wideband signal chain front-ends up to UHF frequencies |
| Slew Rate | 130 V/µs (AV = –1) - maintains full-scale 2-VPP output at >20 MHz without slewing distortion |
| 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 or ±1.35 V to ±6.4 V split - enables use from battery-powered portables to industrial rails |
| Input Noise | 17 nV/√Hz at 100 kHz - preserves SNR in medium-bandwidth sensor and ADC buffer stages |
| THD | –62 dBc at 5 MHz, 2-VPP, AV = +2 - meets broadcast-grade video and high-fidelity instrumentation requirements |
| Settling Time | 68 ns to ±0.1% - ensures accurate sampling in 12-bit+ SAR and pipeline ADC interfaces |
Pinout & Package
LMH6644 MDC is available in SOIC-14 (8.64 mm × 3.91 mm) and TSSOP-14 (5.00 mm × 4.40 mm) packages. Both variants share identical pinout and thermal characteristics (RθJA = 145°C/W for SOIC, 155°C/W for TSSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Channel A output | Drives external load; rail-to-rail swing (40 mV from rails) enables maximum dynamic range |
| –IN A (Pin 2) | Channel A inverting input | Differential input node; supports DC-coupled feedback networks and unity-gain stable configurations |
| +IN A (Pin 3) | Channel A non-inverting input | High-impedance input (3 MΩ common-mode RIN); accepts signals from sensors or DACs |
| V+ (Pin 4) | Positive supply | Accepts 2.7–12.8 V single or positive rail of split supply; decoupling required per layout guidelines |
| +IN B (Pin 5) | Channel B non-inverting input | Independent input for second channel; no crosstalk degradation (47 dB @ 5 MHz) |
| –IN B (Pin 6) | Channel B inverting input | Matches Pin 2 electrical behavior; supports dual-channel active filtering |
| OUT B (Pin 7) | Channel B output | Electrically isolated from OUT A; same 75-mA drive and 40-mV rail margin |
| OUT C (Pin 8) | Channel C output | Third independent output; shares all AC/DC specs with OUT A/B/D |
| –IN C (Pin 9) | Channel C inverting input | Enables four-channel simultaneous signal conditioning without multiplexing latency |
| +IN C (Pin 10) | Channel C non-inverting input | Provides full quad-channel flexibility for multi-sensor or multi-path systems |
| V– (Pin 11) | Negative supply | Ground reference for single supply or negative rail for split supply; handles sinking currents up to 145 mA |
| +IN D (Pin 12) | Channel D non-inverting input | Final channel input; supports independent gain/offset configuration per channel |
| –IN D (Pin 13) | Channel D inverting input | Completes quad topology; matches input bias and offset specs across all channels |
| OUT D (Pin 14) | Channel D output | Fourth rail-to-rail output; enables compact 4× buffer, filter, or driver solutions |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 40 mV of either supply rail at 2-kΩ load - maximizes usable voltage range in 3-V and lower systems |
| Low distortion at high frequency | –62 dBc THD at 5 MHz, 2-VPP output - meets NTSC/PAL video and high-resolution data converter requirements |
| No phase reversal on CMVR exceedance | Output remains monotonic even when input exceeds common-mode range - prevents latch-up in overvoltage transients |
| Output short-circuit protection | Infinite duration protection below 6 V supply; 1.5-ms limit above 6 V - enhances system reliability without external current limiting |
| Wide supply voltage range | Operates from 2.7 V to 12.8 V - supports direct integration into legacy 5-V, modern 3.3-V, and high-voltage industrial rails |
Applications
| ADC Buffer Amplifier | Active Filter Stage |
|---|---|
Use Scenario: Driving the input of a 12-bit, 10-MSPS SAR ADC in a data acquisition module with ±5-V supplies. IC Role / Device Role / Timing Role: High-speed, low-noise buffer isolating ADC input from source impedance variations and providing full-scale 4-VPP swing. Use Value: 68-ns settling time and –62 dBc THD ensure <0.5-LSB integral nonlinearity error; rail-to-rail output avoids clipping at 4.9-V swing. | Use Scenario: Implementing a 4th-order Butterworth low-pass filter for ECG signal conditioning with 150-Ω output termination. IC Role / Device Role / Timing Role: Quad-channel op-amp configured as two 2-pole sections; each channel provides gain, pole placement, and drive capability. Use Value: 130-MHz bandwidth and 0.1-dB flatness to 12 MHz preserve signal integrity through filter passband; ±75-mA output sinks 150-Ω load without droop. |
| Portable Video Driver | Current-Sense Buffer |
Use Scenario: Driving composite video (NTSC) signal to 75-Ω coaxial cable in handheld medical imaging device powered by 3.3-V supply. IC Role / Device Role / Timing Role: Single-supply video line driver with DC restoration, gain = +2, and 0.01° differential phase accuracy. Use Value: Differential phase of 0.01° and gain of 0.01% at 150-Ω load meet broadcast video spec; 40-mV rail margin enables full 3.2-VPP swing on 3.3-V rail. | Use Scenario: Amplifying shunt voltage from 10-mΩ sense resistor in 20-A motor control H-bridge with ±5-V supplies. IC Role / Device Role / Timing Role: Precision, high-output-current buffer converting 200-mV shunt drop to 2-V signal for MCU ADC input. Use Value: ±75-mA output current drives long PCB traces and ADC input capacitance; 17-nV/√Hz noise minimizes current measurement uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6643MDC | Single-channel version with identical bandwidth (130 MHz), slew rate (130 V/µs), and output drive (±75 mA) | Used where only one high-speed channel is needed; saves board space but requires duplication for multi-channel designs | Select LMH6643MDC when system requires only one channel and board area is constrained |
| THS4631D | Single-channel, 180-MHz bandwidth, higher supply current (4.5 mA/channel), no rail-to-rail output (70-mV min swing) | Better bandwidth for ultra-wideband applications; unsuitable for low-voltage rail-limited systems due to larger output headroom | Choose THS4631D only when >130-MHz BW is mandatory and supply >±5 V is available |
Compared with LMH6643MDC and THS4631D, the LMH6644 MDC uniquely combines quad-channel integration, rail-to-rail output, and 130-MHz bandwidth in a single SOIC/TSSOP package - reducing component count and inter-channel skew in multi-signal systems without sacrificing drive strength or noise performance.
Availability
LMH6644 MDC is available at Aetrix Electronics and suitable for ADC buffering, active filtering, portable video driving, and current-sense amplification requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for LMH6644 MDC 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The LMH6644 MDC belongs to TI's high-speed precision op-amp product line, engineered specifically for applications demanding wide bandwidth, low distortion, high output current, and rail-to-rail operation in space-constrained, multi-channel systems.
FAQ
What is the maximum supply voltage for LMH6644 MDC?
The LMH6644 MDC supports an absolute maximum supply voltage of 13.5 V (V+ – V–), with recommended operating range from 2.7 V to 12.8 V. Operation at 12.8 V is fully characterized per datasheet Section 7.3, and thermal limits must be observed using RθJA values (145°C/W for SOIC, 155°C/W for TSSOP) to maintain junction temperature ≤150°C. The LMH6644 MDC remains functional and stable across this full range.
Does LMH6644 MDC support single-supply operation?
Yes, the LMH6644 MDC is explicitly designed for true single-supply operation down to 2.7 V. Its input common-mode range extends 0.5 V below V– (i.e., to –0.5 V when V– = 0 V) and 1 V from V+, while the output swings within 40 mV of both rails. This allows full-scale signal handling in 3-V systems - confirmed by 3-V electrical characteristics tables (Section 7.5) and typical performance curves in the LMH6644 MDC datasheet.
What is the output short-circuit protection behavior of LMH6644 MDC?
The LMH6644 MDC features internal output short-circuit protection rated for infinite duration at supply voltages <6 V (e.g., ±2.5 V, 3 V, 5 V) at room temperature and below. At VS >6 V (e.g., ±5 V, 12 V), allowable short-circuit duration is limited to 1.5 ms - per Note (2) in the Features section and Section 7.1 Absolute Maximum Ratings. This protection applies to both sourcing and sinking faults, and the LMH6644 MDC recovers automatically after fault removal.
Can LMH6644 MDC drive a 150-Ω load at full bandwidth?
Yes, the LMH6644 MDC is fully characterized driving 150-Ω loads. Its 0.1-dB gain flatness extends to 12 MHz at AV = +2 with RL = 150 Ω (Section 7.5), and it delivers ±75 mA linear output current - sufficient to sustain 2-VPP into 150 Ω (13.3 mA peak) with margin. THD remains –60 dBc at 5 MHz under these conditions (Section 7.6), confirming robust small- and large-signal performance into video-standard impedances.
Is LMH6644 MDC pin-compatible with other TI quad op-amps like OPA4684?
No, the LMH6644 MDC is not pin-compatible with OPA4684 or other TI quad op-amps. Its 14-pin SOIC/TSSOP pinout (per Section 6 of the datasheet) assigns dedicated inputs/outputs per channel in fixed order (e.g., OUT A = Pin 1, –IN A = Pin 2, +IN A = Pin 3, V+ = Pin 4), differing from OPA4684's pin mapping. Substitution requires PCB layout revision. Always verify pin functions against the LMH6644 MDC datasheet before replacement.
LMH6644 MDC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- Die
- Packaging:
- Tray
- 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:
- Die
LMH6644 MDC FAQ
1.How can I place an order for LMH6644 MDC through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6644 MDC 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 LMH6644 MDC reliable?
The price and inventory of LMH6644 MDC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6644 MDC is usually 5 days.
3.What payment methods are accepted for LMH6644 MDC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6644 MDC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6644 MDC?
LMH6644 MDC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6644 MDC 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 LMH6644 MDC?
For technical support, including LMH6644 MDC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6644 MDC requirements.
6.How does Aetrix verify that LMH6644 MDC is sourced from the original manufacturer or authorized distributors?
All LMH6644 MDC 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 LMH6644 MDC meets industry standards.
7.What is the process for return or replacement of LMH6644 MDC?
All LMH6644 MDC units undergo pre-shipment inspection (PSI). If there is an issue with LMH6644 MDC, 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 LMH6644 MDC part is unused and in its original packaging.
Return procedure for LMH6644 MDC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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