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Texas Instruments LMH6655MA/NOPB
- Part No.:
- LMH6655MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6655MA/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,419
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Product details
Overview
LMH6655MA/NOPB from Texas Instruments is a dual-channel, voltage-feedback operational amplifier optimized for high-speed, low-noise signal conditioning. It delivers 250 MHz unity-gain bandwidth, 4.5 nV/√Hz input voltage noise, and ±3.6 V output swing into 100 Ω at ±5 V supply - enabling precision ADC driving and video signal amplification in portable instrumentation and communications receivers.
For engineers reviewing the LMH6655MA/NOPB datasheet, LMH6655MA/NOPB pinout, LMH6655MA/NOPB application, or LMH6655MA/NOPB equivalent, key selection criteria include its dual-channel layout with independent inputs/outputs, rail-to-rail input common-mode range (−5.15 V to +3.7 V), 200 V/µs slew rate, and compatibility with single-supply (5 V) and split-supply (±2.5 V to ±6 V) operation.
Technical Context
The LMH6655MA/NOPB employs TI's VIP10™ complementary bipolar process to achieve unity-gain stability with 250 MHz bandwidth while consuming only 4.5 mA per channel. Its voltage-feedback architecture supports fast settling (25 ns to 0.01%) and low distortion (−85 dBc third harmonic at 5 MHz), making it suitable for wideband closed-loop configurations up to gain +10.
Input stage design enables true single-supply operation: input common-mode voltage extends 150 mV below negative rail and within 1.3 V of positive rail; output swing reaches −3.6 V to +3.4 V into 100 Ω under ±5 V supply. Channel-to-channel crosstalk is −80 dB at 5 MHz, confirming isolation integrity in dual-signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 250 MHz - supports stable closed-loop operation at G = +1 with minimal phase margin degradation |
| Slew Rate | 200 V/µs - enables faithful reproduction of fast transient signals without slew-induced distortion |
| Input Voltage Noise | 4.5 nV/√Hz - critical for preserving SNR in low-amplitude sensor and pre-amp stages |
| Supply Current/Ch | 4.5 mA - allows dual-channel high-speed amplification within tight power budgets (e.g., battery-powered xDSL receivers) |
| Output Swing (RL = 100 Ω) | −3.6 V to +3.4 V - delivers >7 VPP dynamic range into moderate loads, easing interface with 12-bit+ ADCs |
| Settling Time (0.01%) | 25 ns - ensures accurate sampling of multi-MHz waveforms in data acquisition systems |
| Input CMVR | −5.15 V to +3.7 V - supports direct coupling from bipolar sensors or AC-coupled video sources without level-shifting |
Pinout & Package
LMH6655MA/NOPB is packaged in an 8-pin SOIC (D package) with body size 4.90 mm × 3.91 mm, rated for industrial temperature range (−40 °C to +85 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Channel A output | Provides buffered, high-slew-rate output for first signal path; drives 100 Ω loads to ±3.4 V |
| −IN A (Pin 2) | Channel A inverting input | Differential input node for inverting amplifier configurations; matched impedance critical for noise performance |
| +IN A (Pin 3) | Channel A non-inverting input | High-impedance input accepting signals down to −5.15 V; bias current 5–18 µA affects DC accuracy |
| V− (Pin 4) | Negative supply rail | Reference for internal circuitry; supports operation down to −2.5 V (single-supply mode uses ground) |
| V+ (Pin 5) | Positive supply rail | Accepts up to +6 V; PSRR >60 dB minimizes supply ripple coupling into output |
| −IN B (Pin 6) | Channel B inverting input | Independent second channel input; crosstalk −80 dB ensures isolation in dual-path designs |
| +IN B (Pin 5) | Channel B non-inverting input | Matches +IN A characteristics; enables synchronous dual-channel signal processing |
| OUT B (Pin 7) | Channel B output | Electrically identical to OUT A; supports parallel or interleaved signal chains without interaction |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback architecture | Enables predictable compensation and stable unity-gain operation without external components |
| Rail-to-rail input common-mode range | Supports direct connection to transducers operating near supply rails, eliminating level-shift circuitry |
| Low 1.7 pA/√Hz input current noise | Maintains signal fidelity when driving high-impedance sources (e.g., photodiode transimpedance stages) |
| 25 ns 0.01% settling time | Meets timing requirements for 20+ MSPS data converters without added latency or droop |
| Channel-to-channel crosstalk ≤−80 dB | Preserves signal independence in dual ADC driver or stereo video applications |
Applications
| ADC Driver | Consumer Video |
|---|---|
Use Scenario: Driving the analog input of a 12-bit, 20 MSPS pipeline ADC in a portable spectrum analyzer. IC Role / Device Role / Timing Role: Dual-channel buffer and gain stage ensuring full-scale signal delivery with <25 ns settling and minimal harmonic distortion. Use Value: 4.5 nV/√Hz noise and −85 dBc THD preserve ENOB; 200 V/µs slew rate prevents step-response overshoot during fast transitions. | Use Scenario: Amplifying composite NTSC video signals in a set-top box front-end before digitization. IC Role / Device Role / Timing Role: Dual-channel video line driver providing differential gain, DC restoration, and drive capability for 75 Ω coaxial cables. Use Value: 0.01% / 0.025° DG/DP specs meet broadcast video fidelity standards; −80 dB crosstalk prevents inter-channel interference. |
| Active Filter | xDSL Receiver |
Use Scenario: Implementing a 5th-order Butterworth anti-aliasing filter preceding a DSL line card ADC. IC Role / Device Role / Timing Role: Dual op-amp core for cascaded biquad sections, configured as unity-gain followers and inverting integrators. Use Value: 250 MHz GBW supports filter corner frequencies up to 20 MHz with flat group delay; low noise avoids degrading SNR in baseband channels. | Use Scenario: Receiving and conditioning upstream/downstream analog signals in ADSL2+ CPE equipment. IC Role / Device Role / Timing Role: Dual-channel line receiver amplifying differential DSL signals while rejecting common-mode noise on twisted-pair lines. Use Value: High PSRR (>60 dB) suppresses power supply noise; wide input CMVR accommodates varying line voltages without clipping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6655MM/NOPB | VSSOP-8 package (3.0 mm × 3.0 mm); identical electrical specs and pinout | Preferred for space-constrained PCBs; thermal resistance RθJA = 235 °C/W vs. 172 °C/W for SOIC | Select LMH6655MM/NOPB when board area is limited and thermal management permits higher junction rise. |
| ADA4897-2 | Lower supply current (2.1 mA/ch), lower noise (1.0 nV/√Hz), but narrower bandwidth (225 MHz) | Better for ultra-low-power, low-noise pre-amps; less suitable for >200 MHz closed-loop gain ≥+2 | Choose ADA4897-2 when power efficiency and sub-2 nV/√Hz noise outweigh need for >230 MHz bandwidth. |
Compared with LMH6655MA/NOPB, LMH6655MM/NOPB offers identical performance in a smaller footprint but requires careful thermal design, while ADA4897-2 trades bandwidth for significantly lower noise and current - making it optimal for precision, low-power front-ends rather than wideband video or ADC driving.
Availability
LMH6655MA/NOPB is available at Aetrix Electronics and suitable for ADC driver, consumer video, active filter, and xDSL receiver applications requiring stable component supply, guaranteed long-term sourcing, and full traceability.
Supply support for LMH6655MA/NOPB 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 across industrial, automotive, and communications markets.
The LMH6655MA/NOPB belongs to TI's high-speed voltage-feedback op-amp product line, engineered for applications demanding wide bandwidth, low noise, and robust output drive in portable and infrastructure equipment.
FAQ
What supply voltage ranges does the LMH6655MA/NOPB support?
The LMH6655MA/NOPB operates from ±2.5 V to ±6 V in split-supply mode or from +2.5 V to +12 V in single-supply configuration. At ±5 V, it delivers 250 MHz bandwidth and 200 V/µs slew rate; at +5 V, bandwidth reduces to 230 MHz with 190 V/µs slew rate. The device maintains specified performance across −40 °C to +85 °C ambient temperature.
Does the LMH6655MA/NOPB require external compensation for unity-gain stability?
No, the LMH6655MA/NOPB is internally compensated for unity-gain stable operation. Its voltage-feedback architecture and 250 MHz bandwidth are fully characterized at AV = +1 with 25 Ω feedback resistor, achieving 50° phase margin and 25 ns 0.01% settling time. No external capacitors or resistors are needed to ensure stability in standard gain configurations.
How does the LMH6655MA/NOPB handle capacitive loads?
The LMH6655MA/NOPB exhibits reduced phase margin with capacitive loads >100 pF, potentially causing ringing or oscillation. TI recommends inserting a 50 Ω isolation resistor between output and load (as shown in Figure 41 of SNOS956E). This resistor damps resonance by isolating the op-amp's inductive output impedance from the load capacitance, maintaining clean pulse response up to 500 pF.
What is the input common-mode voltage range for the LMH6655MA/NOPB at ±5 V supply?
At ±5 V supply, the LMH6655MA/NOPB supports an input common-mode voltage range of −5.15 V to +3.7 V, extending 150 mV below the negative rail and within 1.3 V of the positive rail. This rail-to-rail input capability enables direct interfacing with bipolar sensors, AC-coupled video sources, and other signals that swing near supply extremes without external level-shifting circuitry.
Is the LMH6655MA/NOPB pin-compatible with other dual op-amps in SOIC-8 packages?
The LMH6655MA/NOPB follows standard SOIC-8 pinout for dual op-amps (OUT A, −IN A, +IN A, V−, V+, −IN B, +IN B, OUT B), matching industry conventions. However, it is not functionally or electrically pin-compatible with general-purpose op-amps like LM358 or TL072 due to differences in bandwidth, supply range, and output drive. Always verify biasing, decoupling, and feedback network compatibility before substitution.
LMH6655MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 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
LMH6655MA/NOPB FAQ
1.How can I place an order for LMH6655MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6655MA/NOPB 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/NOPB reliable?
The price and inventory of LMH6655MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6655MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6655MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6655MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6655MA/NOPB?
LMH6655MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6655MA/NOPB 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/NOPB?
For technical support, including LMH6655MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6655MA/NOPB requirements.
6.How does Aetrix verify that LMH6655MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6655MA/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6655MA/NOPB?
All LMH6655MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6655MA/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LMH6655MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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