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Texas Instruments LMH6655MA
- Part No.:
- LMH6655MA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6655MA.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,215
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Product details
Overview
LMH6655MA 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 into 100 Ω) - enabling precision ADC driving and video signal amplification in portable instrumentation.
For engineers reviewing the LMH6655MA datasheet, LMH6655MA pinout, LMH6655MA application, or LMH6655MA equivalent, key selection criteria include its dual-channel layout, VSSOP-8 (DGK) package compatibility, low-power 4.5 mA/channel operation, and verified performance in consumer video and xDSL receiver front-ends under ±5 V supply conditions.
Technical Context
The LMH6655MA implements a voltage-feedback architecture with unity-gain stability across its full 250 MHz bandwidth, supported by TI's VIP10™ complementary bipolar process. Its input common-mode range extends 150 mV below V− and within 1.3 V of V+, enabling true single-supply operation at 5 V while maintaining >70 dB CMRR and >60 dB PSRR up to 10 MHz.
Each channel features matched dynamic performance: 25 ns settling time to 0.01%, <1.4 ns rise/fall times, and −80 dBc second-harmonic distortion at 5 MHz (2 VPP output). Channel-to-channel crosstalk is −80 dB at 5 MHz, confirming isolation integrity for dual-path analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 250 MHz - supports stable gain-of-1 operation for wideband buffer and line-driver applications without external compensation. |
| Slew Rate | 200 V/µs - enables faithful reproduction of fast transient signals (e.g., video sync pulses, ADC sampling edges) without slew-induced distortion. |
| Input Voltage Noise | 4.5 nV/√Hz - minimizes added noise in low-level sensor and pre-amplifier stages where signal integrity is critical. |
| Supply Current per Channel | 4.5 mA - allows dual-channel high-speed amplification in power-constrained portable designs without thermal derating. |
| Output Swing (RL = 100 Ω) | −3.6 V to +3.4 V (±5 V supply) - delivers >7 VPP dynamic range into moderate loads, preserving SNR in ADC driver configurations. |
| Settling Time (0.01%) | 25 ns - meets timing requirements for 10+ MS/s data acquisition systems where aperture uncertainty must be minimized. |
| Input Common-Mode Range | −5.15 V to +3.7 V (±5 V supply) - supports ground-referenced inputs and level-shifting in mixed-signal interfaces. |
Pinout & Package
LMH6655MA is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, optimized for high-density PCB layouts and thermal performance (RθJA = 235 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Channel A output - drives external load or next-stage input; capable of sourcing/sinking ≥130 mA short-circuit current. |
| 2 | −IN A | Channel A inverting input - connects to feedback network; requires impedance matching to minimize noise and offset errors. |
| 3 | +IN A | Channel A non-inverting input - accepts differential or single-ended signal source; bias current cancellation recommended via Rseq. |
| 4 | V− | Negative supply rail - must be decoupled with low-ESR capacitor ≤1 cm from pin; shared between both channels. |
| 5 | −IN B | Channel B inverting input - electrically isolated from Channel A; crosstalk rejection ≥80 dB at 5 MHz confirmed. |
| 6 | +IN B | Channel B non-inverting input - independent signal path; identical DC and AC specs to Channel A. |
| 7 | OUT B | Channel B output - fully symmetrical to OUT A; supports independent gain configuration per channel. |
| 8 | V+ | Positive supply rail - supplies both channels; PSRR >60 dB ensures immunity to supply ripple up to 10 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback architecture | Enables predictable closed-loop bandwidth control and stable unity-gain operation without external compensation components. |
| Rail-to-rail output swing | Delivers ±3.4 V into 100 Ω at ±5 V supply, maximizing dynamic range for 12–14-bit ADC drivers without external level-shifting. |
| Low input voltage noise (4.5 nV/√Hz) | Reduces integrated noise floor in high-gain preamp stages, critical for medical sensors and precision instrumentation front-ends. |
| True single-supply capability | Input common-mode range includes ground (−5.15 V to +3.7 V), allowing direct interfacing with 0–3.3 V microcontroller I/O or SAR ADC references. |
| Dual-channel isolation | −80 dB crosstalk at 5 MHz ensures independent signal paths for stereo audio, dual ADC channels, or differential pair amplification. |
Applications
| ADC Driver | Consumer Video |
|---|---|
Use Scenario: Driving the input of a 10–14-bit, 10+ MS/s successive-approximation ADC in a portable data logger. IC Role / Device Role / Timing Role: High-fidelity buffer and level shifter that settles within 25 ns to 0.01% and maintains >70 dB SFDR over 5 MHz bandwidth. Use Value: Eliminates external passive filtering and reduces aperture jitter, directly improving effective number of bits (ENOB) by ≥0.5 bits. |
Use Scenario: Amplifying composite NTSC video signals in set-top boxes or HDMI-to-analog converters. IC Role / Device Role / Timing Role: Dual-channel video driver delivering 0.01% differential gain (0.01%) and phase (0.025°) error at 4.43 MHz. Use Value: Preserves color fidelity and luma/chroma separation without requiring post-compensation circuitry. |
| Active Filter | xDSL Receiver |
Use Scenario: Implementing 4th-order Butterworth low-pass filters in broadband test equipment front-ends. IC Role / Device Role / Timing Role: Dual op-amp core for cascaded Sallen-Key stages operating up to 50 MHz closed-loop bandwidth (G = +5). Use Value: Maintains filter Q-factor and cutoff accuracy across temperature (−40°C to +85°C) due to matched channel characteristics. |
Use Scenario: Receiving and conditioning upstream/downstream analog signals in ADSL2+ line cards. IC Role / Device Role / Timing Role: Dual-channel line receiver with >230 MHz closed-loop bandwidth (G = +1, 5 V supply) and −78 dB crosstalk. Use Value: Supports simultaneous upstream/downstream channel processing on a single DGK-package IC, reducing board area by 35% vs. discrete solutions. |
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 | Same silicon die, SOIC-8 package (4.90 mm × 3.91 mm); higher RθJA (172 °C/W) and larger footprint. | Preferred for prototyping or legacy PCBs with SOIC footprints; less suitable for space-constrained portable designs. | Select LMH6655MM only when SOIC-8 mechanical compatibility or thermal mass is required over VSSOP-8 density. |
| THS3202D | Higher supply current (12 mA/channel), wider bandwidth (1.8 GHz), but 8.5 nV/√Hz input noise and no VSSOP option. | Better for RF IF amplification above 100 MHz; unsuitable for low-noise, battery-powered applications. | Choose THS3202D only when bandwidth >1 GHz is mandatory and system noise budget permits >8 nV/√Hz. |
Compared with LMH6655MM and THS3202D, the LMH6655MA uniquely balances 250 MHz bandwidth, 4.5 nV/√Hz noise, 4.5 mA/channel power, and 3×3 mm VSSOP packaging - making it optimal for space- and power-sensitive dual-channel analog signal chains where noise and settling performance are co-critical.
Availability
LMH6655MA is available at Aetrix Electronics and suitable for ADC driver, consumer video, active filter, and xDSL receiver applications requiring stable component supply, consistent parametric performance across temperature, and long-term industrial lifecycle support.
Supply support for LMH6655MA 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 LMH6655MA belongs to TI's LMH66xx family of low-noise, high-speed voltage-feedback amplifiers, designed specifically for portable instrumentation, communications infrastructure, and precision data acquisition where bandwidth, noise, and power efficiency intersect.
FAQ
What is the maximum supply voltage range for the LMH6655MA?
The LMH6655MA operates across a total supply voltage range of ±2.5 V to ±6 V (5 V to 12 V total), with absolute maximum ratings specifying V+ − V− ≤ 13.2 V. Operation at ±6 V is validated per datasheet electrical characteristics, and thermal limits remain within specification up to 85°C ambient when using the VSSOP-8 package's 235 °C/W junction-to-ambient resistance.
Does the LMH6655MA support single-supply operation?
Yes, the LMH6655MA supports true single-supply operation: its input common-mode voltage range extends from −5.15 V to +3.7 V (at ±5 V supply), meaning it accepts inputs down to 150 mV below V− and up to 1.3 V below V+. When powered from a single 5 V rail (V− = 0 V, V+ = 5 V), the input range is −0.15 V to +3.7 V, enabling ground-referenced signal handling without level shifting.
What is the guaranteed settling time specification for the LMH6655MA?
The LMH6655MA guarantees 25 ns settling time to 0.01% for a 2 V step input under ±5 V supply conditions (AV = +1, RL = 100 Ω), as specified in the ±5 V Electrical Characteristics table. This value is tested and ensured across the full operating temperature range (−40°C to +85°C) and applies identically to both channels.
How does the LMH6655MA compare to the LMH6654 in terms of pin compatibility?
The LMH6655MA (dual, VSSOP-8) is not pin-compatible with the LMH6654 (single, SOT-23-5 or SOIC-8). Their pinouts differ fundamentally: LMH6655MA uses pins 1/7 for OUT A/B and 2/5 for −IN A/B, while LMH6654 dedicates all 5 or 8 pins to one channel. No shared footprint exists - migration requires PCB redesign and layout verification for signal integrity and thermal management.
Is the LMH6655MA suitable for driving capacitive loads?
Yes, but with design mitigation: the LMH6655MA's output impedance becomes inductive at high frequencies, risking instability with >100 pF capacitive loads. TI recommends adding a 50 Ω isolation resistor (RISO) in series with the output, as shown in Figure 41 of the datasheet. This preserves phase margin and limits peaking to ≤3 dB in unity-gain configurations, verified across 1–100 pF load ranges.
LMH6655MA 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:
- 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 FAQ
1.How can I place an order for LMH6655MA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6655MA 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 reliable?
The price and inventory of LMH6655MA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6655MA is usually 5 days.
3.What payment methods are accepted for LMH6655MA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6655MA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6655MA?
LMH6655MA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6655MA 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?
For technical support, including LMH6655MA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6655MA requirements.
6.How does Aetrix verify that LMH6655MA is sourced from the original manufacturer or authorized distributors?
All LMH6655MA 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 meets industry standards.
7.What is the process for return or replacement of LMH6655MA?
All LMH6655MA units undergo pre-shipment inspection (PSI). If there is an issue with LMH6655MA, 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 part is unused and in its original packaging.
Return procedure for LMH6655MA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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