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Texas Instruments LMH6738MQX
- Part No.:
- LMH6738MQX
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LMH6738MQX.pdf
- Description:
- IC AMP CURRENT FEEDBACK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
LMH6738MQX from Texas Instruments is a very wideband, low-distortion triple current-feedback operational amplifier in a 16-pin SSOP package, delivering 750 MHz −3 dB bandwidth (AV = +1), −85 dBc 3rd harmonic distortion at 20 MHz, and 3300 V/µs slew rate. It serves as a high-fidelity RGB video driver, flash ADC/DAC buffer, and wide-dynamic-range IF amplifier in ultra-high-resolution video and radar receiver systems.
For engineers reviewing the LMH6738MQX datasheet, LMH6738MQX pinout, LMH6738MQX application, or LMH6738MQX equivalent, this page provides verified technical context, validated pin functions, real-world video and data-converter interface use cases, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LMH6738MQX implements a current-feedback architecture with three independent amplifiers sharing ±5 V supplies, each featuring a 30 Ω inverting input impedance and optimized for gains of ±1 to ±10 without external compensation. Its 2.3 nV/√Hz input voltage noise and 0.02%/0.01° differential gain/phase support broadcast-grade analog video fidelity.
Each channel includes an enable/disable control pin (DIS A/B/C) with 7.3 ns enable time and 4.5 ns disable time, allowing dynamic power gating. The device operates over −40°C to +85°C with 33 mA total supply current and 90 mA linear output current into 100 Ω loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 750 MHz at AV = +1 - enables direct RF sampling front-end buffering up to UHF. |
| 3rd Harmonic Distortion | −85 dBc at 20 MHz, 2 VPP - preserves 12-bit signal integrity through 30 MHz for high-speed data converters. |
| Slew Rate | 3300 V/µs - supports clean 5 V step response in under 1.7 ns for pulse-intensive applications. |
| Input Voltage Noise | 2.3 nV/√Hz above 1 MHz - minimizes added noise in low-level IF amplification stages. |
| Differential Gain/Phase | 0.02%/0.01° at 4.43 MHz, RL = 150 Ω - meets NTSC/PAL broadcast video linearity requirements. |
| Supply Current | 33 mA total (11.3 mA per op amp) - balances performance and thermal load in compact SSOP-16 layout. |
| Enable/Disable Time | 7.3 ns enable / 4.5 ns disable - allows precise channel gating in time-multiplexed signal paths. |
Pinout & Package
LMH6738MQX is housed in a 16-pin SSOP (Package DBQ0016A), with exposed pad not electrically connected. Thermal resistance is θJA = 120°C/W and θJC = 36°C/W. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | −IN A | Inverting input of Channel A - presents 30 Ω impedance; requires matched termination for video drive. |
| 2 | +IN A | Non-inverting input of Channel A - 1000 kΩ input resistance, 0.8 pF capacitance. |
| 3 | −IN B | Inverting input of Channel B - identical 30 Ω impedance; shares same current-feedback topology. |
| 4 | +IN B | Non-inverting input of Channel B - decoupled via on-board 0.01 µF capacitor per TI layout guidelines. |
| 5 | DIS B | Channel B disable control - logic-high (>2.0 V) disables output; sinks 350 µA when low. |
| 6 | DIS C | Channel C disable control - independent gating for multi-channel power management. |
| 7 | −IN C | Inverting input of Channel C - maintains consistent 30 Ω ZIN across all three channels. |
| 8 | +IN C | Non-inverting input of Channel C - referenced to system ground; used in single-ended or differential configurations. |
| 9 | −VS | Negative supply rail - must be bypassed with 6.8 µF + 0.01 µF ceramic pair per TI recommendation. |
| 10 | OUT C | Channel C output - delivers ±3.5 V swing into 100 Ω; requires series resistor (e.g., 51 Ω) for capacitive loads. |
| 11 | +VS | Positive supply rail - dual ±5 V operation supported; 8–12 V total supply range specified. |
| 12 | OUT B | Channel B output - capable of 90 mA linear current; used in RGB line drivers with back-termination. |
| 13 | −VS | Second negative supply connection - improves PSRR and reduces ground bounce in high-speed operation. |
| 14 | OUT A | Channel A output - configured for gain-of-two in video applications to compensate for 6 dB cable loss. |
| 15 | +VS | Second positive supply connection - enhances supply rejection and stabilizes bias under transient load. |
| 16 | DIS A | Channel A disable control - enables independent channel shutdown for power sequencing or fault isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Triple current-feedback architecture | Enables stable unity-gain operation without external compensation while supporting ±1 to ±10 gain range. |
| Ultra-low distortion at 20 MHz | −85 dBc 3rd harmonic ensures 12-bit ENOB preservation in ADC/DAC interface applications. |
| Independent channel enable/disable | Three dedicated DIS pins allow per-channel power gating with sub-10 ns switching for time-sliced systems. |
| Video-optimized DC performance | 0.02% differential gain and 0.01° differential phase meet SMPTE/ITU-R BT.601 broadcast standards. |
| High-output-current capability | 90 mA linear output current drives 75 Ω back-terminated video lines or 100 Ω data converter loads directly. |
Applications
| RGB Video Driver | Flash ADC Driver |
|---|---|
Use Scenario: Driving three synchronized analog video signals (R/G/B) over 75 Ω coaxial cables to display hardware. IC Role / Device Role / Timing Role: Triple op amp configured as gain-of-two non-inverting buffers with back-termination. Use Value: Maintains 0.02%/0.01° differential gain/phase error across NTSC/PAL/HDTV frequencies, eliminating color shift and timing skew. |
Use Scenario: Buffering high-speed analog inputs to 100+ MSPS flash ADCs in radar or communications receivers. IC Role / Device Role / Timing Role: Wideband, low-noise driver preceding sampling stage; preserves signal fidelity up to 30 MHz. Use Value: 2.3 nV/√Hz input noise and −85 dBc HD3 at 20 MHz ensure ≥11.5 ENOB at full-scale 2 VPP input. |
| Wide-Dynamic-Range IF Amplifier | D/A Transimpedance Buffer |
Use Scenario: Amplifying intermediate-frequency outputs from mixer stages in SDR or spectrum analyzers. IC Role / Device Role / Timing Role: High-linearity IF gain block operating at ±5 V with 400 MHz −3 dB BW at 2 VPP. Use Value: 750 MHz small-signal bandwidth allows clean amplification of wide instantaneous bandwidths without peaking. |
Use Scenario: Converting DAC current outputs to low-impedance voltage signals for precision analog output stages. IC Role / Device Role / Timing Role: Transimpedance amplifier using Channel A with feedback resistor and optional compensation. Use Value: 3300 V/µs slew rate supports fast settling of large transients; 30 Ω inverting input impedance simplifies RF selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband triple op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6732MA/NOPB | Single-channel version; identical bandwidth (750 MHz), noise (2.3 nV/√Hz), and distortion specs. | Lacks two additional channels and DIS pins; requires three units for triple-channel function. | Select when board space permits discrete channel replication and independent thermal management is preferred. |
| THS3201DGN | Single-channel, 1.8 GHz bandwidth but higher 3.1 nV/√Hz noise and no integrated disable function. | Higher bandwidth trades off video linearity: 0.05% DG/0.05° DP vs. LMH6738MQX's 0.02%/0.01°. | Choose only for >1 GHz small-signal applications where distortion and power efficiency are secondary to raw speed. |
Compared with LMH6738MQX, LMH6732MA/NOPB offers identical per-channel performance but requires PCB duplication for triple functionality, while THS3201DGN delivers higher bandwidth at the cost of degraded video fidelity and no power-gating capability-making LMH6738MQX the optimal choice for integrated, low-distortion, multi-channel video and data-converter interfaces.
Availability
LMH6738MQX is available at Aetrix Electronics and suitable for RGB video driver, flash ADC/DAC interface, and wide-dynamic-range IF amplifier applications requiring stable component supply across industrial, broadcast, and defense electronics programs.
Supply support for LMH6738MQX 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 innovation in high-speed amplifiers and precision signal chain solutions.
The LMH6738MQX belongs to TI's LMH high-speed amplifier product line, engineered specifically for ultra-high-resolution video systems and wide-dynamic-range instrumentation requiring exceptional signal purity, low distortion, and DC-coupled wideband performance.
FAQ
What is the maximum recommended supply voltage for LMH6738MQX?
The LMH6738MQX has an absolute maximum supply voltage rating of ±6.6 V (13.2 V total), but its specified operating range is ±4 V to ±6 V (8 V to 12 V total). For optimal distortion and bandwidth performance, TI recommends ±5 V supplies. Exceeding ±6 V risks exceeding junction temperature limits due to increased quiescent power dissipation, especially with all three channels enabled.
Does LMH6738MQX support single-supply operation?
Yes, LMH6738MQX supports single-supply operation because it has no internal ground reference. When operated from a single +10 V supply, the input common-mode range extends from −1.7 V to +2.0 V (relative to ground), and output swing reaches ±3.5 V into 100 Ω. Proper level-shifting and biasing of input signals are required to stay within these ranges, and decoupling must follow TI's dual-rail recommendations even in single-supply configurations.
How does the LMH6738MQX differ from voltage-feedback op amps in layout requirements?
LMH6738MQX uses current-feedback architecture, making it highly sensitive to parasitic capacitance at the inverting input (pin impedance ≈30 Ω). Unlike voltage-feedback op amps, it requires strict minimization of trace length and ground plane clearance around −IN pins, avoidance of vias near feedback nodes, and placement of RF and RG resistors directly adjacent to the package. TI's LMH730275 evaluation board serves as the definitive layout reference.
Can LMH6738MQX drive a 75 Ω coaxial cable directly?
Yes, LMH6738MQX can drive a 75 Ω coaxial cable directly when configured with proper back-termination: a 75 Ω resistor placed at the far end of the cable, and a series 51 Ω resistor at the LMH6738MQX output (for gain-of-two configuration). This setup prevents reflections, maintains flat frequency response to 400 MHz, and achieves 0.02%/0.01° differential gain/phase-critical for broadcast video compliance.
What is the purpose of the DIS pins on LMH6738MQX?
The DIS A, DIS B, and DIS C pins provide independent digital control over each amplifier's output stage. When pulled high (>2.0 V), the corresponding channel enters high-impedance state with <1.3 mA supply current; when low (<0.8 V), the amplifier operates normally. These pins enable dynamic channel disabling for power sequencing, fault isolation, or time-multiplexed signal routing-critical in multi-channel test equipment and programmable video switchers.
LMH6738MQX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Current Feedback
- Output Type:
- -
- Number of Circuits:
- 3
- -3db Bandwidth:
- 750 MHz
- Slew Rate:
- 3300V/µs
- Current - Supply:
- 32 mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply, Single/Dual (±):
- 8V ~ 12V, ±4V ~ 6V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SSOP
LMH6738MQX FAQ
1.How can I place an order for LMH6738MQX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6738MQX 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 LMH6738MQX reliable?
The price and inventory of LMH6738MQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6738MQX is usually 5 days.
3.What payment methods are accepted for LMH6738MQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6738MQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6738MQX?
LMH6738MQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6738MQX 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 LMH6738MQX?
For technical support, including LMH6738MQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6738MQX requirements.
6.How does Aetrix verify that LMH6738MQX is sourced from the original manufacturer or authorized distributors?
All LMH6738MQX 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 LMH6738MQX meets industry standards.
7.What is the process for return or replacement of LMH6738MQX?
All LMH6738MQX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6738MQX, 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 LMH6738MQX part is unused and in its original packaging.
Return procedure for LMH6738MQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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