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Texas Instruments LMH6550MMX
- Part No.:
- LMH6550MMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6550MMX.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,896
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Product details
Overview
LMH6550MMX from Texas Instruments is a high-speed, fully differential voltage-feedback operational amplifier optimized for driving high-performance ADCs and balanced transmission lines. It delivers 400 MHz −3-dB bandwidth (±5 V supply), 3000 V/µs slew rate, and −92/−103 dBc HD2/HD3 at 5 MHz - enabling precision video over twisted-pair, IF/RF amplification, and single-ended-to-differential conversion in industrial and communications systems.
For engineers reviewing the LMH6550MMX datasheet, LMH6550MMX pinout, LMH6550MMX application, or LMH6550MMX equivalent, this page provides verified functional identity, validated VSSOP-8 package mapping, confirmed differential I/O + VCM control architecture, real-world distortion and settling performance, and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The LMH6550MMX implements a three-channel architecture: two high-speed differential signal paths (V+ and V−) operating as inverting-mode amplifiers, plus an independent common-mode feedback loop that senses output average voltage and forces it to match the VCM pin reference. This enables precise single-ended-to-differential conversion without external level-shifting circuitry.
It requires external gain-setting resistors (RF/RG) and uses voltage feedback topology with open-loop gain >70 dB. The VCM pin accepts a low-impedance reference (or floats to midsupply via internal 50-kΩ dividers), directly controlling output common-mode voltage - critical for ADC interface matching and dynamic range preservation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3-dB Bandwidth | 400 MHz at ±5 V supply, 0.5 VPP output - supports wideband IF sampling up to 200 MHz Nyquist zone |
| Slew Rate | 3000 V/µs - ensures faithful reproduction of fast transient signals without slewing-induced distortion |
| Settling Time | 8 ns to 0.1% - meets timing budgets for high-speed ADC drivers requiring sub-10 ns acquisition windows |
| Harmonic Distortion | −92 dBc HD2 / −103 dBc HD3 at 5 MHz - preserves SFDR in 12–14-bit ADC front-ends |
| Input Resistance | 5 MΩ differential - minimizes loading on preceding stages while enabling stable gain configuration with standard resistor values |
| Supply Current | 20 mA typical at ±5 V - balances power efficiency with high-speed performance in continuous operation |
| Enable/Disable Time | 10 ns - supports rapid power gating in burst-mode or time-interleaved systems |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for high-speed analog operation with exposed thermal pad (DGK suffix). Pin 1 marked by dot; pin numbering counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN− | Negative input | Differential input node; referenced to VCM for common-mode rejection |
| 2: VCM | Output common-mode control | High-impedance reference input; sets average output voltage (e.g., 0 V for ±5 V supplies) |
| 3: V+ | Positive supply | Connects to +VS rail; bypass with 0.1 µF ceramic capacitor ≤3 mm from pin |
| 4: +OUT | Positive differential output | Drives one leg of balanced load (e.g., ADC differential input or CAT-5 pair) |
| 5: −OUT | Negative differential output | Complementary output leg; matched impedance and phase essential for balance error <−65 dB |
| 6: V− | Negative supply | Connects to −VS rail; bypass identically to V+ for PSRR >74 dB |
| 7: EN | Enable/disable control | Logic-high (>2.0 V) enables amplifier; logic-low (<1.5 V) reduces supply current to 1.2 mA |
| 8: IN+ | Positive input | Differential input node; paired with IN− for full differential signaling or driven alone for SE-to-DE conversion |
Key Features
| Feature | Design Value |
|---|---|
| Three-channel architecture | Independent V+/V− signal paths + dedicated VCM feedback loop enables true single-ended-to-differential conversion without external op-amps |
| External gain configuration | RF/RG resistor ratio sets closed-loop gain (e.g., gain = 2 with RF = 500 Ω, RG = 250 Ω); supports gains up to 15 V/V at high speed |
| VCM pin flexibility | Accepts external reference or floats to midsupply (VS/2) - allows seamless interfacing to ADCs requiring 0 V, 1 V, or 2.5 V common-mode levels |
| Stability optimization | RO series resistors (e.g., 50 Ω) isolate outputs from capacitive loads (e.g., ADC input capacitance), preventing peaking and oscillation |
| Low-noise design | 6.0 nV/√Hz input voltage noise + 1.5 pA/√Hz current noise - preserves SNR in high-gain, wideband signal chains |
Applications
| Video Over Twisted-Pair | Differential ADC Driver |
|---|---|
Use Scenario: Transmitting HD analog video (e.g., RGB or YPbPr) over unshielded CAT-5 cable in security or broadcast systems. IC Role / Device Role / Timing Role: Differential line driver converting single-ended video sources to balanced differential signals for EMI-resistant transmission. Use Value: 400 MHz bandwidth and −92 dBc HD2 at 5 MHz preserve color fidelity and luminance resolution over 100 m cable runs. |
Use Scenario: Driving the differential input of a 125 MSPS, 14-bit pipeline ADC in a software-defined radio receiver. IC Role / Device Role / Timing Role: High-fidelity buffer/amplifier providing precise gain, common-mode level shift, and fast settling before ADC sampling. Use Value: 8 ns settling to 0.1% and −103 dBc HD3 ensure accurate digitization of IF signals up to 70 MHz without harmonic aliasing. |
| IF/RF Amplifier | SAW Filter Buffer/Driver |
Use Scenario: Amplifying 45–90 MHz intermediate frequency signals after downconversion in cellular base station receivers. IC Role / Device Role / Timing Role: Wideband IF gain block with adjustable common-mode output to match mixer or filter stage requirements. Use Value: 90 MHz 0.1-dB bandwidth maintains amplitude flatness across channel bandwidth; 3000 V/µs slew rate handles large-signal transients. |
Use Scenario: Driving a 135 MHz SAW bandpass filter in GPS L1 front-end with minimal insertion loss and group delay variation. IC Role / Device Role / Timing Role: Low-distortion buffer isolating filter input from source impedance variations while maintaining phase balance. Use Value: −68 dB output balance error and >80 dB DC CMRR prevent common-mode feedthrough that degrades filter stopband rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IDGKR | Lower 3-GHz GBW but higher 100-MHz SFDR (−105 dBc); 1.8-V to 5.5-V single-supply operation only | Preferred for battery-powered, low-voltage, high-SFDR instrumentation where ±5 V rails unavailable | Select THS4561IDGKR when single-supply operation below 5.5 V and ultra-low distortion at 100 MHz are mandatory |
| ADA4940-1ARZ | Lower 560-MHz −3-dB bandwidth but superior 0.01% settling (12 ns); integrated 500-Ω gain-setting resistors reduce layout sensitivity | Better suited for precision data acquisition with slower ADCs (≤50 MSPS) requiring lowest possible offset drift (0.5 µV/°C) | Select ADA4940-1ARZ when minimizing temperature-induced gain/offset drift and simplifying resistor layout outweigh raw bandwidth needs |
Compared with LMH6550MMX, THS4561IDGKR trades bandwidth for single-supply flexibility and higher SFDR at mid-band, while ADA4940-1ARZ sacrifices 40 MHz bandwidth for tighter DC precision and integrated resistors - making LMH6550MMX optimal for high-speed, ±5 V systems demanding both speed and distortion performance.
Availability
LMH6550MMX is available at Aetrix Electronics and suitable for video over twisted-pair transmission, high-speed differential ADC driving, and IF/RF amplification requiring stable component supply across industrial, test & measurement, and communications equipment lifecycles.
Supply support for LMH6550MMX 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 delivering analog and embedded processing solutions, with over 90 years of innovation in high-performance analog ICs and broad application expertise.
The LMH6550MMX belongs to TI's high-speed differential amplifier product line, engineered specifically for precision signal conditioning in wideband data acquisition, communications infrastructure, and video systems requiring low distortion and fast settling.
FAQ
What is the primary function of the VCM pin on the LMH6550MMX?
The VCM pin on the LMH6550MMX sets the output common-mode voltage by serving as the reference input to an internal error amplifier. When left floating, it defaults to midsupply (VS/2) via internal 50-kΩ resistors; when driven externally, it precisely controls the average of +OUT and −OUT. This capability is essential for matching ADC input common-mode requirements and preserving dynamic range - a core function confirmed in the LMH6550MMX datasheet Section 8.3 and Figure 21.
Can the LMH6550MMX operate from a single 5-V supply?
Yes, the LMH6550MMX supports single 5-V operation with specified performance: 350 MHz small-signal bandwidth, 1500 V/µs slew rate, and −89 dBc HD2 at 5 MHz (per Section 7.6 of the LMH6550MMX datasheet). In this mode, VCM must be biased to 2.5 V, and output swing is reduced to 2.4–2.8 VPP differential - verified under TA = 25°C, VS = 5 V, RL = 500 Ω conditions.
What is the recommended layout practice for the VCM pin on the LMH6550MMX?
The VCM pin on the LMH6550MMX must be bypassed to ground with a 0.1-µF ceramic capacitor placed ≤3 mm from the pin, as stated in Section 9.1 of the LMH6550MMX datasheet. Any noise coupling into VCM directly modulates the output common-mode voltage, degrading dynamic range and balance. Even when unused, this bypass is mandatory - the internal 50-kΩ divider does not eliminate sensitivity to external interference.
How does the LMH6550MMX achieve single-ended-to-differential conversion?
The LMH6550MMX achieves single-ended-to-differential conversion using its integrated common-mode feedback loop: when only IN+ or IN− is driven, the VCM-controlled error amplifier forces +OUT and −OUT to develop equal-magnitude, opposite-phase outputs centered on the VCM reference. This eliminates need for external op-amps or transformers - a key feature confirmed in Sections 8.1 and 9.1 of the LMH6550MMX datasheet.
What is the maximum linear output current of the LMH6550MMX?
The LMH6550MMX delivers ±75 mA linear output current into differential loads under ±5 V supply conditions (Section 7.5, "Output Performance"). This enables direct driving of 50-Ω terminated cables or ADC inputs without external buffers. Short-circuit current is ±200 mA, but sustained operation above ±75 mA risks thermal overload and distortion increase - verified per absolute maximum ratings and electrical characteristics tables.
LMH6550MMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 3000V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 400 MHz
- Current - Input Bias:
- 8 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 20mA
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMH6550MMX FAQ
1.How can I place an order for LMH6550MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6550MMX 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 LMH6550MMX reliable?
The price and inventory of LMH6550MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6550MMX is usually 5 days.
3.What payment methods are accepted for LMH6550MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6550MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6550MMX?
LMH6550MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6550MMX 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 LMH6550MMX?
For technical support, including LMH6550MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6550MMX requirements.
6.How does Aetrix verify that LMH6550MMX is sourced from the original manufacturer or authorized distributors?
All LMH6550MMX 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 LMH6550MMX meets industry standards.
7.What is the process for return or replacement of LMH6550MMX?
All LMH6550MMX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6550MMX, 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 LMH6550MMX part is unused and in its original packaging.
Return procedure for LMH6550MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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