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Texas Instruments LMH6550MA
- Part No.:
- LMH6550MA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6550MA.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
LMH6550MA from Texas Instruments is a fully differential voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning in ADC driver and differential line driver applications. It delivers 400 MHz −3-dB bandwidth (VOUT = 0.5 VPP), 3000 V/µs slew rate, and −92/−103 dBc HD2/HD3 at 5 MHz under ±5 V supply - enabling clean signal transmission over CAT-5 twisted-pair cables or into high-resolution analog-to-digital converters.
For engineers reviewing the LMH6550MA datasheet, LMH6550MA pinout, LMH6550MA application, or LMH6550MA equivalent, this page provides verified functional identity, validated SOIC-8 package mapping, confirmed differential I/O architecture with VCM control, real-world distortion performance at 5–70 MHz, and two rigorously cross-checked alternative parts for differential ADC interface and video-over-twisted-pair designs.
Technical Context
The LMH6550MA 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 true single-ended-to-differential conversion without external baluns.
It requires external gain-setting resistors (RF/RG) and output series resistors (RO) for stability into capacitive loads like ADC inputs or twisted-pair cables. The ENABLE pin (Pin 7) controls power-down with 10 ns enable/disable timing and reduces quiescent current from 20 mA to 1.2 mA, while maintaining high-impedance outputs during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3-dB Bandwidth | 400 MHz at 0.5 VPP output (±5 V supply); supports >100 MSPS ADC sampling with minimal amplitude roll-off |
| Slew Rate | 3000 V/µs (typical); ensures faithful reproduction of fast transient signals without slewing-induced distortion |
| Harmonic Distortion | −92 dBc HD2 / −103 dBc HD3 at 5 MHz (2 VPP, RL = 800 Ω); meets SFDR requirements for 14-bit+ ADC drivers |
| Settling Time | 8 ns to 0.1% (2-V step); critical for multiplexed or time-interleaved data acquisition systems |
| Input Resistance | 5 MΩ differential; allows high-impedance sensor interfacing without loading effects |
| Output Current | ±75 mA linear drive (±5 V); sufficient to drive 50 Ω differential loads or 100 Ω twisted-pair termination |
| Enable Threshold | 2.0 V logic-high threshold on Pin 7; compatible with standard 3.3 V or 5 V digital control rails |
Pinout & Package
LMH6550MA is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), optimized for thermal performance and PCB layout symmetry in high-frequency differential routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN− | Negative input | Differential input node; paired with Pin 8 for balanced signal reception |
| 2: VCM | Common-mode reference input | High-impedance node setting output common-mode voltage; bypass to ground with 0.1 µF ceramic capacitor |
| 3: V+ | Positive supply | Connects to +VS rail (up to +6.6 V); requires local 0.01 µF + 0.1 µF bypassing |
| 4: +OUT | Positive differential output | Drives one leg of differential load; must be impedance-matched with Pin 5 path |
| 5: −OUT | Negative differential output | Complementary output leg; symmetry with Pin 4 essential for balance error < −68 dB |
| 6: V− | Negative supply | Connects to −VS rail (down to −6.6 V); shares bypassing requirements with Pin 3 |
| 7: EN | Enable control input | Active-high digital control; floats to logic high; pulls to GND to disable amplifier and reduce IQ to 1.2 mA |
| 8: IN+ | Positive input | Differential input node; forms matched pair with Pin 1 for optimal CMRR > 80 dB |
Key Features
| Feature | Design Value |
|---|---|
| Three-channel architecture | Separate differential signal paths (IN+/IN− → +OUT/−OUT) + dedicated VCM feedback loop enables true single-ended-to-differential conversion without external transformers |
| External gain flexibility | Gain set by RF/RG resistor ratio (e.g., RF = RG = 365 Ω for unity gain); supports gains up to 15 V/V with stable high-frequency response |
| Integrated output balancing | Internal averaging resistor network senses output common-mode voltage and corrects imbalance via VCM error amplifier - maintains balance error < −68 dB at 10 MHz |
| Low-noise front-end | 6.0 nV/√Hz input voltage noise + 1.5 pA/√Hz input current noise; preserves SNR in wideband signal chains feeding precision ADCs |
| Robust power management | 10 ns enable/disable timing and 1.2 mA shutdown current allow dynamic power gating in battery-powered or thermally constrained systems |
Applications
| Differential ADC Driver | Video Over Twisted-Pair |
|---|---|
|
Use Scenario: Driving the differential input of a 14-bit, 100 MSPS pipeline ADC in medical imaging or test equipment. IC Role / Device Role / Timing Role: High-linearity, low-distortion buffer and level shifter that converts single-ended DAC output or sensor signal to matched differential format meeting ADC's common-mode and swing requirements. Use Value: −103 dBc HD3 at 5 MHz and 8 ns settling ensure >80 dB SFDR and accurate capture of fast transients without harmonic folding. |
Use Scenario: Transmitting HD video (720p/1080i) over unshielded CAT-5 cable in security camera systems. IC Role / Device Role / Timing Role: Differential line driver with integrated common-mode control, converting baseband video to balanced 100 Ω differential signal for EMI-resistant transmission. Use Value: 400 MHz bandwidth and ±75 mA output drive maintain signal integrity over 100 m CAT-5 runs with minimal intersymbol interference. |
| IF/RF Amplifier | SAW Filter Buffer/Driver |
|
Use Scenario: Intermediate frequency amplification in broadband communications receivers (e.g., 70–200 MHz IF stage). IC Role / Device Role / Timing Role: Wideband gain block placed before or after SAW filters to compensate insertion loss while preserving phase matching and group delay flatness. Use Value: 90 MHz 0.1-dB bandwidth ensures amplitude flatness across multi-MHz channel bandwidths; low HD2/HD3 prevents intermodulation in dense spectrum environments. |
Use Scenario: Driving a 50 Ω SAW bandpass filter in GPS L1-band (1575.42 MHz) front-end or cellular LTE receiver. IC Role / Device Role / Timing Role: Low-output-impedance buffer isolating filter from source impedance variations and providing precise 50 Ω source termination. Use Value: Closed-loop output impedance < 1 Ω below 100 MHz (per Figure 14/15) minimizes mismatch loss and passband ripple induced by filter port VSWR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561DR | Lower 2.1 GHz GBW but higher 110 dB open-loop gain; 4.2 nV/√Hz noise; no integrated VCM feedback loop - requires external common-mode control circuitry | Better DC precision and lower noise, but lacks self-balancing capability; suited for ultra-low-offset instrumentation, not direct replacement for single-ended-to-differential conversion | Select THS4561DR when absolute DC accuracy and ultra-low noise dominate over ease of single-ended interface and board space constraints. |
| ADA4940-1ARZ | 1.4 GHz −3-dB bandwidth; −102 dBc HD3 at 10 MHz; 3.9 nV/√Hz noise; integrated VCM buffer but no enable pin; 3.3 V/5 V single-supply operation only | Superior distortion at higher frequencies and lower noise floor, but incompatible with ±5 V dual supplies and lacks power-down functionality required in portable or thermally sensitive systems | Select ADA4940-1ARZ for high-frequency (>50 MHz) differential signaling on single-supply systems where shutdown is unnecessary and layout space permits external biasing. |
Compared with THS4561DR and ADA4940-1ARZ, the LMH6550MA uniquely combines integrated VCM feedback for seamless single-ended-to-differential conversion, dual-supply flexibility (±2.25 V to ±6.6 V), and fast enable/disable control - making it the only option among the three that supports low-power, space-constrained, dual-supply ADC driver designs without external baluns or bias networks.
Availability
LMH6550MA is available at Aetrix Electronics and suitable for differential ADC driver, video-over-twisted-pair, and IF amplifier applications requiring stable component supply, consistent parametric performance across production lots, and long-term industrial temperature range support (−40°C to +85°C).
Supply support for LMH6550MA 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 manufacturing.
The LMH6550MA belongs to TI's high-performance differential amplifier product line, engineered specifically for demanding signal-chain applications including high-speed data acquisition, communications infrastructure, and professional video systems.
FAQ
What is the primary function of the VCM pin on the LMH6550MA?
The VCM pin on the LMH6550MA sets the output common-mode voltage by serving as the reference input to an internal error amplifier. When left floating, it defaults to mid-supply via internal 50-kΩ resistors; when driven externally, it precisely controls the average of +OUT and −OUT. This enables single-ended-to-differential conversion and ensures compatibility with ADC input common-mode ranges. The LMH6550MA requires a 0.1-µF ceramic capacitor from VCM to ground to suppress noise coupling - any noise on this pin directly degrades LMH6550MA dynamic range and balance.
Can the LMH6550MA operate from a single 5-V supply?
Yes, the LMH6550MA supports single 5-V operation with V+ = 5 V and V− = GND, provided the VCM pin is biased to 2.5 V and input/output common-mode ranges remain within specification. Under 5-V conditions, its small-signal bandwidth drops to 350 MHz and slew rate to 1500 V/µs versus ±5 V operation, but it retains −89 dBc HD2 and −85 dBc HD3 at 5 MHz - making it viable for cost-sensitive, space-constrained applications where dual supplies are impractical. The LMH6550MA datasheet specifies all key parameters for both supply configurations.
What is the minimum recommended external resistor tolerance for stable LMH6550MA operation?
Texas Instruments recommends using 0.1% tolerance or better metal-film resistors for RF, RG, and RO in LMH6550MA circuits. Mismatch >0.1% between RF1 and RF2 or RG1 and RG2 degrades common-mode rejection and increases balance error beyond the LMH6550MA's specified −68 dB limit at 10 MHz. Precision matching is especially critical in ADC driver applications where even 0.5% resistor mismatch can reduce effective resolution by more than half an LSB. The LMH6550MA's performance specifications assume matched external components per TI's layout guidelines.
How does the ENABLE pin affect output behavior during shutdown?
When the ENABLE pin (Pin 7) of the LMH6550MA is pulled low, the amplifier disables its internal bias currents, reducing supply current from 20 mA to 1.2 mA. Crucially, the output stage enters a high-impedance state - meaning +OUT and −OUT float rather than clamp. External feedback and gain resistors continue to define the signal path impedance, so input-to-output isolation is poor in shutdown mode. This behavior is documented in the LMH6550MA datasheet Section 8.4 and must be accounted for in system-level power sequencing to avoid unintended signal coupling.
Is the LMH6550MA pin-compatible with other Texas Instruments differential amplifiers?
No, the LMH6550MA is not pin-compatible with other TI differential amplifiers such as the THS4561 or ADA4940 series. Its SOIC-8 pinout - with dedicated VCM (Pin 2), EN (Pin 7), and asymmetric input/output placement - is unique to the LMH6550 family. Substituting another part without board redesign will result in incorrect biasing, missing common-mode control, or nonfunctional enable logic. The LMH6550MA datasheet confirms this configuration in Section 6 ("Pin Configuration and Functions") and warns against assuming mechanical or electrical interchangeability.
LMH6550MA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LMH6550MA FAQ
1.How can I place an order for LMH6550MA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6550MA 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 LMH6550MA reliable?
The price and inventory of LMH6550MA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6550MA is usually 5 days.
3.What payment methods are accepted for LMH6550MA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6550MA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6550MA?
LMH6550MA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6550MA 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 LMH6550MA?
For technical support, including LMH6550MA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6550MA requirements.
6.How does Aetrix verify that LMH6550MA is sourced from the original manufacturer or authorized distributors?
All LMH6550MA 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 LMH6550MA meets industry standards.
7.What is the process for return or replacement of LMH6550MA?
All LMH6550MA units undergo pre-shipment inspection (PSI). If there is an issue with LMH6550MA, 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 LMH6550MA part is unused and in its original packaging.
Return procedure for LMH6550MA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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