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Texas Instruments LMH6738MQX/NOPB
- Part No.:
- LMH6738MQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LMH6738MQX/NOPB.pdf
- Description:
- IC AMP CURRENT FEEDBACK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,547
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Product details
Overview
LMH6738MQX/NOPB 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 serves as a high-fidelity RGB video driver, flash ADC/DAC buffer, or wide-dynamic-range IF amplifier in ultra-high-resolution video and radar systems.
For engineers reviewing the LMH6738MQX/NOPB datasheet, LMH6738MQX/NOPB pinout, LMH6738MQX/NOPB application, or LMH6738MQX/NOPB equivalent, key selection considerations include its current-feedback architecture enabling stable unity-gain operation, differential gain/phase of 0.02%/0.01° into 150 Ω, and per-channel supply current of 11.3 mA at ±5 V.
Technical Context
The LMH6738MQX/NOPB implements a current-feedback topology with separate high-impedance non-inverting input and low-impedance inverting input (≈30 Ω), enabling gain-bandwidth independence via feedback resistor (RF) tuning. Its three independent amplifiers share no internal ground reference, supporting flexible single- or split-supply configurations (±4 V to ±6 V).
Each channel features individual enable/disable control (DIS A/B/C), 90 mA linear output current, 2.3 nV/√Hz input voltage noise, and DC-coupled operation. The device achieves 400 MHz −3 dB bandwidth at AV = +2 (2 VPP), 0.1 dB flatness to 150 MHz, and maintains stability without external compensation across gains of ±1 to ±10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 750 MHz at AV = +1 - enables baseband signal amplification up to UHF without attenuation |
| Slew Rate | 3300 V/µs - supports clean 2 VPP step response with 0.9 ns rise time (10%–90%) |
| 3rd Harmonic Distortion | −85 dBc at 20 MHz, 2 VPP - preserves spectral purity in wideband IF and video applications |
| Differential Gain/Phase | 0.02%/0.01° into 150 Ω - meets broadcast-grade NTSC/PAL and HDTV timing fidelity requirements |
| Input Voltage Noise | 2.3 nV/√Hz above 1 MHz - minimizes added noise in low-level signal conditioning paths |
| Supply Current (per amp) | 11.3 mA at ±5 V - balances high-speed performance with thermal manageability in triple-channel layout |
| Linear Output Current | 90 mA - drives 75 Ω back-terminated video lines or 100 Ω ADC inputs without clipping |
Pinout & Package
LMH6738MQX/NOPB 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 1 is located at top-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN A) | Inverting input, Channel A | Low-impedance node (≈30 Ω); connects to feedback network for gain-setting |
| 2 (+IN A) | Non-inverting input, Channel A | High-impedance node (>1 MΩ); used for buffer or non-inverting configurations |
| 3 (−IN B) | Inverting input, Channel B | Independent low-Z input for Channel B; isolated from other channels |
| 4 (+IN B) | Non-inverting input, Channel B | Independent high-Z input; supports DC-coupled signal routing |
| 5 (DIS B) | Channel B disable control | Active-high logic; ≥2.0 V enables, ≤0.8 V disables amplifier output and reduces quiescent current to 1.3 mA |
| 6 (DIS C) | Channel C disable control | Active-high logic; enables power-gating per channel in multi-stage systems |
| 7 (−IN C) | Inverting input, Channel C | Third independent low-Z input; supports triple-channel summing or parallel processing |
| 8 (+IN C) | Non-inverting input, Channel C | Third high-Z input; allows independent biasing or signal injection |
| 9 (−VS) | Negative supply rail | Accepts −4 V to −6 V; shares common return with all three amplifiers |
| 10 (OUT C) | Output, Channel C | Capable of ±3.5 V swing into 100 Ω; requires series resistor (e.g., 51 Ω) for capacitive load stabilization |
| 11 (+VS) | Positive supply rail | Accepts +4 V to +6 V; decoupling required at each pin with 0.01 µF + 6.8 µF pair |
| 12 (OUT B) | Output, Channel B | Matched drive capability to OUT A/C; supports simultaneous RGB or I/Q path buffering |
| 13 (−VS) | Negative supply rail (second pin) | Redundant −VS connection improves PSRR and reduces supply impedance |
| 14 (OUT A) | Output, Channel A | Primary output for critical signal path; same electrical specs as OUT B/C |
| 15 (+VS) | Positive supply rail (second pin) | Redundant +VS connection enhances high-frequency supply rejection |
| 16 (DIS A) | Channel A disable control | Enables dynamic channel shutdown in power-sensitive applications like portable test equipment |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables stable unity-gain operation without external compensation, unlike voltage-feedback op amps |
| Per-channel disable pins (DIS A/B/C) | Reduces total supply current from 35 mA to ~4.5 mA when two channels are disabled, lowering thermal load |
| DC-coupled signal path | Supports precise level-shifting and baseband amplification without AC-coupling capacitors or drift errors |
| 75 Ω back-termination compatibility | Delivers 0.02%/0.01° differential gain/phase into 150 Ω loads-critical for broadcast video integrity |
| 30 Ω inverting input impedance | Allows predictable RF selection for gain setting (e.g., 549 Ω for AV = +2), minimizing layout sensitivity |
Applications
| RGB Video Driver | Flash ADC Driver |
|---|---|
|
Use Scenario: Driving analog RGB signals from graphics processor to 75 Ω coaxial cable in high-resolution projectors or medical imaging displays. IC Role / Device Role / Timing Role: Triple-channel buffer with matched propagation delay and gain, preserving color channel synchronization and edge fidelity. Use Value: 0.02%/0.01° differential gain/phase ensures accurate hue/saturation reproduction; 400 MHz −3 dB bandwidth supports 1080p60 and WUXGA timing. |
Use Scenario: Conditioning full-scale analog input before sampling by 12-bit, 100 MSPS flash ADC in communications test equipment. IC Role / Device Role / Timing Role: Wideband, low-noise gain stage that maintains SNR and prevents aperture jitter-induced distortion. Use Value: 2.3 nV/√Hz input noise and −85 dBc HD3 at 20 MHz preserve effective number of bits (ENOB) across 30 MHz input bandwidth. |
| Radar IF Amplifier | Wideband Inverting Summer |
|
Use Scenario: Amplifying 100–500 MHz intermediate frequency outputs from mixer stages in pulsed-Doppler radar receivers. IC Role / Device Role / Timing Role: Low-distortion, high-SFDR gain block that avoids intermodulation products masking weak target returns. Use Value: −85 dBc 3rd harmonic distortion at 20 MHz scales to >−70 dBc at 100 MHz, enabling >70 dB spurious-free dynamic range (SFDR). |
Use Scenario: Summing three high-speed sensor outputs (e.g., accelerometers, gyroscopes) with inverted polarity in inertial navigation systems. IC Role / Device Role / Timing Role: Precision inverting summer using matched feedback resistors across all three channels for common-mode rejection. Use Value: 3300 V/µs slew rate handles fast transients without slewing-induced phase error; crosstalk <−80 dBc prevents channel coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6732MF/NOPB | Single-channel version; identical bandwidth (750 MHz), noise (2.3 nV/√Hz), and distortion specs; lacks DIS pin and second/third channels | Requires three separate packages for triple-channel use; increases board area and inter-channel skew | Select when only one high-speed path is needed or when channel isolation must exceed on-die coupling limits |
| THS3201DGN | Single-channel, 1.8 GHz bandwidth, higher supply current (18 mA), no disable function; uses SOIC-8 package | Higher bandwidth but no multi-channel integration; incompatible pinout and feedback resistor optimization | Choose for >1 GHz small-signal applications where LMH6738MQX/NOPB's 750 MHz is insufficient, accepting higher power and discrete layout |
Compared with LMH6738MQX/NOPB, LMH6732MF/NOPB offers identical per-channel performance but requires replication for multi-channel use, while THS3201DGN trades integration and power efficiency for raw bandwidth-making LMH6738MQX/NOPB optimal for space-constrained, power-aware triple-path designs.
Availability
LMH6738MQX/NOPB is available at Aetrix Electronics and suitable for RGB video driver, flash ADC front-end, and wide-dynamic-range IF amplifier applications requiring stable component supply across industrial, broadcast, and defense electronics programs.
Supply support for LMH6738MQX/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 and embedded processing technologies, with decades of innovation in high-speed amplifiers and precision signal chain solutions.
The LMH6738MQX/NOPB belongs to TI's LMH high-speed amplifier product line, engineered specifically for ultra-high-resolution video, radar, and wideband communications systems demanding exceptional bandwidth, low distortion, and multi-channel integration.
FAQ
What is the recommended feedback resistor value for LMH6738MQX/NOPB at AV = +2?
The LMH6738MQX/NOPB datasheet specifies a 549 Ω feedback resistor (RF) for AV = +2 with ±5 V supplies and 100 Ω load. This value balances bandwidth extension and stability-lower RF increases peaking and bandwidth, while higher RF rolls off response. For production designs, RF = 549 Ω yields ~0.1 dB peaking and 480 MHz −3 dB bandwidth, matching characterization conditions in the Electrical Characteristics table.
Does LMH6738MQX/NOPB support single-supply operation?
Yes, LMH6738MQX/NOPB supports single-supply operation because it has no internal ground reference. With proper input common-mode and output swing constraints (e.g., VCM = VCC/2, RL referenced to mid-rail), it operates from +8 V to +12 V single supply. However, split-supply (±5 V) is preferred for symmetric video and IF applications to maximize dynamic range and minimize DC offset impact.
How does the disable function affect power consumption in LMH6738MQX/NOPB?
When a channel's DIS pin is driven low (≤0.8 V), that amplifier shuts down, reducing its supply current from 11.3 mA to 1.3 mA (DIS high) or 1.1 mA (DIS low) depending on rail. With all three channels enabled, total ICC = 35 mA typical; with two channels disabled, ICC drops to ~13.9 mA-cutting power dissipation by >60% and easing thermal design in portable or dense PCB layouts.
Can LMH6738MQX/NOPB drive a 75 Ω coaxial cable directly?
LMH6738MQX/NOPB can drive a 75 Ω coaxial cable but requires back-termination: place a 75 Ω resistor from output to ground at the far end (load side), not at the amplifier output. This configuration minimizes reflections and achieves the specified 0.02%/0.01° differential gain/phase. Driving unterminated 75 Ω loads causes ringing and degrades video fidelity due to mismatched impedance.
What is the maximum safe junction temperature for LMH6738MQX/NOPB?
The absolute maximum junction temperature for LMH6738MQX/NOPB is +150°C. At 85°C ambient and ±5 V supply with all channels active, junction temperature reaches ~140°C in standard SSOP-16 layout-within limit but with only 10°C margin. To ensure reliability, use forced air cooling, thermal vias under the package, or copper pour on PCB layers to reduce θJA below the rated 120°C/W.
LMH6738MQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LMH6738MQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6738MQX/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 LMH6738MQX/NOPB reliable?
The price and inventory of LMH6738MQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6738MQX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6738MQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6738MQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6738MQX/NOPB?
LMH6738MQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6738MQX/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 LMH6738MQX/NOPB?
For technical support, including LMH6738MQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6738MQX/NOPB requirements.
6.How does Aetrix verify that LMH6738MQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6738MQX/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 LMH6738MQX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6738MQX/NOPB?
All LMH6738MQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6738MQX/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 LMH6738MQX/NOPB part is unused and in its original packaging.
Return procedure for LMH6738MQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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