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Texas Instruments LMH6739MQX
- Part No.:
- LMH6739MQX
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LMH6739MQX.pdf
- Description:
- IC AMP BUFFER 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,823
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Product details
Overview
LMH6739MQX from Texas Instruments is a very wideband, low-distortion triple current-feedback selectable gain buffer (SGB) with 750 MHz −3 dB small-signal bandwidth (AV = +1), −85 dBc 3rd harmonic distortion at 20 MHz, and 3300 V/µs slew rate. It delivers three independent high-fidelity amplifiers in a single SSOP-16 package, supporting gains of −1, +1, and +2 for RGB video driver, flash A/D converter driving, and wideband IF amplifier applications.
For engineers reviewing the LMH6739MQX datasheet, LMH6739MQX pinout, LMH6739MQX application, or LMH6739MQX equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready availability details - all specific to the LMH6739MQX/NOPB.A orderable variant in SSOP-16 (DBQ) packaging.
Technical Context
The LMH6739MQX implements a current-feedback architecture with on-chip 450 Ω internal feedback and gain-setting resistors, enabling stable operation across AV = −1, +1, and +2 configurations without external resistors. Its input stage features matched high-impedance non-inverting (+IN) and low-impedance inverting (−IN) terminals per channel, with independent disable control (DIS A/B/C) for power-gated operation.
Each amplifier supports ±5 V dual-supply operation (8–12 V total), delivers 90 mA linear output current into 100 Ω, and maintains 0.02%/0.01% differential gain/phase at 4.43 MHz with 150 Ω load - confirming its suitability for broadcast-grade analog video signal conditioning and high-speed data acquisition front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 750 MHz at AV = +1: enables full-spectrum baseband video and wideband IF signal amplification without roll-off in 1080p/4K timing paths. |
| 3rd Harmonic Distortion | −85 dBc at 20 MHz: ensures <12-bit SFDR in ADC driver applications up to 30 MHz with 100 Ω load. |
| Input Noise Voltage | 2.3 nV/√Hz >1 MHz: preserves SNR integrity when buffering low-level signals from precision DACs or RF mixers. |
| Slew Rate | 3300 V/µs: supports clean 2 VPP step response with ≤1.7 ns rise/fall time, critical for pulse fidelity in radar receiver chains. |
| Supply Current | 32 mA total (10.6 mA per op amp): balances ultra-high speed with manageable thermal load in space-constrained SSOP-16 layouts. |
| Differential Gain/Phase | 0.02%/0.01° at 4.43 MHz, RL = 150 Ω: meets NTSC/PAL broadcast video linearity requirements without post-correction. |
| Linear Output Current | 90 mA: drives back-terminated 75 Ω coaxial cables or 100 Ω differential loads directly, eliminating external buffers in RGB/HDMI analog stages. |
Pinout & Package
LMH6739MQX is housed in a 16-pin Shrink Small-Outline Package (SSOP), package code DBQ0016A, with 0.635 mm lead pitch and 1.75 mm max height. The package includes dedicated power/ground pins per amplifier section to minimize crosstalk and improve PSRR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN A) | Inverting input, Channel A | Low-impedance node (30 Ω) for current-feedback configuration; connects to ground for AV = +2 mode. |
| 2 (+IN A) | Non-inverting input, Channel A | High-impedance node (1000 kΩ) for unity-gain follower or summing junction; requires minimal trace capacitance. |
| 3 (−IN B) | Inverting input, Channel B | Independent inverting input for Channel B; used with Pin 4 to select gain per Table 1 in datasheet. |
| 4 (+IN B) | Non-inverting input, Channel B | Configurable input for Channel B; floating for AV = −1, grounded for AV = +2 per TI application note. |
| 5 (DIS B) | Disable control, Channel B | Active-high logic input; ≥2.0 V enables, ≤0.8 V disables Channel B with 4.5 ns disable time. |
| 6 (DIS C) | Disable control, Channel C | Independent shutdown pin for Channel C; reduces quiescent current to 2.2 mA (V+) and 1.3 mA (V−) when asserted. |
| 7 (−IN C) | Inverting input, Channel C | Third amplifier inverting input; matches electrical characteristics of Pins 1 and 3 for consistent multi-channel design. |
| 8 (+IN C) | Non-inverting input, Channel C | Third amplifier non-inverting input; supports identical gain configurations as Channels A and B. |
| 9 (−VS) | Negative supply rail | Common negative supply pin for all three amplifiers; must be decoupled with 0.01 µF + 6.8 µF near pin. |
| 10 (OUT C) | Output, Channel C | Low-output-impedance (0.05 Ω DC) driver capable of 90 mA linear current; requires series resistor for >5 pF capacitive loads. |
| 11 (+VS) | Positive supply rail | Common positive supply pin; shares thermal path with Pins 9 and 16 for balanced power delivery in SSOP layout. |
| 12 (OUT B) | Output, Channel B | Matched output stage to OUT A/C; supports identical video/IF load conditions and settling time (10 ns to 0.1%). |
| 13 (−VS) | Negative supply rail (duplicate) | Second −VS connection for improved supply bypassing and reduced ground bounce in high-speed multi-channel operation. |
| 14 (OUT A) | Output, Channel A | Primary output for RGB red channel or first IF path; exhibits same 400 MHz 2 VPP 3 dB bandwidth as other channels. |
| 15 (+VS) | Positive supply rail (duplicate) | Second +VS connection; enables star-point decoupling topology to minimize supply coupling between channels. |
| 16 (DIS A) | Disable control, Channel A | Enables per-channel power gating; allows dynamic power scaling in multi-stage video processing pipelines. |
Key Features
| Feature | Design Value |
|---|---|
| Triple selectable-gain buffer | Three independent current-feedback amplifiers with factory-trimmed 450 Ω internal RF/RG resistors enable AV = −1, +1, +2 without external components. |
| Ultra-low distortion at 20 MHz | −85 dBc 3rd harmonic distortion ensures <0.0017% THD+N in 10-bit+ video digitization and high-fidelity IF sampling. |
| Per-channel shutdown | Individual DIS A/B/C pins reduce total supply current to ≤2.2 mA per enabled rail, enabling dynamic power management in portable test equipment. |
| DC-coupled video performance | 0.02%/0.01% differential gain/phase at 4.43 MHz meets SMPTE 253M and ITU-R BT.601 broadcast standards without AC coupling. |
| High output drive into 100 Ω | 90 mA linear output current supports direct driving of 75 Ω coax or 100 Ω PCB traces, eliminating need for external line drivers in RGB systems. |
Applications
| RGB Video Driver | Flash A/D Converter Driver |
|---|---|
Use Scenario: Driving three synchronized analog RGB signals from a graphics processor to a CRT or analog projector input. IC Role / Device Role / Timing Role: Triple buffer providing matched gain, phase, and delay across R/G/B channels with DC coupling and back-termination support. Use Value: Eliminates inter-channel skew and differential phase errors that cause color fringing; maintains 0.01° phase matching across 4.43 MHz NTSC carrier. |
Use Scenario: Conditioning analog input signals before high-speed flash ADCs in digital oscilloscopes or spectrum analyzers. IC Role / Device Role / Timing Role: Wideband, low-noise buffer isolating source impedance and delivering full-scale 2 VPP swing with <10 ns settling to 0.1%. Use Value: Preserves ENOB >9.5 bits at 20 MSPS by limiting harmonic distortion to −85 dBc and input noise to 2.3 nV/√Hz. |
| Wide Dynamic Range IF Amplifier | Radar Receiver Baseband Chain |
Use Scenario: Amplifying intermediate frequency outputs from quadrature demodulators in SDR receivers operating from 10–100 MHz. IC Role / Device Role / Timing Role: Low-noise, high-linearity IF gain block with 750 MHz bandwidth and 480 MHz small-signal −3 dB point at AV = +2. Use Value: Enables >100 dB spurious-free dynamic range (SFDR) by suppressing 2nd/3rd harmonics below −71/−85 dBc at 20 MHz. |
Use Scenario: Buffering baseband I/Q signals from radar mixer outputs prior to digitization in pulsed-Doppler systems. IC Role / Device Role / Timing Role: Triple-channel pulse-preserving buffer with 0.9 ns rise time and 3300 V/µs slew rate for sub-ns edge fidelity. Use Value: Maintains pulse integrity for 100 ps rise-time radar returns, preventing timing jitter and range resolution degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple wideband buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6738MQX | Single-channel version with identical bandwidth (750 MHz), distortion (−85 dBc), and noise (2.3 nV/√Hz); lacks DIS pin and second/third channels. | Used where only one high-speed buffer is needed; not suitable for RGB or I/Q parallel paths requiring three matched amps. | Select LMH6738MQX only when system architecture uses discrete single-channel buffering instead of integrated triple-channel consolidation. |
| THS3201CD | Single-channel current-feedback amplifier with 1.8 GHz bandwidth but higher distortion (−72 dBc HD3 @ 20 MHz) and no integrated gain selection or shutdown. | Preferred for ultra-wideband (>1 GHz) applications where distortion tolerance exceeds −72 dBc; requires external gain resistors and disable circuitry. | Choose THS3201CD only when bandwidth >1 GHz is mandatory and system-level distortion budget allows −72 dBc at 20 MHz. |
Compared with LMH6738MQX and THS3201CD, the LMH6739MQX uniquely integrates three matched, independently controllable wideband buffers with factory-set gain options and per-channel shutdown - reducing board area, component count, and inter-channel mismatch in RGB, I/Q, and multi-path IF systems.
Availability
LMH6739MQX is available at Aetrix Electronics and suitable for RGB video driver, flash A/D converter driver, and wide dynamic range IF amplifier applications requiring stable component supply, long-term production continuity, and RoHS-compliant SSOP-16 packaging.
Supply support for LMH6739MQX 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 video signal conditioning.
The LMH6739MQX 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 fidelity, low distortion, and DC-coupled operation.
FAQ
What gain configurations does the LMH6739MQX support, and how are they selected?
The LMH6739MQX supports AV = −1, +1, and +2 using internal 450 Ω feedback resistors. Gain is set by connecting each channel's −IN and +IN pins per Table 1: for AV = −1, −IN receives signal and +IN is grounded; for AV = +1, +IN receives signal and −IN is open; for AV = +2, +IN receives signal and −IN is grounded. No external resistors are required, and gain accuracy is ±1.1% over temperature.
Does the LMH6739MQX require external compensation for stability, and what is the recommended approach for capacitive loads?
Yes - the LMH6739MQX exhibits unity-gain peaking due to its current-feedback architecture. For capacitive loads >5 pF, TI recommends adding a series output resistor (ROUT); values range from 17 Ω (100 pF) to 70 Ω (4.7 pF) per Figure 28. Alternatively, an RC filter on the non-inverting input (e.g., 1.7 pF capacitor) suppresses peaking while preserving bandwidth, as shown in Figure 24.
What is the maximum junction temperature of the LMH6739MQX, and how is thermal management addressed in the SSOP-16 package?
The LMH6739MQX has a maximum junction temperature of +150°C. With θJA = 120°C/W in still air, power dissipation must be limited: at ±5 V and all channels enabled, quiescent dissipation is ~340 mW, raising junction temperature ~40°C above ambient. Forced air cooling, copper pour under the package, and thermal vias to inner layers are recommended to maintain TJ < 140°C at 85°C ambient.
How does the LMH6739MQX perform in video applications, and what load conditions optimize differential gain/phase?
The LMH6739MQX achieves 0.02%/0.01% differential gain/phase at 4.43 MHz into 150 Ω - meeting broadcast video standards. Optimal performance requires back-terminated 75 Ω coaxial loads (e.g., 75 Ω series resistor at driver end), which mask parasitic capacitances and reduce reflections. TI Figure 29 shows typical RGB driving configuration with AV = +2 to compensate for 6 dB loss in the series resistor.
Is the LMH6739MQX pin-compatible with other TI triple amplifiers such as the LMH6723 or LMH6732?
No - the LMH6739MQX is not pin-compatible with LMH6723 or LMH6732. LMH6723 uses a different pinout (e.g., shared disable, no per-channel DIS pins) and lacks internal gain resistors. LMH6732 is a voltage-feedback triple op-amp with lower bandwidth (200 MHz) and no selectable gain. The LMH6739MQX's SSOP-16 pin mapping is unique to its current-feedback architecture and per-channel disable functionality.
LMH6739MQX 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:
- Buffer
- 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
LMH6739MQX FAQ
1.How can I place an order for LMH6739MQX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6739MQX 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 LMH6739MQX reliable?
The price and inventory of LMH6739MQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6739MQX is usually 5 days.
3.What payment methods are accepted for LMH6739MQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6739MQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6739MQX?
LMH6739MQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6739MQX 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 LMH6739MQX?
For technical support, including LMH6739MQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6739MQX requirements.
6.How does Aetrix verify that LMH6739MQX is sourced from the original manufacturer or authorized distributors?
All LMH6739MQX 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 LMH6739MQX meets industry standards.
7.What is the process for return or replacement of LMH6739MQX?
All LMH6739MQX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6739MQX, 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 LMH6739MQX part is unused and in its original packaging.
Return procedure for LMH6739MQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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