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Texas Instruments LMH6881SQX/NOPB
- Part No.:
- LMH6881SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMH6881SQX/NOPB.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
LMH6881SQX/NOPB from Texas Instruments is a DC–2.4 GHz programmable differential amplifier optimized for high-linearity signal conditioning in RF/IF and high-speed data acquisition systems. It delivers 26 dB to 6 dB voltage gain in 0.25 dB steps, 44 dBm OIP3 at 100 MHz, 9.7 dB noise figure, and 100 Ω differential input impedance - enabling direct interface with mixers, filters, and differential ADCs in oscilloscope front ends and spectrum analyzer gain blocks.
For engineers reviewing the LMH6881SQX/NOPB datasheet, LMH6881SQX/NOPB pinout, LMH6881SQX/NOPB application, or LMH6881SQX/NOPB equivalent, key selection criteria include its digitally programmable gain architecture (SPI/parallel), dual-input support (differential and single-ended), shutdown capability, thermal performance in WQFN-24, and verified linearity across full gain range without external resistors.
Technical Context
The LMH6881SQX/NOPB integrates three functional stages: a low-noise amplifier, a digitally controlled attenuator, and a low-distortion output driver. Its gain control path supports both parallel (2 dB steps) and SPI-compatible serial (0.25 dB steps) interfaces, with independent shutdown via SD pin and configurable output common-mode voltage via OCM pin (gain = 2).
It operates from a single 4.75 V–5.25 V supply, draws 100–135 mA quiescent current, and maintains stable OIP3 (>42 dBm) and HD3 (<−76 dBc) up to 200 MHz. Input impedance is 100 Ω differential or 50 Ω single-ended; output impedance is <0.5 Ω differential, supporting direct drive into 200 Ω loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal Bandwidth | 2.4 GHz - enables baseband-to-RF signal conditioning without bandwidth limitation in IF/RF gain blocks. |
| OIP3 @ 100 MHz | 44 dBm - ensures high dynamic range in multi-tone applications like spectrum analysis and cable drivers. |
| Voltage Gain Range | 6 dB to 26 dB - covers wide signal-level scaling needs while maintaining linearity across entire range. |
| Gain Step Size | 0.25 dB (SPI), 2 dB (parallel) - supports precise AGC tuning and fixed-gain solder-down configurations. |
| Noise Figure | 9.7 dB @ 100 Ω source - minimizes system noise contribution when driving high-resolution ADCs. |
| Input Impedance | 100 Ω differential / 50 Ω single-ended - simplifies matching to RF components and eliminates external termination resistors. |
| Supply Voltage | 4.75 V–5.25 V - compatible with standard 5 V rails and tolerant of typical board-level regulation variation. |
Pinout & Package
The LMH6881SQX/NOPB is housed in a thermally enhanced 24-pin WQFN package (4.00 mm × 4.00 mm) with exposed thermal pad bonded to ground. Pin layout supports high-frequency layout integrity: four VCC pins (19, 20, 23, 24), four GND pins (6, 7, 12, 13), and symmetric differential I/O routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPD / INMD | Differential analog input | 100 Ω matched pair for balanced signal injection; no external termination required. |
| INPS / INMS | Single-ended analog input | 50 Ω inputs accepting unbalanced sources; unused pin must be terminated to 50 Ω. |
| OUTP / OUTM | Differential analog output | Low-impedance (0.4 Ω) outputs drive 200 Ω differential loads directly. |
| OCM | Output common-mode control | Gain-of-2 input sets output DC common-mode; 1.25 V yields 2.5 V VOCM. |
| D0–D3 / SPI / SD | Digital control interface | Parallel gain (D0–D3), mode select (SPI), and shutdown (SD) enable flexible system integration. |
| VCC / GND | Power and ground | Four dedicated VCC and four GND pins minimize supply inductance and improve PSRR at RF frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gain without external resistors | Eliminates gain-setting components and layout iterations; one BOM item covers multiple gain requirements. |
| DC-coupled differential architecture | Supports baseband and RF signals down to 0 Hz - essential for medical imaging and precision instrumentation. |
| Parallel + SPI digital control | Enables both fixed-gain solder-down (no controller needed) and dynamic AGC (via microcontroller SPI bus). |
| Thermally enhanced WQFN-24 | θJA = 38.1°C/W and exposed pad reduce junction temperature rise under continuous RF output conditions. |
| Shutdown mode (15 mA ICC) | Reduces power by >85% during idle periods - critical for battery-powered test equipment and portable analyzers. |
Applications
| Oscilloscope Front End | Spectrum Analyzer Gain Block |
|---|---|
|
Use Scenario: Amplifying low-amplitude, wideband signals from probe tips or passive dividers before digitization. IC Role / Device Role / Timing Role: Programmable gain stage providing adjustable signal scaling and 2.4 GHz bandwidth to preserve fast edge fidelity. Use Value: Enables single hardware design to support multiple vertical sensitivity ranges without changing gain resistors or layout. |
Use Scenario: Boosting weak RF signals prior to mixing and FFT processing in real-time spectrum analysis. IC Role / Device Role / Timing Role: High-OIP3, low-NF gain block maintaining signal integrity across multi-MHz instantaneous bandwidths. Use Value: Delivers >44 dBm OIP3 at 100 MHz to suppress intermodulation distortion in crowded RF environments. |
| Differential ADC Driver | Medical Imaging Signal Chain |
|
Use Scenario: Driving high-resolution, low-noise differential ADCs (e.g., 16+ bit, >100 MSPS) in data acquisition systems. IC Role / Device Role / Timing Role: Low-output-impedance, DC-coupled buffer delivering clean, balanced signals with minimal THD. Use Value: Achieves −76 dBc HD3 at 200 MHz, preserving ENOB in ultrasound and MRI front-end digitization. |
Use Scenario: Conditioning analog outputs from ultrasound transducer arrays or MRI gradient amplifiers. IC Role / Device Role / Timing Role: Wideband, low-phase-error amplifier supporting coherent beamforming and time-of-flight measurements. Use Value: Maintains ±0.125 dB gain step accuracy and ±3° phase shift across 20 dB range for precise channel matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6882RTWT | Dual-channel version in same WQFN-24 package; shares identical gain range, OIP3, and interface logic. | Used where two synchronized, matched gain paths are required (e.g., I/Q signal chains). | Select LMH6882RTWT only when dual-channel correlation or space-constrained dual-path design is mandatory. |
| ADL5562ACPZ-R7 | Fixed-gain (16 dB) differential amplifier; higher NF (7.8 dB) but wider bandwidth (4.3 GHz); no digital gain control. | Suitable for fixed-gain, ultra-wideband applications where programmability is unnecessary. | Choose ADL5562ACPZ-R7 only for non-programmable, maximum-bandwidth use cases with tighter noise budget. |
Compared with LMH6881SQX/NOPB, LMH6882RTWT offers channel pairing at identical per-channel performance, while ADL5562ACPZ-R7 trades programmability for higher bandwidth and lower noise - making LMH6881SQX/NOPB optimal for flexible, multi-gain RF signal chains requiring DC coupling and fine-step control.
Availability
LMH6881SQX/NOPB is available at Aetrix Electronics and suitable for oscilloscope front ends, spectrum analyzer gain blocks, and differential ADC driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and test equipment OEMs.
Supply support for LMH6881SQX/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, embedded processing, and high-performance signal chain solutions for industrial, automotive, and communications markets.
The LMH6881SQX/NOPB belongs to TI's high-speed differential amplifier product line, designed specifically for programmable, wideband signal conditioning in RF test equipment, medical imaging, and high-fidelity data acquisition systems.
FAQ
What is the operating supply voltage range for the LMH6881SQX/NOPB?
The LMH6881SQX/NOPB operates from a single 4.75 V to 5.25 V supply. This 5 V nominal range ensures compatibility with standard logic rails and accommodates typical board-level regulation tolerance. Operation outside this range risks violating absolute maximum ratings and may cause permanent damage or degraded linearity performance.
Does the LMH6881SQX/NOPB support both differential and single-ended input configurations?
Yes, the LMH6881SQX/NOPB supports both configurations: differential inputs (INPD/INMD, 100 Ω) and single-ended inputs (INPS/INMS, 50 Ω). When using single-ended mode, the unused input must be terminated to 50 Ω to maintain balance and prevent CMRR degradation. The device does not require external resistors in either configuration.
How does the OCM pin function on the LMH6881SQX/NOPB?
The OCM pin on the LMH6881SQX/NOPB sets the output common-mode voltage with a gain of 2. Applying 1.25 V to OCM produces a 2.5 V output common-mode level, matching typical ADC reference midpoints. This allows precise DC bias control without external feedback networks, supporting both AC- and DC-coupled system architectures.
What is the minimum and maximum voltage gain achievable with the LMH6881SQX/NOPB?
The LMH6881SQX/NOPB provides a voltage gain range of 6 dB to 26 dB. In parallel mode, gain is set in 2 dB increments using D0–D3; in SPI mode, it supports 0.25 dB steps across the full range. Gain step error is ±0.125 dB, and phase shift between adjacent steps is ±3°, ensuring predictable signal path behavior.
Can the LMH6881SQX/NOPB be used in DC-coupled applications?
Yes, the LMH6881SQX/NOPB is fully DC-coupled and supports baseband operation from 0 Hz. Its self-biased input common-mode voltage (2.5 V) and programmable OCM output allow seamless integration into DC-coupled signal chains such as medical imaging front ends and precision instrumentation, without blocking capacitors or level-shifting circuitry.
LMH6881SQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2.4 GHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 100mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 80°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LMH6881SQX/NOPB FAQ
1.How can I place an order for LMH6881SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6881SQX/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 LMH6881SQX/NOPB reliable?
The price and inventory of LMH6881SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6881SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6881SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6881SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6881SQX/NOPB?
LMH6881SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6881SQX/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 LMH6881SQX/NOPB?
For technical support, including LMH6881SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6881SQX/NOPB requirements.
6.How does Aetrix verify that LMH6881SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6881SQX/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 LMH6881SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6881SQX/NOPB?
All LMH6881SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6881SQX/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 LMH6881SQX/NOPB part is unused and in its original packaging.
Return procedure for LMH6881SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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