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Texas Instruments LMH6553MRX/NOPB
- Part No.:
- LMH6553MRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6553MRX/NOPB.pdf
- Description:
- IC OPAMP CFA 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:1,171
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Product details
Overview
LMH6553MRX/NOPB from Texas Instruments is a 900 MHz fully differential amplifier with integrated adjustable output limiting clamp, designed as a high-speed ADC driver for 8–14-bit converters. It delivers −79 dB THD at 20 MHz, 10 ns 0.1% settling time, and 600 ps clamp overdrive recovery, enabling robust protection of downstream analog-to-digital converters in RF receiver front-ends and instrumentation systems.
For engineers reviewing the LMH6553MRX/NOPB datasheet, LMH6553MRX/NOPB pinout, LMH6553MRX/NOPB application, or LMH6553MRX/NOPB equivalent, key selection considerations include its differential output limiting capability, ±5 V supply operation, 8-pin SO PowerPAD package thermal performance (59°C/W), and verified use in single-ended-to-differential conversion with external gain resistors.
Technical Context
The LMH6553MRX/NOPB employs a fully differential current-feedback architecture with independent common-mode feedback loop (VCM pin) and dedicated clamp control (VCLAMP pin). Its internal clamp circuit operates independently of signal path gain configuration and maintains accuracy within ±40 mV at 100% overdrive across temperature.
It supports both AC- and DC-coupled inputs, configurable as single-ended-to-differential or differential-to-differential via external RF/RG resistors (e.g., 275 Ω for unity gain). The amplifier's 670 MHz large-signal bandwidth and 2300 V/μs slew rate ensure fidelity for fast transient signals up to 2 VPP without distortion-induced clipping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal BW | 900 MHz @ AV = 1, RL = 1 kΩ - enables wideband IF/RF signal conditioning up to UHF. |
| Large Signal BW | 670 MHz @ 2 VPP, AV = 1 - preserves pulse integrity for high-dynamic-range ADC sampling. |
| THD | −79 dB @ 20 MHz - meets SFDR requirements for 12–14-bit ADC drivers in communications systems. |
| Clamp Recovery | 600 ps - ensures rapid resumption of linear operation after overvoltage events, critical for burst-mode receivers. |
| Supply Range | ±2.5 V to ±6 V (4.5–12 V total) - supports low-voltage portable designs and higher-voltage industrial signal chains. |
| Input CMVR | ±3.6 V @ VS = ±5 V - accommodates wide common-mode input swings in DC-coupled baseband applications. |
| Output Swing | 5.47 VPP differential - drives 200 Ω loads directly into ADC inputs without external level-shifting. |
Pinout & Package
LMH6553MRX/NOPB is packaged in an 8-pin SO PowerPAD (SOIC-8 with exposed thermal pad), optimized for thermal dissipation (θJA = 59°C/W) in high-speed amplifier applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Negative Input | Inverting input node for differential or single-ended configurations; requires matched layout to +IN. |
| 2: VCM | Output Common-Mode Control | Sets DC common-mode voltage of differential outputs; must be driven with low-impedance source. |
| 3: V+ | Positive Supply | Connects to positive rail (up to +6 V); decoupling capacitor required near pin. |
| 4: +OUT | Positive Output | Differential output terminal; routed differentially with −OUT to maintain balance and minimize EMI. |
| 5: −OUT | Negative Output | Complementary differential output; pair with +OUT for balanced drive to ADC inputs. |
| 6: V− | Negative Supply | Connects to negative rail (down to −6 V); separate ground plane recommended for noise isolation. |
| 7: VCLAMP | Output Clamp Voltage Control | Analog input setting upper/lower clamp thresholds; floating default = 1.0 V (±0.08 V). |
| 8: +IN | Positive Input | Non-inverting input node; forms differential pair with −IN; input capacitance = 0.5 pF. |
| DAP | Die Attach Pad | Internally connected to V−; must be soldered to PCB ground plane for thermal and electrical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Clamp | Adjustable clamping with ±40 mV accuracy at 100% overdrive eliminates need for external diode networks. |
| Fast Overdrive Recovery | 600 ps recovery time prevents dead-time artifacts in time-critical sampling systems like LIDAR or pulsed radar. |
| DC-Coupled Operation | Supports baseband signal conditioning with full input common-mode range (±3.6 V @ ±5 V supply). |
| Low Distortion at High Frequency | −92 dB IMD3 @ 20 MHz enables clean multi-tone signal handling in wideband communication receivers. |
| Thermally Optimized Package | SO PowerPAD reduces junction-to-board thermal resistance by >30% vs. standard SOIC-8, sustaining 29.1 mA supply current at full bandwidth. |
Applications
| Differential ADC Driver | Video Over Twisted Pair |
|---|---|
Use Scenario: Driving 12-bit, 105 MSPS ADC in a software-defined radio receiver front-end with variable IF frequency from 10–150 MHz. IC Role / Device Role / Timing Role: Fully differential signal conditioner and overload protector; provides precise common-mode bias and clamped output swing matching ADC input range. Use Value: Prevents ADC saturation during strong interferer bursts while maintaining −79 dB THD for adjacent-channel rejection compliance. |
Use Scenario: Transmitting HD video (720p60) over 100 m CAT5e cable in broadcast production equipment. IC Role / Device Role / Timing Role: Differential line driver with adjustable output amplitude and common-mode control for impedance-matched transmission. Use Value: Enables >600 MHz small-signal bandwidth to preserve edge fidelity and 10 ns settling for pixel clock alignment. |
| Single-Ended to Differential Converter | IF/RF Amplifier |
Use Scenario: Converting single-ended SAW filter output to differential input for a 14-bit, 125 MSPS ADC in a cellular base station transceiver. IC Role / Device Role / Timing Role: Gain block with external RF/RG resistors (275 Ω) configured for 2× differential gain and VCM-controlled output offset. Use Value: Achieves −92 dB IMD3 at 20 MHz, meeting ACLR requirements for LTE FDD uplink signal paths. |
Use Scenario: Intermediate-frequency amplification stage in a 5G mmWave test instrument with 100–300 MHz IF bandwidth. IC Role / Device Role / Timing Role: Wideband, low-noise gain stage with 1.2 nV/√Hz input voltage noise and 670 MHz large-signal bandwidth. Use Value: Maintains SNR > 72 dB across 200 MHz span while providing 600 ps clamp recovery for transient suppression. |
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 bandwidth (550 MHz SS BW), no integrated clamp, 1.8 nV/√Hz noise | Lacks output limiting; requires external protection for ADC overvoltage scenarios | Preferred when ultra-low noise dominates over transient protection needs |
| ADA4940-1ACPZ-R7 | Higher precision (0.3 mV VOS), lower THD (−85 dB @ 10 MHz), but 420 MHz SS BW | Better DC accuracy and harmonic performance, but insufficient bandwidth for >100 MHz IF signals | Selected for precision DC-coupled sensor interfaces where bandwidth < 50 MHz suffices |
Compared with THS4561IRGET and ADA4940-1ACPZ-R7, the LMH6553MRX/NOPB uniquely combines 900 MHz bandwidth, integrated clamp, and 600 ps recovery-making it irreplaceable in burst-mode, wideband ADC driver roles where both speed and overload resilience are mandatory.
Availability
LMH6553MRX/NOPB is available at Aetrix Electronics and suitable for high-speed data acquisition, RF instrumentation, and automotive ADAS sensor signal conditioning requiring stable component supply and long-term production continuity.
Supply support for LMH6553MRX/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, with over 90 years of innovation in high-performance amplifier design and manufacturing.
The LMH6553MRX/NOPB belongs to TI's LMH™ high-speed amplifier family, engineered specifically for demanding signal chain applications including ADC driving, RF/IF amplification, and high-fidelity video transmission.
FAQ
What is the maximum continuous VCLAMP voltage for safe operation of LMH6553MRX/NOPB?
The LMH6553MRX/NOPB specifies VCLAMP = 3 V as a peak condition-not for continuous operation. Continuous VCLAMP must remain ≤2.0 V to avoid permanent device damage. At ±5 V supply, the recommended continuous clamp range is VCM + 2.0 V (upper) and VCM − 2.0 V (lower), with default floating VCLAMP = 1.0 V ±0.08 V. Always verify clamp voltage against actual VCM and load conditions in final design.
Can LMH6553MRX/NOPB operate with a single 5 V supply?
Yes, LMH6553MRX/NOPB supports single-supply operation down to +2.5 V and up to +12 V total supply. For 5 V single supply, connect V− to ground and V+ to +5 V. Input common-mode range becomes 0 V to +2.5 V (not ±3.6 V), and output swing reduces to 5.47 VPP differential into 200 Ω. Performance remains validated per VS = ±2.5 V electrical characteristics table in the datasheet.
How does the DAP (Die Attach Pad) on LMH6553MRX/NOPB function electrically and thermally?
The DAP on LMH6553MRX/NOPB is internally connected to the V− pin and serves dual purposes: it provides a low-inductance path to ground for high-frequency return currents and enhances thermal conduction from die to PCB. TI specifies minimum 4×4 mm² copper pour under DAP, soldered with ≥70% coverage. Failure to connect DAP results in elevated junction temperature (>150°C) and degraded distortion performance beyond datasheet limits.
What is the impact of VCM pin impedance on LMH6553MRX/NOPB output common-mode error?
LMH6553MRX/NOPB requires VCM to be driven with ≤100 Ω source impedance. Higher impedance causes >25 mV VOSCM error due to input bias current (±95 µA) flowing through series resistance. At 25°C, typical VOSCM = ±1 mV with ideal low-Z drive; with 1 kΩ source, error exceeds ±95 mV-degrading ADC effective resolution. Use op-amp buffer or dedicated VCM reference IC for production designs.
Does LMH6553MRX/NOPB support DC-coupled inputs with rail-to-rail common-mode range?
LMH6553MRX/NOPB supports true DC-coupled operation but does not offer rail-to-rail input common-mode range. At ±5 V supply, the valid CMVR is ±3.6 V (−3.6 V to +3.6 V), limited by internal transistor headroom. Inputs outside this range cause CMRR degradation and increased distortion. For signals exceeding ±3.6 V, add external attenuation or level-shifting prior to LMH6553MRX/NOPB input pins.
LMH6553MRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®, PowerWise®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LMH6553MRX/NOPB FAQ
1.How can I place an order for LMH6553MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6553MRX/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 LMH6553MRX/NOPB reliable?
The price and inventory of LMH6553MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6553MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6553MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6553MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6553MRX/NOPB?
LMH6553MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6553MRX/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 LMH6553MRX/NOPB?
For technical support, including LMH6553MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6553MRX/NOPB requirements.
6.How does Aetrix verify that LMH6553MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6553MRX/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 LMH6553MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6553MRX/NOPB?
All LMH6553MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6553MRX/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 LMH6553MRX/NOPB part is unused and in its original packaging.
Return procedure for LMH6553MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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