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Texas Instruments LMH6609MA
- Part No.:
- LMH6609MA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6609MA.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,889
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Product details
Overview
LMH6609MA 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 supply), 1400 V/µs slew rate, 90 mA linear output current, and 0.01%/0.026° differential gain/phase - enabling single-supply or dual-supply composite video line driving with minimal distortion.
For engineers reviewing the LMH6609MA datasheet, LMH6609MA pinout, LMH6609MA application, or LMH6609MA equivalent, key selection criteria include its voltage-feedback architecture, SOIC-8 package compatibility, ±3.3 V to ±6 V supply range, low 3.1 nV/√Hz input voltage noise, and guaranteed large-signal bandwidth performance across temperature.
Technical Context
The LMH6609MA employs a voltage-feedback topology with symmetrical, balanced inputs and matched bias currents - enabling precise DC offset control via input impedance balancing. Its unity-gain stability eliminates need for external compensation in buffer or gain-of-1 configurations.
It features a 240 MHz gain-bandwidth product (GBP), where closed-loop bandwidth approximates GBP/AV for AV ≥ 5; for lower gains, large-signal slew rate (1400 V/µs) governs usable bandwidth. Output drive capability is enhanced by low 0.3 Ω closed-loop output resistance and internal current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth (AV = 1) | 900 MHz at ±5 V supply, 0.25 VPP output - supports ultra-wideband signal conditioning without peaking or instability. |
| Slew Rate | 1400 V/µs (typical), enabling clean 4 VPP step response in ≤2.6 ns - critical for fast pulse fidelity in test equipment and ADC drivers. |
| Linear Output Current | ±90 mA - drives multiple 75 Ω video loads or long coaxial cables without clipping or thermal shutdown. |
| Differential Gain / Phase | 0.01% / 0.026° at 4.43 MHz, PAL-compliant - ensures broadcast-grade color accuracy in analog video systems. |
| Input Voltage Noise | 3.1 nV/√Hz (>1 MHz) - preserves SNR in low-noise IF amplification and transimpedance photodiode interfaces. |
| Supply Current | 7.0 mA (typical, ±5 V, no load) - balances high-speed performance with power efficiency in portable or remote instrumentation. |
| Input Offset Voltage | ±0.8 mV (max, ±5 V) - enables precision DC-coupled gain stages without significant output error accumulation. |
Pinout & Package
LMH6609MA is housed in an 8-pin SOIC (Package D, JEDEC MS-012AA) with exposed pad not present. Thermal resistance is θJA = 145°C/W and θJC = 65°C/W. Pin 1 is marked with a beveled corner or dot; device orientation follows standard SOIC top-view convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No internal connection - must remain unconnected; floating or tied to ground degrades high-frequency PSRR. |
| 2 | Inverting Input (−IN) | High-impedance, symmetrical input node; requires matched source impedance to +IN for optimal DC offset cancellation. |
| 3 | Non-Inverting Input (+IN) | High-impedance, symmetrical input node; bias current matching with −IN enables <1 mV offset when impedances balanced. |
| 4 | V− | Negative supply rail; requires local 10 µF tantalum + 0.01 µF ceramic bypass to ground for stable high-frequency operation. |
| 5 | Output | Low-impedance, current-limited output capable of ±90 mA into resistive or capacitive loads; ROUT series resistor recommended for >10 pF loads. |
| 6 | V+ | Positive supply rail; same bypassing requirements as V−; supports ±3.3 V to ±6 V operation with monotonic performance scaling. |
| 7 | N/C | No internal connection - must remain unconnected; routing traces here introduces parasitic coupling. |
| 8 | N/C | No internal connection - must remain unconnected; violates layout best practices if used as thermal pad or ground tie. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback architecture | Enables flexible gain configuration (inverting/non-inverting/buffer) without stability trade-offs - unlike current-feedback op-amps requiring fixed feedback resistors. |
| Unity-gain stable design | Operates reliably with AV = 1 without external compensation components - simplifies PCB layout and reduces BOM count in video buffers and integrators. |
| Matched input bias currents | Minimizes input offset drift over temperature; allows DC accuracy optimization via simple resistor balancing on both inputs. |
| Low 3.1 nV/√Hz voltage noise | Maintains signal integrity in wideband IF amplifiers and transimpedance photodiode receivers where input-referred noise dominates system SNR. |
| 0.01%/0.026° differential gain/phase | Meets PAL broadcast video specifications - ensures accurate luminance/chrominance separation without hue/saturation distortion in RGB or YUV distribution. |
Applications
| Video Line Driver | IF Amplifier |
|---|---|
|
Use Scenario: Driving multiple 75 Ω coaxial video lines from a single PAL encoder output in broadcast monitoring equipment. IC Role / Device Role / Timing Role: High-current, low-distortion buffer stage with back-termination support and flat frequency response up to 900 MHz. Use Value: Eliminates need for discrete emitter followers or transformer coupling while preserving 0.01% differential gain for color fidelity. |
Use Scenario: Amplifying 40–200 MHz intermediate frequency signals in software-defined radio front-ends before ADC sampling. IC Role / Device Role / Timing Role: Wideband, low-noise gain block with 240 MHz GBP and 1400 V/µs slew rate to preserve modulation envelope integrity. Use Value: Enables direct IF sampling at 250 MSPS without baseband downconversion, reducing component count and phase noise contribution. |
| Active Filter | A/D Input Driver |
|
Use Scenario: Implementing a 2nd-order Sallen-Key low-pass filter at 100 MHz cutoff for anti-aliasing in high-speed data acquisition systems. IC Role / Device Role / Timing Role: Unity-gain stable voltage-feedback op-amp configured as filter integrator with precise pole placement. Use Value: Achieves 100 MHz cutoff with <0.5 dB passband ripple and monotonic roll-off - avoids group delay distortion common in compensated alternatives. |
Use Scenario: Driving the input of a 12-bit, 100 MSPS pipeline ADC with full-scale 2 VPP differential sine wave input. IC Role / Device Role / Timing Role: Low-output-impedance, fast-settling driver delivering 15 ns settling to 0.05% with minimal harmonic distortion. Use Value: Prevents missing codes and ENOB degradation caused by ADC aperture uncertainty or source impedance mismatch. |
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 |
|---|---|---|---|
| LMH6629MA | Higher 1.5 GHz bandwidth but requires gain ≥ +5 for stability; 12 mA supply current; 2.9 nV/√Hz noise. | Better suited for fixed-gain IF amplification >200 MHz; not unity-gain stable - unsuitable for video buffers or integrators. | Select LMH6629MA only when closed-loop gain ≥ +5 is acceptable and higher bandwidth justifies increased power and layout complexity. |
| THS3201D | Current-feedback architecture; 1.8 GHz bandwidth; 3000 V/µs slew rate; ±15 V supply capable; 10 mA ICC. | Requires fixed 500 Ω feedback resistor; unstable at AV = 1; superior for fixed-gain, high-Z load driving above 500 MHz. | Choose THS3201D for ultra-high-frequency fixed-gain amplification where input impedance matching and gain flexibility are secondary to raw speed. |
Compared with LMH6609MA, LMH6629MA offers higher bandwidth but sacrifices unity-gain stability and increases supply current, while THS3201D delivers extreme slew rate and bandwidth at the cost of inflexible feedback architecture and no DC-coupled low-gain operation.
Availability
LMH6609MA is available at Aetrix Electronics and suitable for video line driving, IF amplification, and active filter applications requiring stable component supply, consistent parametric performance across temperature, and long-term industrial lifecycle support.
Supply support for LMH6609MA 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 op amp design and manufacturing.
The LMH6609MA belongs to TI's LMH high-speed amplifier family, engineered specifically for broadcast video, instrumentation, and communications infrastructure where bandwidth, linearity, and low distortion are non-negotiable.
FAQ
What supply voltage range does the LMH6609MA support?
The LMH6609MA operates from ±3.3 V to ±6 V dual supplies (6.6 V to 12 V total). Performance is fully specified at ±5 V and ±3.3 V, with bandwidth and slew rate scaling predictably across this range. Operation outside this range risks exceeding absolute maximum ratings and invalidating parametric guarantees.
Is the LMH6609MA unity-gain stable, and what does that mean for circuit design?
Yes, the LMH6609MA is unity-gain stable - it remains stable with closed-loop gain AV = +1 or −1 without external compensation. This allows direct use as a voltage follower or inverting buffer without added capacitors or resistors, simplifying layout and improving transient response in video and test equipment circuits.
Can the LMH6609MA drive 75 Ω video loads directly, and how is differential gain affected?
Yes, the LMH6609MA delivers ±90 mA linear output current and is explicitly characterized for 75 Ω video loads. At 4.43 MHz, it achieves 0.01% differential gain and 0.026° differential phase under RL = 150 Ω (back-terminated 75 Ω), meeting PAL broadcast standards without external equalization.
What is the recommended feedback resistor value for the LMH6609MA, and why?
Texas Instruments recommends ~250 Ω for RF in non-inverting or inverting configurations at AV ≥ +2 or ≤ −1. Values significantly above 250 Ω increase sensitivity to parasitic capacitance and cause peaking; values below 100 Ω overload the output stage, reducing swing and increasing distortion. For AV = 1, short the output to −IN directly.
Does the LMH6609MA require special layout considerations for high-frequency stability?
Yes - TI specifies removal of ground plane near input/output pins to minimize parasitic capacitance, minimization of all trace lengths, and local bypassing with 10 µF tantalum + 0.01 µF ceramic per supply rail. These practices prevent oscillation and preserve the 900 MHz bandwidth and 1400 V/µs slew rate in real-world PCB implementations.
LMH6609MA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 8-SOIC
LMH6609MA FAQ
1.How can I place an order for LMH6609MA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6609MA 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 LMH6609MA reliable?
The price and inventory of LMH6609MA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6609MA is usually 5 days.
3.What payment methods are accepted for LMH6609MA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6609MA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6609MA?
LMH6609MA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6609MA 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 LMH6609MA?
For technical support, including LMH6609MA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6609MA requirements.
6.How does Aetrix verify that LMH6609MA is sourced from the original manufacturer or authorized distributors?
All LMH6609MA 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 LMH6609MA meets industry standards.
7.What is the process for return or replacement of LMH6609MA?
All LMH6609MA units undergo pre-shipment inspection (PSI). If there is an issue with LMH6609MA, 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 LMH6609MA part is unused and in its original packaging.
Return procedure for LMH6609MA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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