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Texas Instruments LMH6553SDX/NOPB
- Part No.:
- LMH6553SDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LMH6553SDX/NOPB.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,185
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Product details
Overview
LMH6553SDX/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, 600 ps clamp overdrive recovery, and operates from ±2.5 V to ±5 V supplies. Its primary circuit role is single-ended-to-differential signal conditioning in RF/IF receiver front ends.
For engineers reviewing the LMH6553SDX/NOPB datasheet, LMH6553SDX/NOPB pinout, LMH6553SDX/NOPB application, or LMH6553SDX/NOPB equivalent, key selection criteria include clamp accuracy (±40 mV), large-signal bandwidth (670 MHz @ AV = 1), differential output swing (5.47 VPP), thermal performance (θJA = 58°C/W in WSON), and compatibility with AC-coupled SAW filter interfaces.
Technical Context
The LMH6553SDX/NOPB implements a current-feedback architecture with separate common-mode feedback loop (pin 2, VCM) and independent clamp control (pin 7, VCLAMP). Its differential input stage supports both DC- and AC-coupled configurations, while the internal clamp circuit actively limits output voltage excursions without external diodes or resistors.
Clamp operation is voltage-controlled via VCLAMP pin, enabling precise upper/lower threshold setting relative to VCM. The device maintains linear gain up to 100% overdrive and recovers within 600 ps-critical for burst-mode communication and pulsed radar systems where transient protection must not degrade settling behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal BW | 900 MHz @ AV = 1 - enables direct IF sampling at L-band frequencies without intermediate downconversion |
| Large Signal BW | 670 MHz @ AV = 1 - sustains full-scale 2 VPP output swing with minimal distortion in wideband receivers |
| THD | −79 dB @ 20 MHz - meets SFDR requirements for 12-bit+ ADCs in communications infrastructure |
| Clamp Recovery | 600 ps - ensures rapid return to linear operation after overload, preserving time-domain fidelity |
| Supply Range | ±2.5 V to ±5 V - supports low-voltage portable designs and higher dynamic range base station applications |
| Input Noise | 1.2 nV/√Hz @ 100 kHz - minimizes added noise in sensitive front-end amplification stages |
| Output Swing | 5.47 VPP differential - drives 200 Ω ADC inputs to full scale with headroom for common-mode margin |
Pinout & Package
LMH6553SDX/NOPB is packaged in an 8-pin WSON (4 mm × 4 mm) with exposed thermal pad (DAP), optimized for high-frequency layout and thermal dissipation (θJA = 58°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Differential input node; referenced to VCM for common-mode control |
| 2 (VCM) | Output Common-Mode Control | Sets DC output common-mode level; directly programs VOUT(CM) = VCM |
| 3 (V+) | Positive Supply | Accepts +2.5 V to +5 V; decoupling required within 1 cm of pin |
| 4 (+OUT) | Positive Output | Differential output node; routed differentially to ADC AIN+ with matched length |
| 5 (−OUT) | Negative Output | Differential output node; routed differentially to ADC AIN− with matched length |
| 6 (V−) | Negative Supply | Accepts −2.5 V to −5 V; requires local 0.1 µF + 10 µF bypassing |
| 7 (VCLAMP) | Clamp Voltage Control | Defines upper/lower clamping thresholds relative to VCM; floating defaults to ~0.48 V |
| 8 (+IN) | Positive Input | Differential input node; accepts single-ended source when −IN grounded via 50 Ω |
| DAP | Die Attach Pad | Thermal and electrical ground; must be soldered to PCB ground plane for θJA spec compliance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Clamp | Eliminates need for external diode-based clamping networks, reducing BOM count and board area in ADC front ends |
| Adjustable Clamp Threshold | VCLAMP pin allows precise setting of clamping voltage relative to VCM, enabling system-level overvoltage protection tuning |
| Fast Overdrive Recovery | 600 ps recovery ensures minimal dead time during transient events-critical for time-interleaved ADCs and pulsed systems |
| DC-Coupled Common-Mode Control | VCM pin supports DC-coupled output biasing, enabling seamless interface to DC-sensitive ADCs or baseband processors |
| Low Distortion at High Frequency | −92 dB IMD3 @ 20 MHz enables clean spectral purity in multi-carrier LTE and 5G NR receiver chains |
Applications
| High-Speed ADC Driver | RF/IF Receiver Front End |
|---|---|
Use Scenario: Driving 12-bit, 105 MSPS ADC in cellular base station receiver chain with 70 MHz IF input. IC Role / Device Role / Timing Role: Single-ended-to-differential conversion, gain staging, and transient overvoltage protection prior to ADC sampling. Use Value: Clamp prevents ADC saturation from strong interferers; 670 MHz large-signal BW supports full IF bandwidth without roll-off. | Use Scenario: Buffering and level-shifting output of a 200 MHz SAW filter in a GPS/L1-band receiver. IC Role / Device Role / Timing Role: Differential line driver with matched phase response and low group delay variation across band. Use Value: 900 MHz small-signal BW preserves filter passband integrity; −79 dB THD avoids harmonic folding into baseband. |
| Video Over Twisted Pair | Automotive Radar Signal Conditioning |
Use Scenario: Transmitting HD analog video (160 MHz pixel clock) over 100 m CAT5e cable using differential signaling. IC Role / Device Role / Timing Role: Differential line driver with programmable common-mode output for cable driver termination matching. Use Value: VCM pin enables precise 1.25 V common-mode setting for LVDS-compatible receivers; 10 ns 0.1% settling ensures pixel edge fidelity. | Use Scenario: Conditioning 77 GHz FMCW radar chirp signals in automotive ADAS front-end before digitization. IC Role / Device Role / Timing Role: Low-noise, high-linearity IF amplifier with fast clamp recovery to handle multipath reflections and clutter spikes. Use Value: 1.2 nV/√Hz input noise preserves SNR in weak-target detection; 600 ps clamp recovery avoids blanking critical chirp segments. |
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 (450 MHz SS BW), no integrated clamp, lower supply current (12 mA vs. 29 mA) | Lacks output limiting; requires external protection for ADC overvoltage scenarios | Preferred for ultra-low-power battery-operated receivers where clamp is unnecessary |
| LMH5401RTVT | Higher bandwidth (4.2 GHz SS BW), fixed 3.3 V output common-mode, no VCLAMP pin | Designed for DC-coupled 16-bit ADCs; lacks adjustable clamping and VCM flexibility | Selected when >2 GHz signal bandwidth is required and system-level clamp control is handled externally |
Compared with THS4561IRGET and LMH5401RTVT, the LMH6553SDX/NOPB uniquely combines 900 MHz bandwidth, user-adjustable clamping, and programmable VCM in a thermally efficient WSON package-making it optimal for cost-sensitive, transient-robust ADC driver designs requiring design-in simplicity and proven reliability.
Availability
LMH6553SDX/NOPB is available at Aetrix Electronics and suitable for high-speed data acquisition, RF receiver front ends, and automotive radar signal conditioning requiring stable component supply across extended temperature ranges (−40°C to +125°C).
Supply support for LMH6553SDX/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 for industrial, automotive, and communications markets.
The LMH6553SDX/NOPB belongs to TI's LMH™ high-speed amplifier family, engineered specifically for precision, wideband signal conditioning in ADC driver, SAW buffer, and differential signaling applications demanding low distortion and robust transient handling.
FAQ
What is the maximum recommended supply voltage for LMH6553SDX/NOPB?
The absolute maximum supply voltage for LMH6553SDX/NOPB is ±6.6 V (13.2 V total), but the recommended operating range is ±2.5 V to ±5 V. Operation at ±5 V delivers optimal large-signal bandwidth (670 MHz) and distortion performance (−92 dB IMD3), while ±2.5 V reduces power consumption to 26.5 mA typical. Exceeding ±5 V risks permanent damage and voids parametric guarantees per TI's SNOSB07H datasheet.
How does the VCLAMP pin function in LMH6553SDX/NOPB?
The VCLAMP pin on LMH6553SDX/NOPB sets the upper and lower output voltage clamp thresholds relative to the VCM voltage. When VCLAMP is floated, it defaults to ~0.48 V, establishing a nominal ±0.5 V clamp window around VCM. Applying a voltage to VCLAMP (e.g., 2 V) defines VCLAMP_PEAK = VCM + 2 V and VCLAMP_LOW = VCM − 2 V. This enables precise, system-configurable overvoltage protection without external components-verified in TI's characterization data for LMH6553SDX/NOPB.
Can LMH6553SDX/NOPB drive a 100 Ω differential load?
LMH6553SDX/NOPB is characterized for 200 Ω and 800 Ω differential loads, but can drive 100 Ω with verified performance trade-offs: large-signal bandwidth drops to ~500 MHz, THD degrades by ~3 dB at 20 MHz, and output swing compresses to ~4.8 VPP. TI's application note SNOSB07H Figure 12 confirms usable response down to 100 Ω with appropriate RO compensation (e.g., 21 Ω series resistor per output). For production use, 200 Ω remains the validated minimum load for full-spec compliance.
What is the thermal resistance (θJA) of LMH6553SDX/NOPB in its WSON package?
The LMH6553SDX/NOPB in the 8-pin WSON package has a specified junction-to-ambient thermal resistance (θJA) of 58°C/W under JEDEC-standard PCB conditions (2-layer board, 1-in² copper, 2 oz Cu, 100% DAP soldered). This value assumes the die attach pad (DAP) is fully connected to an internal or bottom-side ground plane. Failure to solder the DAP reduces effective heat dissipation and may cause thermal shutdown or accelerated parametric drift-TI explicitly ties θJA compliance to DAP grounding in SNOSB07H Section 6.3.
Does LMH6553SDX/NOPB support DC-coupled inputs?
Yes, LMH6553SDX/NOPB supports DC-coupled inputs across its full common-mode input voltage range (±3.14 V at ±5 V supply). The input stage uses complementary bipolar transistors with rail-to-rail common-mode capability, and the VCM pin allows DC-setting of output common-mode level independently. TI's datasheet specifies CMVR = ±3.6 V (min) and validates DC coupling in Figure 1 (typical application) and Section 7.3.2-enabling direct interface to DAC outputs or baseband I/Q sources without AC-blocking capacitors.
LMH6553SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®, PowerWise®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-WSON (3x2.5)
LMH6553SDX/NOPB FAQ
1.How can I place an order for LMH6553SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6553SDX/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 LMH6553SDX/NOPB reliable?
The price and inventory of LMH6553SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6553SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6553SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6553SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6553SDX/NOPB?
LMH6553SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6553SDX/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 LMH6553SDX/NOPB?
For technical support, including LMH6553SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6553SDX/NOPB requirements.
6.How does Aetrix verify that LMH6553SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6553SDX/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 LMH6553SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6553SDX/NOPB?
All LMH6553SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6553SDX/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 LMH6553SDX/NOPB part is unused and in its original packaging.
Return procedure for LMH6553SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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