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Texas Instruments LMH6738MQ
- Part No.:
- LMH6738MQ
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LMH6738MQ.pdf
- Description:
- IC AMP CURRENT FEEDBACK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,202
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Product details
Overview
LMH6738MQ 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 small-signal bandwidth (AV = +1), −85 dBc 3rd harmonic distortion at 20 MHz, and 3300 V/µs slew rate. It operates from ±5 V supplies, supports gains of ±1 to ±10 without external compensation, and is optimized for RGB video drivers, flash ADC/DAC interfaces, and wide-dynamic-range IF amplification.
For engineers reviewing the LMH6738MQ datasheet, LMH6738MQ pinout, LMH6738MQ application, or LMH6738MQ 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 LMH6738MQ implements a current-feedback architecture with three independent high-speed amplifiers sharing common ±VS rails and individual disable pins (DIS A/B/C). Each channel features a 30 Ω inverting input impedance, 1000 kΩ non-inverting input resistance, and 0.05 Ω output impedance, enabling stable unity-gain operation with 549 Ω feedback resistors.
It delivers 400 MHz −3 dB bandwidth at AV = +2 (2 VPP, RL = 150 Ω), 0.02%/0.01° differential gain/phase for NTSC/PAL video, and 2.3 nV/√Hz input voltage noise - all while maintaining 90 mA linear output current and 7.3 ns enable time per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 750 MHz at AV = +1 - enables direct RF sampling front-end buffering without intermediate gain stages |
| Slew Rate | 3300 V/µs - supports clean 2 VPP step response with sub-nanosecond rise/fall times (0.9 ns) |
| 3rd Harmonic Distortion | −85 dBc at 20 MHz - preserves signal fidelity in 12-bit ADC/DAC interfaces up to 30 MHz |
| Differential Gain/Phase | 0.02%/0.01° at 4.43 MHz, RL = 150 Ω - meets broadcast-grade RGB video line-driver requirements |
| Supply Current | 33 mA total (11.3 mA per op amp) - balances ultra-high speed with manageable thermal load in SSOP-16 |
| Input Noise Voltage | 2.3 nV/√Hz above 1 MHz - minimizes added noise in wideband IF amplifiers and radar receivers |
| Enable/Disable Time | 7.3 ns enable / 4.5 ns disable - supports fast channel gating in time-interleaved systems |
Pinout & Package
LMH6738MQ 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 - 30 Ω impedance; requires matched layout to minimize parasitic capacitance |
| 2 | +IN A | Non-inverting input of Channel A - 1000 kΩ resistance; high-impedance node for DC-coupled video sources |
| 3 | −IN B | Inverting input of Channel B - identical 30 Ω impedance; isolated from other channels to limit crosstalk (−80 dB at 10 MHz) |
| 4 | +IN B | Non-inverting input of Channel B - independent high-Z path for multi-channel analog signal routing |
| 5 | DIS B | Channel B disable control - active-high; ≥2.0 V enables, ≤0.8 V disables; draws ±350 µA bias current |
| 6 | DIS C | Channel C disable control - independent gating for power sequencing in multi-amplifier systems |
| 7 | −IN C | Inverting input of Channel C - maintains consistent 30 Ω input Z across all three channels |
| 8 | +IN C | Non-inverting input of Channel C - supports simultaneous triple-channel DC-coupled signal conditioning |
| 9 | −VS | Negative supply rail - shared by all three amplifiers; requires local 0.01 µF + 6.8 µF decoupling |
| 10 | OUT C | Output of Channel C - capable of 90 mA linear drive into 100 Ω; series resistor (e.g., 24 Ω) recommended for >5 pF capacitive loads |
| 11 | +VS | Positive supply rail - shared rail; multiple V+ pins (11, 13) reduce supply impedance and improve PSRR |
| 12 | OUT B | Output of Channel B - same drive capability as OUT C; layout symmetry critical to maintain channel-to-channel matching |
| 13 | −VS | Second negative supply connection - reduces ground bounce and improves CMRR (46–50 dB) |
| 14 | OUT A | Output of Channel A - full 90 mA linear output current; supports back-terminated 75 Ω video loads with 2× gain |
| 15 | +VS | Second positive supply connection - enhances supply rejection (PSRR+ = 53 dB, PSRR− = 50 dB) |
| 16 | DIS A | Channel A disable control - enables independent power-down of RGB red channel or primary signal path |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables stable unity-gain operation without external compensation and supports gain range ±1 to ±10 via feedback resistor tuning |
| Triple independent amplifiers | Three fully isolated channels with individual disable pins allow selective activation for dynamic power management in RGB or I/Q systems |
| Ultra-low distortion | −85 dBc HD3 at 20 MHz and 0.02%/0.01° DG/DP ensure broadcast-compliant video signal integrity with minimal color error |
| High-speed enable/disable | 7.3 ns channel enable and 4.5 ns disable support time-multiplexed sampling, gated IF paths, and burst-mode operation |
| Optimized for capacitive loads | Series output resistor recommendations (e.g., 24 Ω for 47 pF) prevent peaking/ringing - validated up to 120 pF |
Applications
| RGB Video Driver | Flash ADC Driver |
|---|---|
|
Use Scenario: Driving 75 Ω coaxial cables in HDTV or high-resolution VGA systems with back-terminated loads. IC Role / Device Role / Timing Role: Triple-channel buffer with 2× gain per channel to compensate for 6 dB cable loss while preserving timing alignment across R/G/B paths. Use Value: 0.02%/0.01° differential gain/phase ensures no visible color shift or hue error in production video signals. |
Use Scenario: Buffering analog inputs to 12-bit, 100+ MSPS flash ADCs in communications test equipment. IC Role / Device Role / Timing Role: High-fidelity signal conditioner providing 750 MHz bandwidth and −85 dBc HD3 to preserve ENOB at 20 MHz input. Use Value: 2.3 nV/√Hz input noise and 3300 V/µs slew rate prevent aperture jitter and amplitude-dependent quantization error. |
| Wide-Dynamic-Range IF Amplifier | Radar Receiver Baseband Summer |
|
Use Scenario: Amplifying 10–100 MHz IF signals in SDR receivers requiring >80 dB SFDR over 30 MHz bandwidth. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block placed after mixer output to boost signal before digitization. Use Value: −90 dBc HD3 at 5 MHz and 400 MHz −3 dB bandwidth at AV = +2 support high-SFDR baseband conversion. |
Use Scenario: Summing in-phase (I) and quadrature (Q) baseband signals in pulsed radar receivers with precise amplitude/phase matching. IC Role / Device Role / Timing Role: Wideband inverting summer using matched LMH6738MQ channels to combine I/Q paths with <0.1° phase skew. Use Value: Channel-to-channel crosstalk of −80 dB at 10 MHz prevents I/Q leakage and preserves pulse compression fidelity. |
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), slew rate (3300 V/µs), and noise (2.3 nV/√Hz), but no multi-channel integration or disable pins | Requires three separate packages and PCB area for RGB or I/Q; lacks per-channel power gating | Select when only one high-speed channel is needed or board space allows discrete placement |
| THS3201DGN | Single-channel, 1.8 GHz bandwidth, higher supply current (40 mA), no disable function, different pinout (8-pin MSOP) | Higher bandwidth suits >100 MHz IF stages but cannot replace triple-channel functionality without redesign | Choose for maximum small-signal bandwidth where channel count and disable control are secondary |
Compared with LMH6738MQ, LMH6732MA/NOPB offers identical per-channel performance but requires three devices to match triple functionality and lacks integrated disable control; THS3201DGN provides higher bandwidth but forces system-level redesign due to single-channel topology and incompatible packaging.
Availability
LMH6738MQ is available at Aetrix Electronics and suitable for RGB video driver, flash ADC interface, and wide-dynamic-range IF amplifier applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and broadcast OEM programs.
Supply support for LMH6738MQ 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 amplifier design and manufacturing.
The LMH6738MQ belongs to TI's LMH high-speed amplifier product line, engineered specifically for ultra-high-resolution video systems and wide-dynamic-range signal chains demanding exceptional bandwidth, low distortion, and DC coupling.
FAQ
What is the operating supply voltage range for the LMH6738MQ?
The LMH6738MQ operates over a supply voltage range of ±4 V to ±6 V (8 V to 12 V total), with specified performance at ±5 V. Absolute maximum supply voltage is ±6.6 V. Operation outside the ±4 V to ±6 V range may degrade bandwidth, distortion, or output swing - for example, at ±4 V supply, the 2 VPP −3 dB bandwidth drops to ~400 MHz, and linear output current decreases to ~70 mA.
Does the LMH6738MQ support unity-gain stable operation?
Yes, the LMH6738MQ is unity-gain stable without external compensation due to its current-feedback architecture. It achieves 750 MHz −3 dB bandwidth at AV = +1 with a 749 Ω feedback resistor. Stability is maintained across the full gain range of ±1 to ±10 using recommended RF values from TI's Figure 24 - for instance, 549 Ω at AV = +2 and 459 Ω at AV = +5.
How does the LMH6738MQ handle capacitive loads on its outputs?
The LMH6738MQ requires a series output resistor (ROUT) to stabilize operation with capacitive loads ≥5 pF. Recommended ROUT values range from 17 Ω (100 pF) to 70 Ω (1 pF), per TI's Figure 26. Without ROUT, loads between 5–120 pF cause peaking, ringing, or oscillation. Placing ROUT inside the feedback loop (Figure 27) preserves gain accuracy but limits output swing.
What is the thermal performance limitation of the LMH6738MQ in SSOP-16 package?
With θJA = 120°C/W, the LMH6738MQ reaches ~140°C junction temperature at 85°C ambient when all three channels operate at ±5 V with 2 VPP output into 75 Ω. Exceeding 150°C risks permanent damage. Forced air cooling, copper pour under the package, or thermal vias to inner ground planes are required for sustained full-load operation above 60°C ambient.
Can the LMH6738MQ be used in single-supply configurations?
Yes - the LMH6738MQ has no internal ground reference and supports single-supply operation. For example, with VCC = +10 V and GND = 0 V, the input common-mode range extends from 0 V to +10 V, and output swings from ~1.5 V to ~8.5 V into 100 Ω. Input bias currents (±7 µA typical) and offset voltage (±2.5 mV) remain within spec, but PSRR degrades slightly versus split-supply use.
LMH6738MQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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
LMH6738MQ FAQ
1.How can I place an order for LMH6738MQ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6738MQ 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 LMH6738MQ reliable?
The price and inventory of LMH6738MQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6738MQ is usually 5 days.
3.What payment methods are accepted for LMH6738MQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6738MQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6738MQ?
LMH6738MQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6738MQ 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 LMH6738MQ?
For technical support, including LMH6738MQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6738MQ requirements.
6.How does Aetrix verify that LMH6738MQ is sourced from the original manufacturer or authorized distributors?
All LMH6738MQ 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 LMH6738MQ meets industry standards.
7.What is the process for return or replacement of LMH6738MQ?
All LMH6738MQ units undergo pre-shipment inspection (PSI). If there is an issue with LMH6738MQ, 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 LMH6738MQ part is unused and in its original packaging.
Return procedure for LMH6738MQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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