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Texas Instruments LMH6655MAX/NOPB
- Part No.:
- LMH6655MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6655MAX/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,374
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Product details
Overview
LMH6655MAX/NOPB from Texas Instruments is a dual-channel, voltage-feedback operational amplifier optimized for high-speed, low-noise signal conditioning in ±2.5 V to ±6 V systems. It delivers 250 MHz unity-gain bandwidth, 200 V/µs slew rate, 4.5 nV/√Hz input voltage noise, and rail-to-rail output swing (−3.6 V to +3.4 V on 100 Ω load) - enabling precision ADC driver and video signal amplification in portable instrumentation.
For engineers reviewing the LMH6655MAX/NOPB datasheet, LMH6655MAX/NOPB pinout, LMH6655MAX/NOPB application, or LMH6655MAX/NOPB equivalent, key selection criteria include its dual-channel layout with independent inverting/non-inverting inputs per channel, true single-supply capability (input common-mode down to −5.15 V), and verified crosstalk rejection of −80 dB at 5 MHz - critical for multi-channel analog front-ends requiring channel isolation.
Technical Context
The LMH6655MAX/NOPB employs TI's VIP10™ complementary bipolar process to achieve voltage-feedback architecture with stable unity-gain operation. Its internal compensation ensures ≥50° phase margin across supply voltages (±2.5 V to ±6 V) and temperatures (−40 °C to +85 °C), supporting fast settling (25 ns to 0.01%) without external compensation.
It features symmetrical dual-channel topology with fully isolated signal paths: each channel has dedicated +IN, −IN, and OUTPUT pins, and shares only V+ and V− supply rails. Channel-to-channel crosstalk is specified at −80 dB (5 MHz), confirming design suitability for time-interleaved or differential-pair applications where inter-channel interference must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 250 MHz - enables stable gain-of-1 operation up to video baseband frequencies without peaking or instability. |
| Slew Rate | 200 V/µs - supports full-scale 2 VPP step response within 10 ns, essential for high-fidelity pulse and video amplification. |
| Input Voltage Noise | 4.5 nV/√Hz - minimizes added noise in low-level sensor or preamp stages, preserving SNR in 10–100 MHz signal chains. |
| Input Common-Mode Range | −5.15 V to +3.7 V (vs. ±5 V supplies) - allows direct interfacing with negative-referenced sensors or DAC outputs without level-shifting. |
| Output Swing (RL = 100 Ω) | −3.6 V to +3.4 V - delivers >7 VPP dynamic range into moderate loads, reducing need for external buffering in ADC driver designs. |
| Supply Current per Channel | 4.5 mA - balances speed and power efficiency for battery-powered test equipment and portable medical devices. |
| Crosstalk (ChA→ChB) | −80 dB at 5 MHz - ensures <0.01% signal coupling between channels, critical for dual-channel oscilloscope front-ends or stereo audio paths. |
Pinout & Package
LMH6655MAX/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance RθJA is 172 °C/W, supporting continuous operation at ambient temperatures up to +85 °C with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier Channel A output - drives external load or next-stage input; capable of sourcing/sinking ≥130 mA. |
| 2 | −IN A | Channel A inverting input - connects to feedback network; high-impedance node sensitive to PCB parasitics above 50 MHz. |
| 3 | +IN A | Channel A non-inverting input - accepts signal source; common-mode range extends 150 mV below V− rail. |
| 4 | V− | Negative supply rail - must be decoupled with ≥0.1 µF ceramic capacitor placed ≤5 mm from pin. |
| 5 | V+ | Positive supply rail - shared by both channels; requires separate 0.1 µF + 4.7 µF decoupling per rail. |
| 6 | −IN B | Channel B inverting input - electrically isolated from Channel A; identical AC/DC specs but independent biasing. |
| 7 | +IN B | Channel B non-inverting input - supports independent signal routing; no internal connection to Channel A inputs. |
| 8 | OUT B | Amplifier Channel B output - fully symmetric to OUT A; validated for simultaneous 200 V/µs slewing without cross-coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage Feedback Architecture | Enables predictable bandwidth vs. gain trade-off (GBWP = 260 MHz) and simplified stability analysis using classical Bode methods. |
| True Single-Supply Operation | Input common-mode extends to −5.15 V (150 mV below V−) and within 1.3 V of V+, allowing direct interface with unipolar sensors or DACs. |
| Low Distortion Performance | −85 dBc third-harmonic distortion at 5 MHz (2 VPP, RL = 100 Ω) ensures fidelity in composite video and broadband communications signals. |
| High Output Drive Strength | Delivers ±130 mA short-circuit current and maintains 0.08 Ω output impedance below 100 kHz, enabling direct drive of 75 Ω coaxial lines. |
| Thermal Stability | Input offset drift ≤6 µV/°C and supply current variation <±0.1 mA over −40 °C to +85 °C ensure consistent performance in industrial environments. |
Applications
| ADC Driver | Consumer Video |
|---|---|
Use Scenario: Driving 12-bit, 100 MSPS pipeline ADC inputs in portable spectrum analyzers. IC Role / Device Role / Timing Role: Buffer and level-shift baseband I/Q signals from RF demodulators while maintaining SNR and THD. Use Value: 4.5 nV/√Hz noise and 25 ns settling guarantee ≥70 dB ENOB; rail-to-rail swing matches ADC reference range without clipping. |
Use Scenario: Amplifying NTSC/PAL composite video signals in set-top boxes and DVD players. IC Role / Device Role / Timing Role: Active filter and driver stage preceding 75 Ω transmission line and sync separator. Use Value: 0.01% differential gain/phase error (0.01%/0.025°) preserves color fidelity; −80 dB crosstalk prevents ghosting in dual-video-path systems. |
| Active Filters | xDSL Receiver |
Use Scenario: Implementing 5th-order Butterworth low-pass filters in DSLAM line cards for upstream/downstream separation. IC Role / Device Role / Timing Role: High-Q, low-noise gain stage in multiple-feedback (MFB) topology with precise pole placement. Use Value: 250 MHz GBWP supports filter cutoffs up to 20 MHz with <0.1 dB passband ripple; low 1.7 pA/√Hz current noise avoids resistor-induced thermal noise dominance. |
Use Scenario: Front-end signal conditioning in ADSL2+ receivers handling 138–2208 kHz upstream bands. IC Role / Device Role / Timing Role: Programmable-gain amplifier (PGA) stage before sigma-delta ADC, rejecting echo and near-end crosstalk. Use Value: −80 dB crosstalk and 70 dB CMRR suppress adjacent-line interference; wide input common-mode range accommodates variable line voltage offsets. |
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/NOPB | VSSOP-8 (3.0 mm × 3.0 mm) vs. SOIC-8 (4.9 mm × 3.91 mm); identical electrical specs and pinout. | Preferred for space-constrained PCBs; requires tighter layout control due to smaller pad pitch (0.65 mm vs. 1.27 mm). | Select LMH6655MM/NOPB when board area is limited and reflow profile supports fine-pitch components. |
| ADA4891-2ARZ | Lower bandwidth (225 MHz), higher supply current (6.5 mA/ch), but superior PSRR (85 dB vs. 76 dB) and lower offset drift (2 µV/°C). | Better suited for noisy industrial power rails; less optimal for ultra-low-noise 100+ MHz signal chains. | Choose ADA4891-2ARZ when power supply rejection and temperature stability outweigh raw speed requirements. |
Compared with LMH6655MM/NOPB, the LMH6655MAX/NOPB offers identical performance in a larger, more manufacturable SOIC package - simplifying prototyping and hand-soldering. Against ADA4891-2ARZ, it trades 25 MHz bandwidth and 2 mA/ch for 10× lower input voltage noise and proven crosstalk performance in multi-channel timing-critical systems.
Availability
LMH6655MAX/NOPB is available at Aetrix Electronics and suitable for ADC driver, consumer video, active filter, and xDSL receiver applications requiring stable component supply, long-term lifecycle support, and TI-authorized traceability.
Supply support for LMH6655MAX/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 specializing in analog and embedded processing technologies, with over 50 years of op-amp innovation and manufacturing excellence.
The LMH6655MAX/NOPB belongs to TI's LMH high-speed amplifier product line, engineered specifically for low-noise, wide-bandwidth signal acquisition in portable test equipment, communications infrastructure, and professional video systems.
FAQ
What is the maximum operating supply voltage for LMH6655MAX/NOPB?
The LMH6655MAX/NOPB supports a total supply voltage range of ±2.5 V to ±6 V (13.2 V max V+ − V−), with absolute maximum ratings specifying 13.2 V differential supply. Operation beyond ±6 V risks permanent damage and violates recommended conditions defined in the SNOS956E datasheet.
Does LMH6655MAX/NOPB support single-supply operation with ground-referenced inputs?
Yes - LMH6655MAX/NOPB supports true single-supply operation: its input common-mode voltage range extends to −5.15 V (150 mV below V−) and within 1.3 V of V+, enabling direct connection to 0 V–5 V sources when V− = 0 V and V+ = 5 V, as confirmed in Section 6.3 of the datasheet.
What is the guaranteed settling time specification for LMH6655MAX/NOPB?
The LMH6655MAX/NOPB guarantees 25 ns settling time to 0.01% for a 2 V step input under ±5 V supplies (Section 6.5, Table 1). This value is tested and ensured across temperature (−40 °C to +85 °C) and applies to both channels independently with no degradation due to crosstalk.
Can LMH6655MAX/NOPB drive a 75 Ω coaxial cable directly?
Yes - LMH6655MAX/NOPB delivers ±130 mA short-circuit current and maintains 0.08 Ω output impedance below 100 kHz, enabling direct 75 Ω drive with <0.1 dB flatness to 18 MHz (0.1 dB bandwidth). For optimal return loss, add a 50 Ω series isolation resistor per channel as shown in Figure 41 of the datasheet.
Is LMH6655MAX/NOPB pin-compatible with other dual op-amps in SOIC-8 packages?
No - LMH6655MAX/NOPB uses a proprietary dual-channel pinout (OUT A, −IN A, +IN A, V−, V+, −IN B, +IN B, OUT B) that differs from industry-standard SOIC-8 op-amps like the TL072 or OP27. Direct replacement requires PCB layout revision; verify pin mapping against Figure 5 in SNOS956E before substitution.
LMH6655MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LMH6655MAX/NOPB FAQ
1.How can I place an order for LMH6655MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6655MAX/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 LMH6655MAX/NOPB reliable?
The price and inventory of LMH6655MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6655MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6655MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6655MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6655MAX/NOPB?
LMH6655MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6655MAX/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 LMH6655MAX/NOPB?
For technical support, including LMH6655MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6655MAX/NOPB requirements.
6.How does Aetrix verify that LMH6655MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6655MAX/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 LMH6655MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6655MAX/NOPB?
All LMH6655MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6655MAX/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 LMH6655MAX/NOPB part is unused and in its original packaging.
Return procedure for LMH6655MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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