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Texas Instruments LMH6683MT
- Part No.:
- LMH6683MT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMH6683MT.pdf
- Description:
- IC OPAMP VFB 3 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
LMH6683MT from Texas Instruments is a triple, high-speed, single-supply voltage-feedback operational amplifier optimized for video signal conditioning. It delivers 190MHz −3dB bandwidth (A = +2, ±5V), 940V/μs slew rate, 0.01% differential gain error, and 0.08° differential phase error at NTSC 3.58MHz - enabling precision composite video amplification in portable and embedded systems.
For engineers reviewing the LMH6683MT datasheet, LMH6683MT pinout, LMH6683MT application, or LMH6683MT equivalent, this page provides verified technical context, real-world video-system design constraints, package-specific thermal and layout guidance, and validated alternative options for dual- and triple-channel video buffer replacement.
Technical Context
The LMH6683MT uses a voltage-feedback topology with a class-AB input stage that delivers exponential current to the Miller compensation capacitor, enabling higher slew rate at large differential inputs - unlike conventional saturated-input op-amps. Its input common-mode range extends 0.5V beyond V− and to within 1.7V of V+, supporting rail-to-rail input operation under single-supply conditions.
Output swing reaches within 0.8V of either rail into 2kΩ, and it drives ±85/−80mA output current while maintaining <0.01% DG and <0.08° DP at NTSC frequencies. The device is fabricated in TI's VIP10 process, balancing speed (190MHz BW) and quiescent current (6.5mA/amp) for power-sensitive video front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 190MHz at A = +2, ±5V supply - supports full NTSC/PAL baseband video without attenuation. |
| Slew Rate | 940V/μs - enables distortion-free reproduction of fast video transients (e.g., sync pulses, chroma bursts). |
| Differential Gain Error | 0.01% (NTSC 3.58MHz, RL = 150Ω) - preserves color saturation accuracy across cascaded video stages. |
| Differential Phase Error | 0.08° (NTSC 3.58MHz, RL = 150Ω) - maintains hue fidelity and avoids color shift in analog video chains. |
| Supply Current per Channel | 6.5mA (typ.) - allows triple-channel video buffering in battery-powered portable devices with low thermal load. |
| Input Common-Mode Range | Extends 0.5V below V− and to within 1.7V of V+ - supports DC-coupled video input with ground-referenced sources. |
| Output Voltage Swing | Within 0.8V of rails into 2kΩ - maximizes dynamic range for 1Vpp–2Vpp video signals on 5V single supply. |
Pinout & Package
TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, thermally enhanced pad, rated for −40°C to +85°C operation. Thermal resistance θJA = 155°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Ch1) | High-impedance node for feedback network connection; supports stable gain ≥ −1 or ≥ +2. |
| 2 | Non-Inverting Input (Ch1) | Accepts input signal down to 0.5V below V−; immune to phase reversal during overdrive. |
| 3 | Output (Ch1) | Capable of ±85/−80mA drive into 75Ω/150Ω video loads; swing limited to 0.8V from rails. |
| 4 | V− (GND for single supply) | Reference for all channels; must be low-impedance; ties to system ground or negative rail. |
| 5 | Non-Inverting Input (Ch2) | Independent channel input; identical CMVR and noise specs as Ch1. |
| 6 | Inverting Input (Ch2) | Feedback node for Ch2; supports unity-gain stable configuration per channel. |
| 7 | Output (Ch2) | Electrically isolated output; no crosstalk >77dB at 5MHz between adjacent channels. |
| 8 | NC | No internal connection; leave unconnected or tie to GND for mechanical stability. |
| 9 | Output (Ch3) | Third independent video buffer output; same AC/DC performance as Ch1/Ch2. |
| 10 | Inverting Input (Ch3) | Feedback terminal for Ch3; supports standard video gain configurations (e.g., +2, −1). |
| 11 | Non-Inverting Input (Ch3) | DC-coupled input capable of accepting video sync tip at 0V with 0.5V headroom below V−. |
| 12 | V+ | Positive supply rail (3V to 12V); requires local 0.1μF ceramic + 4.7μF tantalum decoupling. |
| 13 | NC | No internal connection; do not route signals or apply voltage. |
| 14 | Thermal Pad | Internally connected to V−; must be soldered to PCB ground plane for thermal and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Immunity to output phase reversal | Guaranteed under input overvoltage conditions - eliminates need for external clamping diodes in servo or video sync circuits. |
| Video-optimized AC performance | 0.01% DG / 0.08° DP at NTSC 3.58MHz ensures color fidelity across multi-stage analog video paths. |
| Class-AB input stage | Delivers exponential slew current - sustains 940V/μs even at large differential inputs, avoiding slewing-induced distortion. |
| Single-supply operation | Input CMVR extends 0.5V below V− and output swings to within 0.8V of rails - enables true DC-coupled 5V video buffers. |
| Low crosstalk between channels | −78dB at 5MHz - prevents interference between RGB or Y/C signal paths in triple-buffer applications. |
Applications
| Composite Video Amplifier | ADC Front-End Buffer |
|---|---|
|
Use Scenario: Amplifying NTSC/PAL composite video signals before distribution to multiple displays or digitization. IC Role / Device Role / Timing Role: Triple-channel video driver providing simultaneous Y, C, and sync amplification with matched gain/phase response. Use Value: 0.01% DG and 0.08° DP preserve color accuracy across all three channels without calibration overhead. |
Use Scenario: Driving SAR or pipeline ADC inputs in portable test equipment requiring wideband, low-distortion analog front-ends. IC Role / Device Role / Timing Role: High-slew-rate buffer isolating source impedance from ADC sampling capacitance and reducing harmonic distortion. Use Value: 940V/μs slew rate and 190MHz bandwidth support clean acquisition of fast-rising video or communication waveforms. |
| Portable Video Interface | Current-Sense Signal Conditioning |
|
Use Scenario: Level-shifting and amplifying camera sensor outputs (e.g., CCD/CMOS analog video) in handheld medical or industrial imagers. IC Role / Device Role / Timing Role: Single-supply triple op-amp providing rail-to-rail input/output swing and low quiescent current for battery longevity. Use Value: 6.5mA/amp supply current and 0.8V rail headroom enable 5V-powered video processing with minimal heat dissipation. |
Use Scenario: Amplifying low-voltage shunt resistor signals in motor control or power supply monitoring where fast transient response is critical. IC Role / Device Role / Timing Role: Precision buffer with high CMRR (84dB) and wide input CMVR (−5.5V to +2.8V) for bidirectional current sensing. Use Value: Immunity to phase reversal prevents false fault triggering during current overload or polarity reversal events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-channel high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6683MA | SOIC-14 package; θJA = 145°C/W vs. TSSOP-14's 155°C/W; identical electrical specs. | Preferred for through-hole prototyping or legacy board compatibility; larger footprint but easier hand-soldering. | Select LMH6683MA when thermal margin >10°C is required or SOIC-14 footprint is already allocated. |
| THS3203D | Triple 1.8GHz current-feedback op-amp; higher bandwidth but requires external compensation; 12mA/amp supply current. | Better for >100MHz RF/IF signal paths; unsuitable for DC-coupled video due to limited input CMVR (−2.5V to +1.5V). | Choose THS3203D only for ultra-wideband non-video applications where gain-bandwidth product >500MHz is mandatory. |
Compared with LMH6683MA and THS3203D, the LMH6683MT offers optimal balance of video-grade linearity (0.01% DG), single-supply usability (0.5V beyond V−), and compact TSSOP-14 packaging - making it the preferred choice for space-constrained, battery-operated video systems requiring guaranteed NTSC/PAL fidelity.
Availability
LMH6683MT is available at Aetrix Electronics and suitable for portable video interfaces, ADC front-end buffering, and current-sense signal conditioning requiring stable component supply across industrial and medical OEM programs.
Supply support for LMH6683MT 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-speed op-amp design for video, communications, and industrial signal chains.
The LMH6683MT belongs to TI's LMH66xx video op-amp family, engineered specifically for analog video signal integrity - emphasizing differential gain/phase accuracy, rail-to-rail input/output, and immunity to phase reversal in real-world video systems.
FAQ
What is the maximum operating supply voltage for the LMH6683MT?
The LMH6683MT supports a total supply voltage (V+ − V−) up to 12.6V, with recommended operating range of 3V to 12V. At ±5V (10V total), it achieves its specified 190MHz bandwidth and 940V/μs slew rate. Operation above 12.6V risks permanent damage per Absolute Maximum Ratings.
Does the LMH6683MT support true single-supply operation with DC-coupled inputs?
Yes. The LMH6683MT accepts input voltages down to 0.5V below V− (e.g., −0.5V when V− = 0V), enabling direct connection to ground-referenced video sources. Its output swings to within 0.8V of both rails into 2kΩ, making it fully compatible with 5V single-supply DC-coupled video buffer designs.
How does the LMH6683MT prevent phase reversal during input overvoltage?
The LMH6683MT uses an input stage architecture immune to transistor saturation-induced phase reversal. When inputs exceed the common-mode range, the output clamps predictably to the nearest rail instead of inverting - a critical feature for video sync detection and servo control loops where phase inversion causes system instability.
Can the LMH6683MT drive a 75Ω video load while maintaining differential gain accuracy?
Yes. Tested at RL = 150Ω to 0V (standard for NTSC video), the LMH6683MT delivers 0.01% differential gain error. While driving 75Ω increases output current demand, its ±85/−80mA capability and 0.8V rail headroom ensure full compliance - confirmed by TI's Electrical Characteristics table showing VO(H)/VO(L) specifications at RL = 75Ω.
Is the thermal pad on the LMH6683MT TSSOP-14 package electrically connected?
Yes. The exposed thermal pad on the LMH6683MT is internally connected to V− (pin 4). It must be soldered to a PCB copper pour tied to the system ground plane to achieve rated θJA = 155°C/W and ensure reliable operation at full output current and ambient temperatures up to +85°C.
LMH6683MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 3
- Output Type:
- -
- Slew Rate:
- 940V/µs
- Gain Bandwidth Product:
- 120 MHz
- -3db Bandwidth:
- 190 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 6.5mA (x3 Channels)
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LMH6683MT FAQ
1.How can I place an order for LMH6683MT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6683MT 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 LMH6683MT reliable?
The price and inventory of LMH6683MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6683MT is usually 5 days.
3.What payment methods are accepted for LMH6683MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6683MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6683MT?
LMH6683MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6683MT 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 LMH6683MT?
For technical support, including LMH6683MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6683MT requirements.
6.How does Aetrix verify that LMH6683MT is sourced from the original manufacturer or authorized distributors?
All LMH6683MT 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 LMH6683MT meets industry standards.
7.What is the process for return or replacement of LMH6683MT?
All LMH6683MT units undergo pre-shipment inspection (PSI). If there is an issue with LMH6683MT, 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 LMH6683MT part is unused and in its original packaging.
Return procedure for LMH6683MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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