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Texas Instruments LMH6553MR/NOPB
- Part No.:
- LMH6553MR/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6553MR/NOPB.pdf
- Description:
- IC OPAMP CFA 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:166
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Product details
Overview
LMH6553MR/NOPB from Texas Instruments is a 900 MHz fully differential amplifier with integrated adjustable output limiting clamp, designed as a high-fidelity ADC driver for 8–14-bit converters. It delivers −79 dB THD at 20 MHz, 600 ps clamp overdrive recovery time, and operates from ±2.5 V to ±6 V supplies. Its primary role is protecting downstream analog-to-digital converters from transient overvoltage during signal overload.
For engineers reviewing the LMH6553MR/NOPB datasheet, LMH6553MR/NOPB pinout, LMH6553MR/NOPB application, or LMH6553MR/NOPB equivalent, key selection criteria include differential output clamping accuracy (±40 mV), large-signal bandwidth (670 MHz @ AV = 1), settling time (10 ns to 0.1%), common-mode control bandwidth (220 MHz), and thermal performance in SO PowerPAD package (θJA = 59°C/W).
Technical Context
The LMH6553MR/NOPB implements a fully differential current-feedback architecture with separate internal paths for signal amplification and clamp control. Its output limiting function operates independently of the main gain path via dedicated VCLAMP pin, enabling fast 600 ps recovery without degrading small-signal linearity or phase response.
Common-mode feedback is implemented through the VCM pin, allowing precise DC-level setting of the differential output pair. The amplifier supports both AC- and DC-coupled inputs and configurable gain via external resistors, with stable operation across supply voltages from ±2.5 V to ±6 V and temperature range −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal BW | 900 MHz at AV = 1 - enables baseband-to-UHF signal conditioning without gain-dependent bandwidth collapse. |
| Large Signal BW | 670 MHz at AV = 1, 2 VPP - maintains fidelity for high-amplitude RF/IF waveforms driving ADC front ends. |
| THD @ 20 MHz | −79 dB - ensures minimal harmonic distortion in wideband communication and test equipment signal chains. |
| Clamp Recovery | 600 ps - recovers within one RF cycle at 1.6 GHz, preventing blanking or data loss in burst-mode systems. |
| Supply Range | ±2.5 V to ±6 V - supports low-voltage portable designs and higher-voltage industrial signal acquisition systems. |
| Input Noise | 1.2 nV/√Hz - preserves SNR when amplifying low-level sensor or RF mixer outputs. |
| Settling Time | 10 ns to 0.1% - meets timing budgets for high-speed sampling up to 100 MSPS with adequate guardband. |
Pinout & Package
The LMH6553MR/NOPB is packaged in an 8-pin SO PowerPAD (SOIC-8 with exposed thermal pad), optimized for thermal dissipation in high-power analog signal paths. The DAP (Die Attach Pad) must be soldered to a PCB thermal plane for reliable operation at full specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Negative input terminal | Differential input node; matched impedance and capacitance to +IN for balanced signal rejection. |
| 2: VCM | Output common-mode control | Sets DC level of differential outputs; drives internal CMFB loop to maintain precise VOUT_CM = VCM. |
| 3: V+ | Positive supply rail | Accepts +2.5 V to +6 V; requires local 0.1 µF bypass capacitor near pin. |
| 4: +OUT | Positive differential output | Delivers amplified, clamped signal; must be terminated differentially (e.g., 100 Ω across +OUT/−OUT). |
| 5: −OUT | Negative differential output | Complementary output; phase-inverted relative to +OUT; critical for maintaining amplitude/phase balance. |
| 6: V− | Negative supply rail | Accepts −2.5 V to −6 V; symmetric to V+ for true dual-supply operation. |
| 7: VCLAMP | Adjustable clamp voltage reference | Defines upper/lower output voltage limits; accuracy ±40 mV with −0.1 mV/°C drift ensures stable protection across temperature. |
| 8: +IN | Positive input terminal | Differential input node; internally matched to −IN for >80 dB CMRR and minimal input offset shift. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated output clamp | Eliminates need for external diode-based clamping networks, reducing board area and parasitic capacitance at ADC inputs. |
| Adjustable clamp threshold | VCLAMP pin accepts 0.42–3.0 V reference, enabling precise matching to ADC input voltage range (e.g., 0–2 V or ±1.25 V). |
| Fast overdrive recovery | 600 ps recovery ensures uninterrupted sampling in radar pulse detection, burst-mode comms, and oscilloscope front ends. |
| Dual-supply flexibility | Operates from ±2.5 V to ±6 V, supporting both low-power battery-operated instruments and high-dynamic-range industrial DAQ systems. |
| DC-coupled common-mode control | VCM pin allows direct-setting of output common-mode voltage, essential for interfacing with DC-coupled ADCs or downstream differential receivers. |
Applications
| High-Speed ADC Driver | RF/IF Signal Chain |
|---|---|
Use Scenario: Driving the analog inputs of a 14-bit, 105 MSPS pipeline ADC in a software-defined radio receiver. IC Role / Device Role / Timing Role: Differential signal conditioner and transient protector; provides gain, common-mode level shift, and output clamping before ADC sampling. Use Value: Prevents ADC saturation from strong interferers while preserving SFDR > 85 dBc up to 75 MHz due to −92 dB IMD3 performance. | Use Scenario: Buffering and level-shifting the output of a 200 MHz SAW filter in a cellular base station IF stage. IC Role / Device Role / Timing Role: High-linearity differential buffer with adjustable output swing; isolates filter from load variations and adds clamp protection. Use Value: Maintains 670 MHz large-signal bandwidth and −78 dB HD3 at 70 MHz, ensuring minimal in-band distortion in multi-carrier LTE signals. |
| Video Over Twisted Pair | Automotive Safety Imaging |
Use Scenario: Transmitting uncompressed HD video (1080p60) over 100 m CAT5e cable using differential signaling. IC Role / Device Role / Timing Role: Single-ended-to-differential converter and line driver; converts camera output to robust balanced format. Use Value: 900 MHz small-signal bandwidth supports >150 MHz video harmonics; 10 ns settling ensures pixel clock edge integrity. | Use Scenario: Conditioning analog outputs from a 3D time-of-flight (ToF) image sensor in an automotive ADAS camera module. IC Role / Device Role / Timing Role: Low-noise, clamped differential driver for ToF demodulator outputs feeding a high-speed ADC. Use Value: 1.2 nV/√Hz input noise preserves weak return-signal SNR; −40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IRGET | Lower small-signal BW (550 MHz), no integrated clamp, lower supply current (15.5 mA) | Lacks output limiting; requires external protection for ADC input safety | Preferred where power efficiency and cost are prioritized over transient robustness |
| LMH5401RTVT | Higher BW (4 GHz), fixed internal clamp, higher supply current (42 mA), only available in WQFN | Designed for >1 GSPS ADCs; clamp not adjustable; less flexible common-mode control | Selected when ultra-wideband performance is mandatory and layout allows WQFN thermal management |
Compared with THS4561IRGET and LMH5401RTVT, the LMH6553MR/NOPB uniquely balances 900 MHz bandwidth, user-adjustable clamping, and SO PowerPAD thermal reliability-making it optimal for mid-speed, safety-critical ADC interfaces where overvoltage resilience cannot be compromised.
Availability
LMH6553MR/NOPB is available at Aetrix Electronics and suitable for high-speed data acquisition, RF instrumentation, and automotive imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMH6553MR/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 decades of expertise in high-speed amplifier design and manufacturing.
The LMH™ high-speed amplifier family, including the LMH6553MR/NOPB, was engineered specifically for precision signal conditioning in demanding data converter interfaces, emphasizing bandwidth, linearity, and robustness in real-world system environments.
FAQ
What is the maximum recommended supply voltage for the LMH6553MR/NOPB?
The absolute maximum supply voltage for the LMH6553MR/NOPB is ±6.6 V (13.2 V total), but the recommended operating range is ±2.5 V to ±6 V. Operation at ±6 V enables maximum output swing and bandwidth, while lower supplies (e.g., ±2.5 V) reduce power consumption and thermal load. Exceeding ±6 V risks permanent damage per TI's Absolute Maximum Ratings table.
How does the VCLAMP pin function in the LMH6553MR/NOPB?
The VCLAMP pin on the LMH6553MR/NOPB sets the upper and lower voltage limits for the differential output pair. When driven with a DC voltage (0.42 V to 3.0 V), it defines symmetrical clamping thresholds around the output common-mode level set by VCM. For example, with VCM = 1.5 V and VCLAMP = 2.0 V, the outputs clamp at approximately 1.5 V ± 0.5 V. This protects downstream ADCs without requiring external components.
Can the LMH6553MR/NOPB drive a 100 Ω differential load directly?
Yes, the LMH6553MR/NOPB is specified for RL = 200 Ω differential (i.e., 100 Ω per leg to ground), delivering full performance including 670 MHz large-signal bandwidth and −92 dB IMD3. Driving a true 100 Ω differential load (50 Ω per leg) is possible but requires external series resistors (e.g., 25 Ω per output) to maintain stability and avoid excessive current draw beyond its ±120 mA linear output rating.
What is the purpose of the DAP (Die Attach Pad) on the LMH6553MR/NOPB SO PowerPAD package?
The DAP on the LMH6553MR/NOPB is an exposed thermal pad on the underside of the SOIC-8 package. It must be soldered to a PCB copper pour to achieve the specified θJA of 59°C/W. Without proper DAP connection, junction temperature rises significantly-reducing reliability, bandwidth, and distortion performance. TI recommends a 6 × 6 array of thermal vias under the DAP connected to an internal ground plane.
Does the LMH6553MR/NOPB support single-ended input configurations?
Yes, the LMH6553MR/NOPB supports single-ended input operation via configuration shown in Figure 1 of the datasheet: +IN receives the signal, −IN is grounded or biased, and gain is set by RF/RG resistor network. Performance remains excellent-900 MHz small-signal bandwidth and −79 dB THD are specified under single-ended input conditions-and the internal common-mode feedback maintains output balance without external compensation.
LMH6553MR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®, PowerWise®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 2300V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 900 MHz
- Current - Input Bias:
- 50 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 29.1mA
- Current - Output / Channel:
- 120 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMH6553MR/NOPB FAQ
1.How can I place an order for LMH6553MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6553MR/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 LMH6553MR/NOPB reliable?
The price and inventory of LMH6553MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6553MR/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6553MR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6553MR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6553MR/NOPB?
LMH6553MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6553MR/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 LMH6553MR/NOPB?
For technical support, including LMH6553MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6553MR/NOPB requirements.
6.How does Aetrix verify that LMH6553MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6553MR/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 LMH6553MR/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6553MR/NOPB?
All LMH6553MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6553MR/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 LMH6553MR/NOPB part is unused and in its original packaging.
Return procedure for LMH6553MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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