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Texas Instruments LMH6609MFX
- Part No.:
- LMH6609MFX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMH6609MFX.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
LMH6609MFX from Texas Instruments is a unity-gain-stable, voltage-feedback operational amplifier optimized for high-speed video, IF/RF, and active filter applications. It delivers 900 MHz −3 dB bandwidth at AV = 1 (±5 V), 1400 V/µs slew rate, 90 mA linear output current, and 0.01%/0.026° differential gain/phase performance for PAL video systems.
For engineers reviewing the LMH6609MFX datasheet, LMH6609MFX pinout, LMH6609MFX application, or LMH6609MFX equivalent, key selection criteria include large-signal bandwidth under ±3.3 V/±5 V supplies, capacitive load drive capability with external ROUT, transimpedance amplifier suitability, and SOT-23-5 package constraints for space-constrained layouts.
Technical Context
The LMH6609MFX employs voltage-feedback architecture with symmetrical, balanced inputs and matched bias currents-enabling precise DC offset cancellation via input impedance balancing. Its unity-gain stability eliminates need for external compensation in buffer or gain-of-1 configurations.
It supports both inverting and non-inverting topologies with standard resistor-based gain setting (e.g., AV = 1 + RF/RG or AV = −RF/RG), and features low 3.1 nV/√Hz input voltage noise and 1.6 pA/√Hz current noise-critical for transimpedance and low-distortion signal chain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth (AV = 1) | 900 MHz at ±5 V supply - enables direct baseband video or IF signal amplification without intermediate gain staging |
| Slew Rate | 1400 V/µs - supports clean 4 VPP step response with ≤2.6 ns fall time, essential for fast-pulse and DAC output buffering |
| Linear Output Current | ±90 mA - drives multiple 75 Ω video loads or coaxial cables without gain compression or distortion |
| Differential Gain / Phase | 0.01% / 0.026° at 4.43 MHz - meets PAL broadcast video fidelity requirements with back-terminated 150 Ω loads |
| Supply Voltage Range | ±3.3 V to ±6 V - compatible with dual-rail portable and industrial systems; 7 mA quiescent current at ±5 V minimizes thermal load |
| Input Voltage Noise | 3.1 nV/√Hz >1 MHz - preserves SNR in wideband receiver front-ends and precision transimpedance stages |
| Operating Temperature | −40°C to +85°C - qualified for industrial and embedded video equipment environments |
Pinout & Package
The LMH6609MFX is housed in a 5-pin SOT-23 package (DBV0005A), with exposed pad not electrically connected. Thermal resistance θJA = 187°C/W enables operation up to 85°C ambient with moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Positive supply rail | Accepts +3.3 V to +6 V; requires 0.1 µF ceramic + 10 µF tantalum bypassing to ground for HF stability |
| 2 - IN− | Inverting input | High-impedance node; connects to feedback network (e.g., RF) and source termination for optimal AC performance |
| 3 - OUT | Amplifier output | Capable of ±90 mA drive; series ROUT (e.g., 51 Ω) recommended when driving >10 pF capacitive loads |
| 4 - IN+ | Non-inverting input | Matched to IN− for bias current cancellation; impedance should mirror IN− path (e.g., RG || RS) to minimize VOS drift |
| 5 - V− | Negative supply rail | Accepts −3.3 V to −6 V; must be decoupled identically to V+ to maintain PSRR >73 dB |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback architecture | Enables predictable closed-loop bandwidth (≈ GBP/AV) and stable active filter/integrator design without current-feedback trade-offs |
| Unity-gain stability | Operates robustly as buffer (AV = 1) without external compensation-reducing BOM count and layout sensitivity |
| Low input offset voltage | ±0.8 mV max ensures <1 LSB error in 12-bit DAC output buffering with minimal calibration overhead |
| High PSRR/CMRR | 73 dB PSRR and 73 dB CMRR at DC allow reliable operation in noisy mixed-signal PCBs with shared analog/digital rails |
| Video-optimized linearity | Differential gain/phase specs validated per PAL standard enable drop-in replacement in legacy broadcast and test equipment signal paths |
Applications
| Video Line Driver | IF Amplifier |
|---|---|
Use Scenario: Driving single-ended 75 Ω composite video signals over 100 m coaxial cable in broadcast monitoring equipment. IC Role / Device Role / Timing Role: Buffer amplifier configured for AV = 2 to compensate for 6 dB loss across back-termination resistor. Use Value: 0.01% differential gain preserves color fidelity; 90 mA output current sustains signal integrity without external boost stages. | Use Scenario: Amplifying 40–200 MHz IF signals in software-defined radio receivers prior to ADC sampling. IC Role / Device Role / Timing Role: Fixed-gain (AV = +2) voltage amplifier with 280 MHz −3 dB bandwidth at 2 VPP output. Use Value: 1400 V/µs slew rate prevents pulse distortion; 3.1 nV/√Hz noise floor maintains SNR >70 dB across 100 MHz instantaneous bandwidth. |
| Transimpedance Amplifier | DAC Output Buffer |
Use Scenario: Converting photodiode current (e.g., 10 µA–1 mA) to voltage in optical sensing modules. IC Role / Device Role / Timing Role: Low-noise transimpedance stage with RF = 10 kΩ and CF ≈ ½ CD for stability. Use Value: 1.6 pA/√Hz input current noise minimizes Johnson noise contribution; unity-gain stability avoids oscillation with diode capacitance. | Use Scenario: Buffering 10–14 bit DAC outputs in automated test equipment requiring fast settling and low glitch energy. IC Role / Device Role / Timing Role: Unity-gain follower with 15 ns settling to 0.05% for 2 V step, driven from low-Z DAC core. Use Value: 900 MHz bandwidth ensures flat frequency response to >100 MHz; ±90 mA drive handles 50 Ω terminated loads directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6601MF/NOPB | Lower 130 MHz bandwidth, 1100 V/µs slew rate, 45 mA output current; SOT-23-5 package | Targeted at lower-power portable video and sensor interfaces where full LMH6609MFX bandwidth is unnecessary | Select when power budget <5 mA and large-signal BW <200 MHz suffices; not suitable for 900 MHz small-signal or 4 VPP pulse applications |
| THS3201DGN | Current-feedback architecture; 1.8 GHz bandwidth, 4300 V/µs slew rate; 8-pin MSOP package; higher 15 mA supply current | Optimized for ultra-wideband fixed-gain amplification (e.g., ADC driver), not unity-gain or active filter use | Choose only for fixed AV ≥ 5 and >1 GHz bandwidth needs; requires careful layout due to CFB sensitivity to feedback resistor tolerance and parasitics |
Compared with LMH6609MFX, LMH6601MF offers reduced speed and drive for battery-powered designs, while THS3201DGN provides higher bandwidth at the cost of unity-gain instability and increased supply current-making LMH6609MFX the optimal balance of speed, stability, and efficiency in SOT-23-5 form factor.
Availability
LMH6609MFX is available at Aetrix Electronics and suitable for video line drivers, IF amplifiers, transimpedance stages, and DAC output buffers requiring stable component supply across industrial temperature range and long production lifecycles.
Supply support for LMH6609MFX 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 heritage in high-performance op amps and signal chain solutions.
The LMH6609MFX belongs to TI's LMH high-speed amplifier product line, engineered specifically for demanding video, communications, and instrumentation applications where bandwidth, linearity, and output drive must coexist in compact packages.
FAQ
What is the maximum small-signal bandwidth of LMH6609MFX at unity gain?
The LMH6609MFX achieves 900 MHz −3 dB bandwidth at AV = 1 with ±5 V supply and 0.25 VPP output. At ±3.3 V supply, bandwidth reduces to 450 MHz under identical conditions. This specification is measured with matched 100 Ω loads and verified per TI's SNOSA84F datasheet Figure 6 and Electrical Characteristics table.
Does LMH6609MFX require external compensation for unity-gain operation?
No, LMH6609MFX is explicitly unity-gain stable per its datasheet and does not require external compensation capacitors. Its voltage-feedback architecture and internal compensation ensure phase margin >60° at AV = 1, enabling direct use as a buffer without risk of oscillation-validated across −40°C to +85°C.
Can LMH6609MFX drive a 75 Ω video load with proper differential gain performance?
Yes, LMH6609MFX is specified for 0.01% differential gain and 0.026° differential phase into 150 Ω (back-terminated 75 Ω) loads at 4.43 MHz, meeting PAL video standards. For optimal results, configure for AV = 2 and terminate the output with 75 Ω to match transmission line impedance and suppress reflections.
What is the recommended output series resistor (ROUT) when driving a 50 pF capacitive load with LMH6609MFX?
Per TI's Typical Performance Characteristics (Figure 13), the recommended ROUT for 50 pF capacitive load is 32 Ω when using ±5 V supply. This value limits peaking to ≤0.5 dB and balances settling time versus bandwidth-verified on evaluation board LMH730216 and applicable to LMH6609MFX in SOT-23-5 package.
Is LMH6609MFX suitable for transimpedance amplifier applications with photodiodes?
Yes, LMH6609MFX is well-suited for transimpedance amplifiers due to its 1.6 pA/√Hz input current noise, unity-gain stability, and low input capacitance (1.2 pF). TI application note SNOSA84F Figure 38 demonstrates a validated photodiode interface using LMH6609MFX with RF and CF selected per diode capacitance-ensuring stability and wide dynamic range.
LMH6609MFX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1400V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 900 MHz
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMH6609MFX FAQ
1.How can I place an order for LMH6609MFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6609MFX 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 LMH6609MFX reliable?
The price and inventory of LMH6609MFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6609MFX is usually 5 days.
3.What payment methods are accepted for LMH6609MFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6609MFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6609MFX?
LMH6609MFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6609MFX 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 LMH6609MFX?
For technical support, including LMH6609MFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6609MFX requirements.
6.How does Aetrix verify that LMH6609MFX is sourced from the original manufacturer or authorized distributors?
All LMH6609MFX 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 LMH6609MFX meets industry standards.
7.What is the process for return or replacement of LMH6609MFX?
All LMH6609MFX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6609MFX, 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 LMH6609MFX part is unused and in its original packaging.
Return procedure for LMH6609MFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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