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Texas Instruments LMH6655MA-TI
- Part No.:
- LMH6655MA-TI
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6655MA-TI.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
LMH6655MA-TI from Texas Instruments (formerly National Semiconductor) is a dual-channel, voltage-feedback operational amplifier optimized for high-speed, low-noise signal conditioning in ±2.5V to ±6V supplies. It delivers 250 MHz unity-gain bandwidth, 200 V/µs slew rate, and 4.5 mA/channel supply current, with input voltage noise of 4.5 nV/√Hz and output swing of ±3.6 V into 100 Ω - enabling precision ADC driving and video signal amplification.
For engineers reviewing the LMH6655MA-TI datasheet, LMH6655MA-TI pinout, LMH6655MA-TI application, or LMH6655MA-TI equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and layout implications.
Technical Context
The LMH6655MA-TI employs a voltage-feedback architecture on National's VIP10™ complementary bipolar process, supporting unity-gain stable operation up to 250 MHz. Its input common-mode range extends 150 mV below the negative rail and within 1.3 V of the positive rail, enabling true single-supply operation down to +2.5V total supply (±1.25V).
It features low distortion (−85 dBc third harmonic at 5 MHz), 25 ns 0.01% settling time, and channel-to-channel crosstalk of −80 dB at 5 MHz - confirming suitability for dual-path analog signal chains requiring isolation and matched dynamic response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 250 MHz - supports wideband video, xDSL, and fast-settling ADC driver designs without stability compromise. |
| Slew Rate | 200 V/µs - enables clean reproduction of >100 MHz small-signal transients and fast large-signal transitions. |
| Input Voltage Noise | 4.5 nV/√Hz - preserves SNR in low-level sensor and preamp stages where thermal noise dominates. |
| Supply Current per Channel | 4.5 mA - allows dual-channel high-speed amplification in power-constrained portable instrumentation. |
| Output Swing (RL = 100 Ω) | −3.6 V to +3.4 V - delivers full-scale drive into standard 75 Ω/100 Ω loads without clipping near rails. |
| Crosstalk (Channel-to-Channel) | −80 dB at 5 MHz - ensures minimal interference between channels in dual-filter or differential receiver applications. |
| Settling Time (0.01%) | 25 ns - meets timing budgets for 10+ MS/s data acquisition systems with tight aperture uncertainty requirements. |
Pinout & Package
LMH6655MA-TI is housed in an 8-pin MSOP package (NS Package Number MUA08A), with exposed pad for thermal enhancement. Pin spacing is 0.5 mm, body dimensions 3.0 mm × 3.0 mm × 1.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Channel A output | Low-impedance, rail-to-rail capable output stage; requires isolation resistor when driving >100 pF loads. |
| 2 (−IN A) | Inverting input A | High-impedance node sensitive to parasitic capacitance; must be routed away from ground/power planes to avoid peaking. |
| 3 (+IN A) | Non-inverting input A | DC-coupled input with CMVR from −5.15 V to +3.7 V (±5 V supply); bias current 5–18 µA typical. |
| 4 (V−) | Negative supply | Connects to system ground or negative rail; bypass with 0.1 µF ceramic + 10 µF tantalum for HF stability. |
| 5 (V+) | Positive supply | Accepts +2.5 V to +6 V (single-supply) or ±2.5 V to ±6 V (dual-supply); PSRR = 76 dB typical. |
| 6 (+IN B) | Non-inverting input B | Independent channel input; matches Channel A specs including offset drift (6 µV/°C) and CMRR ≥ 68 dB. |
| 7 (−IN B) | Inverting input B | Electrically identical to Pin 2; crosstalk to Pin 2 is −80 dB at 5 MHz - critical for dual-path isolation. |
| 8 (OUT B) | Channel B output | Matched dynamic performance to OUT A; same slew rate, bandwidth, and load drive capability. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback architecture | Enables predictable gain-bandwidth tradeoff and stable unity-gain operation without external compensation. |
| True single-supply capability | Input CMVR includes ground (−0.15 V to +3.7 V at +5 V supply), allowing direct interface with SAR ADCs and sensors. |
| Low 1/f noise corner | Input voltage noise flat at 4.5 nV/√Hz above 0.1 MHz - ideal for wideband IF amplification and pulse amplification. |
| Matched dual-channel performance | Channel-to-channel gain mismatch <0.1%, offset drift tracking <1 µV/°C, and crosstalk ≤−80 dB ensure coherent dual-path signal processing. |
| Robust capacitive load drive | Stable with ≥500 pF loads when using recommended 50 Ω isolation resistor - simplifies PCB layout for video line drivers. |
Applications
| ADC Drivers | Consumer Video |
|---|---|
|
Use Scenario: Driving 12-bit, 10 MS/s SAR ADC inputs in portable test equipment. IC Role / Device Role / Timing Role: Buffer and level-shift analog sensor outputs to match ADC input range while minimizing settling error and noise addition. Use Value: 25 ns 0.01% settling and 4.5 nV/√Hz noise ensure <0.5 LSB integral nonlinearity error and >72 dB SNR at full scale. |
Use Scenario: RGB signal amplification in HDMI source devices before cable driver stage. IC Role / Device Role / Timing Role: Dual-channel DC-coupled video buffer with gain = +2, preserving sync pulse integrity and color fidelity. Use Value: −0.01% differential gain and 0.025° differential phase error meet NTSC/PAL broadcast-grade linearity requirements. |
| Active Filters | xDSL Receivers |
|
Use Scenario: 4th-order Butterworth low-pass filter for anti-aliasing in audio CODECs. IC Role / Device Role / Timing Role: Dual op-amp implementing two 2-pole sections with matched component sensitivity. Use Value: 250 MHz GBW and 200 V/µs slew rate maintain filter Q-factor and passband flatness up to 10 MHz. |
Use Scenario: Line receiver front-end in ADSL2+ CPE modems, amplifying received DSL signals from hybrid coupler. IC Role / Device Role / Timing Role: Low-noise, high-linearity gain block operating from ±5 V supply with broadband noise rejection. Use Value: −85 dBc third-harmonic distortion at 5 MHz and −80 dB crosstalk prevent upstream/downstream signal contamination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6655MM-TI | Same die, identical electrical specs; differs only in tape-and-reel packaging (3.5k units vs. 95-unit rail). | No functional or layout impact; suitable for automated SMT assembly where reel format required. | Select LMH6655MM-TI for volume production; LMH6655MA-TI preferred for prototyping and low-volume builds. |
| THS3202DGN-TI | Higher supply current (11 mA/ch), higher slew rate (3000 V/µs), wider bandwidth (1.8 GHz), but higher noise (11 nV/√Hz). | Better for ultrafast pulse amplification; less suitable for low-noise, battery-powered ADC drivers. | Choose THS3202DGN-TI only when >1 GHz bandwidth is mandatory; LMH6655MA-TI remains optimal for noise-sensitive 250 MHz applications. |
Compared with LMH6655MA-TI, LMH6655MM-TI offers identical performance in reel format for production scalability, while THS3202DGN-TI trades 2.5× higher power and 2.4× higher noise for 7× greater bandwidth - making LMH6655MA-TI the balanced choice for portable, low-noise, 250 MHz signal chains.
Availability
LMH6655MA-TI is available at Aetrix Electronics and suitable for ADC driver circuits, consumer video signal paths, active filter implementations, and xDSL receiver front-ends requiring stable component supply, consistent parametric performance across temperature, and long-term industrial lifecycle support.
Supply support for LMH6655MA-TI 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 acquired National Semiconductor in 2011 and maintains full product support, datasheets, and application engineering for legacy VIP10™-based amplifiers.
The LMH6655MA-TI belongs to TI's high-speed, low-noise op-amp portfolio designed for precision analog signal conditioning in portable instrumentation, communications infrastructure, and broadcast video systems.
FAQ
What supply voltage ranges does the LMH6655MA-TI support?
The LMH6655MA-TI operates from ±2.5 V to ±6 V dual supply or +2.5 V to +12 V single supply. At ±5 V, it delivers full 250 MHz bandwidth and 200 V/µs slew rate; minimum supply is ±2.5 V (5 V total), where bandwidth reduces to 230 MHz and slew rate to 190 V/µs per the 5 V electrical characteristics table. The LMH6655MA-TI maintains rail-to-rail output swing and input common-mode range down to these limits.
Is the LMH6655MA-TI unity-gain stable?
Yes, the LMH6655MA-TI is explicitly designed for unity-gain stable operation with a measured phase margin of 50° at AV = +1 and ±5 V supply. Its voltage-feedback architecture and internal compensation ensure stability without external components across all gains ≥ +1, as confirmed by closed-loop bandwidth plots and settling time specifications in the datasheet.
What is the input common-mode voltage range for the LMH6655MA-TI?
At ±5 V supply, the LMH6655MA-TI input common-mode voltage range is −5.15 V to +3.7 V (CMRR ≥ 50 dB). In single-supply +5 V operation, the range is −0.15 V to +3.7 V - extending 150 mV below ground and within 1.3 V of V+, enabling direct interfacing with ground-referenced sensors and ADCs without level-shifting circuitry.
Does the LMH6655MA-TI require external compensation?
No, the LMH6655MA-TI is internally compensated for unity-gain stability and requires no external compensation components. Its VIP10™ process and fixed compensation network guarantee ≥50° phase margin and monotonic step response across all standard gains (+1 to +10) and supply voltages (±2.5 V to ±6 V), as validated by the phase margin, overshoot, and settling time data in the Electrical Characteristics tables.
How does the LMH6655MA-TI handle capacitive loads?
The LMH6655MA-TI can drive capacitive loads up to 500 pF when a 50 Ω isolation resistor is placed in series with the output, as specified in the "Driving Capacitive Loads" section. Without RISO, loads >100 pF may cause peaking or oscillation due to reduced phase margin; the isolation resistor dampens resonance by isolating the amplifier's inductive output impedance from the load capacitance, ensuring stable pulse response.
LMH6655MA-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 200V/µs
- Gain Bandwidth Product:
- 260 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 4.5mA (x2 Channels)
- Current - Output / Channel:
- 120 mA
- Voltage - Supply Span (Min):
- 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
LMH6655MA-TI FAQ
1.How can I place an order for LMH6655MA-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6655MA-TI 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 LMH6655MA-TI reliable?
The price and inventory of LMH6655MA-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6655MA-TI is usually 5 days.
3.What payment methods are accepted for LMH6655MA-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6655MA-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6655MA-TI?
LMH6655MA-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6655MA-TI 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 LMH6655MA-TI?
For technical support, including LMH6655MA-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6655MA-TI requirements.
6.How does Aetrix verify that LMH6655MA-TI is sourced from the original manufacturer or authorized distributors?
All LMH6655MA-TI 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 LMH6655MA-TI meets industry standards.
7.What is the process for return or replacement of LMH6655MA-TI?
All LMH6655MA-TI units undergo pre-shipment inspection (PSI). If there is an issue with LMH6655MA-TI, 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 LMH6655MA-TI part is unused and in its original packaging.
Return procedure for LMH6655MA-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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