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Texas Instruments LMH6655MMX
- Part No.:
- LMH6655MMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6655MMX.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,113
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Product details
Overview
LMH6655MMX from Texas Instruments is a dual-channel, voltage-feedback operational amplifier designed for high-speed signal conditioning in portable and precision analog systems. 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 high-fidelity ADC driver and video signal amplification roles.
For engineers reviewing the LMH6655MMX datasheet, LMH6655MMX pinout, LMH6655MMX application, or LMH6655MMX equivalent, key selection criteria include its dual-channel layout in VSSOP-8 package, rail-to-rail input capability (−5.15 V to +3.7 V), 200 V/µs slew rate, and verified crosstalk rejection of −80 dB at 5 MHz - all critical for multi-channel timing integrity and low-noise front-end design.
Technical Context
The LMH6655MMX 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 wide common-mode input range extending 150 mV below negative rail.
Designed for dual-channel isolation, it features channel-to-channel crosstalk of −80 dB at 5 MHz and differential gain/phase errors of 0.01% and 0.025° in NTSC video applications - confirming suitability for synchronous multi-signal paths where inter-channel interference must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 250 MHz - enables stable operation at G = +1 with minimal phase margin degradation in high-frequency closed-loop designs. |
| Slew Rate | 200 V/µs - supports clean amplification of fast transient signals (e.g., video pulses, ADC sampling edges) without slew-induced distortion. |
| Input Voltage Noise | 4.5 nV/√Hz - ensures minimal added noise in low-level signal chains such as sensor pre-amplifiers or medical front-ends. |
| Supply Current/Ch | 4.5 mA - allows dual-channel high-speed amplification within tight power budgets typical of battery-powered instrumentation. |
| Output Swing (RL = 100 Ω) | −3.6 V to +3.4 V - delivers >7 VPP dynamic range into moderate loads, supporting full-scale signal transmission to downstream ADCs or video DACs. |
| Crosstalk (5 MHz) | −80 dB - guarantees <0.01% signal coupling between channels, essential for independent processing in dual ADC drivers or stereo audio paths. |
| Input CMVR | −5.15 V to +3.7 V - permits direct interfacing with single-supply sensors or bipolar signal sources without level-shifting circuitry. |
Pinout & Package
The LMH6655MMX is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, optimized for space-constrained PCB layouts while maintaining thermal performance via exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Channel A output - drives external load; requires local decoupling and controlled-impedance trace routing for signal integrity above 50 MHz. |
| 2 | −IN A | Channel A inverting input - forms feedback node; sensitive to parasitic capacitance; must be routed short and away from noisy traces. |
| 3 | +IN A | Channel A non-inverting input - accepts high-impedance source signals; bias current cancellation requires matched Rseq on this pin. |
| 4 | V− | Negative supply - shared return path for both channels; requires low-inductance connection to ground plane or dedicated supply rail. |
| 5 | −IN B | Channel B inverting input - electrically isolated from Channel A; crosstalk specification validated at this pin under 5 MHz stimulus. |
| 6 | +IN B | Channel B non-inverting input - identical electrical behavior to Pin 3; enables independent dual-channel configuration without interaction. |
| 7 | OUT B | Channel B output - fully independent output stage; supports simultaneous high-speed signaling with Channel A under same thermal conditions. |
| 8 | V+ | Positive supply - powers both amplifiers; requires ≥1 µF ceramic bypass capacitor placed ≤2 mm from pin to suppress supply-induced noise. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 150 mV below V− and within 1.3 V of V+, enabling direct interface with single-ended sensors and DAC outputs without level shifters. |
| Low-noise voltage feedback topology | 4.5 nV/√Hz voltage noise + 1.7 pA/√Hz current noise optimizes SNR in wideband transimpedance and pre-amplifier configurations. |
| Dual-channel isolation | −80 dB crosstalk at 5 MHz ensures independent signal paths for stereo audio, dual ADC inputs, or differential pair buffering without mutual interference. |
| Fast settling time | 25 ns to 0.01% supports high-throughput data acquisition systems requiring sub-40 MSPS sampling with minimal aperture uncertainty. |
| Single-supply compatible operation | Functions from 5 V (V+ = 5 V, V− = 0 V) with input CMVR from −0.15 V to +3.7 V - simplifies integration into mixed-signal SoC platforms. |
Applications
| ADC Driver | Consumer Video |
|---|---|
Use Scenario: Driving SAR or pipeline ADC inputs with fast-switching, full-scale analog signals in portable test equipment. IC Role / Device Role / Timing Role: Buffer and level-shift analog input prior to sampling; provides low-output-impedance drive to minimize charge kickback and aperture jitter. Use Value: 250 MHz bandwidth and 200 V/µs slew rate ensure faithful reproduction of fast input transients, while 4.5 nV/√Hz noise preserves ENOB in 12–14-bit conversion. | Use Scenario: Amplifying composite NTSC video signals in set-top boxes or HDMI receiver front-ends before digitization. IC Role / Device Role / Timing Role: Dual-channel video buffer with precise gain matching and minimal differential phase/gain error across luminance/chrominance paths. Use Value: Verified 0.01% DG and 0.025° DP error at AV = +2 meets ITU-R BT.470 standards; −80 dB crosstalk prevents color bleeding between channels. |
| Active Filter | Pulse Delay Circuit |
Use Scenario: Implementing 4th-order Butterworth low-pass filtering in ultrasound receive beamformers with minimal group delay variation. IC Role / Device Role / Timing Role: High-speed op-amp in multiple feedback (MFB) or state-variable filter topologies requiring wide GBWP and low distortion. Use Value: 260 MHz gain-bandwidth product supports high-Q filter stages up to 20 MHz; −85 dB third-harmonic distortion avoids spurious content in baseband reconstruction. | Use Scenario: Generating precisely timed, low-jitter delay lines for time-of-flight measurement in industrial LIDAR modules. IC Role / Device Role / Timing Role: Fast comparator replacement or pulse shaper in analog delay networks where propagation delay consistency matters more than DC accuracy. Use Value: 25 ns 0.01% settling time ensures sub-nanosecond timing resolution; 200 V/µs slew rate maintains edge fidelity across variable delay settings. |
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 |
|---|---|---|---|
| LMH6655MAX | Same silicon die, SOIC-8 package (4.90 mm × 3.91 mm); higher RθJA (172°C/W vs. 235°C/W) limits power dissipation in compact layouts. | Better suited for through-hole prototyping or legacy board compatibility; less optimal for thermally dense surface-mount assemblies. | Select LMH6655MAX when mechanical fit or hand-soldering requirements outweigh thermal density constraints. |
| THS3202DGN | Higher supply current (12 mA/ch), wider bandwidth (1.8 GHz), but 9 nV/√Hz noise - trades noise floor for raw speed. | Preferred for RF IF amplification or ultra-high-speed pulse generation where bandwidth >1 GHz is mandatory. | Choose THS3202DGN only when >1 GHz closed-loop bandwidth is required and system SNR budget allows doubling input noise. |
Compared with LMH6655MAX and THS3202DGN, the LMH6655MMX uniquely balances 250 MHz bandwidth, 4.5 nV/√Hz noise, and 4.5 mA/ch power in a 3 mm × 3 mm footprint - making it optimal for space- and noise-sensitive dual-channel applications where thermal headroom is limited.
Availability
LMH6655MMX is available at Aetrix Electronics and suitable for ADC driver, consumer video, active filter, and pulse delay circuits requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for LMH6655MMX 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-performance op-amps and signal chain solutions.
The LMH6655MMX belongs to TI's LMH66xx family of low-noise, high-speed voltage-feedback amplifiers - engineered specifically for portable instrumentation, video infrastructure, and precision data acquisition where bandwidth, noise, and power coexist as first-order constraints.
FAQ
What is the maximum operating supply voltage for the LMH6655MMX?
The LMH6655MMX 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; recommended use stays within ±2.5 V to ±6 V for guaranteed parametric performance across temperature.
Does the LMH6655MMX support single-supply operation?
Yes, the LMH6655MMX operates from a single 5 V supply (V+ = 5 V, V− = 0 V) with input common-mode voltage range from −0.15 V to +3.7 V and output swing from 1.1 V to 3.7 V (RL = 100 Ω). This enables direct interface with 3.3 V logic and unipolar sensors without level-shifting circuitry.
What is the thermal resistance (RθJA) of the LMH6655MMX in its VSSOP-8 package?
The LMH6655MMX in VSSOP-8 (DGK) package has a junction-to-ambient thermal resistance (RθJA) of 235°C/W, as specified in the Thermal Information table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with PCB copper area and thermal vias beneath the exposed pad.
How does crosstalk performance differ between the LMH6655MMX and LMH6655MAX?
Both LMH6655MMX and LMH6655MAX share identical silicon and specify −80 dB crosstalk at 5 MHz. The difference lies in package-induced parasitics: the smaller VSSOP-8 footprint of LMH6655MMX reduces inter-channel trace coupling, potentially yielding marginally better real-world isolation in high-density layouts versus the larger SOIC-8 LMH6655MAX.
Can the LMH6655MMX drive a 50 Ω load directly?
The LMH6655MMX is characterized into 100 Ω loads, delivering ±3.4 V swing. Driving 50 Ω directly exceeds its specified output current capability (±145 mA sourcing/sinking), risking distortion or thermal overload. For 50 Ω systems, use a series 50 Ω resistor at the output to match impedance while preserving linearity and thermal safety - as validated in TI's typical application circuits.
LMH6655MMX 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:
- 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-VSSOP
LMH6655MMX FAQ
1.How can I place an order for LMH6655MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6655MMX 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 LMH6655MMX reliable?
The price and inventory of LMH6655MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6655MMX is usually 5 days.
3.What payment methods are accepted for LMH6655MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6655MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6655MMX?
LMH6655MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6655MMX 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 LMH6655MMX?
For technical support, including LMH6655MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6655MMX requirements.
6.How does Aetrix verify that LMH6655MMX is sourced from the original manufacturer or authorized distributors?
All LMH6655MMX 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 LMH6655MMX meets industry standards.
7.What is the process for return or replacement of LMH6655MMX?
All LMH6655MMX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6655MMX, 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 LMH6655MMX part is unused and in its original packaging.
Return procedure for LMH6655MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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